Spring Messaging 6.1.4 · org.springframework.messaging.converter.AbstractMessageConverter

Modifier and Type	Field and Description
private ContentTypeResolver	contentTypeResolver
protected final Log	logger
private Class<?>	serializedPayloadClass
private boolean	strictContentTypeMatch
private final List<MimeType>	supportedMimeTypes

Access	Constructor and Description
protected	AbstractMessageConverter(MimeType supportedMimeType) Constructor with a single MIME type.
protected	AbstractMessageConverter(MimeType... supportedMimeTypes) Constructor with multiple MIME types.
protected	AbstractMessageConverter(Collection<MimeType> supportedMimeTypes) Constructor with Collection of MIME types.

Method Summary

Modifier and Type	Method and Description
protected void	addSupportedMimeTypes(MimeType... supportedMimeTypes) Allows subclasses to add more supported mime types.
protected boolean	canConvertFrom(Message<?> message, Class<?> targetClass)
protected boolean	canConvertTo(Object payload, MessageHeaders headers)
protected Object	Returns: the result of the conversion, or `null` if the converter cannot perform the conversion convertFromInternal(Message<?> the input message message, Class<?> the target class for the conversion targetClass, Object an extra object passed to the `MessageConverter`, e.g. the associated `MethodParameter` (may be `null`} conversionHint) Convert the message payload from serialized form to an Object.
protected Object	Returns: the resulting payload for the message, or `null` if the converter cannot perform the conversion convertToInternal(Object the Object to convert payload, MessageHeaders optional headers for the message (may be `null`) headers, Object an extra object passed to the `MessageConverter`, e.g. the associated `MethodParameter` (may be `null`} conversionHint) Convert the payload object to serialized form.
public final Object	fromMessage(Message<?> the input message message, Class<?> the target class for the conversion targetClass) Implements org.springframework.messaging.converter.MessageConverter.fromMessage. Convert the payload of a `Message` from a serialized form to a typed Object of the specified target class.
public final Object	fromMessage(Message<?> the input message message, Class<?> the target class for the conversion targetClass, Object an extra object passed to the `MessageConverter`, e.g. the associated `MethodParameter` (may be `null`} conversionHint) Implements org.springframework.messaging.converter.SmartMessageConverter.fromMessage. A variant of `fromMessage(Message, Class)` which takes an extra conversion context as an argument, allowing to take e.g. annotations on a payload parameter into account.
public ContentTypeResolver	getContentTypeResolver() Return the `configured` `ContentTypeResolver`.
protected MimeType	Returns: the content type, or `null` if not known getDefaultContentType(Object the payload being converted to a message payload) Return the default content type for the payload.
protected MimeType	getMimeType(MessageHeaders headers)
pack-priv static Type	getResolvedType(Class<?> targetClass, Object conversionHint)
public Class<?>	getSerializedPayloadClass() Return the configured preferred serialization payload class.
public List<MimeType>	getSupportedMimeTypes() Return the supported MIME types.
public boolean	isStrictContentTypeMatch() Whether content type resolution must produce a value that matches one of the supported MIME types.
public void	setContentTypeResolver(ContentTypeResolver resolver) Configure a `ContentTypeResolver` for resolving the content type of input messages.
public void	setSerializedPayloadClass(Class<?> either byte[] or String payloadClass) Configure the preferred serialization class to use (byte[] or String) when converting an Object payload to a `Message`.
public void	setStrictContentTypeMatch(boolean strictContentTypeMatch) Whether this converter should convert messages for which no content type can be resolved through the configured `org.springframework.messaging.converter.ContentTypeResolver`.
protected abstract boolean	Returns: `true` if supported; `false` otherwise supports(Class<?> the class to test for support clazz) Whether the given class is supported by this converter.
protected boolean	supportsMimeType(MessageHeaders headers)
public final Message<?>	toMessage(Object the Object to convert payload, MessageHeaders optional headers for the message (may be `null`) headers) Implements org.springframework.messaging.converter.MessageConverter.toMessage. Create a `Message` whose payload is the result of converting the given payload Object to serialized form.
public final Message<?>	toMessage(Object the Object to convert payload, MessageHeaders optional headers for the message (may be `null`) headers, Object an extra object passed to the `MessageConverter`, e.g. the associated `MethodParameter` (may be `null`} conversionHint) Implements org.springframework.messaging.converter.SmartMessageConverter.toMessage. A variant of `toMessage(Object, MessageHeaders)` which takes an extra conversion context as an argument, allowing to take e.g. annotations on a return type into account.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll toString wait wait wait

contentTypeResolver	back to summary
private ContentTypeResolver contentTypeResolver Annotations @Nullable

logger	back to summary
protected final Log logger

serializedPayloadClass	back to summary
private Class<?> serializedPayloadClass

strictContentTypeMatch	back to summary
private boolean strictContentTypeMatch

supportedMimeTypes	back to summary
private final List<MimeType> supportedMimeTypes

AbstractMessageConverter	back to summary
protected AbstractMessageConverter(MimeType supportedMimeType) Constructor with a single MIME type.

