/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.activiti.editor.language.json.converter;

import java.text.DateFormat;
import java.text.SimpleDateFormat;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

import math.geom2d.Point2D;

import math.geom2d.conic.Circle2D;

import math.geom2d.curve.AbstractContinuousCurve2D;

import math.geom2d.line.Line2D;

import math.geom2d.polygon.Polyline2D;

import org.activiti.bpmn.model.Activity;
import org.activiti.bpmn.model.Artifact;
import org.activiti.bpmn.model.BaseElement;
import org.activiti.bpmn.model.BoundaryEvent;
import org.activiti.bpmn.model.BpmnModel;
import org.activiti.bpmn.model.Event;
import org.activiti.bpmn.model.EventDefinition;
import org.activiti.bpmn.model.ExtensionElement;
import org.activiti.bpmn.model.FlowElement;
import org.activiti.bpmn.model.FlowElementsContainer;
import org.activiti.bpmn.model.FlowNode;
import org.activiti.bpmn.model.Gateway;
import org.activiti.bpmn.model.GraphicInfo;
import org.activiti.bpmn.model.Lane;
import org.activiti.bpmn.model.Message;
import org.activiti.bpmn.model.MessageEventDefinition;
import org.activiti.bpmn.model.MessageFlow;
import org.activiti.bpmn.model.Pool;
import org.activiti.bpmn.model.Process;
import org.activiti.bpmn.model.SequenceFlow;
import org.activiti.bpmn.model.Signal;
import org.activiti.bpmn.model.SignalEventDefinition;
import org.activiti.bpmn.model.SubProcess;
import org.activiti.bpmn.model.ValuedDataObject;

import org.activiti.editor.constants.EditorJsonConstants;
import org.activiti.editor.constants.StencilConstants;
import org.activiti.editor.language.json.converter.util.JsonConverterUtil;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.lang3.StringUtils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Tijs Rademakers
 */
public class BpmnJsonConverter implements EditorJsonConstants,
        StencilConstants, ActivityProcessor {
    protected static final Logger LOGGER = LoggerFactory
            .getLogger(BpmnJsonConverter.class);
    protected static Map<Class<? extends BaseElement>, Class<? extends BaseBpmnJsonConverter>> convertersToJsonMap = new HashMap<Class<? extends BaseElement>, Class<? extends BaseBpmnJsonConverter>>();
    protected static Map<String, Class<? extends BaseBpmnJsonConverter>> convertersToBpmnMap = new HashMap<String, Class<? extends BaseBpmnJsonConverter>>();
    public static final String MODELER_NAMESPACE = "http://activiti.com/modeler";
    protected static final DateFormat defaultFormat = new SimpleDateFormat(
            "yyyyMMddHHmmss");
    protected static final DateFormat entFormat = new SimpleDateFormat(
            "yyyyMMddHHmmssSSS");

    static {
        // start and end events
        StartEventJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        EndEventJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);

        // connectors
        SequenceFlowJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        MessageFlowJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        AssociationJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);

        // task types
        BusinessRuleTaskJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        MailTaskJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        ManualTaskJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        ReceiveTaskJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        ScriptTaskJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        ServiceTaskJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        UserTaskJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        CallActivityJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        CamelTaskJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        MuleTaskJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        SendTaskJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);

        // gateways
        ExclusiveGatewayJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        InclusiveGatewayJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        ParallelGatewayJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        EventGatewayJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);

        // scope constructs
        SubProcessJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        EventSubProcessJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);

        // catch events
        CatchEventJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);

        // throw events
        ThrowEventJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);

        // boundary events
        BoundaryEventJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);

        // artifacts
        TextAnnotationJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
        DataStoreJsonConverter.fillTypes(convertersToBpmnMap,
                convertersToJsonMap);
    }

    private static final List<String> DI_CIRCLES = new ArrayList<String>();
    private static final List<String> DI_RECTANGLES = new ArrayList<String>();
    private static final List<String> DI_GATEWAY = new ArrayList<String>();

    static {
        DI_CIRCLES.add(STENCIL_EVENT_START_ERROR);
        DI_CIRCLES.add(STENCIL_EVENT_START_MESSAGE);
        DI_CIRCLES.add(STENCIL_EVENT_START_NONE);
        DI_CIRCLES.add(STENCIL_EVENT_START_TIMER);
        DI_CIRCLES.add(STENCIL_EVENT_START_SIGNAL);

        DI_CIRCLES.add(STENCIL_EVENT_BOUNDARY_ERROR);
        DI_CIRCLES.add(STENCIL_EVENT_BOUNDARY_SIGNAL);
        DI_CIRCLES.add(STENCIL_EVENT_BOUNDARY_TIMER);
        DI_CIRCLES.add(STENCIL_EVENT_BOUNDARY_MESSAGE);
        DI_CIRCLES.add(STENCIL_EVENT_BOUNDARY_CANCEL);
        DI_CIRCLES.add(STENCIL_EVENT_BOUNDARY_COMPENSATION);

        DI_CIRCLES.add(STENCIL_EVENT_CATCH_MESSAGE);
        DI_CIRCLES.add(STENCIL_EVENT_CATCH_SIGNAL);
        DI_CIRCLES.add(STENCIL_EVENT_CATCH_TIMER);

        DI_CIRCLES.add(STENCIL_EVENT_THROW_NONE);
        DI_CIRCLES.add(STENCIL_EVENT_THROW_SIGNAL);

        DI_CIRCLES.add(STENCIL_EVENT_END_NONE);
        DI_CIRCLES.add(STENCIL_EVENT_END_ERROR);
        DI_CIRCLES.add(STENCIL_EVENT_END_CANCEL);
        DI_CIRCLES.add(STENCIL_EVENT_END_TERMINATE);

