/** 
 * 
 * Copyright 2004 Protique Ltd
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License. 
 * You may obtain a copy of the License at 
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, 
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 * See the License for the specific language governing permissions and 
 * limitations under the License. 
 * 
 **/

package org.activemq.filter;

import javax.jms.JMSException;
import javax.jms.Message;


/**
 * Represents a filter using an expression
 *
 * @version $Revision: 1.1.1.1 $
 */
public class ExpressionFilter implements Filter {

    private Expression expression;

    public ExpressionFilter(Expression expression) {
        this.expression = expression;
    }

    public boolean matches(Message message) throws JMSException {
        Object value = expression.evaluate(message);
        if (value != null && value instanceof Boolean) {
            return ((Boolean) value).booleanValue();
        }
        return false;
    }

    public boolean isWildcard() {
        return false;
    }

    /**
     * @return Returns the expression.
     */
    public Expression getExpression() {
        return expression;
    }
    
    /* (non-Javadoc)
	 * @see java.lang.Object#toString()
	 */
	public String toString() {
		return "Filter: "+expression;
	}
}
