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.io.File;

 import java.text.ParseException;

 import java.text.SimpleDateFormat;

 import org.apache.commons.lang.StringUtils;

 import org.apache.maven.plugin.AbstractMojo;

 import org.apache.maven.plugin.MojoExecutionException;

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

 /**

  * Goal which checks that the changes.xml file has the necessary data to

  * generate an announcement or a report for the current release.

  * 

  * @goal changes-check

  * @author Justin Edelson

  * @author Dennis Lundberg

  * @since 2.4

  * @threadSafe

  */

 public class ChangesCheckMojo extends AbstractMojo

 {

     /**

      * The format that a correct release date should have. This value will be

      * used as a pattern to try to create a date.

      *

      * @parameter expression="${changes.releaseDateFormat}" default-value="yyyy-MM-dd"

      */

     private String releaseDateFormat;

     /**

      * Version of the artifact.

      *

      * @parameter expression="${changes.version}" default-value="${project.version}"

      * @required

      */

     private String version;

     /**

      * The path of the <code>changes.xml</code> file that will be checked.

      *

      * @parameter expression="${changes.xmlPath}" default-value="src/changes/changes.xml"

      */

     private File xmlPath;

     private ReleaseUtils releaseUtils = new ReleaseUtils( getLog() );

     /**

      * Check that the latest release contains a valid release date.

      *

      * @throws MojoExecutionException

      */

     public void execute()

         throws MojoExecutionException

     {

         if ( xmlPath.exists() )

         {

             ChangesXML xml = new ChangesXML( xmlPath, getLog() );

             Release release = releaseUtils.getLatestRelease( xml.getReleaseList(), version );

             if ( !isValidDate( release.getDateRelease(), releaseDateFormat ) )

             {

                 throw new MojoExecutionException(

                     "The file " + xmlPath.getAbsolutePath() + " has an invalid release date." );

             }

         }

         else

         {

             getLog().warn( "The file " + xmlPath.getAbsolutePath() + " does not exist." );

         }

     }

     /**

      * Use the pattern to try to parse a Date from the given string.

      *

      * @param string A date as text

      * @param pattern A pattern that can be used by {@link SimpleDateFormat}

      * @return <code>true</code> if the string can be parsed as a date using the pattern, otherwise <code>false</code>

      */

     protected static boolean isValidDate( String string, String pattern )

     {

         if ( StringUtils.isEmpty( string ) )

         {

             return false;

         }

         if ( StringUtils.isEmpty( pattern ) )

         {

             return false;

         }

         try

         {

             SimpleDateFormat df = new SimpleDateFormat( pattern );

             df.parse( string );

             return true;

         }

         catch ( ParseException e )

         {

             return false;

         }

     }

 }