001 package org.apache.commons.ognl; 002 003 /* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022 import java.util.Iterator; 023 import java.util.Map; 024 025 /** 026 * Implementation of PropertyAccessor that provides "property" reference to "next" and "hasNext". 027 * 028 * @author Luke Blanshard (blanshlu@netscape.net) 029 * @author Drew Davidson (drew@ognl.org) 030 */ 031 public class IteratorPropertyAccessor 032 extends ObjectPropertyAccessor 033 implements PropertyAccessor // This is here to make javadoc show this class as an implementor 034 { 035 @Override 036 public Object getProperty( Map<String, Object> context, Object target, Object name ) 037 throws OgnlException 038 { 039 Object result; 040 Iterator<?> iterator = (Iterator<?>) target; // check performed by the invoker 041 042 if ( name instanceof String ) 043 { 044 if ( "next".equals( name ) ) 045 { 046 result = iterator.next(); 047 } 048 else 049 { 050 if ( "hasNext".equals( name ) ) 051 { 052 result = iterator.hasNext() ? Boolean.TRUE : Boolean.FALSE; 053 } 054 else 055 { 056 result = super.getProperty( context, target, name ); 057 } 058 } 059 } 060 else 061 { 062 result = super.getProperty( context, target, name ); 063 } 064 return result; 065 } 066 067 @Override 068 public void setProperty( Map<String, Object> context, Object target, Object name, Object value ) 069 throws OgnlException 070 { 071 throw new IllegalArgumentException( "can't set property " + name + " on Iterator" ); 072 } 073 }