package org.codehaus.plexus.util;
   
   /*
    * Copyright The Codehaus 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 java.io.File;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.StringTokenizer;
  
  /**
   * <p>Describes a match target for SelectorUtils.</p>
   * 
   * <p>Significantly more efficient than using strings, since re-evaluation and re-tokenizing is avoided.</p>
   *
   * @author Kristian Rosenvold
   */
  public class MatchPattern
  {
      private final String source;
  
      private final String regexPattern;
  
      private final String separator;
  
      private final String[] tokenized;
  
      private final char[][] tokenizedChar;
  
      private MatchPattern( String source, String separator )
      {
          regexPattern = SelectorUtils.isRegexPrefixedPattern( source )
                          ? source.substring( SelectorUtils.REGEX_HANDLER_PREFIX.length(),
                                              source.length() - SelectorUtils.PATTERN_HANDLER_SUFFIX.length() )
                          : null;
          this.source = SelectorUtils.isAntPrefixedPattern( source )
                          ? source.substring( SelectorUtils.ANT_HANDLER_PREFIX.length(),
                                              source.length() - SelectorUtils.PATTERN_HANDLER_SUFFIX.length() )
                          : source;
          this.separator = separator;
          tokenized = tokenizePathToString( this.source, separator );
          tokenizedChar = new char[tokenized.length][];
          for ( int i = 0; i < tokenized.length; i++ )
          {
              tokenizedChar[i] = tokenized[i].toCharArray();
          }
  
      }
  
      public boolean matchPath( String str, boolean isCaseSensitive )
      {
          if ( regexPattern != null )
          {
              return str.matches( regexPattern );
          }
          else
          {
              return SelectorUtils.matchAntPathPattern( this, str, separator, isCaseSensitive );
          }
      }
  
      boolean matchPath( String str, char[][] strDirs, boolean isCaseSensitive )
      {
          if ( regexPattern != null )
          {
              return str.matches( regexPattern );
          }
          else
          {
              return SelectorUtils.matchAntPathPattern( getTokenizedPathChars(), strDirs, isCaseSensitive );
          }
      }
  
      public boolean matchPatternStart( String str, boolean isCaseSensitive )
      {
          if ( regexPattern != null )
          {
              // FIXME: ICK! But we can't do partial matches for regex, so we have to reserve judgement until we have
              // a file to deal with, or we can definitely say this is an exclusion...
              return true;
          }
          else
          {
              String altStr = str.replace( '\\', '/' );
  
              return SelectorUtils.matchAntPathPatternStart( this, str, File.separator, isCaseSensitive )
                 || SelectorUtils.matchAntPathPatternStart( this, altStr, "/", isCaseSensitive );
         }
     }
 
     public String[] getTokenizedPathString()
     {
         return tokenized;
     }
 
     public char[][] getTokenizedPathChars()
     {
         return tokenizedChar;
     }
 
     public boolean startsWith( String string )
     {
         return source.startsWith( string );
     }
 
     static String[] tokenizePathToString( String path, String separator )
     {
         List<String> ret = new ArrayList<String>();
         StringTokenizer st = new StringTokenizer( path, separator );
         while ( st.hasMoreTokens() )
         {
             ret.add( st.nextToken() );
         }
         return ret.toArray( new String[0] );
     }
 
     static char[][] tokenizePathToCharArray( String path, String separator )
     {
         String[] tokenizedName = tokenizePathToString( path, separator );
         char[][] tokenizedNameChar = new char[tokenizedName.length][];
         for ( int i = 0; i < tokenizedName.length; i++ )
         {
             tokenizedNameChar[i] = tokenizedName[i].toCharArray();
         }
         return tokenizedNameChar;
     }
 
     public static MatchPattern fromString( String source )
     {
         return new MatchPattern( source, File.separator );
     }
 
 }