        DI_RECTANGLES.add(STENCIL_CALL_ACTIVITY);
        DI_RECTANGLES.add(STENCIL_SUB_PROCESS);
        DI_RECTANGLES.add(STENCIL_EVENT_SUB_PROCESS);
        DI_RECTANGLES.add(STENCIL_TASK_BUSINESS_RULE);
        DI_RECTANGLES.add(STENCIL_TASK_MAIL);
        DI_RECTANGLES.add(STENCIL_TASK_MANUAL);
        DI_RECTANGLES.add(STENCIL_TASK_RECEIVE);
        DI_RECTANGLES.add(STENCIL_TASK_SCRIPT);
        DI_RECTANGLES.add(STENCIL_TASK_SEND);
        DI_RECTANGLES.add(STENCIL_TASK_SERVICE);
        DI_RECTANGLES.add(STENCIL_TASK_USER);
        DI_RECTANGLES.add(STENCIL_TASK_CAMEL);
        DI_RECTANGLES.add(STENCIL_TASK_MULE);
        DI_RECTANGLES.add(STENCIL_TEXT_ANNOTATION);

        DI_GATEWAY.add(STENCIL_GATEWAY_EVENT);
        DI_GATEWAY.add(STENCIL_GATEWAY_EXCLUSIVE);
        DI_GATEWAY.add(STENCIL_GATEWAY_INCLUSIVE);
        DI_GATEWAY.add(STENCIL_GATEWAY_PARALLEL);
    }

    protected ObjectMapper objectMapper = new ObjectMapper();

    public ObjectNode convertToJson(BpmnModel model) {
        ObjectNode modelNode = objectMapper.createObjectNode();
        double maxX = 0.0;
        double maxY = 0.0;

        for (GraphicInfo flowInfo : model.getLocationMap().values()) {
            if ((flowInfo.getX() + flowInfo.getWidth()) > maxX) {
                maxX = flowInfo.getX() + flowInfo.getWidth();
            }

            if ((flowInfo.getY() + flowInfo.getHeight()) > maxY) {
                maxY = flowInfo.getY() + flowInfo.getHeight();
            }
        }

        maxX += 50;
        maxY += 50;

        if (maxX < 1485) {
            maxX = 1485;
        }

        if (maxY < 700) {
            maxY = 700;
        }

        modelNode.put("bounds",
                BpmnJsonConverterUtil.createBoundsNode(maxX, maxY, 0, 0));
        modelNode.put("resourceId", "canvas");

        ObjectNode stencilNode = objectMapper.createObjectNode();
        stencilNode.put("id", "BPMNDiagram");
        modelNode.put("stencil", stencilNode);

        ObjectNode stencilsetNode = objectMapper.createObjectNode();
        stencilsetNode.put("namespace", "http://b3mn.org/stencilset/bpmn2.0#");
        stencilsetNode.put("url", "../editor/stencilsets/bpmn2.0/bpmn2.0.json");
        modelNode.put("stencilset", stencilsetNode);

        ArrayNode shapesArrayNode = objectMapper.createArrayNode();

        Process mainProcess = null;

        if (model.getPools().size() > 0) {
            mainProcess = model.getProcess(model.getPools().get(0).getId());
        } else {
            mainProcess = model.getMainProcess();
        }

        ObjectNode propertiesNode = objectMapper.createObjectNode();

        if (StringUtils.isNotEmpty(mainProcess.getId())) {
            propertiesNode.put(PROPERTY_PROCESS_ID, mainProcess.getId());
        }

        if (StringUtils.isNotEmpty(mainProcess.getName())) {
            propertiesNode.put(PROPERTY_NAME, mainProcess.getName());
        }

        if (StringUtils.isNotEmpty(mainProcess.getDocumentation())) {
            propertiesNode.put(PROPERTY_DOCUMENTATION,
                    mainProcess.getDocumentation());
        }

        if (mainProcess.isExecutable() == false) {
            propertiesNode.put(PROPERTY_PROCESS_EXECUTABLE, "No");
        }

        if (StringUtils.isNoneEmpty(model.getTargetNamespace())) {
            propertiesNode.put(PROPERTY_PROCESS_NAMESPACE,
                    model.getTargetNamespace());
        }

        BpmnJsonConverterUtil.convertMessagesToJson(model.getMessages(),
                propertiesNode);

        BpmnJsonConverterUtil.convertListenersToJson(
                mainProcess.getExecutionListeners(), true, propertiesNode);
        BpmnJsonConverterUtil.convertEventListenersToJson(
                mainProcess.getEventListeners(), propertiesNode);
        BpmnJsonConverterUtil.convertSignalDefinitionsToJson(model,
                propertiesNode);
        BpmnJsonConverterUtil.convertMessagesToJson(model, propertiesNode);

        if (CollectionUtils.isNotEmpty(mainProcess.getDataObjects())) {
            BpmnJsonConverterUtil.convertDataPropertiesToJson(
                    mainProcess.getDataObjects(), propertiesNode);
        }

        modelNode.put(EDITOR_SHAPE_PROPERTIES, propertiesNode);

        boolean poolHasDI = false;

        if (model.getPools().size() > 0) {
            for (Pool pool : model.getPools()) {
                GraphicInfo graphicInfo = model.getGraphicInfo(pool.getId());

                if (graphicInfo != null) {
                    poolHasDI = true;

                    break;
                }
            }
        }

        if ((model.getPools().size() > 0) && poolHasDI) {
            for (Pool pool : model.getPools()) {
                GraphicInfo graphicInfo = model.getGraphicInfo(pool.getId());

                if (graphicInfo == null) {
                    continue;
                }

                ObjectNode poolNode = BpmnJsonConverterUtil.createChildShape(
                        pool.getId(), STENCIL_POOL, graphicInfo.getX()
                                + graphicInfo.getWidth(), graphicInfo.getY()
                                + graphicInfo.getHeight(), graphicInfo.getX(),
                        graphicInfo.getY());
                shapesArrayNode.add(poolNode);

                ObjectNode poolPropertiesNode = objectMapper.createObjectNode();
                poolPropertiesNode.put(PROPERTY_OVERRIDE_ID, pool.getId());
                poolPropertiesNode.put(PROPERTY_PROCESS_ID,
                        pool.getProcessRef());

                if (pool.isExecutable() == false) {
                    poolPropertiesNode.put(PROPERTY_PROCESS_EXECUTABLE,
                            PROPERTY_VALUE_NO);
                }

                if (StringUtils.isNotEmpty(pool.getName())) {
                    poolPropertiesNode.put(PROPERTY_NAME, pool.getName());
                }

                poolNode.put(EDITOR_SHAPE_PROPERTIES, poolPropertiesNode);

