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/*
* BodyEncoderFactory.java February 2007
*
* Copyright (C) 2001, Niall Gallagher <niallg@users.sf.net>
*
* Licensed 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.simpleframework.http.core;
import org.simpleframework.transport.Channel;
import org.simpleframework.transport.ByteWriter;
/**
* The <code>BodyEncoderFactory</code> is used to create a producer to
* match the HTTP header sent with the response. This interprets the
* headers within the response and composes a producer that will
* match those. Producers can be created to send in chunked encoding
* format, as well as fixed length and connection close for HTTP/1.0.
*
* @author Niall Gallagher
*
* @see org.simpleframework.http.core.ResponseEncoder
*/
class BodyEncoderFactory {
/**
* This is used to determine the semantics of the HTTP pipeline.
*/
private final Conversation support;
/**
* This is the monitor used to notify the initiator of events.
*/
private final BodyObserver observer;
/**
* This is the underlying sender used to deliver the raw data.
*/
private final ByteWriter writer;
/**
* Constructor for the <code>BodyEncoderFactory</code> object.
* This is used to create producers that can encode data in a HTTP
* compliant format. Each producer created will produce its data
* and deliver it to the specified sender, should an I/O events
* occur such as an error, or completion of the response then
* the monitor is notified and the server kernel takes action.
*
* @param observer this is used to deliver signals to the kernel
* @param support this contains details regarding the semantics
* @param writer this is used to send to the underlying transport
*/
public BodyEncoderFactory(BodyObserver observer, Conversation support, Channel channel) {
this.writer = channel.getWriter();
this.observer = observer;
this.support = support;
}
/**
* This is used to create an a <code>BodyEncoder</code> object
* that can be used to encode content according to the HTTP header.
* If the request was from a HTTP/1.0 client that did not ask
* for keep alive connection semantics a simple close producer
* is created. Otherwise the content is chunked encoded or sent
* according the the Content-Length.
*
* @return this returns the producer used to send the response
*/
public BodyEncoder getInstance() {
boolean keepAlive = support.isKeepAlive();
boolean chunkable = support.isChunkedEncoded();
boolean tunnel = support.isTunnel();
if(!keepAlive || tunnel) {
return new CloseEncoder(observer, writer);
}
return getInstance(chunkable);
}
/**
* This is used to create an a <code>BodyEncoder</code> object
* that can be used to encode content according to the HTTP header.
* If the request was from a HTTP/1.0 client that did not ask
* for keep alive connection semantics a simple close producer
* is created. Otherwise the content is chunked encoded or sent
* according the the Content-Length.
*
* @param chunkable does the connected client support chunked
*
* @return this returns the producer used to send the response
*/
private BodyEncoder getInstance(boolean chunkable) {
long length = support.getContentLength();
if(!support.isHead()) {
if(length > 0) {
return new FixedLengthEncoder(observer, writer, length);
}
if(chunkable) {
return new ChunkedEncoder(observer, writer);
}
}
return new EmptyEncoder(observer, writer);
}
}
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