org.gwtwidgets.server.spring.RequestInjection Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of gwt-sl Show documentation

*** THIS IS AN OBSOLETE VERSION UPLOADED FOR USE WITH CEDAR-COMMON.*** The Server Library for GWT is a collection of Java server side components for the Google Web Toolkit AJAX framework with the focus on the Spring framework by facilitating publishing of Spring beans as RPC services with support for Hibernate-managed entities.

The newest version!

/*
 * 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.gwtwidgets.server.spring;

import java.lang.reflect.Method;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.aopalliance.intercept.MethodInterceptor;
import org.aopalliance.intercept.MethodInvocation;

/**
 * Method interceptor that injects the current {@link HttpServletRequest} and
 * the current {@link HttpServletResponse} via reflection to a service. You must
 * specify the setter names via {@link #setRequestSetterName(String)} and
 * {@link #setResponseSetterName(String)} otherwise they will fail silently.
 * These setters can and must have only a single argument namely
 * {@link ServletRequest} and {@link ServletResponse} respectively.
 * 
 * @author George Georgovassilis, g.georgovassilis[at]gmail.com
 * 
 */
public class RequestInjection implements MethodInterceptor {

	protected String requestSetterName;

	protected String responseSetterName;

	private void setRequestOnTarget(HttpServletRequest request, HttpServletResponse response, Object target) throws Exception {
		if (requestSetterName != null)
			try {
				Method method = target.getClass().getMethod(requestSetterName, new Class[] { HttpServletRequest.class });
				method.invoke(target, new Object[] { request });
			} catch (NoSuchMethodException e) {
			}
		if (responseSetterName != null)
			try {
				Method method = target.getClass().getMethod(responseSetterName, new Class[] { HttpServletResponse.class });
				method.invoke(target, new Object[] { response });
			} catch (NoSuchMethodException e) {
			}
	}

	public Object invoke(MethodInvocation invocation) throws Throwable {
		Object target = invocation.getThis();
		setRequestOnTarget(ServletUtils.getRequest(), ServletUtils.getResponse(), target);
		return invocation.proceed();
	}

	/**
	 * Specify the name of the setter method that can be invoked to set the
	 * current request and response on the service. If the method does not exist
	 * on the service, it is silently discarded.
	 * 
	 * @param setterName
	 */
	public void setRequestSetterName(String setterName) {
		this.requestSetterName = setterName;
	}

	/**
	 * Specify the name of the setter method that can be invoked to set the
	 * current response on the service. If the method does not exist on the
	 * service, it is silently discarded.
	 * 
	 * @param setterName
	 */
	public void setResponseSetterName(String setterName) {
		this.responseSetterName = setterName;
	}

}