/*
 * Copyright 2002-2009 the original author or authors.
 *
 * 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.
 */

package net.sf.json.regexp;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * JDK 1.4+ RegexpMatcher implementation.
 * 
 * @author Andres Almiray <aalmiray@users.sourceforge.net>
 */
public class JdkRegexpMatcher implements RegexpMatcher {
   private final Pattern pattern;

   public JdkRegexpMatcher( String pattern ) {
      this( pattern, false );
   }

   public JdkRegexpMatcher( String pattern, boolean multiline ) {
      if( multiline ) {
         this.pattern = Pattern.compile( pattern, Pattern.MULTILINE );
      } else {
         this.pattern = Pattern.compile( pattern );
      }
   }

   public String getGroupIfMatches( String str, int group ) {
      Matcher matcher = pattern.matcher( str );
      if( matcher.matches() ) {
         return matcher.group( group );
      }
      return "";
   }

   public boolean matches( String str ) {
      return pattern.matcher( str ).matches();
   }
}