blogmanager.java

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/*
 * Copyright (c) 2003-2006, Simon Brown
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - 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.
 *
 *   - Neither the name of Pebble nor the names of its contributors may
 *     be used to endorse or promote products derived from this software
 *     without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS 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 THE COPYRIGHT OWNER OR 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.
 */
package net.sourceforge.pebble.domain;

import net.sourceforge.pebble.PebbleContext;
import net.sourceforge.pebble.util.UpgradeUtilities;
import net.sourceforge.pebble.comparator.BlogByLastModifiedDateComparator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.io.*;
import java.util.*;

/**
 * A singleton to manage the active blog.
 *
 * @author    Simon Brown
 */
public class BlogManager {

  /** the log used by this class */
  private static Log log = LogFactory.getLog(BlogManager.class);

  /** the singleton instance of this class */
  private static BlogManager instance = new BlogManager();

  private static final String THEMES_PATH = "themes";
  private static final String DEFAULT_BLOG = "default";

  /** the blogs that are currently being managed */
  private Map blogs = new HashMap();

  private boolean multiBlog = false;

  /**
   * Creates a new instance - private constructor for the singleton pattern.
   */
  private BlogManager() {
  }

  /**
   * Gets the singleton instance of this class.
   *
   * @return    the singleton BlogManager instance
   */
  public static BlogManager getInstance() {
    return instance;
  }

  /**
   * Gets the default blog.
   *
   * @return    the active Blog instance
   */
  public Blog getBlog() {
    return getBlog(DEFAULT_BLOG);
  }

  /**
   * Gets a named blog. If running in single user mode then this method
   * returns the currently active blog. If running in multi-user mode,
   * this method returns the named blog from the overall composite
   * blog.
   *
   * @param id    the blog ID
   * @return  a Blog instance
   */
  public Blog getBlog(String id) {
    return (Blog)blogs.get(id);
  }

  /**
   * Configures this instance to manage the blog(s) in the specified directory.
   */
  public void startBlogs() {
    File dataDirectory = new File(PebbleContext.getInstance().getConfiguration().getDataDirectory());
    File blogsDirectory = getBlogsDirectory();
    File defaultBlog = new File(blogsDirectory, DEFAULT_BLOG);

    if (!blogsDirectory.exists()) {
      log.info("Pebble blog directory does not exist - creating");
      defaultBlog.mkdirs();
    }

    if (isMultiBlog()) {
      // find all directories and set them up as blogs
      File files[] = getBlogsDirectory().listFiles();
      if (files != null) {
        for (File file : files) {
          if (file.isDirectory()) {
            startBlog(file.getAbsolutePath(), file.getName());
          }
        }
      }
    } else {
      // start the default blog only
      startBlog(defaultBlog.getAbsolutePath(), DEFAULT_BLOG);      
    }
  }

  public void stopBlogs() {
    Blog blog;
    Iterator it = blogs.values().iterator();
    while (it.hasNext()) {
      blog = (Blog)it.next();
      stopBlog(blog);
    }
  }

  private void stopBlog(Blog blog) {
    blog.stop();
  }

  public void reloadBlog(Blog blog) {
    stopBlog(blog);

    File f = new File(getBlogsDirectory(), blog.getId());
    startBlog(f.getAbsolutePath(), blog.getId());
  }

  /**
   * Loads a blog that is a part of a larger composite blog.
   *
   * @param blogDir   the blog.dir for the blog
   * @param blogId    the ID for the blog
   */
  private void startBlog(String blogDir, String blogId) {
    Blog blog = new Blog(blogDir);
    blog.setId(blogId);

    File pathToLiveThemes = new File(PebbleContext.getInstance().getWebApplicationRoot(), THEMES_PATH);
    Theme theme = new Theme(blog, "user-" + blogId, pathToLiveThemes.getAbsolutePath());
    blog.setEditableTheme(theme);

    blog.start();
    blogs.put(blog.getId(), blog);

    // which version are we at and do we need to upgrade?
    File versionFile = new File(blogDir, "pebble.version");
    String blogVersion = null;
    String currentVersion = PebbleContext.getInstance().getBuildVersion();
    try {
      if (versionFile.exists()) {
        BufferedReader reader = new BufferedReader(new FileReader(versionFile));
        blogVersion = reader.readLine();
        reader.close();
      }
    } catch (Exception e) {
      log.error(e);
    }

    try {
      if (blogVersion == null || !blogVersion.equals(currentVersion)) {
        UpgradeUtilities.upgradeBlog(blog, blogVersion, currentVersion);

        BufferedWriter writer = new BufferedWriter(new FileWriter(versionFile));
        writer.write(currentVersion);
        writer.close();

        // now that the upgrade is complete, reload the blog
        reloadBlog(blog);
      }
    } catch (Exception e) {
      log.error(e);
    }
  }

  public void addBlog(String blogId) {
    File file = new File(getBlogsDirectory(), blogId);
    file.mkdirs();
    startBlog(file.getAbsolutePath(), blogId);
  }

  /**
   * Determines whether this blog manager supports multiple blogs.
   *
   * @return  true if multiple blogs are supported, false otherwise
   */
  public boolean isMultiBlog() {
    return this.multiBlog;
  }

  public void setMultiBlog(boolean multiBlog) {
    this.multiBlog = multiBlog;
  }

  public void addBlog(Blog blog) {
    blogs.put(blog.getId(), blog);
  }

  public void removeAllBlogs() {
    blogs = new HashMap();
  }

  /**
   * Gets all blogs that are currently being managed.
   *
   * @return  a Collection of Blog instances
   */
  public Collection getBlogs() {
    List sortedBlogs = new ArrayList(blogs.values());
    Collections.sort(sortedBlogs, new BlogByLastModifiedDateComparator());
    return sortedBlogs;
  }

  /**
   * Gets all blogs that are currently being managed and are
   * to be included in aggregated pages and feeds.
   *
   * @return  a List of Blog instances
   */
  public List<Blog> getPublicBlogs() {
    Collection coll = blogs.values();
    List<Blog> list = new ArrayList<Blog>();
    Iterator it = coll.iterator();
    while (it.hasNext()) {
      Blog blog = (Blog)it.next();
      if (blog.isPublic()) {
        list.add(blog);
      }
    }

    return list;
  }

  /**
   * Determines whether there is a blog with the specified ID.
   *
   * @param id    the blog ID
   * @return  true if a blog with the specified ID exists, false otherwise
   */
  public boolean hasBlog(String id) {
    return blogs.containsKey(id);
  }

  public MultiBlog getMultiBlog() {
    return new MultiBlog(PebbleContext.getInstance().getConfiguration().getDataDirectory());
  }

  private File getBlogsDirectory() {
    return new File(PebbleContext.getInstance().getConfiguration().getDataDirectory(), "blogs");
  }

}