/*
 * Copyright 2005-2010 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.server.endpoint.adapter;

import java.lang.reflect.Method;

import org.springframework.oxm.GenericMarshaller;
import org.springframework.oxm.GenericUnmarshaller;
import org.springframework.oxm.Marshaller;
import org.springframework.oxm.Unmarshaller;
import org.springframework.oxm.jaxb.Jaxb2Marshaller;
import org.springframework.ws.server.endpoint.MethodEndpoint;

/**
 * Subclass of {@link MarshallingMethodEndpointAdapter} that supports {@link GenericMarshaller} and {@link
 * GenericUnmarshaller}. More specifically, this adapter is aware of the {@link Method#getGenericParameterTypes()} and
 * {@link Method#getGenericReturnType()}.
 *
 * <p>Prefer to use this adapter rather than the plain {@link MarshallingMethodEndpointAdapter} in combination with Java 5
 * marshallers, such as the {@link Jaxb2Marshaller}.
 *
 * @author Arjen Poutsma
 * @since 1.0.2
 * @deprecated as of Spring Web Services 2.0, in favor of {@link DefaultMethodEndpointAdapter} and {@link
 *			   org.springframework.ws.server.endpoint.adapter.method.MarshallingPayloadMethodProcessor
 *			   MarshallingPayloadMethodProcessor}.
 */
@Deprecated
public class GenericMarshallingMethodEndpointAdapter extends MarshallingMethodEndpointAdapter {

	/**
	 * Creates a new {@code GenericMarshallingMethodEndpointAdapter}. The {@link Marshaller} and {@link
	 * Unmarshaller} must be injected using properties.
	 *
	 * @see #setMarshaller(org.springframework.oxm.Marshaller)
	 * @see #setUnmarshaller(org.springframework.oxm.Unmarshaller)
	 */
	public GenericMarshallingMethodEndpointAdapter() {
	}

	/**
	 * Creates a new {@code GenericMarshallingMethodEndpointAdapter} with the given marshaller. If the given {@link
	 * Marshaller} also implements the {@link Unmarshaller} interface, it is used for both marshalling and
	 * unmarshalling. Otherwise, an exception is thrown.
	 *
	 * <p>Note that all {@link Marshaller} implementations in Spring-WS also implement the {@link Unmarshaller} interface,
	 * so that you can safely use this constructor.
	 *
	 * @param marshaller object used as marshaller and unmarshaller
	 * @throws IllegalArgumentException when {@code marshaller} does not implement the {@link Unmarshaller}
	 *									interface
	 */
	public GenericMarshallingMethodEndpointAdapter(Marshaller marshaller) {
		super(marshaller);
	}

	/**
	 * Creates a new {@code GenericMarshallingMethodEndpointAdapter} with the given marshaller and unmarshaller.
	 *
	 * @param marshaller   the marshaller to use
	 * @param unmarshaller the unmarshaller to use
	 */
	public GenericMarshallingMethodEndpointAdapter(Marshaller marshaller, Unmarshaller unmarshaller) {
		super(marshaller, unmarshaller);
	}

	@Override
	protected boolean supportsInternal(MethodEndpoint methodEndpoint) {
		Method method = methodEndpoint.getMethod();
		return supportsReturnType(method) && supportsParameters(method);
	}

	private boolean supportsReturnType(Method method) {
		if (Void.TYPE.equals(method.getReturnType())) {
			return true;
		}
		else {
			if (getMarshaller() instanceof GenericMarshaller) {
				return ((GenericMarshaller) getMarshaller()).supports(method.getGenericReturnType());
			}
			else {
				return getMarshaller().supports(method.getReturnType());
			}
		}
	}

	private boolean supportsParameters(Method method) {
		if (method.getParameterTypes().length != 1) {
			return false;
		}
		else if (getUnmarshaller() instanceof GenericUnmarshaller) {
			GenericUnmarshaller genericUnmarshaller = (GenericUnmarshaller) getUnmarshaller();
			return genericUnmarshaller.supports(method.getGenericParameterTypes()[0]);
		}
		else {
			return getUnmarshaller().supports(method.getParameterTypes()[0]);
		}
	}
}