package org.apache.maven.plugins.shade.filter;
   
   /*
    * 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.codehaus.plexus.util.SelectorUtils;
  
  import java.io.File;
  import java.util.HashSet;
  import java.util.Set;
  
  /**
   * @author David Blevins
   */
  public class SimpleFilter
      implements Filter
  {
  
      private Set<File> jars;
  
      private Set<String> includes;
  
      private Set<String> excludes;
  
      public SimpleFilter( Set<File> jars, Set<String> includes, Set<String> excludes )
      {
          this.jars = ( jars != null ) ? new HashSet<File>( jars ) : new HashSet<File>();
          this.includes = normalizePatterns( includes );
          this.excludes = normalizePatterns( excludes );
      }
  
      public boolean canFilter( File jar )
      {
          return jars.contains( jar );
      }
  
      public boolean isFiltered( String classFile )
      {
          String path = normalizePath( classFile );
  
          return !( isIncluded( path ) && !isExcluded( path ) );
      }
  
      public boolean isSpecificallyIncluded( String classFile )
      {
          if ( includes == null || includes.isEmpty() )
          {
              return false;
          }
  
          String path = normalizePath( classFile );
  
          return isIncluded( path );
      }
  
      private boolean isIncluded( String classFile )
      {
          if ( includes == null || includes.isEmpty() )
          {
              return true;
          }
  
          return matchPaths( includes, classFile );
      }
  
      private boolean isExcluded( String classFile )
      {
          if ( excludes == null || excludes.isEmpty() )
          {
              return false;
          }
  
          return matchPaths( excludes, classFile );
      }
  
      private boolean matchPaths( Set<String> patterns, String classFile )
      {
          for ( String pattern : patterns )
          {
  
              if ( SelectorUtils.matchPath( pattern, classFile ) )
              {
                  return true;
             }
         }
 
         return false;
     }
 
     private String normalizePath( String path )
     {
         return ( path != null ) ? path.replace( File.separatorChar == '/' ? '\\' : '/', File.separatorChar ) : null;
     }
 
     private Set<String> normalizePatterns( Set<String> patterns )
     {
         Set<String> result = new HashSet<String>();
 
         if ( patterns != null )
         {
             for ( String pattern : patterns )
             {
                 pattern = normalizePath( pattern );
 
                 if ( pattern.endsWith( File.separator ) )
                 {
                     pattern += "**";
                 }
 
                 result.add( pattern );
             }
         }
 
         return result;
     }
 
     public void finished()
     {
     }
 }