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/*
* PartEntryConsumer.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.transport.ByteCursor;
/**
* The <code>PartEntryConsumer</code> object is used to consume each
* part from the part list. This is combines the task of consuming
* the part, which consists of a header and a body, and a boundary
* which identifies the end of the message content.
*
* @author Niall Gallagher
*/
class PartEntryConsumer implements ByteConsumer {
/**
* This is used to consume the boundary at the end of a part.
*/
private final BoundaryConsumer boundary;
/**
* This is used to consume the actual part from the list.
*/
private final ByteConsumer consumer;
/**
* Constructor for the <code>PartEntryConsumer</code> object. This
* is used to create a consumer that will read the message part
* and the boundary that terminates the part. All contents that
* are read are appended to an internal buffer.
*
* @param allocator this is the allocator used for the buffer
* @param series this is the list used to accumulate the parts
* @param terminal this is the terminal token for the part list
* @param length this is the length of the parent part series
*/
public PartEntryConsumer(Allocator allocator, PartSeries series, byte[] terminal, long length) {
this.consumer = new PartConsumer(allocator, series, terminal, length);
this.boundary = new BoundaryConsumer(allocator, terminal);
}
/**
* This is used to consume the part body from the cursor. This
* initially reads the body of the part, which represents the
* actual content exposed via the <code>Part</code> interface
* once the content has been consumed the terminal is consumed.
*
* @param cursor this is the cursor to consume the body from
*/
public void consume(ByteCursor cursor) throws IOException {
while(cursor.isReady()) {
if(!boundary.isFinished()) {
boundary.consume(cursor);
} else {
if(consumer.isFinished()) {
break;
}
if(boundary.isEnd()) {
break;
}
consumer.consume(cursor);
}
}
}
/**
* This is used to determine whether the part body has been read
* from the cursor successfully. In order to determine if all of
* the bytes have been read successfully this will check to see
* of the terminal token had been consumed.
*
* @return true if the part body and terminal have been read
*/
public boolean isFinished() {
if(boundary.isEnd()) {
return true;
}
return consumer.isFinished();
}
/**
* This is used to determine whether the terminal token read is
* the final terminal token. The final terminal token is a
* normal terminal token, however it ends with two hyphens and
* a carriage return line feed, this ends the part list.
*
* @return true if this was the last part within the list
*/
public boolean isEnd() {
return boundary.isEnd();
}
}
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