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 java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.util.List;
  import java.util.Map;
  import java.util.Properties;
  
  /**
   * Requires a singleton component in various ways and dumps the ids to a properties file.
   *
   * @author Benjamin Bentmann
   *
   * @goal it
   * @phase initialize
   */
  public class ItMojo
      extends AbstractMojo
  {
  
      /**
       * The path to the output file.
       *
       * @parameter property="touch.outputFile" default-value="target/comp.properties"
       */
      private File outputFile;
  
      /**
       * Component lookup without role hint.
       *
       * @component
       */
      private Component componentWithoutRoleHint;
  
      /**
       * Component lookup with explicit role hint.
       *
       * @component roleHint="default"
       */
      private Component componentWithRoleHint;
  
      /**
       * Component lookup via active map.
       *
       * @component role="org.apache.maven.plugin.coreit.Component"
       */
      private Map componentMap;
  
      /**
       * Component lookup via active list.
       *
       * @component role="org.apache.maven.plugin.coreit.Component"
       */
      private List componentList;
  
      /**
       * Runs this mojo.
       *
       * @throws MojoExecutionException If the output file could not be created.
       */
      public void execute()
          throws MojoExecutionException
      {
          Component componentFromMap = (Component) componentMap.values().iterator().next();
          Component componentFromList = (Component) componentList.iterator().next();
  
          getLog().info( "[MAVEN-CORE-IT-LOG] Using component: " + componentWithoutRoleHint );
          getLog().info( "[MAVEN-CORE-IT-LOG] Using component: " + componentWithRoleHint );
          getLog().info( "[MAVEN-CORE-IT-LOG] Using component: " + componentFromMap );
          getLog().info( "[MAVEN-CORE-IT-LOG] Using component: " + componentFromList );
  
          Properties props = new Properties();
          props.setProperty( "id.0", componentWithoutRoleHint.getId() );
          props.setProperty( "id.1", componentWithRoleHint.getId() );
          props.setProperty( "id.2", componentFromMap.getId() );
          props.setProperty( "id.3", componentFromList.getId() );
 
         getLog().info( "[MAVEN-CORE-IT-LOG] Creating output file: " + outputFile );
 
         try
         {
             outputFile.getParentFile().mkdirs();
             try ( FileOutputStream os = new FileOutputStream( outputFile ) )
             {
                 props.store( os, "MAVEN-CORE-IT-LOG" );
             }
         }
         catch ( IOException e )
         {
             throw new MojoExecutionException( "Output file could not be created: " + outputFile, e );
         }
 
         getLog().info( "[MAVEN-CORE-IT-LOG] Created output file: " + outputFile );
     }
 
 }