org.springframework.web.method.support

Class ModelAndViewContainer

java.lang.Object

org.springframework.web.method.support.ModelAndViewContainer

public class ModelAndViewContainer
extends java.lang.Object

Records model and view related decisions made by HandlerMethodArgumentResolvers and HandlerMethodReturnValueHandlers during the course of invocation of a controller method.

The setRequestHandled(boolean) flag can be used to indicate the request has been handled directly and view resolution is not required.

A default Model is automatically created at instantiation. An alternate model instance may be provided via setRedirectModel(org.springframework.ui.ModelMap) for use in a redirect scenario. When setRedirectModelScenario(boolean) is set to true signalling a redirect scenario, the getModel() returns the redirect model instead of the default model.

Since:

3.1

Author:

Rossen Stoyanchev

Field Summary

Fields

Modifier and Type	Field and Description
private ModelMap	defaultModel
private boolean	ignoreDefaultModelOnRedirect
private ModelMap	redirectModel
private boolean	redirectModelScenario
private boolean	requestHandled
private SessionStatus	sessionStatus
private java.lang.Object	view

Constructor Summary

Constructors

Constructor and Description
ModelAndViewContainer()

Method Summary

Modifier and Type	Method and Description
ModelAndViewContainer	addAllAttributes(java.util.Map<java.lang.String,?> attributes) Copy all attributes to the underlying model.
ModelAndViewContainer	addAttribute(java.lang.Object value) Add the supplied attribute to the underlying model.
ModelAndViewContainer	addAttribute(java.lang.String name, java.lang.Object value) Add the supplied attribute to the underlying model.
boolean	containsAttribute(java.lang.String name) Whether the underlying model contains the given attribute name.
ModelMap	getDefaultModel() Return the "default" model created at instantiation.
ModelMap	getModel() Return the model to use -- either the "default" or the "redirect" model.
SessionStatus	getSessionStatus() Return the SessionStatus instance to use that can be used to signal that session processing is complete.
java.lang.Object	getView() Return the View object, or null if we using a view name to be resolved by the DispatcherServlet via a ViewResolver.
java.lang.String	getViewName() Return the view name to be resolved by the DispatcherServlet via a ViewResolver, or null if a View object is set.
boolean	isRequestHandled() Whether the request has been handled fully within the handler.
boolean	isViewReference() Whether the view is a view reference specified via a name to be resolved by the DispatcherServlet via a ViewResolver.
ModelAndViewContainer	mergeAttributes(java.util.Map<java.lang.String,?> attributes) Copy attributes in the supplied Map with existing objects of the same name taking precedence (i.e.
ModelAndViewContainer	removeAttributes(java.util.Map<java.lang.String,?> attributes) Remove the given attributes from the model.
void	setIgnoreDefaultModelOnRedirect(boolean ignoreDefaultModelOnRedirect) By default the content of the "default" model is used both during rendering and redirect scenarios.
void	setRedirectModel(ModelMap redirectModel) Provide a separate model instance to use in a redirect scenario.
void	setRedirectModelScenario(boolean redirectModelScenario) Whether the controller has returned a redirect instruction, e.g.
void	setRequestHandled(boolean requestHandled) Whether the request has been handled fully within the handler, e.g.
void	setView(java.lang.Object view) Set a View object to be used by the DispatcherServlet.
void	setViewName(java.lang.String viewName) Set a view name to be resolved by the DispatcherServlet via a ViewResolver.
java.lang.String	toString() Return diagnostic information.
private boolean	useDefaultModel() Whether to use the default model or the redirect model.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

ignoreDefaultModelOnRedirect

private boolean ignoreDefaultModelOnRedirect

view

private java.lang.Object view

defaultModel

private final ModelMap defaultModel

redirectModel

private ModelMap redirectModel

redirectModelScenario

private boolean redirectModelScenario

sessionStatus

private final SessionStatus sessionStatus

requestHandled

private boolean requestHandled

Constructor Detail

ModelAndViewContainer

public ModelAndViewContainer()

Method Detail

setIgnoreDefaultModelOnRedirect

public void setIgnoreDefaultModelOnRedirect(boolean ignoreDefaultModelOnRedirect)

By default the content of the "default" model is used both during rendering and redirect scenarios. Alternatively controller methods can declare an argument of type RedirectAttributes and use it to provide attributes to prepare the redirect URL.

