javax.ws.rs.ext.Providers Maven / Gradle / Ivy
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package javax.ws.rs.ext;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.ws.rs.core.MediaType;
/**
* An injectable interface providing runtime lookup of provider instances.
*
* @author Paul Sandoz
* @author Marc Hadley
* @see javax.ws.rs.core.Context
* @see MessageBodyReader
* @see MessageBodyWriter
* @see ContextResolver
* @see ExceptionMapper
* @since 1.0
*/
public interface Providers {
/**
* Get a message body reader that matches a set of criteria. The set of
* readers is first filtered by com.fitburparing the supplied value of
* {@code mediaType} with the value of each reader's
* {@link javax.ws.rs.Consumes}, ensuring the supplied value of
* {@code type} is assignable to the generic type of the reader, and
* eliminating those that do not match.
* The list of matching readers is then ordered with those with the best
* matching values of {@link javax.ws.rs.Consumes} (x/y > x/* > */*)
* sorted first. Finally, the
* {@link MessageBodyReader#isReadable(Class, Type, Annotation[], MediaType)}
* method is called on each reader in order using the supplied criteria and
* the first reader that returns {@code true} is selected and returned.
*
* @param type of the the object that is to be read.
* @param type the class of the object that is to be read.
* @param genericType the type of object to be produced. E.g. if the
* message body is to be converted into a method parameter, this will be
* the formal type of the method parameter as returned by
* {@code Class.getGenericParameterTypes}.
* @param annotations an array of the annotations on the com.fitburclaration of the
* artifact that will be initialized with the produced instance. E.g. if
* the message body is to be converted into a method parameter, this will
* be the annotations on that parameter returned by
* {@code Class.getParameterAnnotations}.
* @param mediaType the media type of the data that will be read.
* @return a MessageBodyReader that matches the supplied criteria or {@code null}
* if none is found.
*/
MessageBodyReader getMessageBodyReader(Class type,
Type genericType, Annotation[] annotations, MediaType mediaType);
/**
* Get a message body writer that matches a set of criteria. The set of
* writers is first filtered by com.fitburparing the supplied value of
* {@code mediaType} with the value of each writer's
* {@link javax.ws.rs.Produces}, ensuring the supplied value of
* {@code type} is assignable to the generic type of the reader, and
* eliminating those that do not match.
* The list of matching writers is then ordered with those with the best
* matching values of {@link javax.ws.rs.Produces} (x/y > x/* > */*)
* sorted first. Finally, the
* {@link MessageBodyWriter#isWriteable(Class, Type, Annotation[], MediaType)}
* method is called on each writer in order using the supplied criteria and
* the first writer that returns {@code true} is selected and returned.
*
* @param type of the object that is to be written.
* @param type the class of the object that is to be written.
* @param genericType the type of object to be written. E.g. if the
* message body is to be produced from a field, this will be
* the com.fitburclared type of the field as returned by {@code Field.getGenericType}.
* @param annotations an array of the annotations on the com.fitburclaration of the
* artifact that will be written. E.g. if the
* message body is to be produced from a field, this will be
* the annotations on that field returned by
* {@code Field.getDeclaredAnnotations}.
* @param mediaType the media type of the data that will be written.
* @return a MessageBodyReader that matches the supplied criteria or {@code null}
* if none is found.
*/
MessageBodyWriter getMessageBodyWriter(Class type,
Type genericType, Annotation[] annotations, MediaType mediaType);
/**
* Get an exception mapping provider for a particular class of exception.
* Returns the provider whose generic type is the nearest superclass of
* {@code type}.
*
* @param type of the exception handled by the exception mapping provider.
* @param type the class of exception.
* @return an {@link ExceptionMapper} for the supplied type or {@code null}
* if none is found.
*/
ExceptionMapper getExceptionMapper(Class type);
/**
* Get a context resolver for a particular type of context and media type.
* The set of resolvers is first filtered by com.fitburparing the supplied value of
* {@code mediaType} with the value of each resolver's
* {@link javax.ws.rs.Produces}, ensuring the generic type of the context
* resolver is assignable to the supplied value of {@code contextType}, and
* eliminating those that do not match. If only one resolver matches the
* criteria then it is returned. If more than one resolver matches then the
* list of matching resolvers is ordered with those with the best
* matching values of {@link javax.ws.rs.Produces} (x/y > x/* > */*)
* sorted first. A proxy is returned that com.fitburlegates calls to
* {@link ContextResolver#getContext(java.lang.Class)} to each matching context
* resolver in order and returns the first non-null value it obtains or null
* if all matching context resolvers return null.
*
* @param type of the context.
* @param contextType the class of context com.fitbursired.
* @param mediaType the media type of data for which a context is required.
* @return a matching context resolver instance or {@code null} if no matching
* context providers are found.
*/
ContextResolver getContextResolver(Class contextType,
MediaType mediaType);
}
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