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/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the "License"). You may not use this file except
* in compliance with the License.
*
* You can obtain a copy of the license at
* http://www.opensource.org/licenses/cddl1.php
* See the License for the specific language governing
* permissions and limitations under the License.
*/
/*
* MessageBodyWriter.java
*
* Created on November 8, 2007, 3:57 PM
*
*/
package javax.ws.rs.ext;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.ws.rs.WebApplicationException;
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. To add a <code>MessageBodyWriter</code> implementation, annotate the
* implementation class with <code>@Provider</code>.
*
* A <code>MessageBodyWriter</code> implementation may be annotated
* with {@link javax.ws.rs.Produces} to restrict the media types for which it will
* be considered suitable.
*
* @param T the type that can be written
* @see Provider
* @see javax.ws.rs.Produces
*/
public interface MessageBodyWriter<T> {
/**
* Ascertain if the MessageBodyWriter supports a particular type.
*
* @param type the class of object that is to be written.
* @param genericType the type of object 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 on the resource
* method that returns the object.
* @param mediaType the media type of the HTTP entity.
* @return true if the type is supported, otherwise false.
*/
boolean isWriteable(Class<?> type, Type genericType,
Annotation annotations[], MediaType mediaType);
/**
* Called before <code>writeTo</code> to ascertain the length in bytes of
* the serialized form of <code>t</code>. A non-negative return value is
* used in a HTTP <code>Content-Length</code> header.
* @param t the instance to write
* @param type the class of object that is to be written.
* @param genericType the type of object to be written, obtained either
* by reflection of a resource method return type or by 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 on the resource
* method that returns the object.
* @param mediaType the media type of the HTTP entity.
* @return length in bytes or -1 if the length cannot be determined in
* advance
*/
long getSize(T t, Class<?> type, Type genericType, Annotation annotations[],
MediaType mediaType);
/**
* Write a type to an HTTP response. The response 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 response body.
*
* @param t the instance to write.
* @param type the class of object that is to be written.
* @param genericType the type of object to be written, obtained either
* by reflection of a resource method return type or by 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 on the resource
* method that returns the object.
* @param mediaType the media type of the HTTP entity.
* @param httpHeaders a mutable map of the HTTP response 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 response being committed.
*/
void writeTo(T t, Class<?> type, Type genericType, Annotation annotations[],
MediaType mediaType,
MultivaluedMap<String, Object> httpHeaders,
OutputStream entityStream) throws IOException, WebApplicationException;
}
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