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/*
* PartHeaderConsumer.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 java.io.IOException;
import org.simpleframework.common.buffer.Allocator;
import org.simpleframework.common.buffer.Buffer;
/**
* The <code>PartHeaderConsumer</code> object is used to consume the
* header for a multipart message. This performs a parse of the
* HTTP headers within the message up to the terminal carriage return
* and line feed token. Once this had been read the contents of the
* header are appended to a buffer so they can be read later.
*
* @author Niall Gallagher
*/
class PartHeaderConsumer extends SegmentConsumer {
/**
* This is used to allocate the internal buffer for the header.
*/
private Allocator allocator;
/**
* This is the internal buffer used to store the header.
*/
private Buffer buffer;
/**
* Constructor for the <code>PartHeaderConsumer</code> object. An
* allocator is required so that the header consumer can create a
* buffer to store the contents of the consumed message.
*
* @param allocator this is the allocator used to create a buffer
*/
public PartHeaderConsumer(Allocator allocator) {
this.allocator = allocator;
}
/**
* This is used to process the header consumer once all of the
* headers have been read. This will simply parse all of the
* headers and append the consumed bytes to the internal buffer.
* Appending the bytes ensures that the whole upload can be
* put back together as a single byte stream if required.
*/
@Override
protected void process() throws IOException {
headers();
append();
}
/**
* This is used to allocate the internal buffer and append the
* consumed bytes to the buffer. Once the header is added to
* the internal buffer this is finished and the next part of
* the upload can be consumed.
*/
private void append() throws IOException {
if(buffer == null) {
buffer = allocator.allocate(count);
}
buffer.append(array, 0, count);
}
}
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