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• WriterInterceptorContext.java

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2011-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
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 * elects to include this software in this distribution under the [CDDL or GPL
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 * recipient has the option to distribute your version of this file under
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 */
package javax.ws.rs.ext;

import java.io.IOException;
import java.io.OutputStream;

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

/**
 * Context class used by {@link javax.ws.rs.ext.WriterInterceptor}
 * to intercept calls to {@link javax.ws.rs.ext.MessageBodyWriter#writeTo}.
 * The getters and setters in this context class correspond to the
 * parameters of the intercepted method.
 *
 * @author Santiago Pericas-Geertsen
 * @author Bill Burke
 * @see WriterInterceptor
 * @see MessageBodyWriter
 * @since 2.0
 */
public interface WriterInterceptorContext extends InterceptorContext {

    /**
     * Proceed to the next interceptor in the chain.
     *
     * Interceptors MUST explicitly call this method to continue the execution chain;
     * the call to this method in the last interceptor of the chain will invoke
     * the wrapped {@link javax.ws.rs.ext.MessageBodyWriter#writeTo} method.
     *
     * @throws java.io.IOException if an IO error arises or is thrown by the wrapped
     *                             {@code MessageBodyWriter.writeTo} method.
     * @throws javax.ws.rs.WebApplicationException
     *                             thrown by the wrapped {@code MessageBodyWriter.writeTo} method.
     */
    void proceed() throws IOException, WebApplicationException;

    /**
     * Get object to be written as HTTP entity.
     *
     * @return object to be written as HTTP entity.
     */
    Object getEntity();

    /**
     * Update object to be written as HTTP entity.
     *
     * @param entity new object to be written.
     */
    void setEntity(Object entity);

    /**
     * Get the output stream for the object to be written. The JAX-RS runtime
     * is responsible for closing the output stream.
     *
     * @return output stream for the object to be written.
     */
    OutputStream getOutputStream();

    /**
     * Set a new output stream for the object to be written. For example, by wrapping
     * it with another output stream. The JAX-RS runtime is responsible for closing
     * the output stream that is set.
     *
     * @param os new output stream for the object to be written.
     */
    public void setOutputStream(OutputStream os);

    /**
     * Get mutable map of HTTP headers.
     *
     * @return map of HTTP headers.
     */
    MultivaluedMap getHeaders();
}