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.Map;
023    import java.util.Set;
024    
025    /**
026     * Implementation of PropertyAccessor that uses numbers and dynamic subscripts as properties to index into Lists.
027     * 
028     * @author Luke Blanshard (blanshlu@netscape.net)
029     * @author Drew Davidson (drew@ognl.org)
030     */
031    public class SetPropertyAccessor
032        extends ObjectPropertyAccessor
033        implements PropertyAccessor // This is here to make javadoc show this class as an implementor
034    {
035    
036        @Override
037        public Object getProperty( Map<String, Object> context, Object target, Object name )
038            throws OgnlException
039        {
040            Set<?> set = (Set<?>) target; // check performed by the invoker
041    
042            if ( name instanceof String )
043            {
044                Object result;
045    
046                if ( "size".equals( name ) )
047                {
048                    result = set.size();
049                }
050                else if ( "iterator".equals( name ) )
051                {
052                    result = set.iterator();
053                }
054                else if ( "isEmpty".equals( name ) )
055                {
056                    result = set.isEmpty() ? Boolean.TRUE : Boolean.FALSE;
057                }
058                else
059                {
060                    result = super.getProperty( context, target, name );
061                }
062                return result;
063            }
064    
065            throw new NoSuchPropertyException( target, name );
066        }
067    
068    }