package org.apache.maven.shared.filtering;
   
   /*
    * 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.BufferedReader;
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.FileNotFoundException;
  import java.io.FileOutputStream;
  import java.io.FileReader;
  import java.io.FileWriter;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.io.OutputStreamWriter;
  import java.io.Reader;
  import java.io.UnsupportedEncodingException;
  import java.io.Writer;
  import java.util.List;
  
  import javax.annotation.Nonnull;
  import javax.annotation.Nullable;
  
  import org.apache.maven.execution.MavenSession;
  import org.apache.maven.project.MavenProject;
  import org.apache.maven.shared.utils.StringUtils;
  import org.apache.maven.shared.utils.io.FileUtils;
  import org.apache.maven.shared.utils.io.FileUtils.FilterWrapper;
  import org.apache.maven.shared.utils.io.IOUtil;
  import org.codehaus.plexus.component.annotations.Component;
  import org.codehaus.plexus.component.annotations.Requirement;
  import org.sonatype.plexus.build.incremental.BuildContext;
  
  /**
   * @author Olivier Lamy
   */
  @Component( role = org.apache.maven.shared.filtering.MavenFileFilter.class, hint = "default" )
  public class DefaultMavenFileFilter
      extends BaseFilter
      implements MavenFileFilter
  {
  
      @Requirement
      private MavenReaderFilter readerFilter;
  
      @Requirement
      private BuildContext buildContext;
  
      /** {@inheritDoc} */
      public void copyFile( File from, File to, boolean filtering, MavenProject mavenProject, List<String> filters,
                            boolean escapedBackslashesInFilePath, String encoding, MavenSession mavenSession )
                                throws MavenFilteringException
      {
          MavenResourcesExecution mre = new MavenResourcesExecution();
          mre.setMavenProject( mavenProject );
          mre.setFileFilters( filters );
          mre.setEscapeWindowsPaths( escapedBackslashesInFilePath );
          mre.setMavenSession( mavenSession );
          mre.setInjectProjectBuildFilters( true );
  
          List<FileUtils.FilterWrapper> filterWrappers = getDefaultFilterWrappers( mre );
          copyFile( from, to, filtering, filterWrappers, encoding );
      }
  
      /** {@inheritDoc} */
      public void copyFile( MavenFileFilterRequest mavenFileFilterRequest )
          throws MavenFilteringException
      {
          List<FilterWrapper> filterWrappers = getDefaultFilterWrappers( mavenFileFilterRequest );
  
          copyFile( mavenFileFilterRequest.getFrom(), mavenFileFilterRequest.getTo(),
                    mavenFileFilterRequest.isFiltering(), filterWrappers, mavenFileFilterRequest.getEncoding() );
      }
  
      /** {@inheritDoc} */
      public void copyFile( File from, File to, boolean filtering, List<FileUtils.FilterWrapper> filterWrappers,
                            String encoding )
                                throws MavenFilteringException
      {
          // overwrite forced to false to preserve backward comp
          copyFile( from, to, filtering, filterWrappers, encoding, false );
      }
  
     /** {@inheritDoc} */
     public void copyFile( File from, File to, boolean filtering, List<FileUtils.FilterWrapper> filterWrappers,
                           String encoding, boolean overwrite )
                               throws MavenFilteringException
     {
         try
         {
             if ( filtering )
             {
                 if ( getLogger().isDebugEnabled() )
                 {
                     getLogger().debug( "filtering " + from.getPath() + " to " + to.getPath() );
                 }
                 filterFile( from, to, encoding, filterWrappers );
             }
             else
             {
                 if ( getLogger().isDebugEnabled() )
                 {
                     getLogger().debug( "copy " + from.getPath() + " to " + to.getPath() );
                 }
                 FileUtils.copyFile( from, to, encoding, new FileUtils.FilterWrapper[0], overwrite );
             }
 
             buildContext.refresh( to );
         }
         catch ( IOException e )
         {
             throw new MavenFilteringException( e.getMessage(), e );
         }
 
     }
 
     private void filterFile( @Nonnull File from, @Nonnull File to, @Nullable String encoding,
                              @Nullable List<FilterWrapper> wrappers )
                                  throws IOException, MavenFilteringException
     {
         if ( wrappers != null && wrappers.size() > 0 )
         {
             Reader fileReader = null;
             Writer fileWriter = null;
             try
             {
                 fileReader = getFileReader( encoding, from );
                 fileWriter = getFileWriter( encoding, to );
                 Reader src = readerFilter.filter( fileReader, true, wrappers );
 
                 IOUtil.copy( src, fileWriter );
             }
             finally
             {
                 IOUtil.close( fileReader );
                 IOUtil.close( fileWriter );
             }
         }
         else
         {
             if ( to.lastModified() < from.lastModified() )
             {
                 FileUtils.copyFile( from, to );
             }
         }
     }
 
     private Writer getFileWriter( String encoding, File to )
         throws IOException
     {
         if ( StringUtils.isEmpty( encoding ) )
         {
             return new FileWriter( to );
         }
         else
         {
             FileOutputStream outstream = new FileOutputStream( to );
 
             return new OutputStreamWriter( outstream, encoding );
         }
     }
 
     private Reader getFileReader( String encoding, File from )
         throws FileNotFoundException, UnsupportedEncodingException
     {
         // buffer so it isn't reading a byte at a time!
         if ( StringUtils.isEmpty( encoding ) )
         {
             return new BufferedReader( new FileReader( from ) );
         }
         else
         {
             FileInputStream instream = new FileInputStream( from );
             return new BufferedReader( new InputStreamReader( instream, encoding ) );
         }
     }
 
 }