New RSS feed for releases.

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@410401 13f79535-47bb-0310-9956-ffa450edef68

multichanges/src/main/org/apache/maven/plugin/multichanges/util/RssDateFormatter.java

@@ -0,0 +1,56 @@
+package org.apache.maven.plugin.multichanges.util;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+/**
+ * This class provides a method to convert a date in the changes plugin format
+ * (yyyy-MM-dd) to a date in RSS format (RFC 822).
+ * 
+ */
+public class RssDateFormatter {
+	/**
+	 * The date format used in changes report file (changes.xml used in
+	 * maven-changes-plugin).
+	 */
+	private final static SimpleDateFormat changesSDF = new SimpleDateFormat(
+			"yyyy-MM-dd");
+
+	/**
+	 * The date format defined in RFC 822 and used in RSS feeds.
+	 */
+	private final static SimpleDateFormat rfc822DF = new SimpleDateFormat(
+			"EEE, dd MMM yyyy HH:mm:ss Z");
+
+	/**
+	 * Log for debug output
+	 */
+	private static Log log = LogFactory.getLog(RssDateFormatter.class);
+
+	/**
+	 * Converts a date in the changes plugin format (yyyy-MM-dd) to a date in
+	 * RSS format (RFC 822).
+	 * 
+	 * @param changesDate
+	 *            the date to convert
+	 * @return the date in the RFC 822 format. An empty String if an exception
+	 *         occurs.
+	 */
+	public static final String convertDate(final String changesDate) {
+		try {
+			return rfc822DF.format(changesSDF.parse(changesDate));
+		} catch (ParseException e) {
+			if (log.isDebugEnabled())
+				log
+						.error("Unable to convert the date [" + changesDate
+								+ "]", e);
+			else
+				log.error("Unable to convert the date [" + changesDate + "] : "
+						+ e.getMessage());
+			return "";
+		}
+	}
+}

multichanges/src/plugin-resources/releases.jsl

@@ -2,7 +2,7 @@
 <!--
  * ========================================================================
  * 
- * Copyright 2004 The Apache Software Foundation.
+ * Copyright 2004-2006 The Apache Software Foundation.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,8 +24,12 @@
       <properties>
         <title>Latest releases</title>
       </properties>
+      <head>
+        <link rel="alternative" href="releases.rss" type="application/rss+xml" />
+      </head>
       <body>
         <section name="Latest releases">
+          <p>Get the RSS feed of the last releases <a href="releases.rss"><img src="images/rss.png"/></a></p>
           <table>
             <tr>
               <th>Project name</th>

multichanges/src/plugin-resources/releases2rss.jsl

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ * ========================================================================
+ * 
+ * Copyright 2006 The Apache Software Foundation.
+ *
+ * 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.
+ * 
+ * ========================================================================
+-->
+<jsl:stylesheet select="$doc" xmlns:jsl="jelly:jsl" xmlns:x="jelly:xml" xmlns:j="jelly:core" xmlns="dummy" trim="false">
+  <!-- This needs to be instantiated here to be available in the template matches -->
+  <j:useBean var="rssDateFormatter" class="org.apache.maven.plugin.multichanges.util.RssDateFormatter"/>
+  <jsl:template match="releases">
+    <rss version="2.0">
+      <channel>
+        <title>${pom.name} releases</title>
+        <link>${pom.url}</link>
+        <description>${pom.name} releases</description>
+        <lastBuildDate>${currentDate}</lastBuildDate>
+        <language>en-us</language>
+        <copyright>Copyright ${currentYear} ${pom.organization.name}</copyright>
+        <x:set var="projects" sort="@date" descending="true" select="project[not(@date = 'Not released') and not(@date = 'No information available')]"/>
+        <j:forEach var="project" items="${projects}">
+          <j:set var="baseUrl"><x:expr select="$project/@url"/></j:set>
+          <j:set var="version"><x:expr select="$project/@version"/></j:set>
+          <j:set var="date"><x:expr select="$project/@date"/></j:set>
+        <item>
+          <title><x:expr select="$project/@name"/> <x:expr select="$project/@version"/> released.</title>
+          <link>${baseUrl}/announcements/announcement-${version}.txt</link>
+          <guid>${baseUrl}/announcements/announcement-${version}.txt</guid>
+    			<pubDate>${rssDateFormatter.convertDate(date)}</pubDate>
+        </item>
+        </j:forEach>
+      </channel>
+    </rss>
+  </jsl:template>
+</jsl:stylesheet>