dbforummessage.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.sql.*;
import java.util.*;
import java.text.SimpleDateFormat;

import com.Yasna.forum.*;
import com.Yasna.util.Cacheable;
import com.Yasna.util.CacheSizes;
import com.Yasna.util.StringUtils;

/**
 * Database implementation of the ForumMessage interface. It stores messages
 * in the JiveMessage database table, and message properties in JiveMessageProp
 * table.
 */
public final class DbForumMessage implements ForumMessage, Cacheable {

    /** DATABASE QUERIES **/
    private static final String LOAD_PROPERTIES =
        "SELECT name, propValue FROM yazdMessageProp WHERE messageID=?";
    private static final String DELETE_PROPERTIES =
        "DELETE FROM yazdMessageProp WHERE messageID=?";
    private static final String INSERT_PROPERTY =
        "INSERT INTO yazdMessageProp(messageID,name,propValue) VALUES(?,?,?)";
    private static final String LOAD_MESSAGE =
        "SELECT userID, creationDate, modifiedDate, subject, body, threadID FROM " +
        "yazdMessage WHERE messageID=?";
    private static final String INSERT_MESSAGE =
        "INSERT INTO yazdMessage(messageID, threadID,creationDate,modifiedDate,userID," +
        "subject,body,approved) VALUES(?,?,?,?,?,?,?,1)";
    private static final String SAVE_MESSAGE =
        "UPDATE yazdMessage SET userID=?, subject=?, body=?, creationDate=?, modifiedDate=? " +
        "WHERE messageID=?";
    private static final String GET_FORUM_BY_THREAD =
        "SELECT forumID FROM yazdThread where threadID=?";

    private int id = -1;
    private java.util.Date creationDate;
    private java.util.Date modifiedDate;
    private String subject = "";
    private String body = "";
    private int userID;
    private int threadID;
    private Map properties;
    private Object propertyLock = new Object();
    private ForumFactory factory;
    private ForumThread thread = null;

    /**
     * Indicates if the object is ready to be saved or not. An object is not
     * ready to be saved if it has just been created and has not yet been added
     * to its container. For example, a message added to a thread, etc.
     */
    private boolean isReadyToSave = false;

    /**
     * Creates a new DbForumMessage object.
     */
    protected DbForumMessage(User user, ForumFactory factory) {
        this.id = DbSequenceManager.nextID("ForumMessage");
        long now = System.currentTimeMillis();
        creationDate = new java.util.Date(now);
        modifiedDate = new java.util.Date(now);
        this.userID = user.getID();
        this.factory = factory;
        properties = Collections.synchronizedMap(new HashMap());
    }

    /**
     * Loads the specified DbForumMessage by its message id.
     */
    protected DbForumMessage(int id, DbForumFactory factory)
            throws ForumMessageNotFoundException
    {
        this.id = id;
        this.factory = factory;
        loadFromDb();
        loadProperties();
        isReadyToSave = true;
    }

    //FROM THE FORUMMESSAGE INTERFACE//

    public int getID() {
        return id;
    }

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

    public void setCreationDate(java.util.Date creationDate)
            throws UnauthorizedException
    {
        this.creationDate = creationDate;
        //Only save to the db if the object is read
        if (!isReadyToSave) {
            return;
        }
        saveToDb();
    }

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

    public void setModifiedDate(java.util.Date modifiedDate)
            throws UnauthorizedException
    {
        this.modifiedDate = modifiedDate;
        //Only save to the db if the object is read
        if (!isReadyToSave) {
            return;
        }
        saveToDb();
    }

    public String getSubject() {
        return subject;
    }

    public String getUnfilteredSubject() {
        return subject;
    }

    public void setSubject(String subject) throws UnauthorizedException {
        this.subject = subject;
        //Only save to the db if the object is read
        if (!isReadyToSave) {
            return;
        }
        //Update modifiedDate to the current time.
        modifiedDate.setTime(System.currentTimeMillis());
        saveToDb();
    }

    public String getBody() {
        return body;
    }

    public String getUnfilteredBody() {
        return body;
    }

    public void setBody(String body) throws UnauthorizedException {
        this.body = body;
        //Only save to the db if the object is read
        if (!isReadyToSave) {
            return;
        }
        //Update modifiedDate to the current time.
        modifiedDate.setTime(System.currentTimeMillis());
        saveToDb();
    }

    public User getUser() {
        User user = null;
        try {
            if (userID == -1) {
                user = factory.getProfileManager().getAnonymousUser();
            }
            else {
                user = factory.getProfileManager().getUser(userID);
            }
        }
        catch (UserNotFoundException unfe) {
            unfe.printStackTrace();
        }
        return user;
    }

    public String getProperty(String name) {
        //For security reasons, pass through the HTML filter.
        return StringUtils.escapeHTMLTags((String)properties.get(name));
    }

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

    public void setProperty(String name, String value) {
        properties.put(name, value);
        //Only save to the db if the object is read
        if (!isReadyToSave) {
            return;
        }
        saveProperties();
    }

    public Iterator propertyNames() {
        return Collections.unmodifiableSet(properties.keySet()).iterator();
    }