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    1   /*
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *     http://www.apache.org/licenses/LICENSE-2.0
    10   *
    11   * Unless required by applicable law or agreed to in writing, software
    12   * distributed under the License is distributed on an "AS IS" BASIS,
    13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14   * See the License for the specific language governing permissions and
    15   * limitations under the License.
    16   */
    17
    18  package org.apache.commons.configuration.web;
    19
    20  import java.util.Iterator;
    21  import java.util.Arrays;
    22  import javax.servlet.ServletRequest;
    23
    24  import org.apache.commons.collections.iterators.EnumerationIterator;
    25
    26  /***
    27   * A configuration wrapper to read the parameters of a servlet request. This
    28   * configuration is read only, adding or removing a property will throw an
    29   * UnsupportedOperationException.
    30   *
    31   * @author <a href="mailto:ebourg@apache.org">Emmanuel Bourg</a>
    32   * @version $Revision: 439648 $, $Date: 2006-09-02 22:42:10 +0200 (Sa, 02 Sep 2006) $
    33   * @since 1.1
    34   */
    35  public class ServletRequestConfiguration extends BaseWebConfiguration
    36  {
    37      /*** Stores the wrapped request.*/
    38      protected ServletRequest request;
    39
    40      /***
    41       * Create a ServletRequestConfiguration using the request parameters.
    42       *
    43       * @param request the servlet request
    44       */
    45      public ServletRequestConfiguration(ServletRequest request)
    46      {
    47          this.request = request;
    48      }
    49
    50      public Object getProperty(String key)
    51      {
    52          String[] values = request.getParameterValues(key);
    53
    54          if (values == null || values.length == 0)
    55          {
    56              return null;
    57          }
    58          else if (values.length == 1)
    59          {
    60              return values[0];
    61          }
    62          else
    63          {
    64              return Arrays.asList(values);
    65          }
    66      }
    67
    68      public Iterator getKeys()
    69      {
    70          return new EnumerationIterator(request.getParameterNames());
    71      }
    72  }