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/*
* ConsumerFactory.java February 2007
*
* Copyright (C) 2007, 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.message;
import static org.simpleframework.http.Protocol.BOUNDARY;
import static org.simpleframework.http.Protocol.CHUNKED;
import static org.simpleframework.http.Protocol.MULTIPART;
import org.simpleframework.common.buffer.Allocator;
import org.simpleframework.http.ContentType;
/**
* The <code>ConsumerFactory</code> object is used to create a factory
* for creating consumers. This allows the request to determine the
* type of content sent and allows consumption of the request body in
* a the manner specified by the HTTP header. This will allow multipart
* and chunked content to be consumed from the pipeline.
*
* @author Niall Gallagher
*/
class ConsumerFactory {
/**
* This is used to allocate the memory associated with the body.
*/
protected Allocator allocator;
/**
* This is the header associated with the request body consumed.
*/
protected Segment segment;
/**
* Constructor for the <code>ConsumerFactory</code> object. This
* will create a factory that makes use of the HTTP header in order
* to determine the type of the body that is to be consumed.
*
* @param allocator this is the allocator used to allocate memory
* @param segment this is the HTTP header used to determine type
*/
public ConsumerFactory(Allocator allocator, Segment segment) {
this.allocator = allocator;
this.segment = segment;
}
/**
* This method is used to create a body consumer to read the body
* from the pipeline. This will examine the HTTP header associated
* with the body to determine how to consume the data. This will
* provide an empty consumer if no specific delimiter was provided.
*
* @return this returns the consumer used to consume the body
*/
public BodyConsumer getInstance() {
long length = getContentLength();
if(length < 0) {
return getInstance(8192);
}
return getInstance(length);
}
/**
* This method is used to create a body consumer to read the body
* from the pipeline. This will examine the HTTP header associated
* with the body to determine how to consume the data. This will
* provide an empty consumer if no specific delimiter was provided.
*
* @param length this is the length of the body to be consumed
*
* @return this returns the consumer used to consume the body
*/
public BodyConsumer getInstance(long length) {
byte[] boundary = getBoundary(segment);
if(isUpload(segment)) {
return new FileUploadConsumer(allocator, boundary, length);
}
if(isChunked(segment)) {
return new ChunkedConsumer(allocator);
}
if(isFixed(segment)) {
return new FixedLengthConsumer(allocator, length);
}
return new EmptyConsumer();
}
/**
* This is used to extract information from the HTTP header that
* can be used to determine the type of the body. This will look
* at the HTTP headers provided to find a specific token which
* enables it to determine how to consume the body.
*
* @param header this is the header associated with the body
*
* @return the boundary for a multipart upload body
*/
protected byte[] getBoundary(Segment header) {
ContentType type = header.getContentType();
if(type != null) {
String token = type.getParameter(BOUNDARY);
if(token != null) {
return token.getBytes();
}
}
return null;
}
/**
* This is used to extract information from the HTTP header that
* can be used to determine the type of the body. This will look
* at the HTTP headers provided to find a specific token which
* enables it to determine how to consume the body.
*
* @param segment this is the header associated with the body
*
* @return true if the content type is that of a multipart body
*/
protected boolean isUpload(Segment segment) {
ContentType type = segment.getContentType();
if(type != null) {
String token = type.getPrimary();
if(token.equals(MULTIPART)) {
return true;
}
}
return false;
}
/**
* This is used to extract information from the HTTP header that
* can be used to determine the type of the body. This will look
* at the HTTP headers provided to find a specific token which
* enables it to determine how to consume the body.
*
* @param segment this is the header associated with the body
*
* @return true if the body is to be consumed as a chunked body
*/
protected boolean isChunked(Segment segment) {
String encoding = segment.getTransferEncoding();
if(encoding != null) {
if(encoding.equals(CHUNKED)) {
return true;
}
}
return false;
}
/**
* This is used to extract information from the HTTP header that
* can be used to determine the type of the body. This will look
* at the HTTP headers provided to find a specific token which
* enables it to determine how to consume the body.
*
* @param segment this is the header associated with the body
*
* @return true if there was a content length in the header
*/
protected boolean isFixed(Segment segment) {
long length = segment.getContentLength();
if(length > 0) {
return true;
}
return false;
}
/**
* This is a convenience method that can be used to determine
* the length of the message body. This will determine if there
* is a <code>Content-Length</code> header, if it does then the
* length can be determined, if not then this returns -1.
*
* @return the content length, or -1 if it cannot be determined
*/
protected long getContentLength() {
return segment.getContentLength();
}
}
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