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.File;
  import java.io.FileInputStream;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.util.Properties;
  
  import org.apache.maven.project.MavenProject;
  import org.codehaus.plexus.archiver.Archiver;
  import org.codehaus.plexus.archiver.ArchiverException;
  import org.apache.maven.shared.utils.io.IOUtil;
  
  /**
   * This class is responsible for creating the pom.properties file.
   * 
   * @version $Id: PomPropertiesUtil.java 1634984 2014-10-28 21:01:38Z khmarbaise $
   */
  public class PomPropertiesUtil
  {
      private static final String GENERATED_BY_MAVEN = "Generated by Apache Maven";
  
      private boolean sameContents( Properties props, File file )
          throws IOException
      {
          if ( !file.isFile() )
          {
              return false;
          }
          Properties fileProps = new Properties();
          InputStream istream = null;
          try
          {
              istream = new FileInputStream( file );
              fileProps.load( istream );
              istream.close();
              istream = null;
              return fileProps.equals( props );
          }
          catch ( IOException e )
          {
              return false;
          }
          finally
          {
              IOUtil.close( istream );
          }
      }
  
      private void createPropertyFile( 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;
          }
          OutputStream os = new FileOutputStream( outputFile );
          try
          {
              properties.store( os, GENERATED_BY_MAVEN );
              os.close(); // stream is flushed but not closed by Properties.store()
              os = null;
          }
          finally
          {
              IOUtil.close( os );
          }
      }
  
      /**
       * Creates the pom.properties file.
       * @param project {@link MavenProject}
       * @param archiver {@link Archiver}
      * @param pomPropertiesFile The pom properties file.
      * @param forceCreation force creation true/flas.e
      * @throws ArchiverException archiver exception.
      * @throws IOException IO exception.
      */
     public void createPomProperties( MavenProject project, Archiver archiver, File pomPropertiesFile,
                                      boolean forceCreation )
         throws ArchiverException, IOException
     {
         final String artifactId = project.getArtifactId();
         final String groupId = project.getGroupId();
 
         Properties p = new Properties();
 
         p.setProperty( "groupId", project.getGroupId() );
 
         p.setProperty( "artifactId", project.getArtifactId() );
 
         p.setProperty( "version", project.getVersion() );
 
         createPropertyFile( p, pomPropertiesFile, forceCreation );
 
         archiver.addFile( pomPropertiesFile, "META-INF/maven/" + groupId + "/" + artifactId + "/pom.properties" );
     }
 }