1 /*
   2  * reserved comment block
   3  * DO NOT REMOVE OR ALTER!
   4  */
   5 /*
   6  * Copyright 1999-2004 The Apache Software Foundation.
   7  *
   8  * Licensed under the Apache License, Version 2.0 (the "License");
   9  * you may not use this file except in compliance with the License.
  10  * You may obtain a copy of the License at
  11  *
  12  *     http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  */
  20 
  21 package com.sun.org.apache.regexp.internal;
  22 
  23 /**
  24  * This is a class that contains utility helper methods for this package.
  25  *
  26  * @author <a href="mailto:jonl@muppetlabs.com">Jonathan Locke</a>
  27  */
  28 public class REUtil
  29 {
  30     /** complex: */
  31     private static final String complexPrefix = "complex:";
  32 
  33     /**
  34      * Creates a regular expression, permitting simple or complex syntax
  35      * @param expression The expression, beginning with a prefix if it's complex or
  36      * having no prefix if it's simple
  37      * @param matchFlags Matching style flags
  38      * @return The regular expression object
  39      * @exception RESyntaxException thrown in case of error
  40      */
  41     public static RE createRE(String expression, int matchFlags) throws RESyntaxException
  42     {
  43         if (expression.startsWith(complexPrefix))
  44         {
  45             return new RE(expression.substring(complexPrefix.length()), matchFlags);
  46         }
  47         return new RE(RE.simplePatternToFullRegularExpression(expression), matchFlags);
  48     }
  49 
  50     /**
  51      * Creates a regular expression, permitting simple or complex syntax
  52      * @param expression The expression, beginning with a prefix if it's complex or
  53      * having no prefix if it's simple
  54      * @return The regular expression object
  55      * @exception RESyntaxException thrown in case of error
  56      */
  57     public static RE createRE(String expression) throws RESyntaxException
  58     {
  59         return createRE(expression, RE.MATCH_NORMAL);
  60     }
  61 }