/*

  * Copyright (c) 2003-2011, 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.permalink;

 import net.sourceforge.pebble.domain.Blog;

 import net.sourceforge.pebble.domain.BlogEntry;

 import net.sourceforge.pebble.domain.BlogService;

 import net.sourceforge.pebble.domain.BlogServiceException;

 import java.text.DateFormat;

 import java.text.SimpleDateFormat;

 import java.util.Date;

 /**

  * Generates permalinks using the pattern /YYYY/MM/DD/<time-in-millis>.

  *

  * @author Simon Brown

  */

 public class DefaultPermalinkProvider extends PermalinkProviderSupport {

   /** the regex used to check for a blog entry permalink : /yyyy/mm/dd/blogentryid.html */

   private static final String BLOG_ENTRY_PERMALINK_REGEX = "/\\d\\d\\d\\d/\\d\\d/\\d\\d/\\d*.html";

   /**

    * Gets the permalink for a blog entry.

    *

    * @return  a URI as a String

    */

   public String getPermalink(BlogEntry blogEntry) {

     Blog blog = blogEntry.getBlog();

     Date date = blogEntry.getDate();

     DateFormat year = new SimpleDateFormat("yyyy");

     year.setTimeZone(blog.getTimeZone());

     DateFormat month = new SimpleDateFormat("MM");

     month.setTimeZone(blog.getTimeZone());

     DateFormat day = new SimpleDateFormat("dd");

     day.setTimeZone(blog.getTimeZone());

     StringBuffer buf = new StringBuffer();

     buf.append("/");

     buf.append(year.format(date));

     buf.append("/");

     buf.append(month.format(date));

     buf.append("/");

     buf.append(day.format(date));

     buf.append("/");

     buf.append(blogEntry.getId());

     buf.append(".html");

     return buf.toString();

   }

   /**

    * Determines whether the specified URI is a blog entry permalink.

    *

    * @param uri   a relative URI

    * @return      true if the URI represents a permalink to a blog entry,

    *              false otherwise

    */

   public boolean isBlogEntryPermalink(String uri) {

     if (uri != null) {

       return uri.matches(BLOG_ENTRY_PERMALINK_REGEX);

     } else {

       return false;

     }

   }

   /**

    * Gets the blog entry referred to by the specified URI.

    *

    * @param uri   a relative URI

    * @return  a BlogEntry instance, or null if one can't be found

    */

   public BlogEntry getBlogEntry(String uri) {

     Blog blog = getBlog();

     BlogService service = new BlogService();

     try {

       return service.getBlogEntry(blog, uri.substring(12, uri.lastIndexOf(".")));

     } catch (BlogServiceException e) {

       return null;

     }

   }

 }