dbforum.java

这是学习Java必须读懂两套源代码

/**
 * Copyright (C) 2001 Yasna.com. All rights reserved.
 *
 * ===================================================================
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by
 *        Yasna.com (http://www.yasna.com)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Yazd" and "Yasna.com" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please
 *    contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Yazd",
 *    nor may "Yazd" appear in their name, without prior written
 *    permission of Yasna.com.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 YASNA.COM OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Yasna.com. For more information
 * on Yasna.com, please see <http://www.yasna.com>.
 */

/**
 * Copyright (C) 2000 CoolServlets.com. All rights reserved.
 *
 * ===================================================================
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. 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.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by
 *        CoolServlets.com (http://www.coolservlets.com)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Jive" and "CoolServlets.com" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please
 *    contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Jive",
 *    nor may "Jive" appear in their name, without prior written
 *    permission of CoolServlets.com.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 COOLSERVLETS.COM OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of CoolServlets.com. For more information
 * on CoolServlets.com, please see <http://www.coolservlets.com>.
 */

package com.Yasna.forum.database;

import java.util.Iterator;
import java.util.Enumeration;
import java.util.Properties;
import java.util.ArrayList;
import java.util.Date;
import java.sql.*;
import java.io.*;

import com.Yasna.forum.*;
import com.Yasna.forum.filter.*;
import com.Yasna.util.Cache;
import com.Yasna.util.Cacheable;
import com.Yasna.util.CacheSizes;

/**
 * Database implementation of the Forum interface. It loads and stores forum
 * information from a a database.
 *
 * @see Forum
 */
public class DbForum implements Forum, Cacheable {

    /** DATABASE QUERIES **/
    private static final String ADD_THREAD =
        "UPDATE yazdThread set forumID=? WHERE threadID=?";
    protected static final String DELETE_THREAD = "DELETE FROM yazdThread WHERE threadID=?";
    private static final String THREAD_COUNT =
        "SELECT count(*) FROM yazdThread WHERE forumID=?";
    private static final String MESSAGE_COUNT =
        "SELECT count(*) FROM yazdThread, yazdMessage WHERE " +
        "yazdThread.forumID=? AND yazdThread.threadID=yazdMessage.threadID";
    private static final String ADD_USER_PERM =
        "INSERT INTO yazdUserPerm(forumID,userID,permission) VALUES(?,?,?)";
    private static final String REMOVE_USER_PERM =
        "DELETE FROM yazdUserPerm WHERE forumID=? AND userID=? AND permission=?";
    private static final String USERS_WITH_PERM =
        "SELECT DISTINCT userID FROM yazdUserPerm WHERE forumID=? AND permission=?";
    private static final String ADD_GROUP_PERM =
        "INSERT INTO yazdGroupPerm(forumID,groupID,permission) VALUES(?,?,?)";
    private static final String REMOVE_GROUP_PERM =
        "DELETE FROM yazdGroupPerm WHERE forumID=? AND groupID=? AND permission=?";
    private static final String GROUPS_WITH_PERM =
        "SELECT DISTINCT groupID FROM yazdGroupPerm WHERE forumID=? AND permission=?";
    private static final String LOAD_FILTERS =
        "SELECT filterObject, filterIndex FROM yazdFilter WHERE forumID=? ORDER BY filterIndex ASC";
    private static final String DELETE_FILTERS = "DELETE FROM yazdFilter WHERE forumID=?";
    private static final String ADD_FILTER =
        "INSERT INTO yazdFilter(forumID,filterIndex,filterObject) VALUES(?,?,?)";
    private static final String LOAD_PROPERTIES =
        "SELECT name, propValue FROM yazdForumProp WHERE forumID=?";
    private static final String DELETE_PROPERTIES =
        "DELETE FROM yazdForumProp WHERE forumID=?";
    private static final String INSERT_PROPERTY =
        "INSERT INTO yazdForumProp(forumID,name,propValue) VALUES(?,?,?)";
    private static final String LOAD_FORUM_BY_ID =
        "SELECT forumID, name, description, creationDate, modifiedDate, moderated FROM yazdForum WHERE forumID=?";
    private static final String LOAD_FORUM_BY_NAME =
        "SELECT forumID, name, description, creationDate, modifiedDate, moderated FROM yazdForum WHERE name=?";
    private static final String ADD_FORUM =
        "INSERT INTO yazdForum(forumID, name, description, creationDate, " +
        "modifiedDate, moderated) VALUES (?,?,?,?,?,?)";
    private static final String SAVE_FORUM =
        "UPDATE yazdForum SET name=?, description=?, creationDate=?, " +
        "modifiedDate=?, moderated=? WHERE forumID=?";
    private static final String UPDATE_FORUM_MODIFIED_DATE =
        "UPDATE yazdForum SET modifiedDate=? WHERE forumID=?";