Setting this flag to true guarantees the "default" model is never used in a redirect scenario even if a RedirectAttributes argument is not declared. Setting it to false means the "default" model may be used in a redirect if the controller method doesn't declare a RedirectAttributes argument.

The default setting is false.

setViewName

public void setViewName(java.lang.String viewName)

Set a view name to be resolved by the DispatcherServlet via a ViewResolver. Will override any pre-existing view name or View.

getViewName

public java.lang.String getViewName()

Return the view name to be resolved by the DispatcherServlet via a ViewResolver, or null if a View object is set.

setView

public void setView(java.lang.Object view)

Set a View object to be used by the DispatcherServlet. Will override any pre-existing view name or View.

getView

public java.lang.Object getView()

Return the View object, or null if we using a view name to be resolved by the DispatcherServlet via a ViewResolver.

isViewReference

public boolean isViewReference()

Whether the view is a view reference specified via a name to be resolved by the DispatcherServlet via a ViewResolver.

getModel

public ModelMap getModel()

Return the model to use -- either the "default" or the "redirect" model. The default model is used if redirectModelScenario=false or there is no redirect model (i.e. RedirectAttributes was not declared as a method argument) and ignoreDefaultModelOnRedirect=false.

useDefaultModel

private boolean useDefaultModel()

Whether to use the default model or the redirect model.

getDefaultModel

public ModelMap getDefaultModel()

Return the "default" model created at instantiation.

In general it is recommended to use getModel() instead which returns either the "default" model (template rendering) or the "redirect" model (redirect URL preparation). Use of this method may be needed for advanced cases when access to the "default" model is needed regardless, e.g. to save model attributes specified via @SessionAttributes.

Returns:

the default model, never null

setRedirectModel

public void setRedirectModel(ModelMap redirectModel)

Provide a separate model instance to use in a redirect scenario. The provided additional model however is not used used unless setRedirectModelScenario(boolean) gets set to true to signal a redirect scenario.

setRedirectModelScenario

public void setRedirectModelScenario(boolean redirectModelScenario)

Whether the controller has returned a redirect instruction, e.g. a "redirect:" prefixed view name, a RedirectView instance, etc.

getSessionStatus

public SessionStatus getSessionStatus()

Return the SessionStatus instance to use that can be used to signal that session processing is complete.

setRequestHandled

public void setRequestHandled(boolean requestHandled)

Whether the request has been handled fully within the handler, e.g. @ResponseBody method, and therefore view resolution is not necessary. This flag can also be set when controller methods declare an argument of type ServletResponse or OutputStream).

The default value is false.

isRequestHandled

public boolean isRequestHandled()

Whether the request has been handled fully within the handler.

addAttribute

public ModelAndViewContainer addAttribute(java.lang.String name,
                                          java.lang.Object value)

Add the supplied attribute to the underlying model. A shortcut for getModel().addAttribute(String, Object).

addAttribute

public ModelAndViewContainer addAttribute(java.lang.Object value)

Add the supplied attribute to the underlying model. A shortcut for getModel().addAttribute(Object).

addAllAttributes

public ModelAndViewContainer addAllAttributes(java.util.Map<java.lang.String,?> attributes)

Copy all attributes to the underlying model. A shortcut for getModel().addAllAttributes(Map).

mergeAttributes

public ModelAndViewContainer mergeAttributes(java.util.Map<java.lang.String,?> attributes)

Copy attributes in the supplied Map with existing objects of the same name taking precedence (i.e. not getting replaced). A shortcut for getModel().mergeAttributes(Map<String, ?>).

removeAttributes

public ModelAndViewContainer removeAttributes(java.util.Map<java.lang.String,?> attributes)

Remove the given attributes from the model.

containsAttribute

public boolean containsAttribute(java.lang.String name)

Whether the underlying model contains the given attribute name. A shortcut for getModel().containsAttribute(String).

toString

public java.lang.String toString()

Return diagnostic information.

Overrides:

toString in class java.lang.Object