deletefileaction.java

该系统是一个基于p2p的即时聊天系统

/*
 * @(#) DeleteFileAction.java
 * Copyright 2004 HWStudio. All rights reserved.
 */
package hws.item.smart.action.share.upload;
//导入核心Java类库
import java.awt.event.ActionEvent;
import java.util.List;
import java.util.zip.ZipEntry;
import javax.swing.JOptionPane;
import javax.swing.tree.DefaultMutableTreeNode;
//导入自定义Java类库
import hws.item.smart.Smart;
import hws.item.smart.misc.StringShop;
import hws.item.smart.panel.function.chat.ViewPanel;
import hws.item.smart.panel.function.share.UploadPanel;
import hws.item.smart.action.BaseAction;
import hws.item.smart.utility.chat.UserInfo;
/**
 * 删除选中的文件或者目录
 *
 * @version 0.1 2005-08-29
 * @author Hwerz
 */
public class DeleteFileAction extends BaseAction {
    /*------------------------------------------------------------------------*
     *                                属性定义                                *
     *------------------------------------------------------------------------*/
    /**
     * 该类自身的一个静态引用
     */
    private static DeleteFileAction action;
    /*------------------------------------------------------------------------*
     *                                构造函数                                *
     *------------------------------------------------------------------------*/
    /**
     * 构造函数为私有，这样在整个运行过程中该类就只能有一个实例
     */
    private DeleteFileAction() {
        super("删除文件");
        setHintInfo("删除选中的文件或者目录");
        setEnabled(false);
    }
    /*------------------------------------------------------------------------*
     *                                公共方法                                *
     *------------------------------------------------------------------------*/
    /**
     * 对该类提供的一个全局访问点，用来实例化该对象
     *
     * @return 该类唯一的一个实例
     */
    public static DeleteFileAction getInstance() {
        if (action == null) {
            action = new DeleteFileAction();
        }
        return action;
    }
    /*------------------------------------------------------------------------*
     *                                私有方法                                *
     *------------------------------------------------------------------------*/
    /**
     * 删除
     */
    private void delete() {
        DefaultMutableTreeNode n = UploadPanel.getInstance().getSelectedNode();
        ZipEntry entry = (ZipEntry) n.getUserObject();
        String answer = "您真的确定要删除选中的文件吗？";
        if (entry.isDirectory()) {
            answer = "您真的确定要删除选中的目录吗？";
        }
        int option = JOptionPane.showConfirmDialog(Smart.getInstance(), answer,
            StringShop.HINT_TITLE, JOptionPane.OK_CANCEL_OPTION,
            JOptionPane.QUESTION_MESSAGE);
        if (option == JOptionPane.OK_OPTION) {
            UploadPanel.getInstance().deleteFile();
        }
    }
    /*------------------------------------------------------------------------*
     *                                覆盖方法                                *
     *------------------------------------------------------------------------*/
    /**
     * 覆盖超类Action的方法
     *
     * @param event ActionEvent对象
     */
    public void actionPerformed(ActionEvent event) {
        String id = ViewPanel.getInstance().getUserID();
        if (id.length() > 0) {
            UserInfo user = UserInfo.getRemoteUserInfo(id);
            List files = user.getSharesInfo().getAllShareFiles();
            String file = UploadPanel.getInstance().getSelectedFile();
            boolean shared = false;
            for (int i = 0; i < files.size(); i++) {
                String file2 = files.get(i).toString();
                if (file2.indexOf(file) != -1) {
                    shared = true;
                    break;
                }
            }
            if (shared) {
                JOptionPane.showMessageDialog(Smart.getInstance(),
                    "不能删除共享文件及其所在的目录，除非先取消文件的共享属性！",
                    StringShop.HINT_TITLE, JOptionPane.INFORMATION_MESSAGE);
            } else {
                delete();
            }
        } else {
            JOptionPane.showMessageDialog(Smart.getInstance(),
                "您还没有登录，请先登录！", StringShop.HINT_TITLE,
                JOptionPane.INFORMATION_MESSAGE);
        }
    }
}