package org.apache.maven.changelog;

 /*

  * Copyright 2001-2006 The Apache Software Foundation.

  *

  * Licensed 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.command.changelog.ChangeLogSet;

 import org.xml.sax.Attributes;

 import org.xml.sax.SAXException;

 import org.xml.sax.helpers.DefaultHandler;

 import java.text.ParseException;

 import java.text.SimpleDateFormat;

 import java.util.Collection;

 import java.util.Date;

 import java.util.LinkedList;

 import java.util.TimeZone;

 /**

  * Change log generated xml parser.  SAXParser listener for processing a previously generated xml into several

  * change log sets.

  */

 public class ChangeLogHandler

     extends DefaultHandler

 {

     private Collection changeSets;

     private String bufData = "";

     private ChangeFile bufFile;

     private ChangeSet bufEntry;

     private LinkedList bufEntries;

     private ChangeLogSet bufSet;

     private String currentPattern;

     /**

      * contructor

      *

      * @param changeSets collection object to store all change sets found within the xml document

      */

     public ChangeLogHandler( Collection changeSets )

     {

         this.changeSets = changeSets;

     }

     /**

      * @see org.xml.sax.helpers.DefaultHandler#characters(char[],int,int)

      */

     public void characters( char[] ch, int start, int length )

         throws SAXException

     {

         bufData += new String( ch, start, length );

     }

     /**

      * @see org.xml.sax.helpers.DefaultHandler#endElement(String,String,String)

      */

     public void endElement( String uri, String localName, String qName )

         throws SAXException

     {

         if ( "changeset".equals( qName ) )

         {

             changeSets.add( bufSet );

         }

         if ( "changelog-entry".equals( qName ) )

         {

             bufEntries.add( bufEntry );

         }

         if ( "file".equals( qName ) )

         {

             bufEntry.addFile( bufFile );

         }

         else if ( "date".equals( qName ) )

         {

             try

             {

                 long ms = 0;

                 if ( bufEntry.getDate() != null )

                 {

                     ms = bufEntry.getDate().getTime();

                 }

                 bufEntry.setDate( new Date( ms + new SimpleDateFormat( currentPattern ).parse( bufData ).getTime() ) );

             }

             catch ( ParseException e )

             {

                 throw new SAXException( e );

             }

         }

         else if ( "time".equals( qName ) )

         {

             try

             {

                 long ms = 0;

                 if ( bufEntry.getDate() != null )

                 {

                     ms = bufEntry.getDate().getTime();

                 }

                 bufEntry.setDate( new Date( ms + new SimpleDateFormat( currentPattern ).parse( bufData ).getTime() + TimeZone.getDefault().getRawOffset()) );

             }

             catch ( ParseException e )

             {

                 throw new SAXException( e );

             }

         }

         else if ( "author".equals( qName ) )

         {

             bufEntry.setAuthor( bufData );

         }

         else if ( "msg".equals( qName ) )

         {

             bufEntry.setComment( bufData );

         }

         if ( "revision".equals( qName ) )

         {

             bufFile.setRevision( bufData );

         }

         else if ( "name".equals( qName ) )

         {

             bufFile.setName( bufData.replaceFirst( " \\(from [^:]+:\\d+\\)", "" ) );

         }

     }

     /**

      * @see org.xml.sax.helpers.DefaultHandler#startElement(String,String,String,Attributes)

      */

     public void startElement( String uri, String localName, String qName, Attributes attributes )

         throws SAXException

     {

         bufData = "";

         if ( "file".equals( qName ) )

         {

             bufFile = new ChangeFile( "" );

         }

         else if ( "changelog-entry".equals( qName ) )

         {

             bufEntry = new ChangeSet();

         }

         else if ( "date".equals( qName ) )

         {

             currentPattern = attributes.getValue( "pattern" );

             if ( currentPattern == null )

             {

                 currentPattern = "yyyy-MM-dd";

             }

         }

         else if ( "time".equals( qName ) )

         {

             currentPattern = attributes.getValue( "pattern" );

             if ( currentPattern == null )

             {

                 currentPattern = "HH:mm:ss";

             }

         }

         else if ( "changeset".equals( qName ) )

         {

             bufEntries = new LinkedList();

             currentPattern = attributes.getValue( "datePattern" );

             if ( currentPattern == null )

             {

                 currentPattern = "yyyy-MM-dd";

             }

             SimpleDateFormat formatter = new SimpleDateFormat( currentPattern );

             String start = attributes.getValue( "start" );

             String end = attributes.getValue( "end" );

             Date startDate = null;

             Date endDate = null;

             if ( start != null )

             {

                 try

                 {

                     startDate = formatter.parse( start );

                 }

                 catch ( ParseException e )

                 {

                     throw new SAXException( "Can't parse start date '" + start + "'.", e );

                 }

             }

             if ( end != null )

             {

                 try

                 {

                     endDate = formatter.parse( end );

                 }

                 catch ( ParseException e )

                 {

                     throw new SAXException( "Can't parse end date '" + end + "'.", e );

                 }

             }

             bufSet = new ChangeLogSet( bufEntries, startDate, endDate );

         }

     }

 }