AbstractMessageConverter	back to summary
protected AbstractMessageConverter(MimeType... supportedMimeTypes) Constructor with multiple MIME types. Since 5.2.2

AbstractMessageConverter	back to summary
protected AbstractMessageConverter(Collection<MimeType> supportedMimeTypes) Constructor with Collection of MIME types.

Method Detail

addSupportedMimeTypes	back to summary
protected void addSupportedMimeTypes(MimeType... supportedMimeTypes) Allows subclasses to add more supported mime types. Since 5.2.2

addSupportedMimeTypes

back to summary

protected void addSupportedMimeTypes(MimeType... supportedMimeTypes)

Allows subclasses to add more supported mime types.

Since: 5.2.2

canConvertFrom	back to summary
protected boolean canConvertFrom(Message<?> message, Class<?> targetClass)

canConvertTo	back to summary
protected boolean canConvertTo(Object payload, MessageHeaders headers)

convertFromInternal back to summary

convertFromInternal	back to summary
protected Object convertFromInternal(Message<?> message, Class<?> targetClass, Object conversionHint) Convert the message payload from serialized form to an Object. Parameters message:Message<?> the input message targetClass:Class<?> the target class for the conversion conversionHint:Object an extra object passed to the `MessageConverter`, e.g. the associated `MethodParameter` (may be `null`} Returns:Object the result of the conversion, or `null` if the converter cannot perform the conversion Annotations @Nullable Since 4.2

protected Object convertFromInternal(Message<?> message, Class<?> targetClass, Object conversionHint)

Convert the message payload from serialized form to an Object.

Parameters

message:Message<?>: the input message
targetClass:Class<?>: the target class for the conversion
conversionHint:Object: an extra object passed to the MessageConverter, e.g. the associated MethodParameter (may be null}

Returns:Object

the result of the conversion, or null if the converter cannot perform the conversion

Annotations

@Nullable

Since

4.2

convertToInternal back to summary

convertToInternal	back to summary
protected Object convertToInternal(Object payload, MessageHeaders headers, Object conversionHint) Convert the payload object to serialized form. Parameters payload:Object the Object to convert headers:MessageHeaders optional headers for the message (may be `null`) conversionHint:Object an extra object passed to the `MessageConverter`, e.g. the associated `MethodParameter` (may be `null`} Returns:Object the resulting payload for the message, or `null` if the converter cannot perform the conversion Annotations @Nullable Since 4.2

protected Object convertToInternal(Object payload, MessageHeaders headers, Object conversionHint)

Convert the payload object to serialized form.

Parameters

payload:Object: the Object to convert
headers:MessageHeaders: optional headers for the message (may be null)
conversionHint:Object: an extra object passed to the MessageConverter, e.g. the associated MethodParameter (may be null}

Returns:Object

the resulting payload for the message, or null if the converter cannot perform the conversion

Annotations

@Nullable

Since

4.2

fromMessage back to summary

fromMessage	back to summary
public final Object fromMessage(Message<?> message, Class<?> targetClass) Implements org.springframework.messaging.converter.MessageConverter.fromMessage. Doc from org.springframework.messaging.converter.MessageConverter.fromMessage. Convert the payload of a `Message` from a serialized form to a typed Object of the specified target class. The `MessageHeaders#CONTENT_TYPE` header should indicate the MIME type to convert from. If the converter does not support the specified media type or cannot perform the conversion, it should return `null`. Parameters message:Message<?> the input message targetClass:Class<?> the target class for the conversion Returns:Object the result of the conversion, or `null` if the converter cannot perform the conversion Annotations @Override @Nullable

public final Object fromMessage(Message<?> message, Class<?> targetClass)

Implements org.springframework.messaging.converter.MessageConverter.fromMessage.

Doc from org.springframework.messaging.converter.MessageConverter.fromMessage.

Convert the payload of a Message from a serialized form to a typed Object of the specified target class. The MessageHeaders#CONTENT_TYPE header should indicate the MIME type to convert from.

If the converter does not support the specified media type or cannot perform the conversion, it should return null.