                ArrayNode laneShapesArrayNode = objectMapper.createArrayNode();
                poolNode.put(EDITOR_CHILD_SHAPES, laneShapesArrayNode);

                ArrayNode outgoingArrayNode = objectMapper.createArrayNode();
                poolNode.put("outgoing", outgoingArrayNode);

                Process process = model.getProcess(pool.getId());

                if (process != null) {
                    Map<String, ArrayNode> laneMap = new HashMap<String, ArrayNode>();

                    for (Lane lane : process.getLanes()) {
                        GraphicInfo laneGraphicInfo = model.getGraphicInfo(lane
                                .getId());

                        if (laneGraphicInfo == null) {
                            continue;
                        }

                        ObjectNode laneNode = BpmnJsonConverterUtil
                                .createChildShape(lane.getId(), STENCIL_LANE,
                                        laneGraphicInfo.getX()
                                                + laneGraphicInfo.getWidth(),
                                        laneGraphicInfo.getY()
                                                + laneGraphicInfo.getHeight(),
                                        laneGraphicInfo.getX(),
                                        laneGraphicInfo.getY());
                        laneShapesArrayNode.add(laneNode);

                        ObjectNode lanePropertiesNode = objectMapper
                                .createObjectNode();
                        lanePropertiesNode.put(PROPERTY_OVERRIDE_ID,
                                lane.getId());

                        if (StringUtils.isNotEmpty(lane.getName())) {
                            lanePropertiesNode.put(PROPERTY_NAME,
                                    lane.getName());
                        }

                        laneNode.put(EDITOR_SHAPE_PROPERTIES,
                                lanePropertiesNode);

                        ArrayNode elementShapesArrayNode = objectMapper
                                .createArrayNode();
                        laneNode.put(EDITOR_CHILD_SHAPES,
                                elementShapesArrayNode);
                        laneNode.put("outgoing", objectMapper.createArrayNode());

                        laneMap.put(lane.getId(), elementShapesArrayNode);
                    }

                    for (FlowElement flowElement : process.getFlowElements()) {
                        Lane laneForElement = null;
                        GraphicInfo laneGraphicInfo = null;

                        FlowElement lookForElement = null;

                        if (flowElement instanceof SequenceFlow) {
                            SequenceFlow sequenceFlow = (SequenceFlow) flowElement;
                            lookForElement = model.getFlowElement(sequenceFlow
                                    .getSourceRef());
                        } else {
                            lookForElement = flowElement;
                        }

                        for (Lane lane : process.getLanes()) {
                            if (lane.getFlowReferences().contains(
                                    lookForElement.getId())) {
                                laneGraphicInfo = model.getGraphicInfo(lane
                                        .getId());

                                if (laneGraphicInfo != null) {
                                    laneForElement = lane;
                                }

                                break;
                            }
                        }

                        if (flowElement instanceof SequenceFlow
                                || (laneForElement != null)) {
                            processFlowElement(flowElement, process, model,
                                    laneMap.get(laneForElement.getId()),
                                    laneGraphicInfo.getX(),
                                    laneGraphicInfo.getY());
                        }
                    }

                    processArtifacts(process, model, shapesArrayNode, 0.0, 0.0);
                }

                for (MessageFlow messageFlow : model.getMessageFlows().values()) {
                    if (messageFlow.getSourceRef().equals(pool.getId())) {
                        outgoingArrayNode.add(BpmnJsonConverterUtil
                                .createResourceNode(messageFlow.getId()));
                    }
                }
            }

            processMessageFlows(model, shapesArrayNode);
        } else {
            processFlowElements(model.getMainProcess(), model, shapesArrayNode,
                    0.0, 0.0);
            processMessageFlows(model, shapesArrayNode);
        }

        modelNode.put(EDITOR_CHILD_SHAPES, shapesArrayNode);

        return modelNode;
    }

    public void processFlowElements(FlowElementsContainer container,
            BpmnModel model, ArrayNode shapesArrayNode, double subProcessX,
            double subProcessY) {
        for (FlowElement flowElement : container.getFlowElements()) {
            processFlowElement(flowElement, container, model, shapesArrayNode,
                    subProcessX, subProcessY);
        }

        processArtifacts(container, model, shapesArrayNode, subProcessX,
                subProcessY);
    }

    protected void processFlowElement(FlowElement flowElement,
            FlowElementsContainer container, BpmnModel model,
            ArrayNode shapesArrayNode, double containerX, double containerY) {
        Class<? extends BaseBpmnJsonConverter> converter = convertersToJsonMap
                .get(flowElement.getClass());

        if (converter != null) {
            try {
                converter.newInstance().convertToJson(flowElement, this, model,
                        container, shapesArrayNode, containerX, containerY);
            } catch (Exception e) {
                LOGGER.error("Error converting {}", flowElement, e);
            }
        }
    }

    protected void processArtifacts(FlowElementsContainer container,
            BpmnModel model, ArrayNode shapesArrayNode, double containerX,
            double containerY) {
        for (Artifact artifact : container.getArtifacts()) {
            Class<? extends BaseBpmnJsonConverter> converter = convertersToJsonMap
                    .get(artifact.getClass());

            if (converter != null) {
                try {
                    converter.newInstance().convertToJson(artifact, this,
                            model, container, shapesArrayNode, containerX,
                            containerY);
                } catch (Exception e) {
                    LOGGER.error("Error converting {}", artifact, e);
                }
            }
        }
    }

    protected void processMessageFlows(BpmnModel model,
            ArrayNode shapesArrayNode) {
        for (MessageFlow messageFlow : model.getMessageFlows().values()) {
            MessageFlowJsonConverter jsonConverter = new MessageFlowJsonConverter();
            jsonConverter.convertToJson(messageFlow, this, model, null,
                    shapesArrayNode, 0.0, 0.0);
        }
    }

    public BpmnModel convertToBpmnModel(JsonNode modelNode) {
        BpmnModel bpmnModel = new BpmnModel();

        bpmnModel.setTargetNamespace("http://activiti.org/test");

