Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* 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.jboss.remoting.transport.coyote;
import java.io.IOException;
import java.io.Reader;
import java.util.HashMap;
import org.apache.coyote.Request;
import org.apache.tomcat.util.buf.B2CConverter;
import org.apache.tomcat.util.buf.ByteChunk;
import org.apache.tomcat.util.buf.CharChunk;
/**
* The buffer used by Tomcat request. This is a derivative of the Tomcat 3.3
* OutputBuffer, adapted to handle input instead of output. This allows
* complete recycling of the facade objects (the ServletInputStream and the
* BufferedReader).
*
* @author Remy Maucherat
*/
public class InputBuffer extends Reader
implements ByteChunk.ByteInputChannel, CharChunk.CharInputChannel,
CharChunk.CharOutputChannel
{
// -------------------------------------------------------------- Constants
public static final String DEFAULT_ENCODING =
org.apache.coyote.Constants.DEFAULT_CHARACTER_ENCODING;
public static final int DEFAULT_BUFFER_SIZE = 8 * 1024;
// The buffer can be used for byte[] and char[] reading
// ( this is needed to support ServletInputStream and BufferedReader )
public final int INITIAL_STATE = 0;
public final int CHAR_STATE = 1;
public final int BYTE_STATE = 2;
// ----------------------------------------------------- Instance Variables
/**
* The byte buffer.
*/
private ByteChunk bb;
/**
* The chunk buffer.
*/
private CharChunk cb;
/**
* State of the output buffer.
*/
private int state = 0;
/**
* Number of bytes read.
*/
private int bytesRead = 0;
/**
* Number of chars read.
*/
private int charsRead = 0;
/**
* Flag which indicates if the input buffer is closed.
*/
private boolean closed = false;
/**
* Byte chunk used to input bytes.
*/
private ByteChunk inputChunk = new ByteChunk();
/**
* Encoding to use.
*/
private String enc;
/**
* Encoder is set.
*/
private boolean gotEnc = false;
/**
* List of encoders.
*/
protected HashMap encoders = new HashMap();
/**
* Current byte to char converter.
*/
protected B2CConverter conv;
/**
* Associated Coyote request.
*/
private Request coyoteRequest;
/**
* Buffer position.
*/
private int markPos = -1;
/**
* Buffer size.
*/
private int size = -1;
// ----------------------------------------------------------- Constructors
/**
* Default constructor. Allocate the buffer with the default buffer size.
*/
public InputBuffer()
{
this(DEFAULT_BUFFER_SIZE);
}
/**
* Alternate constructor which allows specifying the initial buffer size.
*
* @param size Buffer size to use
*/
public InputBuffer(int size)
{
this.size = size;
bb = new ByteChunk(size);
bb.setLimit(size);
bb.setByteInputChannel(this);
cb = new CharChunk(size);
cb.setLimit(size);
cb.setOptimizedWrite(false);
cb.setCharInputChannel(this);
cb.setCharOutputChannel(this);
}
// ------------------------------------------------------------- Properties
/**
* Associated Coyote request.
*
* @param coyoteRequest Associated Coyote request
*/
public void setRequest(Request coyoteRequest)
{
this.coyoteRequest = coyoteRequest;
}
/**
* Get associated Coyote request.
*
* @return the associated Coyote request
*/
public Request getRequest()
{
return this.coyoteRequest;
}
// --------------------------------------------------------- Public Methods
/**
* Recycle the output buffer.
*/
public void recycle()
{
state = INITIAL_STATE;
bytesRead = 0;
charsRead = 0;
// If usage of mark made the buffer too big, reallocate it
if(cb.getChars().length > size)
{
cb = new CharChunk(size);
cb.setLimit(size);
cb.setCharInputChannel(this);
cb.setCharOutputChannel(this);
}
else
{
cb.recycle();
}
markPos = -1;
bb.recycle();
closed = false;
if(conv != null)
{
conv.recycle();
}
gotEnc = false;
enc = null;
}
/**
* Close the input buffer.
