org.drools.bpmn2.xml.ProcessHandler Maven / Gradle / Ivy
/**
* Copyright 2010 JBoss Inc
*
* 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.drools.bpmn2.xml;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import org.drools.bpmn2.core.Definitions;
import org.drools.bpmn2.core.Error;
import org.drools.bpmn2.core.Escalation;
import org.drools.bpmn2.core.Interface;
import org.drools.bpmn2.core.ItemDefinition;
import org.drools.bpmn2.core.Lane;
import org.drools.bpmn2.core.Message;
import org.drools.bpmn2.core.SequenceFlow;
import org.drools.compiler.xml.ProcessBuildData;
import org.drools.definition.process.Node;
import org.drools.definition.process.NodeContainer;
import org.drools.process.core.context.exception.ActionExceptionHandler;
import org.drools.process.core.context.exception.ExceptionScope;
import org.drools.process.core.context.swimlane.Swimlane;
import org.drools.process.core.event.EventTypeFilter;
import org.drools.process.core.timer.Timer;
import org.drools.ruleflow.core.RuleFlowProcess;
import org.drools.workflow.core.Connection;
import org.drools.workflow.core.Constraint;
import org.drools.workflow.core.impl.ConnectionImpl;
import org.drools.workflow.core.impl.ConnectionRef;
import org.drools.workflow.core.impl.ConstraintImpl;
import org.drools.workflow.core.impl.DroolsConsequenceAction;
import org.drools.workflow.core.impl.NodeImpl;
import org.drools.workflow.core.node.CompositeContextNode;
import org.drools.workflow.core.node.EventNode;
import org.drools.workflow.core.node.HumanTaskNode;
import org.drools.workflow.core.node.Split;
import org.drools.workflow.core.node.StateNode;
import org.drools.xml.BaseAbstractHandler;
import org.drools.xml.ExtensibleXmlParser;
import org.drools.xml.Handler;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
public class ProcessHandler extends BaseAbstractHandler implements Handler {
public static final String CONNECTIONS = "BPMN.Connections";
@SuppressWarnings("unchecked")
public ProcessHandler() {
if ((this.validParents == null) && (this.validPeers == null)) {
this.validParents = new HashSet();
this.validParents.add(Definitions.class);
this.validPeers = new HashSet();
this.validPeers.add(null);
this.validPeers.add(ItemDefinition.class);
this.validPeers.add(Message.class);
this.validPeers.add(Interface.class);
this.validPeers.add(Escalation.class);
this.validPeers.add(Error.class);
this.allowNesting = false;
}
}
public Object start(final String uri, final String localName,
final Attributes attrs, final ExtensibleXmlParser parser)
throws SAXException {
parser.startElementBuilder(localName, attrs);
String id = attrs.getValue("id");
String name = attrs.getValue("name");
String packageName = attrs.getValue("http://www.jboss.org/drools", "packageName");
RuleFlowProcess process = new RuleFlowProcess();
process.setAutoComplete(true);
process.setId(id);
if (name == null) {
name = id;
}
process.setName(name);
process.setType("RuleFlow");
if (packageName == null) {
packageName = "org.drools.bpmn2";
}
process.setPackageName(packageName);
((ProcessBuildData) parser.getData()).setProcess(process);
return process;
}
@SuppressWarnings("unchecked")
public Object end(final String uri, final String localName,
final ExtensibleXmlParser parser) throws SAXException {
parser.endElementBuilder();
RuleFlowProcess process = (RuleFlowProcess) parser.getCurrent();
List connections = (List)
process.getMetaData(CONNECTIONS);
linkConnections(process, connections);
linkBoundaryEvents(process);
List lanes = (List)
process.getMetaData(LaneHandler.LANES);
assignLanes(process, lanes);
postProcessNodes(process);
return process;
}
public Class generateNodeFor() {
return org.drools.definition.process.Process.class;
}
public static void linkConnections(NodeContainer nodeContainer, List connections) {
if (connections != null) {
