/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.server.http;
import com.caucho.util.L10N;
import com.caucho.vfs.Encoding;
import com.caucho.vfs.TempCharBuffer;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.logging.Level;
import java.util.logging.Logger;
abstract public class ToCharResponseStream extends AbstractResponseStream {
private static final Logger log
= Logger.getLogger(ToCharResponseStream.class.getName());
static final L10N L = new L10N(ToCharResponseStream.class);
private static final int SIZE = TempCharBuffer.SIZE;
private final byte []_byteBuffer = new byte[SIZE];
// head of the expandable buffer
private TempCharBuffer _head = TempCharBuffer.allocate();
private TempCharBuffer _tail;
private char []_charBuffer;
private int _charLength;
private int _bufferCapacity;
private int _bufferSize;
private BufferInputStream _in;
private Reader _encodingReader;
public ToCharResponseStream()
{
}
/**
* Initializes the Buffered Response stream at the beginning of a request.
*/
@Override
public void start()
{
super.start();
_head.clear();
_head.setNext(null);
_tail = _head;
_charBuffer = _tail.getBuffer();
_charLength = 0;
_bufferCapacity = SIZE;
_bufferSize = 0;
_encodingReader = null;
// _toChar = Encoding.getReadEncoding("ISO-8859-1");
}
/**
* Returns true for a caucho response stream.
*/
public boolean isCauchoResponseStream()
{
// server/1b13
return false;
}
/**
* Sets the buffer size.
*/
public void setBufferSize(int size)
{
size = (size + SIZE - 1);
size -= size % SIZE;
if (_bufferCapacity < size)
_bufferCapacity = size;
}
/**
* Gets the buffer size.
*/
public int getBufferSize()
{
return _bufferCapacity;
}
/**
* Returns the remaining buffer entries.
*/
public int getRemaining()
{
return _bufferCapacity - _bufferSize - _charLength;
}
/**
* Returns the char buffer.
*/
public char []getCharBuffer()
{
return _charBuffer;
}
/**
* Returns the char offset.
*/
public int getCharOffset()
{
return _charLength;
}
/**
* Sets the char offset.
*/
public void setCharOffset(int offset)
throws IOException
{
_charLength = offset;
if (SIZE <= _charLength)
expandCharBuffer();
}
/**
* Converts the char buffer.
*/
public char []nextCharBuffer(int offset)
throws IOException
{
_charLength = offset;
if (SIZE <= _charLength)
expandCharBuffer();
return _charBuffer;
}
/**
* Writes a character to the output.
*/
public void print(int ch)
throws IOException
{
/*
if (_isClosed)
return;
*/
_charBuffer[_charLength++] = (char) ch;
if (SIZE <= _charLength)
expandCharBuffer();
}
/**
* Writes a char array to the output.
*/
@Override
public void print(char []buffer, int offset, int length)
throws IOException
{
/*
if (_isHead || _isClosed)
return;
if (_byteLength > 0)
flushByteBuffer();
*/
int charLength = _charLength;
while (length > 0) {
int sublen = length;
if (SIZE - charLength < sublen)
sublen = SIZE - charLength;
System.arraycopy(buffer, offset, _charBuffer, charLength, sublen);
offset += sublen;
length -= sublen;
charLength += sublen;
if (SIZE <= charLength) {
_charLength = charLength;
expandCharBuffer();
charLength = _charLength;
}
}
_charLength = charLength;
}
/**
* Returns the buffer offset.
*/
public int getBufferOffset()
{
return 0;
}
/**
* Sets the byte buffer offset.
*/
public void setBufferOffset(int offset)
{
if (offset > 0) {
try {
write(_byteBuffer, 0, offset);
} catch (IOException e) {
log.log(Level.FINE, e.toString(), e);
}
}
}
/**
* Gets the byte buffer
*/
public byte []getBuffer()
{
return _byteBuffer;
}
/**
* Returns the next buffer.
