org.springframework.web.reactive.result.view

Class HttpMessageWriterView

java.lang.Object

org.springframework.web.reactive.result.view.HttpMessageWriterView

All Implemented Interfaces:

View

public class HttpMessageWriterView
extends java.lang.Object
implements View

View that writes model attribute(s) with an HttpMessageWriter.

Since:

5.0

Author:

Rossen Stoyanchev

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	canWriteMap
private java.util.Set<java.lang.String>	modelKeys
private HttpMessageWriter<?>	writer

Constructor Summary

Constructors

Constructor and Description
HttpMessageWriterView(Encoder<?> encoder) Constructor with an Encoder.
HttpMessageWriterView(HttpMessageWriter<?> writer) Constructor with a fully initialized HttpMessageWriter.

Method Summary

Modifier and Type	Method and Description
HttpMessageWriter<?>	getMessageWriter() Return the configured message writer.
java.util.Set<java.lang.String>	getModelKeys() Return the configured model keys.
private java.lang.Object	getObjectToRender(java.util.Map<java.lang.String,?> model)
java.util.List<MediaType>	getSupportedMediaTypes() Return the list of media types this View supports, or an empty list.
private boolean	isMatch(java.util.Map.Entry<java.lang.String,?> entry)
<any>	render(java.util.Map<java.lang.String,?> model, MediaType contentType, ServerWebExchange exchange) Render the view based on the given HandlerResult.
void	setModelKeys(java.util.Set<java.lang.String> modelKeys) Set the attributes in the model that should be rendered by this view.
private <T> <any>	write(T value, MediaType contentType, ServerWebExchange exchange)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.web.reactive.result.view.View

isRedirectView

Field Detail

writer

private final HttpMessageWriter<?> writer

modelKeys

private final java.util.Set<java.lang.String> modelKeys

canWriteMap

private final boolean canWriteMap

Constructor Detail

HttpMessageWriterView

public HttpMessageWriterView(Encoder<?> encoder)

Constructor with an Encoder.

HttpMessageWriterView

public HttpMessageWriterView(HttpMessageWriter<?> writer)

Constructor with a fully initialized HttpMessageWriter.

Method Detail

getMessageWriter

public HttpMessageWriter<?> getMessageWriter()

Return the configured message writer.

getSupportedMediaTypes

public java.util.List<MediaType> getSupportedMediaTypes()

Return the list of media types this View supports, or an empty list.

The implementation of this method for HttpMessageWriterView delegates to HttpMessageWriter.getWritableMediaTypes().

Specified by:

getSupportedMediaTypes in interface View

setModelKeys

public void setModelKeys(@Nullable
                         java.util.Set<java.lang.String> modelKeys)

Set the attributes in the model that should be rendered by this view. When set, all other model attributes will be ignored. The matching attributes are further narrowed with HttpMessageWriter.canWrite(org.springframework.core.ResolvableType, org.springframework.http.MediaType). The matching attributes are processed as follows:

• 0: nothing is written to the response body.
• 1: the matching attribute is passed to the writer.
• 2..N: if the writer supports Map, write all matches; otherwise raise an IllegalStateException.

getModelKeys

public final java.util.Set<java.lang.String> getModelKeys()

Return the configured model keys.

render

public <any> render(@Nullable
                    java.util.Map<java.lang.String,?> model,
                    @Nullable
                    MediaType contentType,
                    ServerWebExchange exchange)

Description copied from interface: View

Render the view based on the given HandlerResult. Implementations can access and use the model or only a specific attribute in it.

Specified by:

render in interface View

Parameters:

model - Map with name Strings as keys and corresponding model objects as values (Map can also be null in case of empty model)

contentType - the content type selected to render with which should match one of the supported media types.

exchange - the current exchange

Returns:

Mono to represent when and if rendering succeeds

getObjectToRender

@Nullable
private java.lang.Object getObjectToRender(@Nullable
                                                     java.util.Map<java.lang.String,?> model)

isMatch

private boolean isMatch(java.util.Map.Entry<java.lang.String,?> entry)

write

private <T> <any> write(T value,
                        @Nullable
                        MediaType contentType,
                        ServerWebExchange exchange)