    001// Copyright 2007, 2008 The Apache Software Foundation
    002//
    003// Licensed under the Apache License, Version 2.0 (the "License");
    004// you may not use this file except in compliance with the License.
    005// You may obtain a copy of the License at
    006//
    007//     http://www.apache.org/licenses/LICENSE-2.0
    008//
    009// Unless required by applicable law or agreed to in writing, software
    010// distributed under the License is distributed on an "AS IS" BASIS,
    011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012// See the License for the specific language governing permissions and
    013// limitations under the License.
    014
    015package org.apache.tapestry5;
    016
    017import org.apache.tapestry5.services.Response;
    018
    019import java.io.BufferedInputStream;
    020import java.io.IOException;
    021import java.io.InputStream;
    022
    023/**
    024 * An alternate response from a component event handler method used to directly provide a stream of data to be sent to
    025 * the client, rather than indicating what page to send a render redirect request to.
    026 */
    027public interface StreamResponse
    028{
    029    /**
    030     * Returns the content type to be reported to the client.
    031     */
    032    String getContentType();
    033
    034    /**
    035     * Returns the stream of bytes to be sent to the client. The stream will be closed when the end of the stream is
    036     * reached. The provided stream will be wrapped in a {@link BufferedInputStream} for efficiency.
    037     */
    038    InputStream getStream() throws IOException;
    039
    040
    041    /**
    042     * Prepares the response before it is sent to the client. This is the place to set any response headers (e.g.
    043     * content-disposition).
    044     *
    045     * @param response Response that will be sent.
    046     */
    047    void prepareResponse(Response response);
    048
    049}