        Map<String, JsonNode> shapeMap = new HashMap<String, JsonNode>();
        Map<String, JsonNode> sourceRefMap = new HashMap<String, JsonNode>();
        Map<String, JsonNode> edgeMap = new HashMap<String, JsonNode>();
        Map<String, List<JsonNode>> sourceAndTargetMap = new HashMap<String, List<JsonNode>>();

        readShapeDI(modelNode, 0, 0, shapeMap, sourceRefMap, bpmnModel);
        filterAllEdges(modelNode, edgeMap, sourceAndTargetMap, shapeMap,
                sourceRefMap);
        readEdgeDI(edgeMap, sourceAndTargetMap, bpmnModel);

        ArrayNode shapesArrayNode = (ArrayNode) modelNode
                .get(EDITOR_CHILD_SHAPES);

        if ((shapesArrayNode == null) || (shapesArrayNode.size() == 0)) {
            return bpmnModel;
        }

        boolean nonEmptyPoolFound = false;
        Map<String, Lane> elementInLaneMap = new HashMap<String, Lane>();

        // first create the pool structure
        for (JsonNode shapeNode : shapesArrayNode) {
            String stencilId = BpmnJsonConverterUtil.getStencilId(shapeNode);

            if (STENCIL_POOL.equals(stencilId)) {
                Pool pool = new Pool();
                pool.setId(BpmnJsonConverterUtil.getElementId(shapeNode));
                pool.setName(JsonConverterUtil.getPropertyValueAsString(
                        PROPERTY_NAME, shapeNode));
                pool.setProcessRef(JsonConverterUtil.getPropertyValueAsString(
                        PROPERTY_PROCESS_ID, shapeNode));
                pool.setExecutable(JsonConverterUtil.getPropertyValueAsBoolean(
                        PROPERTY_PROCESS_EXECUTABLE, shapeNode, true));
                bpmnModel.getPools().add(pool);

                Process process = new Process();
                process.setId(pool.getProcessRef());
                process.setName(pool.getName());
                process.setExecutable(pool.isExecutable());
                bpmnModel.addProcess(process);

                ArrayNode laneArrayNode = (ArrayNode) shapeNode
                        .get(EDITOR_CHILD_SHAPES);

                for (JsonNode laneNode : laneArrayNode) {
                    // should be a lane, but just check to be certain
                    String laneStencilId = BpmnJsonConverterUtil
                            .getStencilId(laneNode);

                    if (STENCIL_LANE.equals(laneStencilId)) {
                        nonEmptyPoolFound = true;

                        Lane lane = new Lane();
                        lane.setId(BpmnJsonConverterUtil.getElementId(laneNode));
                        lane.setName(JsonConverterUtil
                                .getPropertyValueAsString(PROPERTY_NAME,
                                        laneNode));
                        lane.setParentProcess(process);
                        process.getLanes().add(lane);

                        processJsonElements(laneNode.get(EDITOR_CHILD_SHAPES),
                                modelNode, lane, shapeMap, bpmnModel);

                        if (CollectionUtils
                                .isNotEmpty(lane.getFlowReferences())) {
                            for (String elementRef : lane.getFlowReferences()) {
                                elementInLaneMap.put(elementRef, lane);
                            }
                        }
                    }
                }
            }
        }

        // Signal Definitions exist on the root level
        JsonNode signalDefinitionNode = BpmnJsonConverterUtil.getProperty(
                PROPERTY_SIGNAL_DEFINITIONS, modelNode);
        signalDefinitionNode = BpmnJsonConverterUtil
                .validateIfNodeIsTextual(signalDefinitionNode);
        signalDefinitionNode = BpmnJsonConverterUtil
                .validateIfNodeIsTextual(signalDefinitionNode); // no idea why this needs to be done twice ..

        if (signalDefinitionNode != null) {
            if (signalDefinitionNode instanceof ArrayNode) {
                ArrayNode signalDefinitionArrayNode = (ArrayNode) signalDefinitionNode;
                Iterator<JsonNode> signalDefinitionIterator = signalDefinitionArrayNode
                        .iterator();

                while (signalDefinitionIterator.hasNext()) {
                    JsonNode signalDefinitionJsonNode = signalDefinitionIterator
                            .next();
                    String signalId = signalDefinitionJsonNode.get(
                            PROPERTY_SIGNAL_DEFINITION_ID).asText();
                    String signalName = signalDefinitionJsonNode.get(
                            PROPERTY_SIGNAL_DEFINITION_NAME).asText();
                    String signalScope = signalDefinitionJsonNode.get(
                            PROPERTY_SIGNAL_DEFINITION_SCOPE).asText();

                    Signal signal = new Signal();
                    signal.setId(signalId);
                    signal.setName(signalName);
                    signal.setScope((signalScope.toLowerCase()
                            .equals("processinstance")) ? Signal.SCOPE_PROCESS_INSTANCE
                            : Signal.SCOPE_GLOBAL);
                    bpmnModel.addSignal(signal);
                }
            }
        }

        if (nonEmptyPoolFound == false) {
            Process process = new Process();
            bpmnModel.getProcesses().add(process);
            process.setId(BpmnJsonConverterUtil.getPropertyValueAsString(
                    PROPERTY_PROCESS_ID, modelNode));
            process.setName(BpmnJsonConverterUtil.getPropertyValueAsString(
                    PROPERTY_NAME, modelNode));

            String namespace = BpmnJsonConverterUtil.getPropertyValueAsString(
                    PROPERTY_PROCESS_NAMESPACE, modelNode);

            if (StringUtils.isNotEmpty(namespace)) {
                bpmnModel.setTargetNamespace(namespace);
            }

            process.setDocumentation(BpmnJsonConverterUtil
                    .getPropertyValueAsString(PROPERTY_DOCUMENTATION, modelNode));

            JsonNode processExecutableNode = JsonConverterUtil.getProperty(
                    PROPERTY_PROCESS_EXECUTABLE, modelNode);

            if ((processExecutableNode != null)
                    && StringUtils.isNotEmpty(processExecutableNode.asText())) {
                process.setExecutable(JsonConverterUtil
                        .getPropertyValueAsBoolean(PROPERTY_PROCESS_EXECUTABLE,
                                modelNode));
            }

            BpmnJsonConverterUtil.convertJsonToMessages(modelNode, bpmnModel);

            BpmnJsonConverterUtil.convertJsonToListeners(modelNode, process);

