package org.apache.maven.scm.provider.starteam.command.diff;
   
   /*
    * 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.File;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.maven.scm.ScmFile;
  import org.apache.maven.scm.ScmFileStatus;
  import org.apache.maven.scm.log.ScmLogger;
  import org.codehaus.plexus.util.cli.StreamConsumer;
  
  /**
   * @author <a href="mailto:dantran@gmail.com">Dan T. Tran</a>
   *
   */
  public class StarteamDiffConsumer
      implements StreamConsumer
  {
      private static final String WORKING_DIR_TOKEN = "(working dir: ";
  
      private static final String PATCH_SEPARATOR_TOKEN = "--------------";
  
      private static final String REVISION_TOKEN = " Revision: ";
  
      private static final String ONDISK_TOKEN = " (on disk)";
  
      private static final String ADDED_LINE_TOKEN = "+";
  
      private static final String REMOVED_LINE_TOKEN = "-";
  
      private static final String UNCHANGED_LINE_TOKEN = " ";
  
      private ScmLogger logger;
  
      @SuppressWarnings( "unused" )
      private String currentDir = "";
  
      private boolean diffBlockProcessingStarted = false;
  
      private boolean revisionBlockStarted = false;
  
      private String currentFile;
  
      private StringBuilder currentDifference;
  
      private List<ScmFile> changedFiles = new ArrayList<ScmFile>();
  
      private Map<String, CharSequence> differences = new HashMap<String, CharSequence>();
  
      private StringBuilder patch = new StringBuilder();
  
      // ----------------------------------------------------------------------
      //
      // ----------------------------------------------------------------------
  
      public StarteamDiffConsumer( ScmLogger logger, File workingDirectory )
      {
          this.logger = logger;
      }
  
      // ----------------------------------------------------------------------
      // StreamConsumer Implementation
      // ----------------------------------------------------------------------
  
      /** {@inheritDoc} */
      public void consumeLine( String line )
      {
          int pos = 0;
  
          if ( logger.isDebugEnabled() )
          {
              logger.debug( line );
          }
  
          patch.append( line ).append( "\n" );
  
          if ( line.trim().length() == 0 )
          {
             return;
         }
 
         if ( ( pos = line.indexOf( WORKING_DIR_TOKEN ) ) != -1 )
         {
             processGetDir( line, pos );
 
             return;
         }
 
         if ( line.startsWith( PATCH_SEPARATOR_TOKEN ) )
         {
             diffBlockProcessingStarted = !diffBlockProcessingStarted;
 
             if ( diffBlockProcessingStarted )
             {
                 if ( revisionBlockStarted )
                 {
                     throw new IllegalStateException( "Missing second Revision line or local copy line " );
                 }
             }
 
             return;
         }
 
         if ( ( pos = line.indexOf( REVISION_TOKEN ) ) != -1 )
         {
             if ( revisionBlockStarted )
             {
                 revisionBlockStarted = false;
             }
             else
             {
                 extractCurrentFile( line, pos );
 
                 revisionBlockStarted = true;
             }
 
             return;
         }
 
         if ( ( pos = line.indexOf( ONDISK_TOKEN ) ) != -1 )
         {
             if ( revisionBlockStarted )
             {
                 revisionBlockStarted = false;
             }
             else
             {
                 throw new IllegalStateException( "Working copy line found at the wrong state " );
             }
 
             return;
         }
 
         if ( !diffBlockProcessingStarted )
         {
             if ( logger.isWarnEnabled() )
             {
                 logger.warn( "Unparseable line: '" + line + "'" );
             }
 
             return;
         }
 
         if ( line.startsWith( ADDED_LINE_TOKEN ) || line.startsWith( REMOVED_LINE_TOKEN )
             || line.startsWith( UNCHANGED_LINE_TOKEN ) )
         {
             // add to buffer
             currentDifference.append( line ).append( "\n" );
         }
         else
         {
             if ( logger.isWarnEnabled() )
             {
                 logger.warn( "Unparseable line: '" + line + "'" );
             }
         }
     }
 
     /**
      * Process the current input line in the Get Directory
      *
      * @param line a line of text from the Starteam log output
      */
     private void processGetDir( String line, int pos )
     {
         String dirPath = line.substring( pos + WORKING_DIR_TOKEN.length(), line.length() - 1 ).replace( '\\', '/' );
 
         this.currentDir = dirPath;
     }
 
     private void extractCurrentFile( String line, int pos )
     {
         currentFile = line.substring( 0, pos );
 
         changedFiles.add( new ScmFile( currentFile, ScmFileStatus.MODIFIED ) );
 
         currentDifference = new StringBuilder();
 
         differences.put( currentFile, currentDifference );
     }
 
     public List<ScmFile> getChangedFiles()
     {
         return changedFiles;
     }
 
     public Map<String, CharSequence> getDifferences()
     {
         return differences;
     }
 
     public String getPatch()
     {
         return patch.toString();
     }
 
 }