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1   /*** 
2    * 
3    * Copyright 2004 Protique Ltd
4    * 
5    * Licensed under the Apache License, Version 2.0 (the "License"); 
6    * you may not use this file except in compliance with the License. 
7    * You may obtain a copy of the License at 
8    * 
9    * http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS, 
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
14   * See the License for the specific language governing permissions and 
15   * limitations under the License. 
16   * 
17   **/
18  
19  package org.codehaus.activemq.filter;
20  
21  import javax.jms.JMSException;
22  import javax.jms.Message;
23  
24  
25  /***
26   * Represents a filter using an expression
27   *
28   * @version $Revision: 1.2 $
29   */
30  public class ExpressionFilter implements Filter {
31  
32      private Expression expression;
33  
34      public ExpressionFilter(Expression expression) {
35          this.expression = expression;
36      }
37  
38      public boolean matches(Message message) throws JMSException {
39          Object value = expression.evaluate(message);
40          if (value != null && value instanceof Boolean) {
41              return ((Boolean) value).booleanValue();
42          }
43          return false;
44      }
45  
46      public boolean isWildcard() {
47          return false;
48      }
49  
50      /***
51       * @return Returns the expression.
52       */
53      public Expression getExpression() {
54          return expression;
55      }
56  }