            JsonNode eventListenersNode = BpmnJsonConverterUtil.getProperty(
                    PROPERTY_EVENT_LISTENERS, modelNode);

            if (eventListenersNode != null) {
                eventListenersNode = BpmnJsonConverterUtil
                        .validateIfNodeIsTextual(eventListenersNode);
                BpmnJsonConverterUtil.parseEventListeners(
                        eventListenersNode.get(PROPERTY_EVENTLISTENER_VALUE),
                        process);
            }

            JsonNode processDataPropertiesNode = modelNode.get(
                    EDITOR_SHAPE_PROPERTIES).get(PROPERTY_DATA_PROPERTIES);

            if (processDataPropertiesNode != null) {
                List<ValuedDataObject> dataObjects = BpmnJsonConverterUtil
                        .convertJsonToDataProperties(processDataPropertiesNode,
                                process);
                process.setDataObjects(dataObjects);
                process.getFlowElements().addAll(dataObjects);
            }

            processJsonElements(shapesArrayNode, modelNode, process, shapeMap,
                    bpmnModel);
        } else {
            // sequence flows are on root level so need additional parsing for pools
            for (JsonNode shapeNode : shapesArrayNode) {
                if (STENCIL_SEQUENCE_FLOW
                        .equalsIgnoreCase(BpmnJsonConverterUtil
                                .getStencilId(shapeNode))
                        || STENCIL_ASSOCIATION
                                .equalsIgnoreCase(BpmnJsonConverterUtil
                                        .getStencilId(shapeNode))) {
                    String sourceRef = BpmnJsonConverterUtil.lookForSourceRef(
                            shapeNode.get(EDITOR_SHAPE_ID).asText(),
                            modelNode.get(EDITOR_CHILD_SHAPES));

                    if (sourceRef != null) {
                        Lane lane = elementInLaneMap.get(sourceRef);
                        SequenceFlowJsonConverter flowConverter = new SequenceFlowJsonConverter();

                        if (lane != null) {
                            flowConverter.convertToBpmnModel(shapeNode,
                                    modelNode, this, lane, shapeMap, bpmnModel);
                        } else {
                            flowConverter.convertToBpmnModel(shapeNode,
                                    modelNode, this, bpmnModel.getProcesses()
                                            .get(0), shapeMap, bpmnModel);
                        }
                    }
                }
            }
        }

        // sequence flows are now all on root level
        Map<String, SubProcess> subShapesMap = new HashMap<String, SubProcess>();

        for (Process process : bpmnModel.getProcesses()) {
            for (FlowElement flowElement : process
                    .findFlowElementsOfType(SubProcess.class)) {
                SubProcess subProcess = (SubProcess) flowElement;
                fillSubShapes(subShapesMap, subProcess);
            }

            if (subShapesMap.size() > 0) {
                List<String> removeSubFlowsList = new ArrayList<String>();

                for (FlowElement flowElement : process
                        .findFlowElementsOfType(SequenceFlow.class)) {
                    SequenceFlow sequenceFlow = (SequenceFlow) flowElement;

                    if (subShapesMap.containsKey(sequenceFlow.getSourceRef())) {
                        SubProcess subProcess = subShapesMap.get(sequenceFlow
                                .getSourceRef());

                        if (subProcess.getFlowElement(sequenceFlow.getId()) == null) {
                            subProcess.addFlowElement(sequenceFlow);
                            removeSubFlowsList.add(sequenceFlow.getId());
                        }
                    }
                }

                for (String flowId : removeSubFlowsList) {
                    process.removeFlowElement(flowId);
                }
            }
        }

        Map<String, FlowWithContainer> allFlowMap = new HashMap<String, FlowWithContainer>();
        List<Gateway> gatewayWithOrderList = new ArrayList<Gateway>();

        // post handling of process elements
        for (Process process : bpmnModel.getProcesses()) {
            postProcessElements(process, process.getFlowElements(), edgeMap,
                    bpmnModel, allFlowMap, gatewayWithOrderList);
        }

        // sort the sequence flows
        for (Gateway gateway : gatewayWithOrderList) {
            List<ExtensionElement> orderList = gateway.getExtensionElements()
                    .get("EDITOR_FLOW_ORDER");

            if (CollectionUtils.isNotEmpty(orderList)) {
                for (ExtensionElement orderElement : orderList) {
                    String flowValue = orderElement.getElementText();

                    if (StringUtils.isNotEmpty(flowValue)) {
                        if (allFlowMap.containsKey(flowValue)) {
                            FlowWithContainer flowWithContainer = allFlowMap
                                    .get(flowValue);
                            flowWithContainer.getFlowContainer()
                                    .removeFlowElement(
                                            flowWithContainer.getSequenceFlow()
                                                    .getId());
                            flowWithContainer
                                    .getFlowContainer()
                                    .addFlowElement(
                                            flowWithContainer.getSequenceFlow());
                        }
                    }
                }
            }

            gateway.getExtensionElements().remove("EDITOR_FLOW_ORDER");
        }

        return bpmnModel;
    }

    public void processJsonElements(JsonNode shapesArrayNode,
            JsonNode modelNode, BaseElement parentElement,
            Map<String, JsonNode> shapeMap, BpmnModel bpmnModel) {
        for (JsonNode shapeNode : shapesArrayNode) {
            String stencilId = BpmnJsonConverterUtil.getStencilId(shapeNode);
            Class<? extends BaseBpmnJsonConverter> converter = convertersToBpmnMap
                    .get(stencilId);

            try {
                BaseBpmnJsonConverter converterInstance = converter
                        .newInstance();
                converterInstance.convertToBpmnModel(shapeNode, modelNode,
                        this, parentElement, shapeMap, bpmnModel);
            } catch (Exception e) {
                LOGGER.error("Error converting {}",
                        BpmnJsonConverterUtil.getStencilId(shapeNode), e);
            }
        }
    }

    private void fillSubShapes(Map<String, SubProcess> subShapesMap,
            SubProcess subProcess) {
        for (FlowElement flowElement : subProcess.getFlowElements()) {
            if (flowElement instanceof SubProcess) {
                SubProcess childSubProcess = (SubProcess) flowElement;
                subShapesMap.put(childSubProcess.getId(), subProcess);
                fillSubShapes(subShapesMap, childSubProcess);
            } else {
                subShapesMap.put(flowElement.getId(), subProcess);
            }
        }
    }

    private void postProcessElements(FlowElementsContainer parentContainer,
            Collection<FlowElement> flowElementList,
            Map<String, JsonNode> edgeMap, BpmnModel bpmnModel,
            Map<String, FlowWithContainer> allFlowMap,
            List<Gateway> gatewayWithOrderList) {
        for (FlowElement flowElement : flowElementList) {
            if (flowElement instanceof Event) {
                Event event = (Event) flowElement;

                if (CollectionUtils.isNotEmpty(event.getEventDefinitions())) {
                    EventDefinition eventDef = event.getEventDefinitions().get(
                            0);

                    if (eventDef instanceof SignalEventDefinition) {
                        SignalEventDefinition signalEventDef = (SignalEventDefinition) eventDef;

