response.java

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/*
 * $Header: /home/cvs/jakarta-tomcat-catalina/catalina/src/share/org/apache/catalina/Response.java,v 1.3 2004/01/20 19:38:38 luehe Exp $
 * $Revision: 1.3 $
 * $Date: 2004/01/20 19:38:38 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */


package org.apache.catalina;


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

import javax.servlet.ServletOutputStream;
import javax.servlet.ServletResponse;


/**
 * A <b>Response</b> is the Catalina-internal facade for a
 * <code>ServletResponse</code> that is to be produced,
 * based on the processing of a corresponding <code>Request</code>.
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.3 $ $Date: 2004/01/20 19:38:38 $
 */

public interface Response {


    // ------------------------------------------------------------- Properties


    /**
     * Return the Connector through which this Response is returned.
     */
    public Connector getConnector();


    /**
     * Set the Connector through which this Response is returned.
     *
     * @param connector The new connector
     */
    public void setConnector(Connector connector);


    /**
     * Return the number of bytes actually written to the output stream.
     */
    public int getContentCount();


    /**
     * Return the Context with which this Response is associated.
     */
    public Context getContext();


    /**
     * Set the Context with which this Response is associated.  This should
     * be called as soon as the appropriate Context is identified.
     *
     * @param context The associated Context
     */
    public void setContext(Context context);


    /**
     * Set the application commit flag.
     * 
     * @param appCommitted The new application committed flag value
     */
    public void setAppCommitted(boolean appCommitted);


    /**
     * Application commit flag accessor.
     */
    public boolean isAppCommitted();


    /**
     * Return the "processing inside an include" flag.
     */
    public boolean getIncluded();


    /**
     * Set the "processing inside an include" flag.
     *
     * @param included <code>true</code> if we are currently inside a
     *  RequestDispatcher.include(), else <code>false</code>
     */
    public void setIncluded(boolean included);


    /**
     * Return descriptive information about this Response implementation and
     * the corresponding version number, in the format
     * <code>&lt;description&gt;/&lt;version&gt;</code>.
     */
    public String getInfo();


    /**
     * Return the Request with which this Response is associated.
     */
    public Request getRequest();


    /**
     * Set the Request with which this Response is associated.
     *
     * @param request The new associated request
     */
    public void setRequest(Request request);


    /**
     * Return the <code>ServletResponse</code> for which this object
     * is the facade.
     */
    public ServletResponse getResponse();


    /**
     * Return the output stream associated with this Response.
     */
    public OutputStream getStream();


    /**
     * Set the output stream associated with this Response.
     *
     * @param stream The new output stream
     */
    public void setStream(OutputStream stream);


    /**
     * Set the suspended flag.
     * 
     * @param suspended The new suspended flag value
     */
    public void setSuspended(boolean suspended);


    /**
     * Suspended flag accessor.
     */
    public boolean isSuspended();


    /**
     * Set the error flag.
     */
    public void setError();


    /**
     * Error flag accessor.
     */
    public boolean isError();


    // --------------------------------------------------------- Public Methods


    /**
     * Create and return a ServletOutputStream to write the content
     * associated with this Response.
     *
     * @exception IOException if an input/output error occurs
     */
    public ServletOutputStream createOutputStream() throws IOException;


    /**
     * Perform whatever actions are required to flush and close the output
     * stream or writer, in a single operation.
     *
     * @exception IOException if an input/output error occurs
     */
    public void finishResponse() throws IOException;


    /**
     * Return the content length that was set or calculated for this Response.
     */
    public int getContentLength();


    /**
     * Return the content type that was set or calculated for this response,
     * or <code>null</code> if no content type was set.
     */
    public String getContentType();


    /**
     * Return a PrintWriter that can be used to render error messages,
     * regardless of whether a stream or writer has already been acquired.
     *
     * @return Writer which can be used for error reports. If the response is
     * not an error report returned using sendError or triggered by an
     * unexpected exception thrown during the servlet processing
     * (and only in that case), null will be returned if the response stream
     * has already been used.
     *
     * @exception IOException if an input/output error occurs
     */
    public PrintWriter getReporter() throws IOException;


    /**
     * Release all object references, and initialize instance variables, in
     * preparation for reuse of this object.
     */
    public void recycle();


    /**
     * Reset the data buffer but not any status or header information.
     */
    public void resetBuffer();


    /**
     * Send an acknowledgment of a request.
     * 
     * @exception IOException if an input/output error occurs
     */
    public void sendAcknowledgement()
        throws IOException;


}