org.cassandraunit.shaded.org.codehaus.jackson.impl.StreamBasedParserBase Maven / Gradle / Ivy
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package org.codehaus.jackson.impl;
import java.io.*;
import org.codehaus.jackson.io.IOContext;
/**
* This is a simple low-level input reader base class, used by
* JSON parser. It is used when underlying input source is
* a byte stream such as {@link InputStream}.
* The reason for sub-classing (over composition)
* is due to need for direct access to low-level byte buffers
* and positions.
*
* @author Tatu Saloranta
*
* @deprecated Since 1.9, sub-classes should just embed code from here
*/
@Deprecated
public abstract class StreamBasedParserBase
extends JsonParserBase
{
/*
/**********************************************************
/* Configuration
/**********************************************************
*/
/**
* Input stream that can be used for reading more content, if one
* in use. May be null, if input comes just as a full buffer,
* or if the stream has been closed.
*/
protected InputStream _inputStream;
/*
/**********************************************************
/* Current input data
/**********************************************************
*/
/**
* Current buffer from which data is read; generally data is read into
* buffer from input source, but in some cases pre-loaded buffer
* is handed to the parser.
*/
protected byte[] _inputBuffer;
/**
* Flag that indicates whether the input buffer is recycable (and
* needs to be returned to recycler once we are done) or not.
*
* If it is not, it also means that parser can NOT modify underlying
* buffer.
*/
protected boolean _bufferRecyclable;
/*
/**********************************************************
/* Life-cycle
/**********************************************************
*/
protected StreamBasedParserBase(IOContext ctxt, int features,
InputStream in, byte[] inputBuffer, int start, int end,
boolean bufferRecyclable)
{
super(ctxt, features);
_inputStream = in;
_inputBuffer = inputBuffer;
_inputPtr = start;
_inputEnd = end;
_bufferRecyclable = bufferRecyclable;
}
/*
/**********************************************************
/* Overrides
/**********************************************************
*/
@Override
public int releaseBuffered(OutputStream out) throws IOException
{
int count = _inputEnd - _inputPtr;
if (count < 1) {
return 0;
}
// let's just advance ptr to end
int origPtr = _inputPtr;
out.write(_inputBuffer, origPtr, count);
return count;
}
@Override
public Object getInputSource() {
return _inputStream;
}
/*
/**********************************************************
/* Low-level reading, other
/**********************************************************
*/
@Override
protected final boolean loadMore()
throws IOException
{
_currInputProcessed += _inputEnd;
_currInputRowStart -= _inputEnd;
if (_inputStream != null) {
int count = _inputStream.read(_inputBuffer, 0, _inputBuffer.length);
if (count > 0) {
_inputPtr = 0;
_inputEnd = count;
return true;
}
// End of input
_closeInput();
// Should never return 0, so let's fail
if (count == 0) {
throw new IOException("InputStream.read() returned 0 characters when trying to read "+_inputBuffer.length+" bytes");
}
}
return false;
}
/**
* Helper method that will try to load at least specified number bytes in
* input buffer, possible moving existing data around if necessary
*
* @since 1.6
*/
protected final boolean _loadToHaveAtLeast(int minAvailable)
throws IOException
{
// No input stream, no leading (either we are closed, or have non-stream input source)
if (_inputStream == null) {
return false;
}
// Need to move remaining data in front?
int amount = _inputEnd - _inputPtr;
if (amount > 0 && _inputPtr > 0) {
_currInputProcessed += _inputPtr;
_currInputRowStart -= _inputPtr;
System.arraycopy(_inputBuffer, _inputPtr, _inputBuffer, 0, amount);
_inputEnd = amount;
} else {
_inputEnd = 0;
}
_inputPtr = 0;
while (_inputEnd < minAvailable) {
int count = _inputStream.read(_inputBuffer, _inputEnd, _inputBuffer.length - _inputEnd);
if (count < 1) {
// End of input
_closeInput();
// Should never return 0, so let's fail
if (count == 0) {
throw new IOException("InputStream.read() returned 0 characters when trying to read "+amount+" bytes");
}
return false;
}
_inputEnd += count;
}
return true;
}
@Override
protected void _closeInput() throws IOException
{
/* 25-Nov-2008, tatus: As per [JACKSON-16] we are not to call close()
* on the underlying InputStream, unless we "own" it, or auto-closing
* feature is enabled.
*/
if (_inputStream != null) {
if (_ioContext.isResourceManaged() || isEnabled(Feature.AUTO_CLOSE_SOURCE)) {
_inputStream.close();
}
_inputStream = null;
}
}
@Override
protected void _releaseBuffers() throws IOException
{
super._releaseBuffers();
if (_bufferRecyclable) {
byte[] buf = _inputBuffer;
if (buf != null) {
_inputBuffer = null;
_ioContext.releaseReadIOBuffer(buf);
}
}
}
}