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The OpenWS library provides a growing set of tools to work with web services at a low level. These tools include classes for creating and reading SOAP messages, transport-independent clients for connecting to web services, and various transports for use with those clients.

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/*
 * Licensed to the University Corporation for Advanced Internet Development, 
 * Inc. (UCAID) under one or more contributor license agreements.  See the 
 * NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The UCAID 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.opensaml.ws.security;

import java.util.List;

import org.opensaml.ws.message.MessageContext;

/**
 * A security policy is a collection of {@link SecurityPolicyRule}, evaluated against a {@link MessageContext}, that
 * is meant to determine if a message is well-formed, valid, and otherwise okay to process.
 * 
 * Security policies MUST be thread safe and stateless.
 */
public interface SecurityPolicy {

    /**
     * Gets the rules that are evaluated for this policy.
     * 
     * @return rules that are evaluated for this policy
     */
    public List getPolicyRules();

    /**
     * Evaluates this policy.  Rules are evaluated in the order returned by {@link #getPolicyRules()}.
     * 
     * @param messageContext the message context being evaluated
     * 
     * @throws SecurityPolicyException thrown if the requirements of the security policy, including those of
     *          any of its rules, are not satisfied by the given message context.  Also thrown if any error 
     *          is encountered during evaluation
     */
    public void evaluate(MessageContext messageContext) throws SecurityPolicyException;
}