1 package org.apache.commons.ognl;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.Enumeration;
23 import java.util.Map;
24
25 /**
26 * Implementation of PropertyAccessor that provides "property" reference to "nextElement" (aliases to "next" also) and
27 * "hasMoreElements" (also aliased to "hasNext").
28 *
29 * @author Luke Blanshard (blanshlu@netscape.net)
30 * @author Drew Davidson (drew@ognl.org)
31 */
32 public class EnumerationPropertyAccessor
33 extends ObjectPropertyAccessor
34 implements PropertyAccessor // This is here to make javadoc show this class as an implementor
35 {
36 @Override
37 public Object getProperty( Map<String, Object> context, Object target, Object name )
38 throws OgnlException
39 {
40 Object result;
41 Enumeration<?> e = (Enumeration<?>) target; // check performed by the invoker
42
43 if ( name instanceof String )
44 {
45 if ( "next".equals( name ) || "nextElement".equals( name ) )
46 {
47 result = e.nextElement();
48 }
49 else
50 {
51 if ( "hasNext".equals( name ) || "hasMoreElements".equals( name ) )
52 {
53 result = e.hasMoreElements() ? Boolean.TRUE : Boolean.FALSE;
54 }
55 else
56 {
57 result = super.getProperty( context, target, name );
58 }
59 }
60 }
61 else
62 {
63 result = super.getProperty( context, target, name );
64 }
65 return result;
66 }
67
68 @Override
69 public void setProperty( Map<String, Object> context, Object target, Object name, Object value )
70 throws OgnlException
71 {
72 throw new IllegalArgumentException( "can't set property " + name + " on Enumeration" );
73 }
74 }