org.ocpsoft.rewrite.faces.URLDuplicatePathCanonicalizer Maven / Gradle / Ivy

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/*
 * Copyright 2010 Lincoln Baxter, III
 * 
 * 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.ocpsoft.rewrite.faces;

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

/**
 * @author Lincoln Baxter, III 
 */
public class URLDuplicatePathCanonicalizer
{
   private final Pattern pattern = Pattern.compile("(/[^/]+/)\\.\\.(/[^/]+/)");

   /**
    * Canonicalize a given URL, replacing relative path structures with the condensed path. (Eg. /xxxx/../xxxx/ =>
    * /xxxx/)
    * 
    * @return Return the canonicalized URL. If the URL requires no canonicalization, return the original unmodified URL.
    */
   public String canonicalize(final String url)
   {
      if (url != null && url.contains("/../"))
      {
         StringBuffer result = new StringBuffer();
         Matcher m = pattern.matcher(url);
         while (m.find())
         {
            if (m.group(1).equals(m.group(2)))
            {
               m.appendReplacement(result, m.group(1));
            }
            m.appendTail(result);
         }
         return result.toString();
      }
      return url;
   }

}