connectioncommand.java

一个java写的business process management系统

/*
 * Copyright (c) 2003, Alexander Greif
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Flow4J-Eclipse project nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package net.orthanc.flow4j.designer.model.commands;

import net.orthanc.flow4j.designer.core.Flow4JPlugin;
import net.orthanc.flow4j.designer.model.FlowletModelPart;
import net.orthanc.flow4j.designer.model.TransitionModelPart;

import org.eclipse.gef.commands.Command;

/**
 * @author agreif
 *
 * TODO
 * 
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
public class ConnectionCommand extends Command {

	private TransitionModelPart transition;
	
	private FlowletModelPart source;
	private FlowletModelPart target;
	private FlowletModelPart oldSource;
	private FlowletModelPart oldTarget;
	
	private int sourceAnchorIndex;
	private int targetAnchorIndex; 
	private int oldSourceAnchorIndex;
	private int oldTargetAnchorIndex;


	/**
	 * Constructor that creates a ConnectionCommand
	 * 
	 */
	public ConnectionCommand() {
		super(Flow4JPlugin.getResourceString("Command_Connection.label"));
	}

	/**
	 * TODO
	 * @param label
	 */
	public ConnectionCommand(String label) {
		super(label);
		// TODO Auto-generated constructor stub
	}




	/**
	 * @see org.eclipse.gef.commands.Command#canExecute()
	 */
	public boolean canExecute(){
		return true;
	}



	/**
	 * @see org.eclipse.gef.commands.Command#execute()
	 */
	public void execute() {
		if (source != null) {
			transition.detachSource();
			transition.setSource(source);
			transition.setSourceAnchorIndex(sourceAnchorIndex);
			transition.attachSource();
		}
		if (target != null) {
			transition.detachTarget();
			transition.setTarget(target);
			transition.setTargetAnchorIndex(targetAnchorIndex);
			transition.attachTarget();
		}
		if (source == null && target == null) {
			transition.detachSource();
			transition.detachTarget();
			transition.setTarget(null);
			transition.setSource(null);
		}
	}


	/**
	 * @see org.eclipse.gef.commands.Command#redo()
	 */
	public void redo() { 
		execute();
	}

	/**
	 * @see org.eclipse.gef.commands.Command#undo()
	 */
	public void undo() {
		source = transition.getSource();
		target = transition.getTarget();
		sourceAnchorIndex = transition.getSourceAnchorIndex();
		targetAnchorIndex = transition.getTargetAnchorIndex();

		transition.detachSource();
		transition.detachTarget();

		transition.setSource(oldSource);
		transition.setTarget(oldTarget);
		transition.setSourceAnchorIndex(oldSourceAnchorIndex);
		transition.setTargetAnchorIndex(oldTargetAnchorIndex);

		transition.attachSource();
		transition.attachTarget();
	}


	/**
	 * Returns the transition model part
	 * @return the transition model part
	 */
	public TransitionModelPart getTransition() {
		return transition;
	}

	/**
	 * TODO
	 * @param transition
	 */
	public void setTransition(TransitionModelPart t) {
		transition = t;
		oldSource = t.getSource();
		oldTarget = t.getTarget();
		oldSourceAnchorIndex = t.getSourceAnchorIndex();
		oldTargetAnchorIndex = t.getTargetAnchorIndex();	
	}

	/**
	 * TODO
	 * @return
	 */
	public FlowletModelPart getSource() {
		return source;
	}

	/**
	 * TODO
	 * @param source
	 */
	public void setSource(FlowletModelPart source) {
		this.source = source;
	}

	/**
	 * TODO
	 * @return
	 */
	public FlowletModelPart getTarget() {
		return target;
	}

	/**
	 * TODO
	 * @param target
	 */
	public void setTarget(FlowletModelPart target) {
		this.target = target;
	}

	/**
	 * TODO
	 * @return
	 */
	public int getSourceAnchorIndex() {
		return sourceAnchorIndex;
	}

	/**
	 * TODO
	 * @param sourceAnchorIndex
	 */
	public void setSourceAnchorIndex(int sourceAnchorIndex) {
		this.sourceAnchorIndex = sourceAnchorIndex;
	}

	/**
	 * TODO
	 * @return
	 */
	public int getTargetAnchorIndex() {
		return targetAnchorIndex;
	}

	/**
	 * TODO
	 * @param targetAnchorIndex
	 */
	public void setTargetAnchorIndex(int targetAnchorIndex) {
		this.targetAnchorIndex = targetAnchorIndex;
	}

}