*/
public byte []nextBuffer(int offset)
throws IOException
{
if (offset > 0)
write(_byteBuffer, 0, offset);
return _byteBuffer;
}
/**
* Writes the next chunk of data to the response stream.
*
* @param buf the buffer containing the data
* @param offset start offset into the buffer
* @param length length of the data in the buffer
*/
public void write(byte []buf, int offset, int length)
throws IOException
{
if (length == 0)
return;
if (_encodingReader == null) {
// server/1b13
if (_in == null)
_in = new BufferInputStream();
_encodingReader = Encoding.getReadEncoding(_in, getEncoding());
}
// XXX: performance issues
if (_encodingReader == null) {
for (; length > 0; length--) {
print((char) buf[offset++]);
}
return;
}
_in.init(buf, offset, length);
// XXX: performance issues
int ch;
while ((ch = _encodingReader.read()) >= 0) {
print(ch);
}
}
/**
* Writes the next chunk of data to the response stream.
*
* @param buf the buffer containing the data
* @param offset start offset into the buffer
* @param length length of the data in the buffer
*/
public void write(int ch)
throws IOException
{
if (_encodingReader == null) {
if (_in == null)
_in = new BufferInputStream();
_byteBuffer[0] = (byte) ch;
_encodingReader = Encoding.getReadEncoding(_in, getEncoding());
if (_encodingReader == null) {
print((char) ch);
return;
}
}
_byteBuffer[0] = (byte) ch;
_in.init(_byteBuffer, 0, 1);
while ((ch = _encodingReader.read()) >= 0) {
print(ch);
}
}
/**
* Flushes the buffer.
*/
@Override
public void flushBuffer()
throws IOException
{
flushCharBuffer();
}
/**
* Flushes the buffer.
*/
@Override
public void flushChar()
throws IOException
{
flushCharBuffer();
}
/**
* Flushes or writes to the buffer.
*/
private void expandCharBuffer()
throws IOException
{
if (_bufferCapacity <= _bufferSize + _charLength) {
flushCharBuffer();
}
else if (_charLength == SIZE) {
_tail.setLength(_charLength);
_bufferSize += _charLength;
TempCharBuffer tempBuf = TempCharBuffer.allocate();
_tail.setNext(tempBuf);
_tail = tempBuf;
_charBuffer = _tail.getBuffer();
_charLength = 0;
}
}
/**
* Flushes the buffered response to the output stream.
*/
private void flushCharBuffer()
throws IOException
{
_tail.setLength(_charLength);
_bufferSize += _charLength;
_charLength = 0;
TempCharBuffer ptr = _head;
do {
_head = ptr;
TempCharBuffer next = ptr.getNext();
ptr.setNext(null);
writeNext(ptr.getBuffer(), 0, ptr.getLength());
if (next != null)
TempCharBuffer.free(ptr);
ptr = next;
} while (ptr != null);
_tail = _head;
_tail.setLength(0);
_charBuffer = _tail.getBuffer();
_bufferSize = 0;
}
/**
* Flushes the buffer.
*/
@Override
public void clearBuffer()
{
_charLength = 0;
TempCharBuffer ptr = _head;
do {
_head = ptr;
TempCharBuffer next = ptr.getNext();
ptr.setNext(null);
if (next != null)
TempCharBuffer.free(ptr);
ptr = next;
} while (ptr != null);
_tail = _head;
_tail.setLength(0);
_charBuffer = _head.getBuffer();
_bufferSize = 0;
}
/**
* Returns the encoding.
*/
abstract public String getEncoding();
/**
* Writes to the next.
*/
abstract protected void writeNext(char []buffer, int offset, int length)
throws IOException;
static class BufferInputStream extends InputStream {
private byte []_buffer;
private int _offset;
private int _length;
void init(byte []buffer, int offset, int length)
{
_buffer = buffer;
_offset = offset;
_length = length;
}
public int read()
{
if (_offset < _length)
return _buffer[_offset++] & 0xff;
else
return -1;
}
}
}