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.maven.shared.jar.JarAnalyzer;

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

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

 import org.codehaus.plexus.logging.AbstractLogEnabled;

 import org.codehaus.plexus.util.IOUtil;

 import org.codehaus.plexus.util.StringUtils;

 import java.io.BufferedReader;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.InputStreamReader;

 import java.util.ArrayList;

 import java.util.Iterator;

 import java.util.List;

 import java.util.jar.JarEntry;

 /**

  * Exposer that examines a a JAR for files that contain the text <code>version</code> (case-insensitive) and

  * adds the contents as potential version(s).

  *

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

  */

 public class TextFileExposer

     extends AbstractLogEnabled

     implements JarIdentificationExposer

 {

     public void expose( JarIdentification identification, JarAnalyzer jarAnalyzer )

     {

         List textFiles = findTextFileVersions( jarAnalyzer );

         if ( !textFiles.isEmpty() )

         {

             Iterator ithits = textFiles.iterator();

             while ( ithits.hasNext() )

             {

                 String ver = (String) ithits.next();

                 identification.addVersion( ver );

             }

         }

     }

     private List findTextFileVersions( JarAnalyzer jarAnalyzer )

     {

         List textVersions = new ArrayList();

         List hits = jarAnalyzer.getVersionEntries();

         Iterator it = hits.iterator();

         while ( it.hasNext() )

         {

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

             // skip this entry if it's a class file.

             if ( !entry.getName().endsWith( ".class" ) ) //$NON-NLS-1$

             {

                 getLogger().debug( "Version Hit: " + entry.getName() );

                 InputStream is = null;

                 try

                 {

                     is = jarAnalyzer.getEntryInputStream( entry );

                     BufferedReader br = new BufferedReader( new InputStreamReader( is ) );

                     String line = br.readLine();

                     // TODO: check for key=value pair.

                     // TODO: maybe even for groupId entries.

                     getLogger().debug( line );

                     if ( StringUtils.isNotEmpty( line ) )

                     {

                         textVersions.add( line );

                     }

                 }

                 catch ( IOException e )

                 {

                     getLogger().warn( "Unable to read line from " + entry.getName(), e );

                 }

                 finally

                 {

                     IOUtil.close( is );

                 }

             }

         }

         return textVersions;

     }

 }