package org.apache.maven.plugin.changes;

 /*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements.  See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership.  The ASF licenses this file

  * to you 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.

  */

 import java.util.ArrayList;

 import java.util.Collections;

 import java.util.Iterator;

 import java.util.List;

 import org.apache.maven.plugin.MojoExecutionException;

 import org.apache.maven.plugin.logging.Log;

 import org.apache.maven.plugins.changes.model.Action;

 import org.apache.maven.plugins.changes.model.Release;

 /**

  * A utility class for working with Release objects.

  *

  * @author Dennis Lundberg

  * @version $Id: org.apache.maven.plugin.changes.ReleaseUtils.html 816601 2012-05-08 12:50:18Z hboutemy $

  * @since 2.4

  */

 public class ReleaseUtils

 {

     private static final String SNAPSHOT_SUFFIX = "-SNAPSHOT";

     private Log log;

     public ReleaseUtils( Log log )

     {

         this.log = log;

     }

     /**

      * Get the latest release by matching the supplied releases

      * with the version from the pom.

      *

      * @param releases list of releases

      * @param pomVersion Version of the artifact

      * @return A <code>Release</code> that matches the next release of the current project

      * @throws org.apache.maven.plugin.MojoExecutionException If a release can't be found

      */

     public Release getLatestRelease( List<Release> releases, String pomVersion )

         throws MojoExecutionException

     {

         // Remove "-SNAPSHOT" from the end, if it's there

         if ( pomVersion != null && pomVersion.endsWith( SNAPSHOT_SUFFIX ) )

         {

             pomVersion = pomVersion.substring( 0, pomVersion.length() - SNAPSHOT_SUFFIX.length() );

         }

         getLog().debug( "Found " + releases.size() + " releases." );

         Release release = getRelease( releases, pomVersion );

         if ( release == null )

         {

             throw new MojoExecutionException( "Couldn't find the release '" + pomVersion

                 + "' among the supplied releases." );

         }

         return release;

     }

     private Log getLog()

     {

         return log;

     }

     /**

      * Get a release with the specified version from the list of releases.

      *

      * @param releases A list of releases

      * @param version The version we want

      * @return A Release, or null if no release with the specified version can be found

      */

     protected Release getRelease( List<Release> releases, String version )

     {

         for ( Release release : releases )

         {

             if ( getLog().isDebugEnabled() )

             {

                 getLog().debug( "The release: " + release.getVersion()

                     + " has " + release.getActions().size() + " actions." );

             }

             if ( release.getVersion() != null && release.getVersion().equals( version ) )

             {

                 if ( getLog().isDebugEnabled() )

                 {

                     getLog().debug( "Found the correct release: " + release.getVersion() );

                     logRelease( release );

                 }

                 return release;

             }

         }

         return null;

     }

     protected void logRelease( Release release )

     {

         Action action;

         for ( Iterator iterator = release.getActions().iterator(); iterator.hasNext(); )

         {

             action = (Action) iterator.next();

             getLog().debug( "o " + action.getType() );

             getLog().debug( "issue : " + action.getIssue() );

             getLog().debug( "action : " + action.getAction() );

             getLog().debug( "dueTo : " + action.getDueTo() );

         }

     }

     /**

      * Merge releases from one issue tracker with releases from another issue

      * tracker. If a release is found in both issue trackers, i.e. they have

      * the same version, their issues are merged into one release.

      *

      * @param firstReleases Releases from the first issue tracker

      * @param secondReleases Releases from the second issue tracker

      * @return A list containing the merged releases

      */

     public List<Release> mergeReleases( final List<Release> firstReleases, final List<Release> secondReleases )

     {

         if ( firstReleases == null && secondReleases == null )

         {

             return Collections.emptyList();

         }

         if ( firstReleases == null )

         {

             return secondReleases;

         }

         if ( secondReleases == null )

         {

             return firstReleases;

         }

         List<Release> mergedReleases = new ArrayList<Release>();

         // Loop through the releases from the first issue tracker, merging in

         // actions from releases with the same version from the second issue

         // tracker

         for ( Release firstRelease : firstReleases )

         {

             Release secondRelease = getRelease( secondReleases, firstRelease.getVersion() );

             if ( secondRelease != null )

             {

                 if ( secondRelease.getActions() != null )

                 {

                     firstRelease.getActions().addAll( secondRelease.getActions() );

                 }

             }

             mergedReleases.add( firstRelease );

         }

         // Handle releases that are only in the second issue tracker

         for ( Release secondRelease : secondReleases )

         {

             Release mergedRelease = getRelease( mergedReleases, secondRelease.getVersion() );

             if ( mergedRelease == null )

             {

                 mergedReleases.add( secondRelease );

             }

         }

         return mergedReleases;

     }

     /**

      * Convert an untyped List of Release objects that comes from changes.xml

      * into a typed List of Release objects.

      *

      * @param changesReleases An untyped List of Release objects

      * @return A type List of Release objects

      * @todo When Modello can generate typed collections this method is no longer needed

      */

     public List<Release> convertReleaseList( List changesReleases ) {

         List<Release> releases = new ArrayList<Release>();

         // Loop through the List of releases from changes.xml and casting each

         // release to a Release

         for ( Iterator iterator = changesReleases.iterator(); iterator.hasNext(); )

         {

             Release release = (Release) iterator.next();

             releases.add( release );

         }

         return releases;

     }

 }