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package com.sun.enterprise.web.ara.algorithms;
import com.sun.enterprise.web.connector.grizzly.SelectorThread;
import com.sun.enterprise.web.connector.grizzly.StreamAlgorithm;
import com.sun.enterprise.web.connector.grizzly.Handler;
import java.nio.ByteBuffer;
import java.nio.BufferUnderflowException;
import java.nio.channels.SocketChannel;
/**
* Parse the request bytes and seek for the context-root value of the
* HTTP method.
*
* @author Jeanfrancois Arcand
*/
public class ContextRootAlgorithm implements StreamAlgorithm{
private int port = 8080;
private SocketChannel socketChannel;
public ContextRootAlgorithm() {
}
/**
* Allocate a <code>ByteBuffer</code>
* @param useDirect allocate a direct <code>ByteBuffer</code>.
* @param useView allocate a view <code>ByteBuffer</code>.
* @return a new <code>ByteBuffer</code>
*/
public ByteBuffer allocate(boolean useDirect, boolean useView, int size) {
throw new UnsupportedOperationException();
}
/**
* Return the stream content-length. If the content-length wasn't parsed,
* return -1.
*/
public int contentLength() {
throw new UnsupportedOperationException();
}
/**
* Return the stream header length. The header length is the length between
* the start of the stream and the first occurance of character '\r\n' .
*/
public int headerLength() {
throw new UnsupportedOperationException();
}
/**
* Parse the request line in search of the context-root bytes of the HTTP
* Method. The <code>ByteBuffer</code> position and limit refer
* respectively to the start and the end of the context root.
* @param byteBuffer The byteBuffer containing the requests bytes
* @return true if the context-root has been found.
*/
public boolean parse(ByteBuffer byteBuffer) {
boolean isFound = false;
int curPosition = byteBuffer.position();
int curLimit = byteBuffer.limit();
// Rule a - If nothing, return to the Selector.
if (byteBuffer.position() == 0)
return false;
byteBuffer.position(0);
byteBuffer.limit(curPosition);
int state =0;
int start =0;
int end = 0;
try {
byte c;
// Rule b - try to determine the context-root
while(byteBuffer.hasRemaining()) {
c = byteBuffer.get();
// State Machine
// 0 - Search for the first SPACE ' ' between the method and the
// the request URI
// 1 - Search for the second SPACE ' ' between the request URI
// and the method
switch(state) {
case 0: // Search for first ' '
if (c == 0x20){
state = 1;
start = byteBuffer.position() + 1;
}
break;
case 1: // Search for next ' '
if (c == 0x20){
end = byteBuffer.position() - 1;
return true;
}
break;
default:
throw new IllegalArgumentException("Unexpected state");
}
}
return false;
} catch (BufferUnderflowException bue) {
return false;
} finally {
if ( end > 0 ){
byteBuffer.position(start);
byteBuffer.limit(end);
} else {
byteBuffer.limit(curLimit);
byteBuffer.position(curPosition);
}
}
}
/**
* After parsing the bytes, post process the <code>ByteBuffer</code>
* @param byteBuffer the <code>ByteBuffer</code> used by this algorithm
* @return <code>ByteBuffer</code> used by this algorithm
*/
public ByteBuffer postParse(ByteBuffer byteBuffer) {
throw new UnsupportedOperationException();
}
/**
* Before parsing the bytes, initialize and prepare the algorithm.
* @param byteBuffer the <code>ByteBuffer</code> used by this algorithm
* @return <code>ByteBuffer</code> used by this algorithm
*/
public ByteBuffer preParse(ByteBuffer byteBuffer) {
throw new UnsupportedOperationException();
}
/**
* Recycle the algorithm.
*/
public void recycle() {
}
/**
* Rollback the <code>ByteBuffer</code> to its previous state in case
* an error as occured.
*/
public ByteBuffer rollbackParseState(ByteBuffer byteBuffer) {
throw new UnsupportedOperationException();
}
/**
* Return the class responsible for handling OP_READ.
*/
public Class getReadTask(SelectorThread selectorThread){
return com.sun.enterprise.web.connector.grizzly.DefaultReadTask.class;
}
// ----------------------------------------------------- Util -----------//
/**
* Dump the ByteBuffer content. This is used only for debugging purpose.
*/
private String dump(ByteBuffer byteBuffer){
ByteBuffer dd = byteBuffer.duplicate();
dd.flip();
int length = dd.limit();
byte[] dump = new byte[length];
dd.get(dump,0,length);
return(new String(dump) + "\n----------------------------" + dd);
}
/**
* Set the <code>SocketChannel</code> used by this class.
*/
public void setSocketChannel(SocketChannel socketChannel){
this.socketChannel = socketChannel;
}
/**
* Return null as handler aren't required.
*/
public Handler getHandler(){
return null;
}
/**
* Set the port
*/
public void setPort(int port){
this.port = port;
}
/**
* Return the port
*/
public int getPort(){
return port;
}
}
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