connectiondeletecommand.java

对eclipse gef进行封装,可以生成图形化编辑器

/*******************************************************************************
 * $Header: /cvsroot/EOS6/work_dir/niegy/com.primeton.studio.gef.ui/src/com/primeton/studio/gef/ui/commands/ConnectionDeleteCommand.java,v 1.3 2006/12/20 02:57:07 niegy Exp $
 * $Revision: 1.3 $
 * $Date: 2006/12/20 02:57:07 $
 *
 *==============================================================================
 *
 * Copyright (c) 2001-2006 Primeton Technologies, Ltd.
 * All rights reserved. 
 * 
 * Created on 2006-11-1
 *******************************************************************************/


package com.primeton.studio.gef.ui.commands;

import java.util.List;

import org.eclipse.gef.commands.Command;
import org.eclipse.ui.part.FileEditorInput;

import com.primeton.studio.gef.core.Connection;
import com.primeton.studio.gef.ui.editor.AbstractGraphicalEditor;
import com.primeton.studio.gef.ui.parts.ExtenderReader;

/**
 * TODO此处填写 class 信息
 *
 * @author niegy (mailto:[e-mail])
 */
/*
 * 修改历史
 * $Log: ConnectionDeleteCommand.java,v $
 * Revision 1.3  2006/12/20 02:57:07  niegy
 * 重构代码
 *
 * Revision 1.2  2006/12/08 07:04:32  niegy
 * 重构代码
 *
 * Revision 1.1  2006/11/17 03:15:13  niegy
 * create
 * 
 */
public class ConnectionDeleteCommand extends Command {
    /** Connection instance to disconnect. */
    protected final Connection connection;
   
    private String pathName;
    private AbstractGraphicalEditor graphicalEditor;
    /** 
     * Create a command that will disconnect a connection from its endpoints.
     * @param conn the connection instance to disconnect (non-null)
     * @throws IllegalArgumentException if conn is null
     */ 
    public ConnectionDeleteCommand(Connection conn,AbstractGraphicalEditor graphicalEditor) {
        if (conn == null) {
            throw new IllegalArgumentException();
        }
        setLabel("connection deletion");
        this.connection = conn;
        this.graphicalEditor = graphicalEditor;
        pathName = ((FileEditorInput)graphicalEditor.getEditorInput()).getFile().getFullPath().toOSString();
    }
    
    /* (non-Javadoc)
     * @see org.eclipse.gef.commands.Command#execute()
     */
    public void execute() {   
        connection.getSourceNode().getSourceConnections().remove(connection);
        connection.getTargetNode().getTargetConnections().remove(connection);
        List<String> list =  ExtenderReader.getInstance().getLinkIdList(graphicalEditor.getPluginId()+pathName);
        list.remove(connection.getId());
    }
       
    /* (non-Javadoc)
     * @see org.eclipse.gef.commands.Command#undo()
     */
    public void undo() {
        connection.getSourceNode().getSourceConnections().add(connection);
        connection.getTargetNode().getTargetConnections().add(connection);
        List<String> list =  ExtenderReader.getInstance().getLinkIdList(graphicalEditor.getPluginId()+pathName);
        list.add(connection.getId());
    }
}