/* 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.workflow.simple.converter.step;
import java.util.ArrayList;
import java.util.List;
import org.activiti.bpmn.model.EndEvent;
import org.activiti.bpmn.model.ExclusiveGateway;
import org.activiti.bpmn.model.FlowElement;
import org.activiti.bpmn.model.SequenceFlow;
import org.activiti.workflow.simple.converter.WorkflowDefinitionConversion;
import org.activiti.workflow.simple.converter.WorkflowDefinitionConversionFactory;
import org.activiti.workflow.simple.definition.ChoiceStepsDefinition;
import org.activiti.workflow.simple.definition.ConditionDefinition;
import org.activiti.workflow.simple.definition.ListConditionStepDefinition;
import org.activiti.workflow.simple.definition.StepDefinition;
/**
* {@link StepDefinitionConverter} for converting a {@link ChoiceStepsDefinition} to the following BPMN 2.0 structure:
*
* __ t1___
* | |
* + -- ...---+-
* | |
* - txxx---
*
* @author Tijs Rademakers
*/
public class ChoiceStepsDefinitionConverter extends BaseStepDefinitionConverter<ChoiceStepsDefinition, ExclusiveGateway> {
private static final long serialVersionUID = 1L;
private static final String EXLCUSIVE_GATEWAY_PREFIX = "exclusiveGateway";
public Class< ? extends StepDefinition> getHandledClass() {
return ChoiceStepsDefinition.class;
}
protected ExclusiveGateway createProcessArtifact(ChoiceStepsDefinition choiceStepsDefinition, WorkflowDefinitionConversion conversion) {
// First choice gateway
ExclusiveGateway forkGateway = createExclusiveGateway(conversion);
// Sequence flow from last activity to first gateway
addSequenceFlow(conversion, conversion.getLastActivityId(), forkGateway.getId());
conversion.setLastActivityId(forkGateway.getId());
// Convert all other steps, disabling activity id updates which makes all
// generated steps have a sequence flow to the first gateway
WorkflowDefinitionConversionFactory conversionFactory = conversion.getConversionFactory();
List<FlowElement> endElements = new ArrayList<FlowElement>();
List<SequenceFlow> bypassingFlows = new ArrayList<SequenceFlow>();
for (ListConditionStepDefinition<ChoiceStepsDefinition> stepListDefinition : choiceStepsDefinition.getStepList()) {
StringBuilder conditionBuilder = new StringBuilder();
for (ConditionDefinition conditionDefintion : stepListDefinition.getConditions()) {
if (conditionBuilder.length() > 0) {
conditionBuilder.append(" && ");
} else {
conditionBuilder.append("${");
}
conditionBuilder.append(conditionDefintion.getLeftOperand());
conditionBuilder.append(" ");
conditionBuilder.append(conditionDefintion.getOperator());
conditionBuilder.append(" ");
conditionBuilder.append(conditionDefintion.getRightOperand());
}
for (int i = 0; i < stepListDefinition.getSteps().size(); i++) {
if (i == 0) {
conversion.setSequenceflowGenerationEnabled(false);
} else {
conversion.setSequenceflowGenerationEnabled(true);
}
StepDefinition step = stepListDefinition.getSteps().get(i);
FlowElement flowElement = (FlowElement) conversionFactory.getStepConverterFor(step).convertStepDefinition(step, conversion);
if (i == 0) {
if (conditionBuilder.length() > 0) {
conditionBuilder.append("}");
SequenceFlow mainFlow = addSequenceFlow(conversion, forkGateway.getId(), flowElement.getId(), conditionBuilder.toString());
if(stepListDefinition.getName() != null) {
mainFlow.setName(stepListDefinition.getName());
}
} else {
addSequenceFlow(conversion, forkGateway.getId(), flowElement.getId());
}
}
if ((i + 1) == stepListDefinition.getSteps().size()) {
endElements.add(flowElement);
}
}
if(stepListDefinition.getSteps().isEmpty()) {
// Special case for a "stepless" stepListDefinition, which should just create a sequence-flow from the fork to the join
SequenceFlow created = null;
if (conditionBuilder.length() > 0) {
conditionBuilder.append("}");
created = addSequenceFlow(conversion, forkGateway.getId(), null, conditionBuilder.toString());
} else {
created = addSequenceFlow(conversion, forkGateway.getId(), null);
}
if(stepListDefinition.getName() != null) {
created.setName(stepListDefinition.getName());
}
bypassingFlows.add(created);
}
}
conversion.setSequenceflowGenerationEnabled(false);
// Second choice gateway
ExclusiveGateway joinGateway = createExclusiveGateway(conversion);
conversion.setLastActivityId(joinGateway.getId());
conversion.setSequenceflowGenerationEnabled(true);
// Create sequenceflow from all generated steps to the second gateway
for (FlowElement endElement : endElements) {
if(!(endElement instanceof EndEvent)) {
addSequenceFlow(conversion, endElement.getId(), joinGateway.getId());
}
}
for(SequenceFlow bypassingFlow : bypassingFlows) {
bypassingFlow.setTargetRef(joinGateway.getId());
}
return forkGateway;
}
protected ExclusiveGateway createExclusiveGateway(WorkflowDefinitionConversion conversion) {
ExclusiveGateway exclusiveGateway = new ExclusiveGateway();
exclusiveGateway.setId(conversion.getUniqueNumberedId(EXLCUSIVE_GATEWAY_PREFIX));
conversion.getProcess().addFlowElement(exclusiveGateway);
return exclusiveGateway;
}
}