package org.apache.maven.archiver;
   
   /*
    * 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.BufferedReader;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.PrintWriter;
  import java.io.StringReader;
  import java.io.StringWriter;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import java.util.Properties;
  
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.shared.utils.io.IOUtil;
  import org.codehaus.plexus.archiver.Archiver;
  
  /**
   * This class is responsible for creating the <code>pom.properties</code> file
   * in <code>META-INF/maven/${groupId}/${artifactId}</code>.
   */
  public class PomPropertiesUtil
  {
      private Properties loadPropertiesFile( File file )
          throws IOException
      {
          Properties fileProps = new Properties();
          InputStream istream = null;
          try
          {
              istream = new FileInputStream( file );
              fileProps.load( istream );
              istream.close();
              istream = null;
              return fileProps;
          }
          finally
          {
              IOUtil.close( istream );
          }
      }
  
      private boolean sameContents( Properties props, File file )
          throws IOException
      {
          if ( !file.isFile() )
          {
              return false;
          }
  
          Properties fileProps = loadPropertiesFile( file );
          return fileProps.equals( props );
      }
  
      private void createPropertiesFile( MavenSession session, Properties properties, File outputFile,
                                         boolean forceCreation )
          throws IOException
      {
          File outputDir = outputFile.getParentFile();
          if ( outputDir != null && !outputDir.isDirectory() && !outputDir.mkdirs() )
          {
              throw new IOException( "Failed to create directory: " + outputDir );
          }
          if ( !forceCreation && sameContents( properties, outputFile ) )
          {
              return;
          }
          PrintWriter pw = new PrintWriter( outputFile, "ISO-8859-1" );
          try
          {
              StringWriter sw = new StringWriter();
              properties.store( sw, null );
  
              BufferedReader r = new BufferedReader( new StringReader( sw.toString() ) );
  
              List<String> lines = new ArrayList<String>();
              String line;
             while ( ( line = r.readLine() ) != null )
             {
                 if ( !line.startsWith( "#" ) )
                 {
                     lines.add( line );
                 }
             }
 
             r.close();
             r = null;
             sw.close();
             sw = null;
 
             Collections.sort( lines );
             for ( String l : lines )
             {
                 pw.println( l );
             }
 
             pw.close();
             pw = null;
         }
         finally
         {
             IOUtil.close( pw );
         }
     }
 
     /**
      * Creates the pom.properties file.
      * @param session {@link MavenSession}
      * @param project {@link MavenProject}
      * @param archiver {@link Archiver}
      * @param customPomPropertiesFile optional custom pom properties file
      * @param pomPropertiesFile The pom properties file.
      * @param forceCreation force creation true/false
      * @throws org.codehaus.plexus.archiver.ArchiverException archiver exception.
      * @throws IOException IO exception.
      */
     public void createPomProperties( MavenSession session, MavenProject project, Archiver archiver,
                                      File customPomPropertiesFile, File pomPropertiesFile, boolean forceCreation )
         throws IOException
     {
         final String groupId = project.getGroupId();
         final String artifactId = project.getArtifactId();
         final String version = project.getVersion();
 
         Properties p;
 
         if ( customPomPropertiesFile != null )
         {
             p = loadPropertiesFile( customPomPropertiesFile );
         }
         else
         {
             p = new Properties();
         }
 
         p.setProperty( "groupId", groupId );
 
         p.setProperty( "artifactId", artifactId );
 
         p.setProperty( "version", version );
 
         createPropertiesFile( session, p, pomPropertiesFile, forceCreation );
 
         archiver.addFile( pomPropertiesFile, "META-INF/maven/" + groupId + "/" + artifactId + "/pom.properties" );
     }
 }