Parameters

message:Message<?>: the input message
targetClass:Class<?>: the target class for the conversion

Returns:Object

the result of the conversion, or null if the converter cannot perform the conversion

Annotations

@Override
@Nullable

fromMessage back to summary

fromMessage	back to summary
public final Object fromMessage(Message<?> message, Class<?> targetClass, Object conversionHint) Implements org.springframework.messaging.converter.SmartMessageConverter.fromMessage. Doc from org.springframework.messaging.converter.SmartMessageConverter.fromMessage. A variant of `fromMessage(Message, Class)` which takes an extra conversion context as an argument, allowing to take e.g. annotations on a payload parameter into account. Parameters message:Message<?> the input message targetClass:Class<?> the target class for the conversion conversionHint:Object an extra object passed to the `MessageConverter`, e.g. the associated `MethodParameter` (may be `null`} Returns:Object the result of the conversion, or `null` if the converter cannot perform the conversion Annotations @Override @Nullable

public final Object fromMessage(Message<?> message, Class<?> targetClass, Object conversionHint)

Implements org.springframework.messaging.converter.SmartMessageConverter.fromMessage.

Doc from org.springframework.messaging.converter.SmartMessageConverter.fromMessage.

A variant of fromMessage(Message, Class) which takes an extra conversion context as an argument, allowing to take e.g. annotations on a payload parameter into account.

Parameters

message:Message<?>: the input message
targetClass:Class<?>: the target class for the conversion
conversionHint:Object: an extra object passed to the MessageConverter, e.g. the associated MethodParameter (may be null}

Returns:Object

the result of the conversion, or null if the converter cannot perform the conversion

Annotations

@Override
@Nullable

getContentTypeResolver back to summary

getContentTypeResolver	back to summary
public ContentTypeResolver getContentTypeResolver() Return the `configured` `ContentTypeResolver`. Annotations @Nullable

public ContentTypeResolver getContentTypeResolver()

Return the configured ContentTypeResolver.

Annotations

@Nullable

getDefaultContentType back to summary

getDefaultContentType	back to summary
protected MimeType getDefaultContentType(Object payload) Return the default content type for the payload. Called when `toMessage(Object, MessageHeaders)` is invoked without message headers or without a content type header. By default, this returns the first element of the `supportedMimeTypes`, if any. Can be overridden in subclasses. Parameters payload:Object the payload being converted to a message Returns:MimeType the content type, or `null` if not known Annotations @Nullable

protected MimeType getDefaultContentType(Object payload)

Return the default content type for the payload. Called when toMessage(Object, MessageHeaders) is invoked without message headers or without a content type header.

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

Parameters

payload:Object: the payload being converted to a message

Returns:MimeType

the content type, or null if not known

Annotations

@Nullable

getMimeType	back to summary
protected MimeType getMimeType(MessageHeaders headers) Annotations @Nullable

getResolvedType	back to summary
pack-priv static Type getResolvedType(Class<?> targetClass, Object conversionHint)

getSerializedPayloadClass	back to summary
public Class<?> getSerializedPayloadClass() Return the configured preferred serialization payload class.

getSupportedMimeTypes	back to summary
public List<MimeType> getSupportedMimeTypes() Return the supported MIME types.

isStrictContentTypeMatch	back to summary
public boolean isStrictContentTypeMatch() Whether content type resolution must produce a value that matches one of the supported MIME types.

setContentTypeResolver back to summary

setContentTypeResolver	back to summary
public void setContentTypeResolver(ContentTypeResolver resolver) Configure a `ContentTypeResolver` for resolving the content type of input messages. By default, a `DefaultContentTypeResolver` instance is used. Note if the resolver is set to `null`, then `strictContentTypeMatch` should be `false`, which is the default, or otherwise this converter will ignore all messages.

public void setContentTypeResolver(ContentTypeResolver resolver)

Configure a ContentTypeResolver for resolving the content type of input messages.

By default, a DefaultContentTypeResolver instance is used.

Note

if the resolver is set to null, then strictContentTypeMatch should be false, which is the default, or otherwise this converter will ignore all messages.

setSerializedPayloadClass back to summary

setSerializedPayloadClass	back to summary
public void setSerializedPayloadClass(Class<?> payloadClass) Configure the preferred serialization class to use (byte[] or String) when converting an Object payload to a `Message`. The default value is byte[]. Parameters payloadClass:Class<?> either byte[] or String

public void setSerializedPayloadClass(Class<?> payloadClass)

Configure the preferred serialization class to use (byte[] or String) when converting an Object payload to a Message.

The default value is byte[].