                        if (StringUtils.isNotEmpty(signalEventDef
                                .getSignalRef())) {
                            if (bpmnModel.getSignal(signalEventDef
                                    .getSignalRef()) == null) {
                                bpmnModel.addSignal(new Signal(signalEventDef
                                        .getSignalRef(), signalEventDef
                                        .getSignalRef()));
                            }
                        }
                    } else if (eventDef instanceof MessageEventDefinition) {
                        MessageEventDefinition messageEventDef = (MessageEventDefinition) eventDef;

                        if (StringUtils.isNotEmpty(messageEventDef
                                .getMessageRef())) {
                            if (bpmnModel.getMessage(messageEventDef
                                    .getMessageRef()) == null) {
                                bpmnModel.addMessage(new Message(
                                        messageEventDef.getMessageRef(),
                                        messageEventDef.getMessageRef(), null));
                            }
                        }
                    }
                }
            }

            if (flowElement instanceof BoundaryEvent) {
                BoundaryEvent boundaryEvent = (BoundaryEvent) flowElement;
                Activity activity = retrieveAttachedRefObject(
                        boundaryEvent.getAttachedToRefId(),
                        parentContainer.getFlowElements());

                if (activity == null) {
                    LOGGER.warn("Boundary event " + boundaryEvent.getId()
                            + " is not attached to any activity");
                } else {
                    boundaryEvent.setAttachedToRef(activity);
                    activity.getBoundaryEvents().add(boundaryEvent);
                }
            } else if (flowElement instanceof Gateway) {
                if (flowElement.getExtensionElements().containsKey(
                        "EDITOR_FLOW_ORDER")) {
                    gatewayWithOrderList.add((Gateway) flowElement);
                }
            } else if (flowElement instanceof SubProcess) {
                SubProcess subProcess = (SubProcess) flowElement;
                postProcessElements(subProcess, subProcess.getFlowElements(),
                        edgeMap, bpmnModel, allFlowMap, gatewayWithOrderList);
            } else if (flowElement instanceof SequenceFlow) {
                SequenceFlow sequenceFlow = (SequenceFlow) flowElement;
                FlowElement sourceFlowElement = parentContainer
                        .getFlowElement(sequenceFlow.getSourceRef());

                if ((sourceFlowElement != null)
                        && sourceFlowElement instanceof FlowNode) {
                    FlowWithContainer flowWithContainer = new FlowWithContainer(
                            sequenceFlow, parentContainer);

                    if ((sequenceFlow.getExtensionElements().get(
                            "EDITOR_RESOURCEID") != null)
                            && (sequenceFlow.getExtensionElements()
                                    .get("EDITOR_RESOURCEID").size() > 0)) {
                        allFlowMap.put(
                                sequenceFlow.getExtensionElements()
                                        .get("EDITOR_RESOURCEID").get(0)
                                        .getElementText(), flowWithContainer);
                        sequenceFlow.getExtensionElements().remove(
                                "EDITOR_RESOURCEID");
                    }

                    ((FlowNode) sourceFlowElement).getOutgoingFlows().add(
                            sequenceFlow);

                    JsonNode edgeNode = edgeMap.get(sequenceFlow.getId());

                    if (edgeNode != null) {
                        boolean isDefault = JsonConverterUtil
                                .getPropertyValueAsBoolean("defaultflow",
                                        edgeNode);

                        if (isDefault) {
                            if (sourceFlowElement instanceof Activity) {
                                ((Activity) sourceFlowElement)
                                        .setDefaultFlow(sequenceFlow.getId());
                            } else if (sourceFlowElement instanceof Gateway) {
                                ((Gateway) sourceFlowElement)
                                        .setDefaultFlow(sequenceFlow.getId());
                            }
                        }
                    }
                }

                FlowElement targetFlowElement = parentContainer
                        .getFlowElement(sequenceFlow.getTargetRef());

                if ((targetFlowElement != null)
                        && targetFlowElement instanceof FlowNode) {
                    ((FlowNode) targetFlowElement).getIncomingFlows().add(
                            sequenceFlow);
                }
            }
        }
    }

    private Activity retrieveAttachedRefObject(String attachedToRefId,
            Collection<FlowElement> flowElementList) {
        Activity activity = null;

        if (StringUtils.isNotEmpty(attachedToRefId)) {
            for (FlowElement flowElement : flowElementList) {
                if (attachedToRefId.equals(flowElement.getId())) {
                    activity = (Activity) flowElement;

                    break;
                } else if (flowElement instanceof SubProcess) {
                    SubProcess subProcess = (SubProcess) flowElement;
                    Activity retrievedActivity = retrieveAttachedRefObject(
                            attachedToRefId, subProcess.getFlowElements());

                    if (retrievedActivity != null) {
                        activity = retrievedActivity;

                        break;
                    }
                }
            }
        }

        return activity;
    }

    private void readShapeDI(JsonNode objectNode, double parentX,
            double parentY, Map<String, JsonNode> shapeMap,
            Map<String, JsonNode> sourceRefMap, BpmnModel bpmnModel) {
        if (objectNode.get(EDITOR_CHILD_SHAPES) != null) {
            for (JsonNode jsonChildNode : objectNode.get(EDITOR_CHILD_SHAPES)) {
                String stencilId = BpmnJsonConverterUtil
                        .getStencilId(jsonChildNode);

                if (STENCIL_SEQUENCE_FLOW.equals(stencilId) == false) {
                    GraphicInfo graphicInfo = new GraphicInfo();

