/*
* Copyright 2008 biaoping.yin
*
* 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.frameworkset.web.servlet.mvc;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.PageContext;
import org.frameworkset.http.converter.HttpMessageConverter;
import org.frameworkset.spi.BeanNameAware;
import org.frameworkset.spi.support.validate.Validator;
import org.frameworkset.util.AntPathMatcher;
import org.frameworkset.util.Assert;
import org.frameworkset.util.PathMatcher;
import org.frameworkset.web.servlet.DispatchServlet;
import org.frameworkset.web.servlet.ModelAndView;
import org.frameworkset.web.servlet.handler.HandlerMeta;
import org.frameworkset.web.servlet.handler.HandlerUtils;
import org.frameworkset.web.servlet.handler.HandlerUtils.ServletHandlerMethodResolver;
import org.frameworkset.web.servlet.mvc.mutiaction.AbstractUrlMethodNameResolver;
import org.frameworkset.web.servlet.mvc.mutiaction.InternalPathMethodNameResolver;
/**
* <p>Title: MultiActionController.java</p>
* <p>Description: </p>
* <p>bboss workgroup</p>
* <p>Copyright (c) 2008</p>
* @Date 2010-10-12
* @author biaoping.yin
* @version 1.0
*/
public class MultiActionController extends AbstractController implements LastModified,BeanNameAware {
private ServletHandlerMethodResolver handlerMethodResolver =
null;
private Object locker = new Object();
/** Suffix for last-modified methods */
public static final String LAST_MODIFIED_METHOD_SUFFIX = "LastModified";
/** Default command name used for binding command objects: "command" */
public static final String DEFAULT_COMMAND_NAME = "command";
private PathMatcher pathMatcher = new AntPathMatcher();
/** HandlerMeta we'll invoke methods on. Defaults to this. */
private HandlerMeta delegate;
/** Delegate that knows how to determine method names from incoming requests */
private MethodNameResolver methodNameResolver = new InternalPathMethodNameResolver();
/** List of Validators to apply to commands */
private Validator[] validators;
// /** Optional strategy for pre-initializing data binding */
// private WebBindingInitializer webBindingInitializer;
// /** Handler methods, keyed by name */
// private final Map<String,MethodInfo> handlerMethodMap = new HashMap<String,MethodInfo>();
/** LastModified methods, keyed by handler method name (without LAST_MODIFIED_SUFFIX) */
private final Map lastModifiedMethodMap = new HashMap();
/** Methods, keyed by exception class */
private final Map exceptionHandlerMap = new HashMap();
/**
* Constructor for <code>MultiActionController</code> that looks for
* handler methods in the present subclass.
*/
public MultiActionController() {
// this.delegate = this;
// registerHandlerMethods(this.delegate);
// We'll accept no handler methods found here - a delegate might be set later on.
}
/**
* Constructor for <code>MultiActionController</code> that looks for
* handler methods in delegate, rather than a subclass of this class.
* @param delegate handler object. This does not need to implement any
* particular interface, as everything is done using reflection.
*/
public MultiActionController(HandlerMeta delegate) {
setDelegate(delegate);
}
/**
* Set the delegate used by this class; the default is <code>this</code>,
* assuming that handler methods have been added by a subclass.
* <p>This method does not get invoked once the class is configured.
* @param delegate an object containing handler methods
* @throws IllegalStateException if no handler methods are found
*/
public final void setDelegate(HandlerMeta delegate) {
Assert.notNull(delegate, "Delegate must not be null");
this.delegate = delegate;
// registerHandlerMethods(this.delegate);
// // There must be SOME handler methods.
// if (this.handlerMethodMap.isEmpty()) {
// throw new IllegalStateException("No handler methods in class [" + this.delegate.getClass() + "]");
// }
}
/**
* Set the method name resolver that this class should use.
* <p>Allows parameterization of handler method mappings.
*/
public final void setMethodNameResolver(MethodNameResolver methodNameResolver) {
this.methodNameResolver = methodNameResolver;
}
/**
* Return the MethodNameResolver used by this class.
