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.util.AbstractConsumer;
  
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.List;
  import java.util.TimeZone;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * @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 Pattern LINE_PATTERN = Pattern.compile( "line-number=\"(.*)\"" );
  
      private static final Pattern REVISION_PATTERN = Pattern.compile( "revision=\"(.*)\"" );
  
      private static final Pattern AUTHOR_PATTERN = Pattern.compile( "<author>(.*)</author>" );
  
      private static final Pattern DATE_PATTERN = Pattern.compile( "<date>(.*)T(.*)\\.(.*)Z</date>" );
  
  
      private final SimpleDateFormat dateFormat;
  
      private final List<BlameLine> lines = new ArrayList<>();
  
      public SvnBlameConsumer()
      {
          dateFormat = new SimpleDateFormat( SVN_TIMESTAMP_PATTERN );
          dateFormat.setTimeZone( TimeZone.getTimeZone( "UTC" ) );
      }
  
      private int lineNumber;
  
      private String revision;
  
      private String author;
  
      public void consumeLine( String line )
      {
          Matcher matcher;
          if ( ( matcher = LINE_PATTERN.matcher( line ) ).find() )
          {
              String lineNumberStr = matcher.group( 1 );
              lineNumber = Integer.parseInt( lineNumberStr );
          }
          else if ( ( matcher = REVISION_PATTERN.matcher( line ) ).find() )
          {
              revision = matcher.group( 1 );
          }
          else if ( ( matcher = AUTHOR_PATTERN.matcher( line ) ).find() )
          {
              author = matcher.group( 1 );
          }
          else if ( ( matcher = DATE_PATTERN.matcher( line ) ).find() )
          {
              String date = matcher.group( 1 );
              String time = matcher.group( 2 );
              Date dateTime = parseDateTime( date + " " + time );
              lines.add( new BlameLine( dateTime, revision, author ) );
              if ( logger.isDebugEnabled() )
              {
                  logger.debug( "Author of line " + lineNumber + ": " + author + " (" + date + ")" );
              }
          }
      }
  
      protected Date parseDateTime( String dateTimeStr )
      {
         try
         {
             return dateFormat.parse( dateTimeStr );
         }
         catch ( ParseException e )
         {
             logger.error( "skip ParseException: " + e.getMessage() + " during parsing date " + dateTimeStr, e );
             return null;
         }
     }
 
     public List<BlameLine> getLines()
     {
         return lines;
     }
 }