Add parameters stored in the Map to the uri string. : URI « Network « Java Tutorial

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2. Network
3. URI

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Map;
import java.util.StringTokenizer;

/*

 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.

 */

public class Main {


  /**
   * Add parameters stored in the Map to the uri string.
   * Map can contain Object values which will be converted to the string,
   * or Object arrays, which will be treated as multivalue attributes.
   * 
   * @param uri The uri to add parameters into
   * @param parameters The map containing parameters to be added
   * @return The uri with added parameters
   */
  public static String parameterize(String uri, Map parameters) {
      if (parameters.size() == 0) {
          return uri;
      }
      
      StringBuffer buffer = new StringBuffer(uri);
      if (uri.indexOf('?') == -1) {
          buffer.append('?');
      } else {
          buffer.append('&');
      }
      
      for (Iterator i = parameters.entrySet().iterator(); i.hasNext();) {
          Map.Entry entry = (Map.Entry)i.next();
          if (entry.getValue().getClass().isArray()) {
              Object[] value = (Object[])entry.getValue();
              for (int j = 0; j < value.length; j++) {
                  if (j > 0) {
                      buffer.append('&');
                  }
                  buffer.append(entry.getKey());
                  buffer.append('=');
                  buffer.append(value[j]);
              }
          } else {
              buffer.append(entry.getKey());
              buffer.append('=');
              buffer.append(entry.getValue());
          }
          if (i.hasNext()) {
              buffer.append('&');
          }
      }
      return buffer.toString();
  }



}