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Apache Neethi provides general framework for the programmers to use WS Policy. It is compliant with latest WS Policy specification which was published in March 2006. This framework is specifically written to enable the Apache Web services stack to use WS Policy as a way of expressing it's requirements and capabilities.

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/**
 * 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.neethi;

import java.util.List;

/**
 * PolicyOperator is an interface that all Policy operators must implement. It
 * can contain any number of Assertions or PolicyOperators and it has an
 * Implicit logic of how those PolicyComponents should be met.
 * 
 */
public interface PolicyOperator extends PolicyComponent {

    /**
     * Add a PolicyComponent to the PolicyOperator.
     * 
     * @param component Component to add to the operator
     */
    void addPolicyComponent(PolicyComponent component);

    /**
     * Returns a List of PolicyComponents which this PolicyOperator contains.
     * 
     * @return the List of PolicyComponents that this PolicyOperator contains.
     */
    List getPolicyComponents();

    /**
     * Returns true if the PolicyOperator doesn't contain any PolicyComponents.
     * 
     * @return true if this PolicyOperator doesn't contain any PolicyComponenets
     */
    boolean isEmpty();
}