package org.apache.maven.scm.provider.svn.svnexe.command.blame;
   
   /*
    * 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.scm.command.blame.BlameLine;
  import org.apache.maven.scm.log.ScmLogger;
  import org.apache.maven.scm.util.AbstractConsumer;
  import org.apache.regexp.RE;
  import org.apache.regexp.RESyntaxException;
  
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.List;
  import java.util.TimeZone;
  
  /**
   * @author Evgeny Mandrikov
   * @author Olivier Lamy
   * @since 1.4
   */
  public class SvnBlameConsumer
      extends AbstractConsumer
  {
      private static final String SVN_TIMESTAMP_PATTERN = "yyyy-MM-dd HH:mm:ss";
  
      private static final String LINE_PATTERN = "line-number=\"(.*)\"";
  
      private static final String REVISION_PATTERN = "revision=\"(.*)\"";
  
      private static final String AUTHOR_PATTERN = "<author>(.*)</author>";
  
      private static final String DATE_PATTERN = "<date>(.*)T(.*)\\.(.*)Z</date>";
  
      /**
       * @see #LINE_PATTERN
       */
      private RE lineRegexp;
  
      /**
       * @see #REVISION_PATTERN
       */
      private RE revisionRegexp;
  
      /**
       * @see #AUTHOR_PATTERN
       */
      private RE authorRegexp;
  
      /**
       * @see #DATE_PATTERN
       */
      private RE dateRegexp;
  
      private SimpleDateFormat dateFormat;
  
      private List<BlameLine> lines = new ArrayList<BlameLine>();
  
      public SvnBlameConsumer( ScmLogger logger )
      {
          super( logger );
  
          dateFormat = new SimpleDateFormat( SVN_TIMESTAMP_PATTERN );
          dateFormat.setTimeZone( TimeZone.getTimeZone( "UTC" ) );
  
          try
          {
              lineRegexp = new RE( LINE_PATTERN );
              revisionRegexp = new RE( REVISION_PATTERN );
              authorRegexp = new RE( AUTHOR_PATTERN );
              dateRegexp = new RE( DATE_PATTERN );
          }
          catch ( RESyntaxException ex )
          {
              throw new RuntimeException(
                  "INTERNAL ERROR: Could not create regexp to parse git log file. This shouldn't happen. Something is probably wrong with the oro installation.",
                  ex );
          }
      }
  
      private int lineNumber;
 
     private String revision;
 
     private String author;
 
     public void consumeLine( String line )
     {
         if ( lineRegexp.match( line ) )
         {
             String lineNumberStr = lineRegexp.getParen( 1 );
             lineNumber = Integer.parseInt( lineNumberStr );
         }
         else if ( revisionRegexp.match( line ) )
         {
             revision = revisionRegexp.getParen( 1 );
         }
         else if ( authorRegexp.match( line ) )
         {
             author = authorRegexp.getParen( 1 );
         }
         else if ( dateRegexp.match( line ) )
         {
             String date = dateRegexp.getParen( 1 );
             String time = dateRegexp.getParen( 2 );
             Date dateTime = parseDateTime( date + " " + time );
             lines.add( new BlameLine( dateTime, revision, author ) );
             if ( getLogger().isDebugEnabled() )
             {
                 getLogger().debug( "Author of line " + lineNumber + ": " + author + " (" + date + ")" );
             }
         }
     }
 
     protected Date parseDateTime( String dateTimeStr )
     {
         try
         {
             return dateFormat.parse( dateTimeStr );
         }
         catch ( ParseException e )
         {
             getLogger().error( "skip ParseException: " + e.getMessage() + " during parsing date " + dateTimeStr, e );
             return null;
         }
     }
 
     public List<BlameLine> getLines()
     {
         return lines;
     }
 }