SaveForumPostCommand.java

/*
 * Copyright 2008 Jeff Dwyer
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.apress.progwt.client.domain.commands;

import java.io.Serializable;

import com.allen_sauer.gwt.log.client.Log;
import com.apress.progwt.client.domain.ForumPost;
import com.apress.progwt.client.domain.User;
import com.apress.progwt.client.domain.forum.ForumTopic;
import com.apress.progwt.client.exception.SiteException;

/**
 * Because this will reference many objects that are stored in the DB, we
 * need to do loads on all of those objects in order to ensure that we
 * don't get 'multiple obejcts in the session' errors from hibernate.
 * 
 * Take care of those loads using the AbstractCommand pattern that we've
 * developed.
 * 
 * If it's an edit, we need to be sure to copy over all important,
 * changable fields to the toSave object which we'll retrieve from the DB.
 * 
 * @author Jeff Dwyer
 * 
 */
public class SaveForumPostCommand extends AbstractCommand implements
        Serializable {

    private ForumPost forumPost;

    private long authorID;

    private long topicID = -1;

    private long threadID = -1;

    private ForumPost toSave;

    public SaveForumPostCommand() {
    }

    public SaveForumPostCommand(ForumPost forumPost) {
        super(forumPost, forumPost.getAuthor(), forumPost.getTopic(),
                forumPost.getThreadPost());

        this.forumPost = forumPost;
        this.topicID = forumPost.getTopic().getId();
        this.authorID = forumPost.getAuthor().getId();

        if (forumPost.getThreadPost() != null) {
            this.threadID = forumPost.getThreadPost().getId();
        }
    }

    @Override
    public String toString() {
        return "SaveForumPostCommand ForumPost " + forumPost;
    }

    public boolean haveYouSecuredYourselfAndFilteredUserInput() {
        return true;
    }

    public void execute(CommandService commandService)
            throws SiteException {

        User author = commandService.get(User.class, authorID);

        commandService.assertUserIsAuthenticated(author);

        ForumTopic loadedTopic = commandService.get(forumPost
                .getTopicClass(), topicID);
        ForumPost threadP = commandService.get(ForumPost.class, threadID);

        Log.debug("SaveForumPostCommand" + toString());

        toSave = commandService.get(ForumPost.class, forumPost.getId());

        // if it's a new creation, just use the one we wanted to save
        if (toSave == null) {
            toSave = forumPost;
        } else {
            // Post edit. Assert that this post is actually ours to edit
            commandService.assertUserIsAuthenticated(toSave.getAuthor());
        }

        toSave.setAuthor(author);
        toSave.setTopic(loadedTopic);
        toSave.setThreadPost(threadP);

        toSave.setDate(forumPost.getDate());
        toSave.setPostString(commandService.filterHTML(forumPost
                .getPostString()));
        toSave.setPostTitle(commandService.filterHTML(forumPost
                .getPostTitle()));

        // update the inverse side of the relationship
        if (threadP != null) {
            threadP.getReplies().add(toSave);
        }

        commandService.save(toSave);

    }

    /**
     * used in testing accessor
     * 
     * @return
     */
    public ForumPost getToSave() {
        return toSave;
    }

}