*/
public final MethodNameResolver getMethodNameResolver() {
return this.methodNameResolver;
}
/**
* Set the {@link Validator Validators} for this controller.
* <p>The <code>Validators</code> must support the specified command class.
*/
public final void setValidators(Validator[] validators) {
this.validators = validators;
}
/**
* Return the Validators for this controller.
*/
public final Validator[] getValidators() {
return this.validators;
}
// /**
// * Specify a WebBindingInitializer which will apply pre-configured
// * configuration to every DataBinder that this controller uses.
// * <p>Allows for factoring out the entire binder configuration
// * to separate objects, as an alternative to {@link #initBinder}.
// */
// public final void setWebBindingInitializer(WebBindingInitializer webBindingInitializer) {
// this.webBindingInitializer = webBindingInitializer;
// }
//
// /**
// * Return the WebBindingInitializer (if any) which will apply pre-configured
// * configuration to every DataBinder that this controller uses.
// */
// public final WebBindingInitializer getWebBindingInitializer() {
// return this.webBindingInitializer;
// }
// /**
// * Registers all handlers methods on the delegate object.
// */
// private void registerHandlerMethods(Object delegate) {
// this.handlerMethodMap.clear();
// this.lastModifiedMethodMap.clear();
// this.exceptionHandlerMap.clear();
//
// // Look at all methods in the subclass, trying to find
// // methods that are validators according to our criteria
// Method[] methods = delegate.getClass().getMethods();
// for (int i = 0; i < methods.length; i++) {
// // We're looking for methods with given parameters.
// Method method = methods[i];
// if (isExceptionHandlerMethod(method)) {
// registerExceptionHandlerMethod(method);
// }
// else if (HandlerUtils.isHandlerMethod(method)) {
// registerHandlerMethod(method);
// registerLastModifiedMethodIfExists(delegate, method);
// }
// }
// }
// /**
// * Is the supplied method a valid exception handler method?
// */
// private boolean isExceptionHandlerMethod(Method method) {
// return (HandlerUtils.isHandlerMethod(method) &&
// method.getParameterTypes().length == 3 &&
// Throwable.class.isAssignableFrom(method.getParameterTypes()[2]));
// }
// /**
// * Registers the supplied method as a request handler.
// */
// private void registerHandlerMethod(Method method) {
// if (logger.isDebugEnabled()) {
// logger.debug("Found action method [" + method + "]");
// }
// MethodInfo methodInfo = new MethodInfo(method);
// this.handlerMethodMap.put(method.getName(), methodInfo);
// }
// /**
// * Registers a last-modified handler method for the supplied handler method
// * if one exists.
// */
// private void registerLastModifiedMethodIfExists(Object delegate, Method method) {
// // Look for corresponding LastModified method.
// try {
// Method lastModifiedMethod = delegate.getClass().getMethod(
// method.getName() + LAST_MODIFIED_METHOD_SUFFIX,
// new Class[] {HttpServletRequest.class});
// Class returnType = lastModifiedMethod.getReturnType();
// if (!(long.class.equals(returnType) || Long.class.equals(returnType))) {
// throw new IllegalStateException("last-modified method [" + lastModifiedMethod +
// "] declares an invalid return type - needs to be 'long' or 'Long'");
// }
// // Put in cache, keyed by handler method name.
// this.lastModifiedMethodMap.put(method.getName(), lastModifiedMethod);
// if (logger.isDebugEnabled()) {
// logger.debug("Found last-modified method for handler method [" + method + "]");
// }
// }
// catch (NoSuchMethodException ex) {
// // No last modified method. That's ok.
// }
// }
// /**
// * Registers the supplied method as an exception handler.
// */
// private void registerExceptionHandlerMethod(Method method) {
// this.exceptionHandlerMap.put(method.getParameterTypes()[2], method);
// if (logger.isDebugEnabled()) {
// logger.debug("Found exception handler method [" + method + "]");
// }
// }
//---------------------------------------------------------------------
// Implementation of LastModified
//---------------------------------------------------------------------
/**
* Try to find an XXXXLastModified method, where XXXX is the name of a handler.
