001    /** 
002     * 
003     * Copyright 2004 Protique Ltd
004     * 
005     * Licensed under the Apache License, Version 2.0 (the "License"); 
006     * you may not use this file except in compliance with the License. 
007     * You may obtain a copy of the License at 
008     * 
009     * http://www.apache.org/licenses/LICENSE-2.0
010     * 
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS, 
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
014     * See the License for the specific language governing permissions and 
015     * limitations under the License. 
016     * 
017     **/
018    
019    package org.activemq.filter;
020    
021    import javax.jms.JMSException;
022    import javax.jms.Message;
023    
024    
025    /**
026     * Represents a filter using an expression
027     *
028     * @version $Revision: 1.1.1.1 $
029     */
030    public class ExpressionFilter implements Filter {
031    
032        private Expression expression;
033    
034        public ExpressionFilter(Expression expression) {
035            this.expression = expression;
036        }
037    
038        public boolean matches(Message message) throws JMSException {
039            Object value = expression.evaluate(message);
040            if (value != null && value instanceof Boolean) {
041                return ((Boolean) value).booleanValue();
042            }
043            return false;
044        }
045    
046        public boolean isWildcard() {
047            return false;
048        }
049    
050        /**
051         * @return Returns the expression.
052         */
053        public Expression getExpression() {
054            return expression;
055        }
056        
057        /* (non-Javadoc)
058             * @see java.lang.Object#toString()
059             */
060            public String toString() {
061                    return "Filter: "+expression;
062            }
063    }