/*

  * 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();

    }

 }