* Return -1 if there's no such handler, indicating that content must be updated.
* @see LastModified#getLastModified(HttpServletRequest)
*/
public long getLastModified(HttpServletRequest request) {
try {
String handlerMethodName = this.methodNameResolver.getHandlerMethodName(request);
Method lastModifiedMethod = (Method) this.lastModifiedMethodMap.get(handlerMethodName);
if (lastModifiedMethod != null) {
try {
// Invoke the last-modified method...
Long wrappedLong = (Long) lastModifiedMethod.invoke(this.delegate, new Object[] {request});
return (wrappedLong != null ? wrappedLong.longValue() : -1);
}
catch (Exception ex) {
// We encountered an error invoking the last-modified method.
// We can't do anything useful except log this, as we can't throw an exception.
logger.error("Failed to invoke last-modified method", ex);
}
}
}
catch (NoSuchRequestHandlingMethodException ex) {
// No handler method for this request. This shouldn't happen, as this
// method shouldn't be called unless a previous invocation of this class
// has generated content. Do nothing, that's OK: We'll return default.
}
return -1L;
}
//---------------------------------------------------------------------
// Implementation of AbstractController
//---------------------------------------------------------------------
// /**
// * Determine a handler method and invoke it.
// * @see MethodNameResolver#getHandlerMethodName
// * @see #invokeNamedMethod
// * @see #handleNoSuchRequestHandlingMethod
// */
// protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response,PageContext pageContext)
// throws Exception {
// try {
// String methodName = this.methodNameResolver.getHandlerMethodName(request);
// return invokeNamedMethod(methodName, request, response,pageContext);
// }
// catch (NoSuchRequestHandlingMethodException ex) {
// return handleNoSuchRequestHandlingMethod(ex, request, response);
// }
// }
/**
* Determine a handler method and invoke it.
* @see MethodNameResolver#getHandlerMethodName
* @see #invokeNamedMethod
* @see #handleNoSuchRequestHandlingMethod
*/
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response,PageContext pageContext)
throws Exception {
// try {
// String methodName = this.methodNameResolver.getHandlerMethodName(request);
// return invokeNamedMethod(methodName, request, response,pageContext);
// }
// catch (NoSuchRequestHandlingMethodException ex) {
// return handleNoSuchRequestHandlingMethod(ex, request, response);
// }
HttpMessageConverter[] messageConverters = (HttpMessageConverter[])request.getAttribute(DispatchServlet.messageConverters_KEY);
return HandlerUtils.invokeHandlerMethod(request, response, pageContext, this.delegate, getServletHandlerMethodResolver(request),messageConverters);
}
private ServletHandlerMethodResolver getServletHandlerMethodResolver(HttpServletRequest request)
{
if(handlerMethodResolver == null)
{
synchronized(locker)
{
if(handlerMethodResolver == null)
handlerMethodResolver = new ServletHandlerMethodResolver(this.getClass(),
((AbstractUrlMethodNameResolver)methodNameResolver).getUrlPathHelper(),
pathMatcher,methodNameResolver,baseurls);
}
}
return handlerMethodResolver;
}
private String baseurls[];
public void setBeanName(String name) {
this.delegate = new HandlerMeta(this,getApplicationContext().getProBean(name).getMvcpaths());
baseurls = name.split(",");
}
// /**
// * Determine a handler method and invoke it.
// * @see MethodNameResolver#getHandlerMethodName
// * @see #invokeNamedMethod
// * @see #handleNoSuchRequestHandlingMethod
// */
// protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response,PageContext pageContext)
// throws Exception {
// try {
// String methodName = this.methodNameResolver.getHandlerMethodName(request);
// return invokeNamedMethod(methodName, request, response,pageContext);
// }
// catch (NoSuchRequestHandlingMethodException ex) {
// return handleNoSuchRequestHandlingMethod(ex, request, response);
// }
// }
// /**
// * Handle the case where no request handler method was found.
// * <p>The default implementation logs a warning and sends an HTTP 404 error.
// * Alternatively, a fallback view could be chosen, or the
// * NoSuchRequestHandlingMethodException could be rethrown as-is.
