/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.activemq.apollo.filter;


/**
 * Represents a property expression
 * 
 * @version $Revision: 1.5 $
 */
public class PropertyExpression implements Expression {

    private final String name;

    public PropertyExpression(String name) {
        this.name = name;
    }

    public Object evaluate(Filterable message) throws FilterException {
        return message.getProperty(name);
    }

    public String getName() {
        return name;
    }

    /**
     * @see java.lang.Object#toString()
     */
    public String toString() {
        return name;
    }

    /**
     * @see java.lang.Object#hashCode()
     */
    public int hashCode() {
        return name.hashCode();
    }

    /**
     * @see java.lang.Object#equals(java.lang.Object)
     */
    public boolean equals(Object o) {
        if (o == null || !this.getClass().equals(o.getClass())) {
            return false;
        }
        return name.equals(((PropertyExpression)o).name);

    }

}
