/*
* Copyright 2005 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.eclipse.flow.common.editor.core.command;
import java.util.Iterator;
import java.util.List;
import org.drools.eclipse.flow.common.editor.core.ElementConnection;
import org.drools.eclipse.flow.common.editor.core.ElementWrapper;
import org.eclipse.gef.commands.Command;
/**
* A command for creating an element.
*/
public class ElementConnectionCreateCommand extends Command {
private ElementConnection connection;
private ElementWrapper source;
private ElementWrapper target;
public boolean canExecute() {
if (source.equals(target)) {
return false;
}
// Check for existence of connection already
List connections = source.getOutgoingConnections();
for (Iterator it = connections.iterator(); it.hasNext(); ) {
ElementConnection conn = (ElementConnection) it.next();
if (conn.getTarget().equals(target)) {
return false;
}
}
return source.acceptsOutgoingConnection(connection, target)
&& target != null && target.acceptsIncomingConnection(connection, source);
}
public void execute() {
connection.connect(source, target);
}
public ElementWrapper getSource() {
return source;
}
public ElementWrapper getTarget() {
return target;
}
public void redo() {
connection.connect(source, target);
}
public void setSource(ElementWrapper source) {
this.source = source;
}
public void setConnection(ElementConnection connection) {
this.connection = connection;
}
public void setTarget(ElementWrapper target) {
this.target = target;
}
public void undo() {
connection.disconnect();
}
}