// * @param ex the NoSuchRequestHandlingMethodException to be handled
// * @param request current HTTP request
// * @param response current HTTP response
// * @return a ModelAndView to render, or <code>null</code> if handled directly
// * @throws Exception an Exception that should be thrown as result of the servlet request
// */
// protected ModelAndView handleNoSuchRequestHandlingMethod(
// NoSuchRequestHandlingMethodException ex, HttpServletRequest request, HttpServletResponse response)
// throws Exception {
//
// pageNotFoundLogger.warn(ex.getMessage());
// response.sendError(HttpServletResponse.SC_NOT_FOUND);
// return null;
// }
// /**
// * Invokes the named method.
// * <p>Uses a custom exception handler if possible; otherwise, throw an
// * unchecked exception; wrap a checked exception or Throwable.
// */
// protected final ModelAndView invokeNamedMethod(
// String methodName, HttpServletRequest request, HttpServletResponse response,PageContext pageContext) throws Exception {
//
// MethodInfo methodInfo = (MethodInfo) this.handlerMethodMap.get(methodName);
// if (methodInfo == null) {
// throw new NoSuchRequestHandlingMethodException(methodName, getClass());
// }
//
// try {
//// Class[] paramTypes = method.getParameterTypes();
//// List params = new ArrayList(4);
//// params.add(request);
//// params.add(response);
////
//// if (paramTypes.length >= 3 && paramTypes[2].equals(HttpSession.class)) {
//// HttpSession session = request.getSession(false);
//// if (session == null) {
//// throw new HttpSessionRequiredException(
//// "Pre-existing session required for handler method '" + methodName + "'");
//// }
//// params.add(session);
//// }
////
//// // If last parameter isn't of HttpSession type, it's a command.
//// if (paramTypes.length >= 3 &&
//// !paramTypes[paramTypes.length - 1].equals(HttpSession.class)) {
//// Object command = newCommandObject(paramTypes[paramTypes.length - 1]);
//// params.add(command);
//// bind(request, command);
//// }
// ModelMap model = new ModelMap();
// Object[] params = HandlerUtils.buildMethodCallArgs(request, response,pageContext, methodInfo,model,null);
//
// Object returnValue = methodInfo.getMethod().invoke(this.delegate, params);
// return massageReturnValueIfNecessary(returnValue);
//
// }
// catch (InvocationTargetException ex) {
// // The handler method threw an exception.
// return handleException(request, response, ex.getTargetException());
// }
// catch (Exception ex) {
// // The binding process threw an exception.
// return handleException(request, response, ex);
// }
// }
// /**
// * Processes the return value of a handler method to ensure that it either returns
// * <code>null</code> or an instance of {@link ModelAndView}. When returning a {@link Map},
// * the {@link Map} instance is wrapped in a new {@link ModelAndView} instance.
// */
// private ModelAndView massageReturnValueIfNecessary(Object returnValue) {
// if (returnValue instanceof ModelAndView) {
// return (ModelAndView) returnValue;
// }
// else if (returnValue instanceof Map) {
// return new ModelAndView().addAllObjects((Map) returnValue);
// }
// else if (returnValue instanceof String) {
// return new ModelAndView((String) returnValue);
// }
// else {
// // Either returned null or was 'void' return.
// // We'll assume that the handle method already wrote the response.
// return null;
// }
// }
// /**
// * Bind request parameters onto the given command bean
// * @param request request from which parameters will be bound
// * @param command command object, that must be a JavaBean
// * @throws Exception in case of invalid state or arguments
// */
// protected void bind(HttpServletRequest request, Object command) throws Exception {
// logger.debug("Binding request parameters onto MultiActionController command");
// ServletRequestDataBinder binder = createBinder(request, command);
// binder.bind(request);
// if (this.validators != null) {
// for (int i = 0; i < this.validators.length; i++) {
// if (this.validators[i].supports(command.getClass())) {
// ValidationUtils.invokeValidator(this.validators[i], command, binder.getBindingResult());
// }
// }
// }
// binder.closeNoCatch();
// }
// /**
// * Create a new binder instance for the given command and request.
