org.springframework.http.converter

Class ResourceHttpMessageConverter

java.lang.Object

org.springframework.http.converter.AbstractHttpMessageConverter<Resource>

org.springframework.http.converter.ResourceHttpMessageConverter

All Implemented Interfaces:

HttpMessageConverter<Resource>

public class ResourceHttpMessageConverter
extends AbstractHttpMessageConverter<Resource>

Implementation of HttpMessageConverter that can read and write Resources.

By default, this converter can read all media types. The Java Activation Framework (JAF) - if available - is used to determine the Content-Type of written resources. If JAF is not available, application/octet-stream is used.

Since:

3.0.2

Author:

Arjen Poutsma

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	ResourceHttpMessageConverter.ActivationMediaTypeFactory Inner class to avoid a hard-coded JAF dependency.

Field Summary

Fields

Modifier and Type	Field and Description
private static boolean	jafPresent

Fields inherited from class org.springframework.http.converter.AbstractHttpMessageConverter

logger

Constructor Summary

Constructors

Constructor and Description
ResourceHttpMessageConverter()

Method Summary

Modifier and Type	Method and Description
protected java.lang.Long	getContentLength(Resource resource, MediaType contentType) Returns the content length for the given type.
protected MediaType	getDefaultContentType(Resource resource) Returns the default content type for the given type.
protected Resource	readInternal(java.lang.Class<? extends Resource> clazz, HttpInputMessage inputMessage) Abstract template method that reads the actual object.
protected boolean	supports(java.lang.Class<?> clazz) Indicates whether the given class is supported by this converter.
protected void	writeInternal(Resource resource, HttpOutputMessage outputMessage) Abstract template method that writes the actual body.

Methods inherited from class org.springframework.http.converter.AbstractHttpMessageConverter

addDefaultHeaders, canRead, canRead, canWrite, canWrite, getSupportedMediaTypes, read, setSupportedMediaTypes, write

Methods inherited from class java.lang.Object

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

Field Detail

jafPresent

private static final boolean jafPresent

Constructor Detail

ResourceHttpMessageConverter

public ResourceHttpMessageConverter()

Method Detail

supports

protected boolean supports(java.lang.Class<?> clazz)

Description copied from class: AbstractHttpMessageConverter

Indicates whether the given class is supported by this converter.

Specified by:

supports in class AbstractHttpMessageConverter<Resource>

Parameters:

clazz - the class to test for support

Returns:

true if supported; false otherwise

readInternal

protected Resource readInternal(java.lang.Class<? extends Resource> clazz,
                                HttpInputMessage inputMessage)
                         throws java.io.IOException,
                                HttpMessageNotReadableException

Description copied from class: AbstractHttpMessageConverter

Abstract template method that reads the actual object. Invoked from AbstractHttpMessageConverter.read(java.lang.Class<? extends T>, org.springframework.http.HttpInputMessage).

Specified by:

readInternal in class AbstractHttpMessageConverter<Resource>

Parameters:

clazz - the type of object to return

inputMessage - the HTTP input message to read from

Returns:

the converted object

Throws:

java.io.IOException - in case of I/O errors

HttpMessageNotReadableException - in case of conversion errors

getDefaultContentType

protected MediaType getDefaultContentType(Resource resource)

Description copied from class: AbstractHttpMessageConverter

Returns the default content type for the given type. Called when AbstractHttpMessageConverter.write(T, org.springframework.http.MediaType, org.springframework.http.HttpOutputMessage) is invoked without a specified content type parameter.

By default, this returns the first element of the supportedMediaTypes property, if any. Can be overridden in subclasses.

Overrides:

getDefaultContentType in class AbstractHttpMessageConverter<Resource>

Parameters:

resource - the type to return the content type for

Returns:

the content type, or null if not known

getContentLength

protected java.lang.Long getContentLength(Resource resource,
                                          MediaType contentType)
                                   throws java.io.IOException

Description copied from class: AbstractHttpMessageConverter

Returns the content length for the given type.

By default, this returns null, meaning that the content length is unknown. Can be overridden in subclasses.

Overrides:

getContentLength in class AbstractHttpMessageConverter<Resource>

Parameters:

resource - the type to return the content length for

Returns:

the content length, or null if not known

Throws:

java.io.IOException

writeInternal

protected void writeInternal(Resource resource,
                             HttpOutputMessage outputMessage)
                      throws java.io.IOException,
                             HttpMessageNotWritableException

Description copied from class: AbstractHttpMessageConverter

Abstract template method that writes the actual body. Invoked from AbstractHttpMessageConverter.write(T, org.springframework.http.MediaType, org.springframework.http.HttpOutputMessage).

Specified by:

writeInternal in class AbstractHttpMessageConverter<Resource>

Parameters:

resource - the object to write to the output message

outputMessage - the HTTP output message to write to

Throws:

java.io.IOException - in case of I/O errors

HttpMessageNotWritableException - in case of conversion errors