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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.configuration2.web;
19  
20  import java.util.Collections;
21  import java.util.Enumeration;
22  import java.util.Iterator;
23  
24  import javax.servlet.FilterConfig;
25  
26  /**
27   * A configuration wrapper around a {@link FilterConfig}. This configuration is read only, adding or removing a property
28   * will throw an UnsupportedOperationException.
29   *
30   * @since 1.1
31   */
32  public class ServletFilterConfiguration extends BaseWebConfiguration {
33      /** Stores the wrapped filter config. */
34      protected FilterConfig config;
35  
36      /**
37       * Create a ServletFilterConfiguration using the filter initialization parameters.
38       *
39       * @param config the filter configuration
40       */
41      public ServletFilterConfiguration(final FilterConfig config) {
42          this.config = config;
43      }
44  
45      @Override
46      protected Object getPropertyInternal(final String key) {
47          return handleDelimiters(config.getInitParameter(key));
48      }
49  
50      @Override
51      protected Iterator<String> getKeysInternal() {
52          // According to the documentation of getInitParameterNames() the
53          // enumeration is of type String.
54          final Enumeration<String> en = config.getInitParameterNames();
55          return Collections.list(en).iterator();
56      }
57  }