// * <p>Called by <code>bind</code>. Can be overridden to plug in custom
// * ServletRequestDataBinder subclasses.
// * <p>The default implementation creates a standard ServletRequestDataBinder,
// * and invokes <code>initBinder</code>. Note that <code>initBinder</code>
// * will not be invoked if you override this method!
// * @param request current HTTP request
// * @param command the command to bind onto
// * @return the new binder instance
// * @throws Exception in case of invalid state or arguments
// * @see #bind
// * @see #initBinder
// */
// protected ServletRequestDataBinder createBinder(HttpServletRequest request, Object command) throws Exception {
// ServletRequestDataBinder binder = new ServletRequestDataBinder(command, getCommandName(command));
// initBinder(request, binder);
// return binder;
// }
// /**
// * Return the command name to use for the given command object.
// * <p>Default is "command".
// * @param command the command object
// * @return the command name to use
// * @see #DEFAULT_COMMAND_NAME
// */
// protected String getCommandName(Object command) {
// return DEFAULT_COMMAND_NAME;
// }
// /**
// * Initialize the given binder instance, for example with custom editors.
// * Called by <code>createBinder</code>.
// * <p>This method allows you to register custom editors for certain fields of your
// * command class. For instance, you will be able to transform Date objects into a
// * String pattern and back, in order to allow your JavaBeans to have Date properties
// * and still be able to set and display them in an HTML interface.
// * <p>The default implementation is empty.
// * <p>Note: the command object is not directly passed to this method, but it's available
// * @param request current HTTP request
// * @param binder new binder instance
// * @throws Exception in case of invalid state or arguments
// * @see #createBinder
// */
// protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) throws Exception {
// if (this.webBindingInitializer != null) {
// this.webBindingInitializer.initBinder(binder, new ServletWebRequest(request));
// }
//
// }
// /**
// * Determine the exception handler method for the given exception.
// * <p>Can return <code>null</code> if not found.
// * @return a handler for the given exception type, or <code>null</code>
// * @param exception the exception to handle
// */
// protected Method getExceptionHandler(Throwable exception) {
// Class exceptionClass = exception.getClass();
// if (logger.isDebugEnabled()) {
// logger.debug("Trying to find handler for exception class [" + exceptionClass.getName() + "]");
// }
// Method handler = (Method) this.exceptionHandlerMap.get(exceptionClass);
// while (handler == null && !exceptionClass.equals(Throwable.class)) {
// if (logger.isDebugEnabled()) {
// logger.debug("Trying to find handler for exception superclass [" + exceptionClass.getName() + "]");
// }
// exceptionClass = exceptionClass.getSuperclass();
// handler = (Method) this.exceptionHandlerMap.get(exceptionClass);
// }
// return handler;
// }
// /**
// * We've encountered an exception thrown from a handler method.
// * Invoke an appropriate exception handler method, if any.
// * @param request current HTTP request
// * @param response current HTTP response
// * @param ex the exception that got thrown
// * @return a ModelAndView to render the response
// */
// private ModelAndView handleException(HttpServletRequest request, HttpServletResponse response, Throwable ex)
// throws Exception {
//
// Method handler = getExceptionHandler(ex);
// if (handler != null) {
// if (logger.isDebugEnabled()) {
// logger.debug("Invoking exception handler [" + handler + "] for exception: " + ex);
// }
// try {
// Object returnValue = handler.invoke(this.delegate, new Object[] {request, response, ex});
// return massageReturnValueIfNecessary(returnValue);
// }
// catch (InvocationTargetException ex2) {
// logger.error("Original exception overridden by exception handling failure", ex);
// ReflectionUtils.rethrowException(ex2.getTargetException());
// }
// catch (Exception ex2) {
// logger.error("Failed to invoke exception handler method", ex2);
// }
// }
// else {
// // If we get here, there was no custom handler or we couldn't invoke it.
// ReflectionUtils.rethrowException(ex);
// }
// throw new IllegalStateException("Should never get here");
// }
//
}