*
* @throws IOException An underlying IOException occurred
*/
public void close()
throws IOException
{
closed = true;
}
public int available()
throws IOException
{
if(state == BYTE_STATE)
{
return bb.getLength();
}
else if(state == CHAR_STATE)
{
return cb.getLength();
}
else
{
return 0;
}
}
// ------------------------------------------------- Bytes Handling Methods
/**
* Reads new bytes in the byte chunk.
*
* @param cbuf Byte buffer to be written to the response
* @param off Offset
* @param len Length
* @throws IOException An underlying IOException occurred
*/
public int realReadBytes(byte cbuf[], int off, int len)
throws IOException
{
if(closed)
{
return -1;
}
if(coyoteRequest == null)
{
return -1;
}
state = BYTE_STATE;
int result = coyoteRequest.doRead(bb);
return result;
}
public int readByte()
throws IOException
{
return bb.substract();
}
public int read(byte[] b, int off, int len)
throws IOException
{
return bb.substract(b, off, len);
}
// ------------------------------------------------- Chars Handling Methods
/**
* Since the converter will use append, it is possible to get chars to
* be removed from the buffer for "writing". Since the chars have already
* been read before, they are ignored. If a mark was set, then the
* mark is lost.
*/
public void realWriteChars(char c[], int off, int len)
throws IOException
{
markPos = -1;
}
public void setEncoding(String s)
{
enc = s;
}
public int realReadChars(char cbuf[], int off, int len)
throws IOException
{
if(!gotEnc)
{
setConverter();
}
if(bb.getLength() <= 0)
{
int nRead = realReadBytes(bb.getBytes(), 0, bb.getBytes().length);
if(nRead < 0)
{
return -1;
}
}
if(markPos == -1)
{
cb.setOffset(0);
cb.setEnd(0);
}
conv.convert(bb, cb);
bb.setOffset(bb.getEnd());
state = CHAR_STATE;
return cb.getLength();
}
public int read()
throws IOException
{
return cb.substract();
}
public int read(char[] cbuf)
throws IOException
{
return read(cbuf, 0, cbuf.length);
}
public int read(char[] cbuf, int off, int len)
throws IOException
{
return cb.substract(cbuf, off, len);
}
public long skip(long n)
throws IOException
{
if(n < 0)
{
throw new IllegalArgumentException();
}
long nRead = 0;
while(nRead < n)
{
if(cb.getLength() >= n)
{
cb.setOffset(cb.getStart() + (int) n);
nRead = n;
}
else
{
nRead += cb.getLength();
cb.setOffset(cb.getEnd());
int toRead = 0;
if(cb.getChars().length < (n - nRead))
{
toRead = cb.getChars().length;
}
else
{
toRead = (int) (n - nRead);
}
int nb = realReadChars(cb.getChars(), 0, toRead);
if(nb < 0)
{
break;
}
}
}
return nRead;
}
public boolean ready()
throws IOException
{
return (cb.getLength() > 0);
}
public boolean markSupported()
{
return true;
}
public void mark(int readAheadLimit)
throws IOException
{
if(cb.getLength() <= 0)
{
cb.setOffset(0);
cb.setEnd(0);
}
else
{
if((cb.getBuffer().length > (2 * size))
&& (cb.getLength()) < (cb.getStart()))
{
System.arraycopy(cb.getBuffer(), cb.getStart(),
cb.getBuffer(), 0, cb.getLength());
cb.setEnd(cb.getLength());
cb.setOffset(0);
}
}
int offset = readAheadLimit;
if(offset < size)
{
offset = size;
}
cb.setLimit(cb.getStart() + offset);
markPos = cb.getStart();
}
public void reset()
throws IOException
{
if(state == CHAR_STATE)
{
if(markPos < 0)
{
cb.recycle();
markPos = -1;
throw new IOException();
}
else
{
cb.setOffset(markPos);
}
}
else
{
bb.recycle();
}
}
public void checkConverter()
throws IOException
{
if(!gotEnc)
{
setConverter();
}
}
protected void setConverter()
throws IOException
{
if(coyoteRequest != null)
{
enc = coyoteRequest.getCharacterEncoding();
}
gotEnc = true;
if(enc == null)
{
enc = DEFAULT_ENCODING;
}
conv = (B2CConverter) encoders.get(enc);
if(conv == null)
{
conv = new B2CConverter(enc);
encoders.put(enc, conv);
}
}
}
