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package com.pdd.pop.ext.glassfish.grizzly.http;
import com.pdd.pop.ext.glassfish.grizzly.Buffer;
import com.pdd.pop.ext.glassfish.grizzly.filterchain.FilterChainContext;
import com.pdd.pop.ext.glassfish.grizzly.http.HttpCodecFilter.ContentParsingState;
/**
* Fixed length transfer encoding implementation.
*
* @see TransferEncoding
*
* @author Alexey Stashok
*/
public final class FixedLengthTransferEncoding implements TransferEncoding {
public FixedLengthTransferEncoding() {
}
/**
* {@inheritDoc}
*/
@Override
public boolean wantDecode(HttpHeader httpPacket) {
final long contentLength = httpPacket.getContentLength();
return (contentLength != -1);
}
/**
* {@inheritDoc}
*/
@Override
public boolean wantEncode(HttpHeader httpPacket) {
final long contentLength = httpPacket.getContentLength();
return (contentLength != -1);
}
@Override
public void prepareSerialize(FilterChainContext ctx,
HttpHeader httpHeader,
HttpContent httpContent) {
final int defaultContentLength = httpContent != null ?
httpContent.getContent().remaining() : -1;
httpHeader.makeContentLengthHeader(defaultContentLength);
}
/**
* {@inheritDoc}
*/
@Override
@SuppressWarnings({"UnusedDeclaration"})
public ParsingResult parsePacket(FilterChainContext ctx,
HttpHeader httpPacket,
Buffer input) {
final HttpPacketParsing httpPacketParsing = (HttpPacketParsing) httpPacket;
// Get HTTP content parsing state
final ContentParsingState contentParsingState =
httpPacketParsing.getContentParsingState();
if (contentParsingState.chunkRemainder == -1) {
// if we have just parsed a HTTP message header
// assign chunkRemainder to the HTTP message content length
contentParsingState.chunkRemainder = httpPacket.getContentLength();
}
Buffer remainder = null;
final long thisPacketRemaining = contentParsingState.chunkRemainder;
final int available = input.remaining();
if (available > thisPacketRemaining) {
// if input Buffer has part of the next HTTP message - slice it
remainder = input.slice(
(int) (input.position() + thisPacketRemaining), input.limit());
input.limit((int) (input.position() + thisPacketRemaining));
}
// recalc. the HTTP message remaining bytes
contentParsingState.chunkRemainder -= input.remaining();
final boolean isLast = (contentParsingState.chunkRemainder == 0);
return ParsingResult.create(httpPacket.httpContentBuilder().content(input)
.last(isLast).build(), remainder);
}
/**
* {@inheritDoc}
*/
@Override
public Buffer serializePacket(FilterChainContext ctx, HttpContent httpContent) {
return httpContent.getContent();
}
}