/*

  * Copyright 2004-2011 the Seasar Foundation and the Others.

  *

  * 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 org.seasar.teeda.core.util;

 import java.util.HashMap;

 import java.util.Map;

 import java.util.regex.Matcher;

 import java.util.regex.Pattern;

 /**

  * @author shot

  * 

  */

 public class PatternUtil {

     private static Map patternCache = new HashMap();

     private PatternUtil() {

     }

     public static Pattern getPattern(String regex) {

         Pattern pattern = (Pattern) patternCache.get(regex);

         if (pattern == null) {

             pattern = Pattern.compile(regex);

             patternCache.put(regex, pattern);

         }

         return pattern;

     }

     public static boolean matches(String regex, CharSequence value) {

         if (regex == null) {

             throw new IllegalArgumentException("regex");

         }

         Pattern pattern = getPattern(regex);

         Matcher matcher = pattern.matcher(value);

         return matcher.matches();

     }

     public static void clearPatternCache() {

         patternCache.clear();

     }

 }