for (SequenceFlow connection: connections) {
String sourceRef = connection.getSourceRef();
String targetRef = connection.getTargetRef();
Node source = null;
Node target = null;
try {
// remove starting _
sourceRef = sourceRef.substring(1);
// remove ids of parent nodes
sourceRef = sourceRef.substring(sourceRef.lastIndexOf("-") + 1);
source = nodeContainer.getNode(new Integer(sourceRef));
} catch (NumberFormatException e) {
// try looking for a node with same "UniqueId" (in metadata)
for (Node node: nodeContainer.getNodes()) {
if (connection.getSourceRef().equals(node.getMetaData("UniqueId"))) {
source = node;
break;
}
}
if (source == null) {
throw new IllegalArgumentException("Could not find source node for connection:" + connection.getSourceRef());
}
}
try {
// remove starting _
targetRef = targetRef.substring(1);
// remove ids of parent nodes
targetRef = targetRef.substring(targetRef.lastIndexOf("-") + 1);
target = nodeContainer.getNode(new Integer(targetRef));
} catch (NumberFormatException e) {
// try looking for a node with same "UniqueId" (in metadata)
for (Node node: nodeContainer.getNodes()) {
if (connection.getTargetRef().equals(node.getMetaData("UniqueId"))) {
target = node;
break;
}
}
if (target == null) {
throw new IllegalArgumentException("Could not find target node for connection:" + connection.getTargetRef());
}
}
Connection result = new ConnectionImpl(
source, NodeImpl.CONNECTION_DEFAULT_TYPE,
target, NodeImpl.CONNECTION_DEFAULT_TYPE);
result.setMetaData("bendpoints", connection.getBendpoints());
result.setMetaData("UniqueId", connection.getId());
if (source instanceof Split) {
Split split = (Split) source;
Constraint constraint = new ConstraintImpl();
String defaultConnection = (String) split.getMetaData("Default");
if (defaultConnection != null && defaultConnection.equals(connection.getId())) {
constraint.setDefault(true);
}
if (connection.getName() != null) {
constraint.setName(connection.getName());
} else {
constraint.setName("");
}
if (connection.getType() != null) {
constraint.setType(connection.getType());
} else {
constraint.setType("code");
}
if (connection.getLanguage() != null) {
constraint.setDialect(connection.getLanguage());
}
if (connection.getExpression() != null) {
constraint.setConstraint(connection.getExpression());
}
split.addConstraint(
new ConnectionRef(target.getId(), NodeImpl.CONNECTION_DEFAULT_TYPE),
constraint);
}
}
}
}
public static void linkBoundaryEvents(NodeContainer nodeContainer) {
for (Node node: nodeContainer.getNodes()) {
if (node instanceof EventNode) {
String attachedTo = (String) node.getMetaData("AttachedTo");
if (attachedTo != null) {
String type = ((EventTypeFilter)
((EventNode) node).getEventFilters().get(0)).getType();
Node attachedNode = null;
try {
// remove starting _
String attachedToString = attachedTo.substring(1);
// remove ids of parent nodes
attachedToString = attachedToString.substring(attachedToString.lastIndexOf("-") + 1);
attachedNode = nodeContainer.getNode(new Integer(attachedToString));
} catch (NumberFormatException e) {
// try looking for a node with same "UniqueId" (in metadata)
for (Node subnode: nodeContainer.getNodes()) {
if (attachedTo.equals(subnode.getMetaData("UniqueId"))) {
attachedNode = subnode;
break;
}
}
if (attachedNode == null) {
throw new IllegalArgumentException("Could not find node to attach to: " + attachedTo);
}
}
if (type.startsWith("Escalation-")) {
boolean cancelActivity = (Boolean) node.getMetaData("CancelActivity");
CompositeContextNode compositeNode = (CompositeContextNode) attachedNode;
ExceptionScope exceptionScope = (ExceptionScope)
compositeNode.getDefaultContext(ExceptionScope.EXCEPTION_SCOPE);
if (exceptionScope == null) {
exceptionScope = new ExceptionScope();
compositeNode.addContext(exceptionScope);
compositeNode.setDefaultContext(exceptionScope);
}