Parameters

payloadClass:Class<?>: either byte[] or String

setStrictContentTypeMatch back to summary

setStrictContentTypeMatch	back to summary
public void setStrictContentTypeMatch(boolean strictContentTypeMatch) Whether this converter should convert messages for which no content type can be resolved through the configured `org.springframework.messaging.converter.ContentTypeResolver`. A converter can be configured to be strict only when a `contentTypeResolver` is configured and the list of `supportedMimeTypes` is not empty. When this flag is set to `true`, `supportsMimeType(MessageHeaders)` will return `false` if the `contentTypeResolver` is not defined or if no content-type header is present.

public void setStrictContentTypeMatch(boolean strictContentTypeMatch)

Whether this converter should convert messages for which no content type can be resolved through the configured org.springframework.messaging.converter.ContentTypeResolver.

A converter can be configured to be strict only when a contentTypeResolver is configured and the list of supportedMimeTypes is not empty.

When this flag is set to true, supportsMimeType(MessageHeaders) will return false if the contentTypeResolver is not defined or if no content-type header is present.

supports back to summary

supports	back to summary
protected abstract boolean supports(Class<?> clazz) Whether the given class is supported by this converter. Parameters clazz:Class<?> the class to test for support Returns:boolean `true` if supported; `false` otherwise

protected abstract boolean supports(Class<?> clazz)

Whether the given class is supported by this converter.

Parameters

clazz:Class<?>: the class to test for support

Returns:boolean

true if supported; false otherwise

supportsMimeType	back to summary
protected boolean supportsMimeType(MessageHeaders headers)

toMessage back to summary

toMessage	back to summary
public final Message<?> toMessage(Object payload, MessageHeaders headers) Implements org.springframework.messaging.converter.MessageConverter.toMessage. Doc from org.springframework.messaging.converter.MessageConverter.toMessage. Create a `Message` whose payload is the result of converting the given payload Object to serialized form. The optional `MessageHeaders` parameter may contain a `MessageHeaders#CONTENT_TYPE` header to specify the target media type for the conversion and it may contain additional headers to be added to the message. If the converter does not support the specified media type or cannot perform the conversion, it should return `null`. Parameters payload:Object the Object to convert headers:MessageHeaders optional headers for the message (may be `null`) Returns:Message<?> the new message, or `null` if the converter does not support the Object type or the target media type Annotations @Override @Nullable

public final Message<?> toMessage(Object payload, MessageHeaders headers)

Implements org.springframework.messaging.converter.MessageConverter.toMessage.

Doc from org.springframework.messaging.converter.MessageConverter.toMessage.

Create a Message whose payload is the result of converting the given payload Object to serialized form. The optional MessageHeaders parameter may contain a MessageHeaders#CONTENT_TYPE header to specify the target media type for the conversion and it may contain additional headers to be added to the message.

If the converter does not support the specified media type or cannot perform the conversion, it should return null.

Parameters

payload:Object: the Object to convert
headers:MessageHeaders: optional headers for the message (may be null)

Returns:Message<?>

the new message, or null if the converter does not support the Object type or the target media type

Annotations

@Override
@Nullable

toMessage back to summary

toMessage	back to summary
public final Message<?> toMessage(Object payload, MessageHeaders headers, Object conversionHint) Implements org.springframework.messaging.converter.SmartMessageConverter.toMessage. Doc from org.springframework.messaging.converter.SmartMessageConverter.toMessage. A variant of `toMessage(Object, MessageHeaders)` which takes an extra conversion context as an argument, allowing to take e.g. annotations on a return type into account. Parameters payload:Object the Object to convert headers:MessageHeaders optional headers for the message (may be `null`) conversionHint:Object an extra object passed to the `MessageConverter`, e.g. the associated `MethodParameter` (may be `null`} Returns:Message<?> the new message, or `null` if the converter does not support the Object type or the target media type Annotations @Override @Nullable

public final Message<?> toMessage(Object payload, MessageHeaders headers, Object conversionHint)

Implements org.springframework.messaging.converter.SmartMessageConverter.toMessage.

Doc from org.springframework.messaging.converter.SmartMessageConverter.toMessage.

A variant of toMessage(Object, MessageHeaders) which takes an extra conversion context as an argument, allowing to take e.g. annotations on a return type into account.

Parameters

payload:Object: the Object to convert
headers:MessageHeaders: optional headers for the message (may be null)
conversionHint:Object: an extra object passed to the MessageConverter, e.g. the associated MethodParameter (may be null}

Returns:Message<?>

the new message, or null if the converter does not support the Object type or the target media type

Annotations

@Override
@Nullable

public abstract Class AbstractMessageConverter

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