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.execution.MavenSession;
  import org.apache.maven.project.MavenProject;
  import org.codehaus.plexus.archiver.Archiver;
  import org.apache.maven.shared.utils.io.IOUtil;
  
  /**
   * This class is responsible for creating the pom.properties file.
   *
   * @version $Id: PomPropertiesUtil.java 1741255 2016-04-27 13:14:30Z andham $
   */
  public class PomPropertiesUtil
  {
      private static final String CREATED_BY_MAVEN = "Created by Apache Maven";
  
      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;
          }
          OutputStream os = new FileOutputStream( outputFile );
          try
          {
              String createdBy = CREATED_BY_MAVEN;
              if ( session != null ) // can be null due to API backwards compatibility
              {
                  String mavenVersion = session.getSystemProperties().getProperty( "maven.version" );
                  if ( mavenVersion != null )
                  {
                      createdBy += " " + mavenVersion;
                  }
              }
 
             properties.store( os, createdBy );
             os.close(); // stream is flushed but not closed by Properties.store()
             os = null;
         }
         finally
         {
             IOUtil.close( os );
         }
     }
 
     /**
      * 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" );
     }
 }