/* * @(#) FriendHandler.java * Copyright 2004 HWStudio. All rights reserved. */package hws.item.smart.utility.admin;//導入核心Java類庫import java.io.IOException;import java.io.StringReader;import java.util.List;//導入第三方Java類庫import org.jdom.Element;import org.jdom.Document;import org.jdom.JDOMException;import org.jdom.input.SAXBuilder;import org.jdom.output.XMLOutputter;/** * 好友處理器 * * @version 0.1 2005-08-06 * @author Hwerz */public class FriendHandler extends Object {    /*------------------------------------------------------------------------*     *                                公共方法                                *     *------------------------------------------------------------------------*/    /**     * 好友信息     *     * @param requestMsg 好友信息的請求信息     * @return 好友信息的響應信息     */    public String friend(String requestMsg) {        Element response = new Element("Response");        try {            SAXBuilder builder = new SAXBuilder();            StringReader reader = new StringReader(requestMsg);            Document document = builder.build(reader);            Element request = document.getRootElement();            String id = request.getChild("ID").getText();            List ids = XMLAccessor.getAllUsersID();            for (int i = 0; i < ids.size(); i++) {                String id2 = ids.get(i).toString();                if (id2.equals(id) == false && isMyFriend(id2, id) == false) {                    response.addContent(XMLAccessor.getUserElement(id2, true));                }            }        } catch (JDOMException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        XMLOutputter outputter = new XMLOutputter();        return outputter.outputString(new Document(response));    }    /*------------------------------------------------------------------------*     *                                私有方法                                *     *------------------------------------------------------------------------*/    /**     * 判斷第一個用戶是否是第二個用戶的好友，如果是則返回true，否則返回false     *     * @param id1 第一個用戶     * @param id2 第二個用戶     * @return 如果第一個用戶是第二個用戶的好友則返回true，否則返回false     */    private boolean isMyFriend(String id1, String id2) {        boolean is = false;        List friends = XMLAccessor.getAllFriends(id2);        for (int i = 0; i < friends.size(); i++) {            if (friends.get(i).equals(id1) == true) {                is = true;                break;            }        }        return is;    }}