                    JsonNode boundsNode = jsonChildNode.get(EDITOR_BOUNDS);
                    ObjectNode upperLeftNode = (ObjectNode) boundsNode
                            .get(EDITOR_BOUNDS_UPPER_LEFT);
                    graphicInfo.setX(upperLeftNode.get(EDITOR_BOUNDS_X)
                            .asDouble() + parentX);
                    graphicInfo.setY(upperLeftNode.get(EDITOR_BOUNDS_Y)
                            .asDouble() + parentY);

                    ObjectNode lowerRightNode = (ObjectNode) boundsNode
                            .get(EDITOR_BOUNDS_LOWER_RIGHT);
                    graphicInfo.setWidth(lowerRightNode.get(EDITOR_BOUNDS_X)
                            .asDouble() - graphicInfo.getX() + parentX);
                    graphicInfo.setHeight(lowerRightNode.get(EDITOR_BOUNDS_Y)
                            .asDouble() - graphicInfo.getY() + parentY);

                    String childShapeId = jsonChildNode.get(EDITOR_SHAPE_ID)
                            .asText();
                    bpmnModel.addGraphicInfo(
                            BpmnJsonConverterUtil.getElementId(jsonChildNode),
                            graphicInfo);

                    shapeMap.put(childShapeId, jsonChildNode);

                    ArrayNode outgoingNode = (ArrayNode) jsonChildNode
                            .get("outgoing");

                    if ((outgoingNode != null) && (outgoingNode.size() > 0)) {
                        for (JsonNode outgoingChildNode : outgoingNode) {
                            JsonNode resourceNode = outgoingChildNode
                                    .get(EDITOR_SHAPE_ID);

                            if (resourceNode != null) {
                                sourceRefMap.put(resourceNode.asText(),
                                        jsonChildNode);
                            }
                        }
                    }

                    readShapeDI(jsonChildNode, graphicInfo.getX(),
                            graphicInfo.getY(), shapeMap, sourceRefMap,
                            bpmnModel);
                }
            }
        }
    }

    private void filterAllEdges(JsonNode objectNode,
            Map<String, JsonNode> edgeMap,
            Map<String, List<JsonNode>> sourceAndTargetMap,
            Map<String, JsonNode> shapeMap, Map<String, JsonNode> sourceRefMap) {
        if (objectNode.get(EDITOR_CHILD_SHAPES) != null) {
            for (JsonNode jsonChildNode : objectNode.get(EDITOR_CHILD_SHAPES)) {
                ObjectNode childNode = (ObjectNode) jsonChildNode;
                String stencilId = BpmnJsonConverterUtil
                        .getStencilId(childNode);

                if (STENCIL_SUB_PROCESS.equals(stencilId)) {
                    filterAllEdges(childNode, edgeMap, sourceAndTargetMap,
                            shapeMap, sourceRefMap);
                } else if (STENCIL_SEQUENCE_FLOW.equals(stencilId)
                        || STENCIL_ASSOCIATION.equals(stencilId)) {
                    String childEdgeId = BpmnJsonConverterUtil
                            .getElementId(childNode);
                    JsonNode targetNode = childNode.get("target");

                    if ((targetNode != null) && (targetNode.isNull() == false)) {
                        String targetRefId = targetNode.get(EDITOR_SHAPE_ID)
                                .asText();
                        List<JsonNode> sourceAndTargetList = new ArrayList<JsonNode>();
                        sourceAndTargetList.add(sourceRefMap.get(childNode.get(
                                EDITOR_SHAPE_ID).asText()));
                        sourceAndTargetList.add(shapeMap.get(targetRefId));
                        sourceAndTargetMap
                                .put(childEdgeId, sourceAndTargetList);
                    }

                    edgeMap.put(childEdgeId, childNode);
                }
            }
        }
    }

    private void readEdgeDI(Map<String, JsonNode> edgeMap,
            Map<String, List<JsonNode>> sourceAndTargetMap, BpmnModel bpmnModel) {
        for (String edgeId : edgeMap.keySet()) {
            JsonNode edgeNode = edgeMap.get(edgeId);
            List<JsonNode> sourceAndTargetList = sourceAndTargetMap.get(edgeId);

            JsonNode sourceRefNode = null;
            JsonNode targetRefNode = null;

            if ((sourceAndTargetList != null)
                    && (sourceAndTargetList.size() > 1)) {
                sourceRefNode = sourceAndTargetList.get(0);
                targetRefNode = sourceAndTargetList.get(1);
            }

            if (sourceRefNode == null) {
                LOGGER.info("Skipping edge {} because source ref is null",
                        edgeId);

                continue;
            }

            if (targetRefNode == null) {
                LOGGER.info("Skipping edge {} because target ref is null",
                        edgeId);

                continue;
            }

            JsonNode dockersNode = edgeNode.get(EDITOR_DOCKERS);
            double sourceDockersX = dockersNode.get(0).get(EDITOR_BOUNDS_X)
                    .asDouble();
            double sourceDockersY = dockersNode.get(0).get(EDITOR_BOUNDS_Y)
                    .asDouble();

            GraphicInfo sourceInfo = bpmnModel
                    .getGraphicInfo(BpmnJsonConverterUtil
                            .getElementId(sourceRefNode));
            GraphicInfo targetInfo = bpmnModel
                    .getGraphicInfo(BpmnJsonConverterUtil
                            .getElementId(targetRefNode));

            double sourceRefLineX = sourceInfo.getX() + sourceDockersX;
            double sourceRefLineY = sourceInfo.getY() + sourceDockersY;

            double nextPointInLineX;
            double nextPointInLineY;

            nextPointInLineX = dockersNode.get(1).get(EDITOR_BOUNDS_X)
                    .asDouble();
            nextPointInLineY = dockersNode.get(1).get(EDITOR_BOUNDS_Y)
                    .asDouble();

            if (dockersNode.size() == 2) {
                nextPointInLineX += targetInfo.getX();
                nextPointInLineY += targetInfo.getY();
            }

            Line2D firstLine = new Line2D(sourceRefLineX, sourceRefLineY,
                    nextPointInLineX, nextPointInLineY);

            String sourceRefStencilId = BpmnJsonConverterUtil
                    .getStencilId(sourceRefNode);
            String targetRefStencilId = BpmnJsonConverterUtil
                    .getStencilId(targetRefNode);

            List<GraphicInfo> graphicInfoList = new ArrayList<GraphicInfo>();

