modelpropertycommand.java

mywork是rcp开发的很好的例子

package net.sf.freenote.commands;

import net.sf.freenote.model.ModelElement;

import org.eclipse.gef.commands.Command;

/**
 * 改变model单一属性的命令，多属性可以组合此命令
 * @author levin
 * @since 2008-1-26 下午01:33:43
 */
public class ModelPropertyCommand extends Command {
	private Object newValue, oldValue;
	private ModelElement model;
	private String property;
	public ModelPropertyCommand(ModelElement modle, Object newValue,String property) {
		super();
		this.model = modle;
		this.newValue = newValue;
		this.property=property;
	}
	
	public void execute() {
		oldValue = model.getPropertyValue(property);
		redo();
	}

	@Override
	public void redo() {
		model.setPropertyValue(property, newValue);
	}

	public void undo() {
		model.setPropertyValue(property, oldValue);
	}
}