/**
* 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.jbpm.workflow.core.impl;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.drools.definition.process.Connection;
import org.drools.definition.process.NodeContainer;
import org.jbpm.process.core.Context;
import org.jbpm.process.core.ContextResolver;
import org.jbpm.workflow.core.Node;
import org.jbpm.workflow.core.node.CompositeNode;
/**
* Default implementation of a node.
*
* @author <a href="mailto:kris_verlaenen@hotmail.com">Kris Verlaenen</a>
*/
public abstract class NodeImpl implements Node, Serializable, ContextResolver {
private static final long serialVersionUID = 510l;
protected static final NodeImpl[] EMPTY_NODE_ARRAY = new NodeImpl[0];
private long id;
private String name;
private Map<String, List<Connection>> incomingConnections;
private Map<String, List<Connection>> outgoingConnections;
private NodeContainer nodeContainer;
private Map<String, Context> contexts = new HashMap<String, Context>();
private Map<String, Object> metaData = new HashMap<String, Object>();
public NodeImpl() {
this.id = -1;
this.incomingConnections = new HashMap<String, List<Connection>>();
this.outgoingConnections = new HashMap<String, List<Connection>>();
}
public long getId() {
return this.id;
}
public String getUniqueId() {
String result = id + "";
NodeContainer nodeContainer = getNodeContainer();
while (nodeContainer instanceof CompositeNode) {
CompositeNode composite = (CompositeNode) nodeContainer;
result = composite.getId() + ":" + result;
nodeContainer = composite.getNodeContainer();
}
return result;
}
public void setId(final long id) {
this.id = id;
}
public String getName() {
return this.name;
}
public void setName(final String name) {
this.name = name;
}
public Map<String, List<Connection>> getIncomingConnections() {
// TODO: users can still modify the lists inside this Map
return Collections.unmodifiableMap(this.incomingConnections);
}
public Map<String, List<Connection>> getOutgoingConnections() {
// TODO: users can still modify the lists inside this Map
return Collections.unmodifiableMap(this.outgoingConnections);
}
public void addIncomingConnection(final String type, final Connection connection) {
validateAddIncomingConnection(type, connection);
List<Connection> connections = this.incomingConnections.get(type);
if (connections == null) {
connections = new ArrayList<Connection>();
this.incomingConnections.put(type, connections);
}
connections.add(connection);
}
public void validateAddIncomingConnection(final String type, final Connection connection) {
if (type == null) {
throw new IllegalArgumentException("Connection type cannot be null");
}
if (connection == null) {
throw new IllegalArgumentException("Connection cannot be null");
}
}
public List<Connection> getIncomingConnections(String type) {
List<Connection> result = incomingConnections.get(type);
if (result == null) {
return new ArrayList<Connection>();
}
return result;
}
public void addOutgoingConnection(final String type, final Connection connection) {
validateAddOutgoingConnection(type, connection);
List<Connection> connections = this.outgoingConnections.get(type);
if (connections == null) {
connections = new ArrayList<Connection>();
this.outgoingConnections.put(type, connections);
}
connections.add(connection);
}
public void validateAddOutgoingConnection(final String type, final Connection connection) {
if (type == null) {
throw new IllegalArgumentException("Connection type cannot be null");
}
if (connection == null) {
throw new IllegalArgumentException("Connection cannot be null");
}
}
public List<Connection> getOutgoingConnections(String type) {
List<Connection> result = outgoingConnections.get(type);
if (result == null) {
return new ArrayList<Connection>();
}
return result;
}
public void removeIncomingConnection(final String type, final Connection connection) {
validateRemoveIncomingConnection(type, connection);
this.incomingConnections.get(type).remove(connection);
}
public void validateRemoveIncomingConnection(final String type, final Connection connection) {
if (type == null) {
throw new IllegalArgumentException("Connection type cannot be null");
}
if (connection == null) {
throw new IllegalArgumentException("Connection is null");
}
if (!incomingConnections.get(type).contains(connection)) {
throw new IllegalArgumentException("Given connection <"
+ connection + "> is not part of the incoming connections");
}
}
public void removeOutgoingConnection(final String type, final Connection connection) {
validateRemoveOutgoingConnection(type, connection);
this.outgoingConnections.get(type).remove(connection);
}
public void validateRemoveOutgoingConnection(final String type, final Connection connection) {
if (type == null) {
throw new IllegalArgumentException("Connection type cannot be null");
}
if (connection == null) {
throw new IllegalArgumentException("Connection is null");
}
if (!this.outgoingConnections.get(type).contains(connection)) {
throw new IllegalArgumentException("Given connection <"
+ connection + "> is not part of the outgoing connections");
}
}
/** Helper method for nodes that have at most one default incoming connection */
public Connection getFrom() {
final List<Connection> list =
getIncomingConnections(org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE);
if (list.size() == 0) {
return null;
}
if (list.size() == 1) {
return list.get(0);
}
throw new IllegalArgumentException(
"Trying to retrieve the from connection but multiple connections are present");
}
/** Helper method for nodes that have at most one default outgoing connection */
public Connection getTo() {
final List<Connection> list =
getOutgoingConnections(org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE);
if (list.size() == 0) {
return null;
}
if (list.size() == 1) {
return list.get(0);
}
throw new IllegalArgumentException(
"Trying to retrieve the to connection but multiple connections are present");
}
/** Helper method for nodes that have multiple default incoming connections */
public List<Connection> getDefaultIncomingConnections() {
return getIncomingConnections(org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE);
}
/** Helper method for nodes that have multiple default outgoing connections */
public List<Connection> getDefaultOutgoingConnections() {
return getOutgoingConnections(org.jbpm.workflow.core.Node.CONNECTION_DEFAULT_TYPE);
}
public NodeContainer getNodeContainer() {
return nodeContainer;
}
public void setNodeContainer(NodeContainer nodeContainer) {
this.nodeContainer = nodeContainer;
}
public void setContext(String contextId, Context context) {
this.contexts.put(contextId, context);
}
public Context getContext(String contextId) {
return this.contexts.get(contextId);
}
public Context resolveContext(String contextId, Object param) {
Context context = getContext(contextId);
if (context != null) {
context = context.resolveContext(param);
if (context != null) {
return context;
}
}
return ((org.jbpm.workflow.core.NodeContainer) nodeContainer).resolveContext(contextId, param);
}
public void setMetaData(String name, Object value) {
this.metaData.put(name, value);
}
public Object getMetaData(String name) {
return this.metaData.get(name);
}
public Map<String, Object> getMetaData() {
return this.metaData;
}
public void setMetaData(Map<String, Object> metaData) {
this.metaData = metaData;
}
}