            AbstractContinuousCurve2D source2D = null;

            if (DI_CIRCLES.contains(sourceRefStencilId)) {
                source2D = new Circle2D(sourceInfo.getX() + sourceDockersX,
                        sourceInfo.getY() + sourceDockersY, sourceDockersX);
            } else if (DI_RECTANGLES.contains(sourceRefStencilId)) {
                source2D = createRectangle(sourceInfo);
            } else if (DI_GATEWAY.contains(sourceRefStencilId)) {
                source2D = createGateway(sourceInfo);
            }

            if (source2D != null) {
                Collection<Point2D> intersections = source2D
                        .intersections(firstLine);

                if ((intersections != null) && (intersections.size() > 0)) {
                    Point2D intersection = intersections.iterator().next();
                    graphicInfoList.add(createGraphicInfo(intersection.x(),
                            intersection.y()));
                } else {
                    graphicInfoList.add(createGraphicInfo(sourceRefLineX,
                            sourceRefLineY));
                }
            }

            Line2D lastLine = null;

            if (dockersNode.size() > 2) {
                for (int i = 1; i < (dockersNode.size() - 1); i++) {
                    double x = dockersNode.get(i).get(EDITOR_BOUNDS_X)
                            .asDouble();
                    double y = dockersNode.get(i).get(EDITOR_BOUNDS_Y)
                            .asDouble();
                    graphicInfoList.add(createGraphicInfo(x, y));
                }

                double startLastLineX = dockersNode.get(dockersNode.size() - 2)
                        .get(EDITOR_BOUNDS_X).asDouble();
                double startLastLineY = dockersNode.get(dockersNode.size() - 2)
                        .get(EDITOR_BOUNDS_Y).asDouble();

                double endLastLineX = dockersNode.get(dockersNode.size() - 1)
                        .get(EDITOR_BOUNDS_X).asDouble();
                double endLastLineY = dockersNode.get(dockersNode.size() - 1)
                        .get(EDITOR_BOUNDS_Y).asDouble();

                endLastLineX += targetInfo.getX();
                endLastLineY += targetInfo.getY();

                lastLine = new Line2D(startLastLineX, startLastLineY,
                        endLastLineX, endLastLineY);
            } else {
                lastLine = firstLine;
            }

            AbstractContinuousCurve2D target2D = null;

            if (DI_RECTANGLES.contains(targetRefStencilId)) {
                target2D = createRectangle(targetInfo);
            } else if (DI_CIRCLES.contains(targetRefStencilId)) {
                double targetDockersX = dockersNode.get(dockersNode.size() - 1)
                        .get(EDITOR_BOUNDS_X).asDouble();
                double targetDockersY = dockersNode.get(dockersNode.size() - 1)
                        .get(EDITOR_BOUNDS_Y).asDouble();

                target2D = new Circle2D(targetInfo.getX() + targetDockersX,
                        targetInfo.getY() + targetDockersY, targetDockersX);
            } else if (DI_GATEWAY.contains(targetRefStencilId)) {
                target2D = createGateway(targetInfo);
            }

            if (target2D != null) {
                Collection<Point2D> intersections = target2D
                        .intersections(lastLine);

                if ((intersections != null) && (intersections.size() > 0)) {
                    Point2D intersection = intersections.iterator().next();
                    graphicInfoList.add(createGraphicInfo(intersection.x(),
                            intersection.y()));
                } else {
                    graphicInfoList.add(createGraphicInfo(lastLine.getPoint2()
                            .x(), lastLine.getPoint2().y()));
                }
            }

            bpmnModel.addFlowGraphicInfoList(edgeId, graphicInfoList);

            // if sequence has a name, just add a label graphic info
            if (!"".equals(edgeNode.get("properties").get("name"))) {
                bpmnModel.addLabelGraphicInfo(
                        edgeId,
                        createGraphicInfo(graphicInfoList.get(0).getX(),
                                graphicInfoList.get(0).getY()));
            }
        }
    }

    private Polyline2D createRectangle(GraphicInfo graphicInfo) {
        Polyline2D rectangle = new Polyline2D(new Point2D(graphicInfo.getX(),
                graphicInfo.getY()), new Point2D(graphicInfo.getX()
                + graphicInfo.getWidth(), graphicInfo.getY()), new Point2D(
                graphicInfo.getX() + graphicInfo.getWidth(), graphicInfo.getY()
                        + graphicInfo.getHeight()), new Point2D(
                graphicInfo.getX(), graphicInfo.getY()
                        + graphicInfo.getHeight()), new Point2D(
                graphicInfo.getX(), graphicInfo.getY()));

        return rectangle;
    }

    private Polyline2D createGateway(GraphicInfo graphicInfo) {
        double middleX = graphicInfo.getX() + (graphicInfo.getWidth() / 2);
        double middleY = graphicInfo.getY() + (graphicInfo.getHeight() / 2);

        Polyline2D gatewayRectangle = new Polyline2D(new Point2D(
                graphicInfo.getX(), middleY), new Point2D(middleX,
                graphicInfo.getY()), new Point2D(graphicInfo.getX()
                + graphicInfo.getWidth(), middleY), new Point2D(middleX,
                graphicInfo.getY() + graphicInfo.getHeight()), new Point2D(
                graphicInfo.getX(), middleY));

        return gatewayRectangle;
    }

    private GraphicInfo createGraphicInfo(double x, double y) {
        GraphicInfo graphicInfo = new GraphicInfo();
        graphicInfo.setX(x);
        graphicInfo.setY(y);

        return graphicInfo;
    }

    class FlowWithContainer {
        protected SequenceFlow sequenceFlow;
        protected FlowElementsContainer flowContainer;

        public FlowWithContainer(SequenceFlow sequenceFlow,
                FlowElementsContainer flowContainer) {
            this.sequenceFlow = sequenceFlow;
            this.flowContainer = flowContainer;
        }

        public SequenceFlow getSequenceFlow() {
            return sequenceFlow;
        }

        public void setSequenceFlow(SequenceFlow sequenceFlow) {
            this.sequenceFlow = sequenceFlow;
        }

        public FlowElementsContainer getFlowContainer() {
            return flowContainer;
        }

        public void setFlowContainer(FlowElementsContainer flowContainer) {
            this.flowContainer = flowContainer;
        }
    }
}
