package org.apache.maven.plugin.compiler;
   
   /*
    * 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.artifact.Artifact;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugins.annotations.LifecyclePhase;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.apache.maven.plugins.annotations.ResolutionScope;
  import org.codehaus.plexus.compiler.util.scan.SimpleSourceInclusionScanner;
  import org.codehaus.plexus.compiler.util.scan.SourceInclusionScanner;
  import org.codehaus.plexus.compiler.util.scan.StaleSourceScanner;
  
  import java.io.File;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  /**
   * Compiles application sources
   *
   * @author <a href="mailto:jason@maven.org">Jason van Zyl </a>
   * @version $Id: CompilerMojo.html 853234 2013-03-06 08:14:46Z olamy $
   * @since 2.0
   */
  @org.apache.maven.plugins.annotations.Mojo( name = "compile", defaultPhase = LifecyclePhase.COMPILE, threadSafe = true,
                                              requiresDependencyResolution = ResolutionScope.COMPILE )
  public class CompilerMojo
      extends AbstractCompilerMojo
  {
      /**
       * The source directories containing the sources to be compiled.
       */
      @Parameter( defaultValue = "${project.compileSourceRoots}", readonly = true, required = true )
      private List<String> compileSourceRoots;
  
      /**
       * Project classpath.
       */
      @Parameter( defaultValue = "${project.compileClasspathElements}", readonly = true, required = true )
      private List<String> classpathElements;
  
      /**
       * The directory for compiled classes.
       */
      @Parameter( defaultValue = "${project.build.outputDirectory}", required = true, readonly = true )
      private File outputDirectory;
  
      /**
       * Projects main artifact.
       *
       * @todo this is an export variable, really
       */
      @Parameter( defaultValue = "${project.artifact}", readonly = true, required = true )
      private Artifact projectArtifact;
  
      /**
       * A list of inclusion filters for the compiler.
       */
      @Parameter
      private Set<String> includes = new HashSet<String>();
  
      /**
       * A list of exclusion filters for the compiler.
       */
      @Parameter
      private Set<String> excludes = new HashSet<String>();
  
      /**
       * <p>
       * Specify where to place generated source files created by annotation processing.
       * Only applies to JDK 1.6+
       * </p>
       *
       * @since 2.2
       */
      @Parameter( defaultValue = "${project.build.directory}/generated-sources/annotations" )
      private File generatedSourcesDirectory;
  
      /**
      * Set this to 'true' to bypass compilation of main sources.
      * Its use is NOT RECOMMENDED, but quite convenient on occasion.
      */
     @Parameter ( property = "maven.main.skip" )
     private boolean skipMain;
 
     protected List<String> getCompileSourceRoots()
     {
         return compileSourceRoots;
     }
 
     protected List<String> getClasspathElements()
     {
         return classpathElements;
     }
 
     protected File getOutputDirectory()
     {
         return outputDirectory;
     }
 
     public void execute()
         throws MojoExecutionException, CompilationFailureException
     {
         if ( skipMain )
         {
             getLog().info( "Not compiling main sources" );
             return;
         }
         super.execute();
 
         if ( outputDirectory.isDirectory() )
         {
             projectArtifact.setFile( outputDirectory );
         }
     }
 
     protected SourceInclusionScanner getSourceInclusionScanner( int staleMillis )
     {
         SourceInclusionScanner scanner = null;
 
         if ( includes.isEmpty() && excludes.isEmpty() )
         {
             scanner = new StaleSourceScanner( staleMillis );
         }
         else
         {
             if ( includes.isEmpty() )
             {
                 includes.add( "**/*.java" );
             }
             scanner = new StaleSourceScanner( staleMillis, includes, excludes );
         }
 
         return scanner;
     }
 
     protected SourceInclusionScanner getSourceInclusionScanner( String inputFileEnding )
     {
         SourceInclusionScanner scanner = null;
 
         // it's not defined if we get the ending with or without the dot '.'
         String defaultIncludePattern = "**/*" + ( inputFileEnding.startsWith( "." ) ? "" : "." ) + inputFileEnding;
 
         if ( includes.isEmpty() && excludes.isEmpty() )
         {
             includes = Collections.singleton( defaultIncludePattern );
             scanner = new SimpleSourceInclusionScanner( includes, Collections.<String>emptySet() );
         }
         else
         {
             if ( includes.isEmpty() )
             {
                 includes.add( defaultIncludePattern );
             }
             scanner = new SimpleSourceInclusionScanner( includes, excludes );
         }
 
         return scanner;
     }
 
     protected String getSource()
     {
         return source;
     }
 
     protected String getTarget()
     {
         return target;
     }
 
     protected String getCompilerArgument()
     {
         return compilerArgument;
     }
 
     protected Map<String, String> getCompilerArguments()
     {
         return compilerArguments;
     }
 
     protected File getGeneratedSourcesDirectory()
     {
         return generatedSourcesDirectory;
     }
 
 }