package org.apache.maven.shared.io.scan;

 /*

  * 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.io.scan.mapping.SourceMapping;

 import java.io.File;

 import java.util.Collections;

 import java.util.HashSet;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Set;

 /**

  * @author jdcasey

  * @version $Id: StaleResourceScanner.java 595935 2007-11-17 11:39:34Z vsiveton $

  */

 public class StaleResourceScanner

     extends AbstractResourceInclusionScanner

 {

     private final long lastUpdatedWithinMsecs;

     private final Set sourceIncludes;

     private final Set sourceExcludes;

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

     //

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

     public StaleResourceScanner()

     {

         this( 0, Collections.singleton( "**/*" ), Collections.EMPTY_SET );

     }

     public StaleResourceScanner( long lastUpdatedWithinMsecs )

     {

         this( lastUpdatedWithinMsecs, Collections.singleton( "**/*" ), Collections.EMPTY_SET );

     }

     public StaleResourceScanner( long lastUpdatedWithinMsecs, Set sourceIncludes, Set sourceExcludes )

     {

         this.lastUpdatedWithinMsecs = lastUpdatedWithinMsecs;

         this.sourceIncludes = sourceIncludes;

         this.sourceExcludes = sourceExcludes;

     }

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

     // SourceInclusionScanner Implementation

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

     public Set getIncludedSources( File sourceDir, File targetDir )

         throws InclusionScanException

     {

         List srcMappings = getSourceMappings();

         if ( srcMappings.isEmpty() )

         {

             return Collections.EMPTY_SET;

         }

         String[] potentialIncludes = scanForSources( sourceDir, sourceIncludes, sourceExcludes );

         Set matchingSources = new HashSet();

         for ( int i = 0; i < potentialIncludes.length; i++ )

         {

             String path = potentialIncludes[i];

             File sourceFile = new File( sourceDir, path );

             staleSourceFileTesting: for ( Iterator patternIt = srcMappings.iterator(); patternIt.hasNext(); )

             {

                 SourceMapping mapping = (SourceMapping) patternIt.next();

                 Set targetFiles = mapping.getTargetFiles( targetDir, path );

                 // never include files that don't have corresponding target mappings.

                 // the targets don't have to exist on the filesystem, but the

                 // mappers must tell us to look for them.

                 for ( Iterator targetIt = targetFiles.iterator(); targetIt.hasNext(); )

                 {

                     File targetFile = (File) targetIt.next();

                     if ( !targetFile.exists()

                         || ( targetFile.lastModified() + lastUpdatedWithinMsecs < sourceFile.lastModified() ) )

                     {

                         matchingSources.add( sourceFile );

                         break staleSourceFileTesting;

                     }

                 }

             }

         }

         return matchingSources;

     }

 }