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/*
 * Copyright (c) 2011, 2019 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package jakarta.ws.rs.ext;

import java.io.IOException;
import java.io.InputStream;

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

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

    /**
     * Proceed to the next interceptor in the chain. Return the result of the next interceptor invoked. 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 jakarta.ws.rs.ext.MessageBodyReader#readFrom}.
     *
     * @return result of next interceptor invoked.
     * @throws IOException if an IO error arises or is thrown by the wrapped {@code MessageBodyReader.readFrom} method.
     * @throws jakarta.ws.rs.WebApplicationException thrown by the wrapped {@code MessageBodyReader.readFrom} method.
     */
    public Object proceed() throws IOException, WebApplicationException;

    /**
     * Get the input stream of the object to be read. The JAX-RS runtime is responsible for closing the input stream.
     *
     * @return input stream of the object to be read.
     */
    public InputStream getInputStream();

    /**
     * Set the input stream of the object to be read. For example, by wrapping it with another input stream. The JAX-RS
     * runtime is responsible for closing the input stream that is set.
     *
     * @param is new input stream.
     */
    public void setInputStream(InputStream is);

    /**
     * Get mutable map of HTTP headers.
     * 
     * Note that while the headers are mutable, a {@link ReaderInterceptor reader interceptor} should typically roll-back
     * any header modifications once the call to {@link #proceed() context.proceed()} returns, to avoid externally visible
     * side-effects of the interceptor invocation.
     * 
     *
     * @return map of HTTP headers.
     */
    public MultivaluedMap getHeaders();
}