/*
 * Copyright 2005-2014 the original author or authors.
 *
 * 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.springframework.ws.soap.server.endpoint.mapping;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;
import org.springframework.ws.context.MessageContext;
import org.springframework.ws.server.EndpointInvocationChain;
import org.springframework.ws.server.EndpointMapping;
import org.springframework.ws.soap.server.SoapEndpointInvocationChain;
import org.springframework.ws.soap.server.SoapEndpointMapping;

/**
 * {@code EndpointMapping} implement that adds SOAP actors or roles to a delegate endpoint. Delegates to another
 * {@code EndpointMapping}, set by {@code delegate}, and adds the actors or roles specified by
 * {@code actorsOrRoles}.
 *
 * <p>This endpoint mapping makes it possible to set actors/roles on a specific endpoint, without making the all endpoint
 * mappings depend on SOAP-specific functionality. For normal use, setting an actor or role on an endpoint is not
 * required, the default 'next' role is sufficient.
 *
 * <p>It is only in a scenario when a certain endpoint act as a SOAP intermediary for another endpoint, as described in the
 * SOAP specificication, this mapping is useful.
 *
 * @author Arjen Poutsma
 * @see org.springframework.ws.soap.SoapHeader#examineMustUnderstandHeaderElements(String)
 * @see org.springframework.ws.soap.SoapVersion#getNextActorOrRoleUri()
 * @since 1.0.0
 */
public class DelegatingSoapEndpointMapping implements InitializingBean, SoapEndpointMapping {

	private EndpointMapping delegate;

	private String[] actorsOrRoles;

	private boolean isUltimateReceiver = true;

	/** Sets the delegate {@code EndpointMapping} to resolve the endpoint with. */
	public void setDelegate(EndpointMapping delegate) {
		this.delegate = delegate;
	}

	@Override
	public final void setActorOrRole(String actorOrRole) {
		Assert.notNull(actorOrRole, "actorOrRole must not be null");
		actorsOrRoles = new String[]{actorOrRole};
	}

	@Override
	public final void setActorsOrRoles(String[] actorsOrRoles) {
		Assert.notEmpty(actorsOrRoles, "actorsOrRoles must not be empty");
		this.actorsOrRoles = actorsOrRoles;
	}

	@Override
	public final void setUltimateReceiver(boolean ultimateReceiver) {
		isUltimateReceiver = ultimateReceiver;
	}

	/**
	 * Creates a new {@code SoapEndpointInvocationChain} based on the delegate endpoint, the delegate interceptors,
	 * and set actors/roles.
	 *
	 * @see #setActorsOrRoles(String[])
	 */
	@Override
	public EndpointInvocationChain getEndpoint(MessageContext messageContext) throws Exception {
		EndpointInvocationChain delegateChain = delegate.getEndpoint(messageContext);
		if (delegateChain != null) {
			return new SoapEndpointInvocationChain(delegateChain.getEndpoint(), delegateChain.getInterceptors(),
					actorsOrRoles, isUltimateReceiver);
		}
		else {
			return null;
		}
	}

	@Override
	public void afterPropertiesSet() throws Exception {
		Assert.notNull(delegate, "delegate is required");
	}
}