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package javax.ws.rs.ext;

import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;

/**
 * Contract for a provider that supports the conversion of a Java type to a
 * stream.
 *
 * A {@code MessageBodyWriter} implementation may be annotated
 * with {@link javax.ws.rs.Produces} to restrict the media types for which it will
 * be considered suitable.
 * 

* Providers implementing {@code MessageBodyWriter} contract must be either programmatically * registered in a JAX-RS runtime or must be annotated with * {@link javax.ws.rs.ext.Provider @Provider} annotation to be automatically discovered * by the JAX-RS runtime during a provider scanning phase. *

* * @param the type that can be written. * @author Paul Sandoz * @author Marc Hadley * @see Provider * @see javax.ws.rs.Produces * @since 1.0 */ public interface MessageBodyWriter { /** * Ascertain if the MessageBodyWriter supports a particular type. * * @param type the class of instance that is to be written. * @param genericType the type of instance to be written, obtained either * by reflection of a resource method return type or via inspection * of the returned instance. {@link javax.ws.rs.core.GenericEntity} * provides a way to specify this information at runtime. * @param annotations an array of the annotations attached to the message entity instance. * @param mediaType the media type of the HTTP entity. * @return {@code true} if the type is supported, otherwise {@code false}. */ public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType); /** * Originally, the method has been called before {@code writeTo} to ascertain the length in bytes of * the serialized form of {@code t}. A non-negative return value has been used in a HTTP * {@code Content-Length} header. *

* As of JAX-RS 2.0, the method has been deprecated and the value returned by the method is ignored * by a JAX-RS runtime. All {@code MessageBodyWriter} implementations are advised to return {@code -1} * from the method. Responsibility to compute the actual {@code Content-Length} header value has been * delegated to JAX-RS runtime. *

* * @param t the instance to write * @param type the class of instance that is to be written. * @param genericType the type of instance to be written. {@link javax.ws.rs.core.GenericEntity} * provides a way to specify this information at runtime. * @param annotations an array of the annotations attached to the message entity instance. * @param mediaType the media type of the HTTP entity. * @return length in bytes or -1 if the length cannot be determined in advance. */ public long getSize(T t, Class type, Type genericType, Annotation[] annotations, MediaType mediaType); /** * Write a type to an HTTP message. The message header map is mutable * but any changes must be made before writing to the output stream since * the headers will be flushed prior to writing the message body. * * @param t the instance to write. * @param type the class of instance that is to be written. * @param genericType the type of instance to be written. {@link javax.ws.rs.core.GenericEntity} * provides a way to specify this information at runtime. * @param annotations an array of the annotations attached to the message entity instance. * @param mediaType the media type of the HTTP entity. * @param httpHeaders a mutable map of the HTTP message headers. * @param entityStream the {@link OutputStream} for the HTTP entity. The * implementation should not close the output stream. * @throws java.io.IOException if an IO error arises. * @throws javax.ws.rs.WebApplicationException * if a specific HTTP error response needs to be produced. * Only effective if thrown prior to the message being committed. */ public void writeTo(T t, Class type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap httpHeaders, OutputStream entityStream) throws java.io.IOException, javax.ws.rs.WebApplicationException; }




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