package org.apache.maven.plugin.coreit;
   
   /*
    * 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 org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.Properties;
  
  /**
   * Checks the general retrieval of components from active component collections.
   *
   * @goal check
   * @phase validate
   *
   * @author Benjamin Bentmann
   */
  public class CheckMojo
      extends AbstractMojo
  {
  
      /**
       * Project base directory used for manual path alignment.
       *
       * @parameter default-value="${basedir}"
       * @readonly
       */
      private File basedir;
  
      /**
       * The available components, as a map.
       *
       * @component role="org.apache.maven.plugin.coreit.Component"
       */
      private Map componentMap;
  
      /**
       * The available components, as a list.
       *
       * @component role="org.apache.maven.plugin.coreit.Component"
       */
      private List componentList;
  
      /**
       * The path to the properties file to create.
       *
       * @parameter property="collections.outputFile"
       */
      private File outputFile;
  
      /**
       * Runs this mojo.
       *
       * @throws MojoFailureException If the output file could not be created.
       */
      public void execute()
          throws MojoExecutionException, MojoFailureException
      {
          Properties componentProperties = new Properties();
  
          getLog().info( "[MAVEN-CORE-IT-LOG] Dumping component info" );
  
          componentProperties.setProperty( "count", Integer.toString( componentList.size() ) );
  
          if ( componentList.size() != componentMap.size() )
          {
              throw new MojoExecutionException( "Inconsistent collection: " + componentList + " vs " + componentMap );
          }
  
          for ( int i = componentList.size() - 1; i >= 0; i-- )
          {
              Object component = componentList.get( i );
  
              if ( component != componentList.get( i ) )
             {
                 throw new MojoExecutionException( "Invalid re-lookup of component from list: " + i );
             }
         }
 
         int i = 0;
         for ( Iterator it = componentMap.keySet().iterator(); it.hasNext(); i++ )
         {
             String roleHint = (String) it.next();
             componentProperties.setProperty( "component." + i + ".hint", roleHint );
 
             Object component = componentMap.get( roleHint );
 
             if ( component != null )
             {
                 String hash = Integer.toString( System.identityHashCode( component ) );
                 componentProperties.setProperty( "component." + i + ".hash", hash );
                 componentProperties.setProperty( "component." + roleHint + ".hash", hash );
             }
 
             if ( component != componentMap.get( roleHint ) )
             {
                 throw new MojoExecutionException( "Invalid re-lookup of component from map: " + roleHint );
             }
 
             getLog().info( "[MAVEN-CORE-IT-LOG]   " + roleHint + " = " + component );
         }
 
         if ( !outputFile.isAbsolute() )
         {
             outputFile = new File( basedir, outputFile.getPath() );
         }
 
         getLog().info( "[MAVEN-CORE-IT-LOG] Creating output file " + outputFile );
 
         OutputStream out = null;
         try
         {
             outputFile.getParentFile().mkdirs();
             out = new FileOutputStream( outputFile );
             componentProperties.store( out, "MAVEN-CORE-IT-LOG" );
         }
         catch ( IOException e )
         {
             throw new MojoExecutionException( "Output file could not be created: " + outputFile, e );
         }
         finally
         {
             if ( out != null )
             {
                 try
                 {
                     out.close();
                 }
                 catch ( IOException e )
                 {
                     // just ignore
                 }
             }
         }
 
         getLog().info( "[MAVEN-CORE-IT-LOG] Created output file " + outputFile );
     }
 
 }