package org.apache.maven.shared.jar.identification.exposers;

 /*

  * 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.commons.collections.Bag;

 import org.apache.commons.collections.bag.HashBag;

 import org.apache.maven.shared.jar.JarAnalyzer;

 import org.apache.maven.shared.jar.identification.JarIdentification;

 import org.apache.maven.shared.jar.identification.JarIdentificationExposer;

 import org.codehaus.plexus.util.StringUtils;

 import java.text.SimpleDateFormat;

 import java.util.Date;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Locale;

 import java.util.jar.JarEntry;

 /**

  * Exposer that examines a a JAR and uses the most recent timestamp as a potential version.

  *

  * @plexus.component role="org.apache.maven.shared.jar.identification.JarIdentificationExposer" role-hint="timestamp"

  */

 public class TimestampExposer

     implements JarIdentificationExposer

 {

     public void expose( JarIdentification identification, JarAnalyzer jarAnalyzer )

     {

         List entries = jarAnalyzer.getEntries();

         SimpleDateFormat tsformat = new SimpleDateFormat( "yyyyMMdd", Locale.US ); //$NON-NLS-1$

         Bag timestamps = new HashBag();

         Iterator it = entries.iterator();

         while ( it.hasNext() )

         {

             JarEntry entry = (JarEntry) it.next();

             long time = entry.getTime();

             String timestamp = tsformat.format( new Date( time ) );

             timestamps.add( timestamp );

         }

         it = timestamps.iterator();

         String ts = "";

         int tsmax = 0;

         while ( it.hasNext() )

         {

             String timestamp = (String) it.next();

             int count = timestamps.getCount( timestamp );

             if ( count > tsmax )

             {

                 ts = timestamp;

                 tsmax = count;

             }

         }

         if ( StringUtils.isNotEmpty( ts ) )

         {

             identification.addVersion( ts );

         }

     }

 }