package org.apache.maven.scm.provider.clearcase.command.changelog;

 /*

  * 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.ChangeFile;

 import org.apache.maven.scm.ChangeSet;

 import org.apache.maven.scm.log.ScmLogger;

 import org.apache.maven.scm.util.AbstractConsumer;

 import java.util.ArrayList;

 import java.util.List;

 /**

  * @author <a href="mailto:evenisse@apache.org">Emmanuel Venisse</a>

  * @author <a href="mailto:trygvis@inamo.no">Trygve Laugst&oslash;l</a>

  * @author Olivier Lamy

  * @version $Id: ClearCaseChangeLogConsumer.java 1094193 2011-04-17 20:28:59Z olamy $

  */

 public class ClearCaseChangeLogConsumer

     extends AbstractConsumer

 {

     /**

      * Formatter used to parse Clearcase date/timestamp.

      */

     private static final String CLEARCASE_TIMESTAMP_PATTERN = "yyyyMMdd.HHmmss";

     private static final String NAME_TAG = "NAME:";

     private static final String USER_TAG = "USER:";

     private static final String DATE_TAG = "DATE:";

     private static final String COMMENT_TAG = "COMM:";

     private static final String REVISION_TAG = "REVI:";

     private List<ChangeSet> entries = new ArrayList<ChangeSet>();

     // state machine constants for reading clearcase lshistory command output

     /**

      * expecting file information

      */

     private static final int GET_FILE = 1;

     /**

      * expecting date

      */

     private static final int GET_DATE = 2;

     /**

      * expecting comments

      */

     private static final int GET_COMMENT = 3;

     /**

      * expecting revision

      */

     private static final int GET_REVISION = 4;

     /**

      * current status of the parser

      */

     private int status = GET_FILE;

     /**

      * the current log entry being processed by the parser

      */

     private ChangeSet currentChange = null;

     /**

      * the current file being processed by the parser

      */

     private ChangeFile currentFile = null;

     private String userDatePattern;

     // ----------------------------------------------------------------------

     //

     // ----------------------------------------------------------------------

     public ClearCaseChangeLogConsumer( ScmLogger logger, String userDatePattern )

     {

         super( logger );

         this.userDatePattern = userDatePattern;

     }

     // ----------------------------------------------------------------------

     //

     // ----------------------------------------------------------------------

     public List<ChangeSet> getModifications()

     {

         return entries;

     }

     // ----------------------------------------------------------------------

     // StreamConsumer Implementation

     // ----------------------------------------------------------------------

     /** {@inheritDoc} */

     public void consumeLine( String line )

     {

         switch ( getStatus() )

         {

             case GET_FILE:

                 processGetFile( line );

                 break;

             case GET_DATE:

                 processGetDate( line );

                 break;

             case GET_COMMENT:

                 processGetCommentAndUser( line );

                 break;

             case GET_REVISION:

                 processGetRevision( line );

                 break;

             default:

                 if ( getLogger().isWarnEnabled() )

                 {

                     getLogger().warn( "Unknown state: " + status );

                 }

         }

     }

     // ----------------------------------------------------------------------

     //

     // ----------------------------------------------------------------------

     /**

      * Process the current input line in the Get File state.

      *

      * @param line a line of text from the clearcase log output

      */

     private void processGetFile( String line )

     {

         if ( line.startsWith( NAME_TAG ) )

         {

             setCurrentChange( new ChangeSet() );

             setCurrentFile( new ChangeFile( line.substring( NAME_TAG.length(), line.length() ) ) );

             setStatus( GET_DATE );

         }

     }

     /**

      * Process the current input line in the Get Date state.

      *

      * @param line a line of text from the clearcase log output

      */

     private void processGetDate( String line )

     {

         if ( line.startsWith( DATE_TAG ) )

         {

             getCurrentChange().setDate(

                 parseDate( line.substring( DATE_TAG.length() ), userDatePattern, CLEARCASE_TIMESTAMP_PATTERN ) );

             setStatus( GET_COMMENT );

         }

     }

     /**

      * Process the current input line in the Get Comment state.

      *

      * @param line a line of text from the clearcase log output

      */

     private void processGetCommentAndUser( String line )

     {

         if ( line.startsWith( COMMENT_TAG ) )

         {

             String comm = line.substring( COMMENT_TAG.length() );

             getCurrentChange().setComment( getCurrentChange().getComment() + comm + "\n" );

         }

         else if ( line.startsWith( USER_TAG ) )

         {

             getCurrentChange().setAuthor( line.substring( USER_TAG.length() ) );

             // add entry, and set state to get file

             getCurrentChange().addFile( getCurrentFile() );

             entries.add( getCurrentChange() );

             setStatus( GET_REVISION );

         }

         else

         {

             // keep gathering comments

             getCurrentChange().setComment( getCurrentChange().getComment() + line + "\n" );

         }

     }

     /**

      * Process the current input line in the Get Revision.

      *

      * @param line a line of text from the clearcase log output

      */

     private void processGetRevision( String line )

     {

         if ( line.startsWith( REVISION_TAG ) )

         {

             getCurrentChange().setRevision( line.substring( REVISION_TAG.length() ) );

             setStatus( GET_FILE );

         }

     }

     /**

      * Getter for property currentFile.

      *

      * @return Value of property currentFile.

      */

     private ChangeFile getCurrentFile()

     {

         return currentFile;

     }

     /**

      * Setter for property currentFile.

      *

      * @param currentFile New value of property currentFile.

      */

     private void setCurrentFile( ChangeFile currentFile )

     {

         this.currentFile = currentFile;

     }

     /**

      * Getter for property currentChange.

      *

      * @return Value of property currentChange.

      */

     private ChangeSet getCurrentChange()

     {

         return currentChange;

     }

     /**

      * Setter for property currentLogEntry.

      *

      * @param currentChange New value of property currentLogEntry.

      */

     private void setCurrentChange( ChangeSet currentChange )

     {

         this.currentChange = currentChange;

     }

     /**

      * Getter for property status.

      *

      * @return Value of property status.

      */

     private int getStatus()

     {

         return status;

     }

     /**

      * Setter for property status.

      *

      * @param status New value of property status.

      */

     private void setStatus( int status )

     {

         this.status = status;

     }

 }