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.Iterator;
23 import java.util.Map;
24
25 /**
26 * Implementation of PropertyAccessor that provides "property" reference to "next" and "hasNext".
27 *
28 * @author Luke Blanshard (blanshlu@netscape.net)
29 * @author Drew Davidson (drew@ognl.org)
30 */
31 public class IteratorPropertyAccessor
32 extends ObjectPropertyAccessor
33 implements PropertyAccessor // This is here to make javadoc show this class as an implementor
34 {
35 @Override
36 public Object getProperty( Map<String, Object> context, Object target, Object name )
37 throws OgnlException
38 {
39 Object result;
40 Iterator<?> iterator = (Iterator<?>) target; // check performed by the invoker
41
42 if ( name instanceof String )
43 {
44 if ( "next".equals( name ) )
45 {
46 result = iterator.next();
47 }
48 else
49 {
50 if ( "hasNext".equals( name ) )
51 {
52 result = iterator.hasNext() ? Boolean.TRUE : Boolean.FALSE;
53 }
54 else
55 {
56 result = super.getProperty( context, target, name );
57 }
58 }
59 }
60 else
61 {
62 result = super.getProperty( context, target, name );
63 }
64 return result;
65 }
66
67 @Override
68 public void setProperty( Map<String, Object> context, Object target, Object name, Object value )
69 throws OgnlException
70 {
71 throw new IllegalArgumentException( "can't set property " + name + " on Iterator" );
72 }
73 }