bufferedresponsewrapper.java

dispalytag的源码

/**
 * Licensed under the Artistic License; you may not use this file
 * except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://displaytag.sourceforge.net/license.html
 *
 * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */
package org.displaytag.filter;

import javax.servlet.http.HttpServletResponse;


/**
 * Buffers the response; will not send anything directly through to the actual response. Note that this blocks the
 * content-type from being set, you must set it manually in the response.
 * @author Fabrizio Giustina
 * @version $Revision: 1081 $ ($Author: fgiust $)
 */
public interface BufferedResponseWrapper extends HttpServletResponse
{

    /**
     * Headers which cause problems during file download.
     */
    String[] FILTERED_HEADERS = new String[]{"cache-control", "expires", "pragma"};

    /**
     * Return <code>true</code> if ServletOutputStream has been requested from Table tag.
     * @return <code>true</code> if ServletOutputStream has been requested
     */
    boolean isOutRequested();

    /**
     * If the app server sets the content-type of the response, it is sticky and you will not be able to change it.
     * Therefore it is intercepted here.
     * @return the ContentType that was most recently set
     */
    String getContentType();

    /**
     * Returns the String representation of the content written to the response.
     * @return the content of the response
     */
    String getContentAsString();

}