package org.apache.maven.plugin.pmd;
   
   /*
    * 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.ByteArrayOutputStream;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.OutputStreamWriter;
  import java.io.UnsupportedEncodingException;
  import java.io.Writer;
  import java.util.Locale;
  import java.util.Map;
  import java.util.Properties;
  import java.util.ResourceBundle;
  
  import net.sourceforge.pmd.cpd.CPD;
  import net.sourceforge.pmd.cpd.CSVRenderer;
  import net.sourceforge.pmd.cpd.JavaLanguage;
  import net.sourceforge.pmd.cpd.JavaTokenizer;
  import net.sourceforge.pmd.cpd.Renderer;
  import net.sourceforge.pmd.cpd.XMLRenderer;
  
  import org.apache.maven.reporting.MavenReportException;
  import org.codehaus.plexus.util.FileUtils;
  import org.codehaus.plexus.util.IOUtil;
  import org.codehaus.plexus.util.StringUtils;
  import org.codehaus.plexus.util.WriterFactory;
  
  /**
   * Creates a report for PMD's CPD tool.  See
   * <a href="http://pmd.sourceforge.net/cpd.html">http://pmd.sourceforge.net/cpd.html</a>
   * for more detail.
   *
   * @author Mike Perham
   * @version $Id: CpdReport.html 816696 2012-05-08 15:19:20Z hboutemy $
   * @since 2.0
   * @goal cpd
   * @threadSafe
   */
  public class CpdReport
      extends AbstractPmdReport
  {
      /**
       * The minimum number of tokens that need to be duplicated before it causes a violation.
       *
       * @parameter expression="${minimumTokens}" default-value="100"
       */
      private int minimumTokens;
  
      /**
       * Skip the CPD report generation.  Most useful on the command line
       * via "-Dcpd.skip=true".
       *
       * @parameter expression="${cpd.skip}" default-value="false"
       * @since 2.1
       */
      private boolean skip;
  
      /**
       * If true, CPD ignores literal value differences when evaluating a duplicate block.
       * This means that <code>foo=42;</code> and <code>foo=43;</code> will be seen as equivalent.
       * You may want to run PMD with this option off to start with and then switch it on to see what it turns up.
       *
       * @parameter expression="${cpd.ignoreLiterals}" default-value="false"
       * @since 2.5
       */
      private boolean ignoreLiterals;
  
      /**
       * Similar to <code>ignoreLiterals</code> but for identifiers; i.e., variable names, methods names, and so forth.
       *
       * @parameter expression="${cpd.ignoreIdentifiers}" default-value="false"
       * @since 2.5
       */
      private boolean ignoreIdentifiers;
  
      /** {@inheritDoc} */
      public String getName( Locale locale )
      {
          return getBundle( locale ).getString( "report.cpd.name" );
      }
 
     /** {@inheritDoc} */
     public String getDescription( Locale locale )
     {
         return getBundle( locale ).getString( "report.cpd.description" );
     }
 
     /** {@inheritDoc} */
     public void executeReport( Locale locale )
         throws MavenReportException
     {
         try
         {
             execute( locale );
         }
         finally
         {
             if ( getSink() != null )
             {
                 getSink().close();
             }
         }
     }
 
     private void execute( Locale locale )
         throws MavenReportException
     {
         if ( !skip && canGenerateReport() )
         {
             ClassLoader origLoader = Thread.currentThread().getContextClassLoader();
             try
             {
                 Thread.currentThread().setContextClassLoader( this.getClass().getClassLoader() );
 
                 CPD cpd = generateReport( locale );
 
                 if ( !isHtml() )
                 {
                     writeNonHtml( cpd );
                 }
             }
             finally
             {
                 Thread.currentThread().setContextClassLoader( origLoader );
             }
 
         }
     }
 
     private CPD generateReport( Locale locale )
         throws MavenReportException
     {
         Properties p = new Properties();
         if ( ignoreLiterals )
         {
             p.setProperty( JavaTokenizer.IGNORE_LITERALS, "true" );
         }
         if ( ignoreIdentifiers )
         {
             p.setProperty( JavaTokenizer.IGNORE_IDENTIFIERS, "true" );
         }
         CPD cpd = new CPD( minimumTokens, new JavaLanguage( p ) );
 
         Map<File, PmdFileInfo> files = null;
         try
         {
             files = getFilesToProcess();
 
             if ( StringUtils.isNotEmpty( getSourceEncoding() ) )
             {
                 cpd.setEncoding( getSourceEncoding() );
 
                 // test encoding as CPD will convert exception into a RuntimeException
                 WriterFactory.newWriter( new ByteArrayOutputStream(), getSourceEncoding() );
             }
             else if ( !files.isEmpty() )
             {
                 getLog().warn(
                                "File encoding has not been set, using platform encoding "
                                    + WriterFactory.FILE_ENCODING + ", i.e. build is platform dependent!" );
             }
 
             for ( File file : files.keySet() )
             {
                 cpd.add( file );
             }
         }
         catch ( UnsupportedEncodingException e )
         {
             throw new MavenReportException( "Encoding '" + getSourceEncoding() + "' is not supported.", e );
         }
         catch ( IOException e )
         {
             throw new MavenReportException( e.getMessage(), e );
         }
         cpd.go();
 
         CpdReportGenerator gen =
             new CpdReportGenerator( getSink(), files, getBundle( locale ), aggregate );
         gen.generate( cpd.getMatches() );
 
         return cpd;
     }
 
     void writeNonHtml( CPD cpd )
         throws MavenReportException
     {
         Renderer r = createRenderer();
 
         if ( r == null )
         {
             return;
         }
 
         String buffer = r.render( cpd.getMatches() );
         Writer writer = null;
         try
         {
             targetDirectory.mkdirs();
             File targetFile = new File( targetDirectory, "cpd." + format );
             FileOutputStream tStream = new FileOutputStream( targetFile );
             writer = new OutputStreamWriter( tStream, getOutputEncoding() );
             writer.write( buffer );
             writer.close();
 
             File siteDir = getReportOutputDirectory();
             siteDir.mkdirs();
             FileUtils.copyFile( targetFile, new File( siteDir, "cpd." + format ) );
         }
         catch ( IOException ioe )
         {
             throw new MavenReportException( ioe.getMessage(), ioe );
         }
         finally
         {
             IOUtil.close( writer );
         }
     }
 
     /** {@inheritDoc} */
     public String getOutputName()
     {
         return "cpd";
     }
 
     private static ResourceBundle getBundle( Locale locale )
     {
         return ResourceBundle.getBundle( "cpd-report", locale, CpdReport.class.getClassLoader() );
     }
 
     /**
      * Create and return the correct renderer for the output type.
      *
      * @return the renderer based on the configured output
      * @throws org.apache.maven.reporting.MavenReportException
      *          if no renderer found for the output type
      */
     public Renderer createRenderer()
         throws MavenReportException
     {
         Renderer renderer = null;
         if ( "xml".equals( format ) )
         {
             renderer = new XMLRenderer( getOutputEncoding() );
         }
         else if ( "csv".equals( format ) )
         {
             renderer = new CSVRenderer();
         }
         else if ( !"".equals( format ) && !"none".equals( format ) )
         {
             try
             {
                 renderer = (Renderer) Class.forName( format ).newInstance();
             }
             catch ( Exception e )
             {
                 throw new MavenReportException(
                     "Can't find CPD custom format " + format + ": " + e.getClass().getName(), e );
             }
         }
 
         return renderer;
     }
 }