    private int id = -1;
    private String name;
    private String description;
    private java.util.Date creationDate;
    private java.util.Date modifiedDate;
    private int moderated = 0;
    private ForumMessageFilter[] filters;
    private Properties properties;
    //Lock for saving state to database.
    private Object saveLock = new Object();

    private DbForumFactory factory;

    /**
     * Creates a new forum with the specified name and description.
     *
     * @param name the name of the forum.
     * @param description the description of the forum.
     * @param factory the DbForumFactory the forum is a part of.
     */
    protected DbForum(String name, String description, DbForumFactory factory) {
        this.id = DbSequenceManager.nextID("Forum");
        this.name = name;
        this.description = description;
        long now = System.currentTimeMillis();
        creationDate = new java.util.Date(now);
        modifiedDate = new java.util.Date(now);
        this.factory = factory;
        insertIntoDb();
        properties = new Properties();
        //Forums should start with an html filter by default for
        //security purposes.
        filters = new ForumMessageFilter[2];
        filters[0] = new FilterHtml();
        filters[1] = new FilterNewline();
        saveFiltersToDb();
        //**Commenting out below since it doesn't seem to work for some reason.
        //try {
        //    addForumMessageFilter(new FilterHtml(), 0);
        //    addForumMessageFilter(new FilterNewline(), 1);
        //}
        //catch (UnauthorizedException ue) {
        //     ue.printStackTrace();
        //}
    }

    /**
     * Loads a forum with the specified id.
     */
    protected DbForum(int id, DbForumFactory factory)
            throws ForumNotFoundException
    {
        this.id = id;
        this.factory = factory;
        loadFromDb();
        loadFiltersFromDb();
        loadProperties();
    }

    /**
     * Loads a forum with the specified name.
     */
    protected DbForum(String name, DbForumFactory factory)
            throws ForumNotFoundException
    {
        this.name = name;
        this.factory = factory;
        loadFromDb();
        loadFiltersFromDb();
        loadProperties();
    }

    //FROM THE FORUM INTERFACE//

    public int getID() {
        return id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) throws UnauthorizedException {
        this.name = name;
        saveToDb();
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) throws UnauthorizedException
    {
        this.description = description;
        saveToDb();
    }

    public java.util.Date getCreationDate() {
        return creationDate;
    }

    public void setCreationDate(java.util.Date creationDate)
            throws UnauthorizedException
    {
       this.creationDate = creationDate;
       saveToDb();
    }

    public java.util.Date getModifiedDate() {
        return modifiedDate;
    }

    public void setModifiedDate(java.util.Date modifiedDate)
            throws UnauthorizedException
    {
        this.modifiedDate = modifiedDate;
        saveToDb();
    }

    public String getProperty(String name) {
        return (String)properties.get(name);
    }

    public void setProperty(String name, String value)
            throws UnauthorizedException
    {
        properties.put(name, value);
        saveProperties();
    }

    public Enumeration propertyNames() {
        return properties.keys();
    }

    public boolean isModerated(int type) {
        return false;
        //if (type == Forum.THREAD) {
        //    return threadsModerated;
        //}
        //else {
        //    return messagesModerated;
        //}
    }

    public void setModerated(int type, boolean moderated)
            throws UnauthorizedException