Remove parameters from a uri in Java

import java.util.Map;
/*w w  w. ja va2s .  c o m*/
class Util{

  /**
   * Remove parameters from a uri.
   * Passed in parameters map will be populated with parameter names as keys and
   * parameter values as map values. Values are of type String array
   * (similarly to {@link javax.servlet.ServletRequest#getParameterMap()}).
   * 
   * @param uri The uri path to deparameterize.
   * @param parameters The map that collects parameters.
   * @return The cleaned uri
   */
  public static String deparameterize(String uri, Map parameters) {
      int i = uri.lastIndexOf('?');
      if (i == -1) {
          return uri;
      }

      parameters.clear();
      String[] params = uri.substring(i + 1).split("&");
      for (int j = 0; j < params.length; j++) {
          String p = params[j];
          int k = p.indexOf('=');
          if (k == -1) {
              break;
          }
          String name = p.substring(0, k);
          String value = p.substring(k + 1);
          Object values = parameters.get(name);
          if (values == null) {
              parameters.put(name, new String[]{value});
          } else {
              String[] v1 = (String[])values;
              String[] v2 = new String[v1.length + 1];
              System.arraycopy(v1, 0, v2, 0, v1.length);
              v2[v1.length] = value;
              parameters.put(name, v2);
          }
      }

      return uri.substring(0, i);
  }


}

/*

 Derby - Class org.apache.derby.iapi.util.PropertyUtil

 Licensed to the Apache Software Foundation (ASF) under one or more
 contributor license agreements.  See the NOTICE file distributed with
 this work for additional information regarding copyright ownership.
 The ASF licenses this file to you 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.

 */