String escalationCode = (String) node.getMetaData("EscalationEvent");
ActionExceptionHandler exceptionHandler = new ActionExceptionHandler();
exceptionHandler.setAction(new DroolsConsequenceAction("java",
(cancelActivity ? "((org.drools.workflow.instance.NodeInstance) kcontext.getNodeInstance()).cancel();" : "") +
"kcontext.getProcessInstance().signalEvent(\"Escalation-" + attachedTo + "-" + escalationCode + "\", null);"));
exceptionScope.setExceptionHandler(escalationCode, exceptionHandler);
} else if (type.startsWith("Error-")) {
CompositeContextNode compositeNode = (CompositeContextNode) attachedNode;
ExceptionScope exceptionScope = (ExceptionScope)
compositeNode.getDefaultContext(ExceptionScope.EXCEPTION_SCOPE);
if (exceptionScope == null) {
exceptionScope = new ExceptionScope();
compositeNode.addContext(exceptionScope);
compositeNode.setDefaultContext(exceptionScope);
}
String errorCode = (String) node.getMetaData("ErrorEvent");
ActionExceptionHandler exceptionHandler = new ActionExceptionHandler();
exceptionHandler.setAction(new DroolsConsequenceAction("java",
"((org.drools.workflow.instance.NodeInstance) kcontext.getNodeInstance()).cancel();" +
"kcontext.getProcessInstance().signalEvent(\"Error-" + attachedTo + "-" + errorCode + "\", null);"));
exceptionScope.setExceptionHandler(errorCode, exceptionHandler);
} else if (type.startsWith("Timer-")) {
boolean cancelActivity = (Boolean) node.getMetaData("CancelActivity");
CompositeContextNode compositeNode = (CompositeContextNode) attachedNode;
String timeCycle = (String) node.getMetaData("TimeCycle");
Timer timer = new Timer();
timer.setDelay(timeCycle);
compositeNode.addTimer(timer, new DroolsConsequenceAction("java",
(cancelActivity ? "((org.drools.workflow.instance.NodeInstance) kcontext.getNodeInstance()).cancel();" : "") +
"kcontext.getProcessInstance().signalEvent(\"Timer-" + attachedTo + "-" + timeCycle + "\", null);"));
} else if (type.startsWith("Compensate-")) {
String uniqueId = (String) node.getMetaData("UniqueId");
String eventType = "Compensate-" + uniqueId;
((EventTypeFilter) ((EventNode) node).getEventFilters().get(0)).setType(eventType);
}
}
}
}
}
private void assignLanes(RuleFlowProcess process, List lanes) {
List laneNames = new ArrayList();
Map laneMapping = new HashMap();
if (lanes != null) {
for (Lane lane: lanes) {
String name = lane.getName();
if (name != null) {
Swimlane swimlane = new Swimlane();
swimlane.setName(name);
process.getSwimlaneContext().addSwimlane(swimlane);
laneNames.add(name);
for (String flowElementRef: lane.getFlowElements()) {
laneMapping.put(flowElementRef, name);
}
}
}
}
assignLanes(process, laneMapping);
}
private void postProcessNodes(NodeContainer container) {
for (Node node: container.getNodes()) {
if (node instanceof StateNode) {
StateNode stateNode = (StateNode) node;
String condition = (String) stateNode.getMetaData("Condition");
Constraint constraint = new ConstraintImpl();
constraint.setConstraint(condition);
constraint.setType("rule");
for (org.drools.definition.process.Connection connection: stateNode.getDefaultOutgoingConnections()) {
stateNode.setConstraint(connection, constraint);
}
} else if (node instanceof NodeContainer) {
postProcessNodes((NodeContainer) node);
}
}
}
private void assignLanes(NodeContainer nodeContainer, Map laneMapping) {
for (Node node: nodeContainer.getNodes()) {
String lane = null;
String uniqueId = (String) node.getMetaData("UniqueId");
if (uniqueId != null) {
lane = laneMapping.get(uniqueId);
} else {
lane = laneMapping.get(XmlBPMNProcessDumper.getUniqueNodeId(node));
}
if (lane != null) {
((NodeImpl) node).setMetaData("Lane", lane);
if (node instanceof HumanTaskNode) {
((HumanTaskNode) node).setSwimlane(lane);
}
}
if (node instanceof NodeContainer) {
assignLanes((NodeContainer) node, laneMapping);
}
}
}
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