/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.apache.coyote.http2;

import java.io.IOException;
import java.nio.ByteBuffer;

import org.apache.coyote.Response;
import org.apache.coyote.http11.HttpOutputBuffer;
import org.apache.coyote.http11.OutputFilter;
import org.apache.coyote.http2.Stream.StreamOutputBuffer;

public class Http2OutputBuffer implements HttpOutputBuffer {

    private final Response coyoteResponse;
    private HttpOutputBuffer next;


    
Add a filter at the start of the existing processing chain. Subsequent calls to the HttpOutputBuffer methods of this object will be passed to the filter. If appropriate, the filter will then call the same method on the next HttpOutputBuffer in the chain until the call reaches the StreamOutputBuffer. 
Params:
filter –    The filter to add to the start of the processing chain/**
     * Add a filter at the start of the existing processing chain. Subsequent
     * calls to the {@link HttpOutputBuffer} methods of this object will be
     * passed to the filter. If appropriate, the filter will then call the same
     * method on the next HttpOutputBuffer in the chain until the call reaches
     * the StreamOutputBuffer.
     *
     * @param filter    The filter to add to the start of the processing chain
     */
    public void addFilter(OutputFilter filter) {
        filter.setBuffer(next);
        next = filter;
    }


    public Http2OutputBuffer(Response coyoteResponse, StreamOutputBuffer streamOutputBuffer) {
        this.coyoteResponse = coyoteResponse;
        this.next = streamOutputBuffer;
    }


    @Override
    public int doWrite(ByteBuffer chunk) throws IOException {
        if (!coyoteResponse.isCommitted()) {
            coyoteResponse.sendHeaders();
        }
        return next.doWrite(chunk);
    }


    @Override
    public long getBytesWritten() {
        return next.getBytesWritten();
    }


    @Override
    public void end() throws IOException {
        next.end();
    }


    @Override
    public void flush() throws IOException {
        next.flush();
    }
}