package org.codehaus.jackson.impl;
import java.io.IOException;
import java.io.Writer;
import java.math.BigDecimal;
import java.math.BigInteger;
import org.codehaus.jackson.Base64Variant;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.JsonStreamContext;
import org.codehaus.jackson.ObjectCodec;
import org.codehaus.jackson.io.IOContext;
import org.codehaus.jackson.io.NumberOutput;
import org.codehaus.jackson.util.CharTypes;
public final class WriterBasedGenerator
extends JsonGeneratorBase
{
final static int SHORT_WRITE = 32;
final static char[] HEX_CHARS = "0123456789ABCDEF".toCharArray();
/*
////////////////////////////////////////////////////
// Configuration
////////////////////////////////////////////////////
*/
final protected IOContext _ioContext;
final protected Writer _writer;
/*
////////////////////////////////////////////////////
// Output buffering
////////////////////////////////////////////////////
*/
/**
* Intermediate buffer in which contents are buffered before
* being written using {@link #_writer}.
*/
protected char[] _outputBuffer;
/**
* Pointer to the first buffered character to output
*/
protected int _outputHead = 0;
/**
* Pointer to the position right beyond the last character to output
* (end marker; may be past the buffer)
*/
protected int _outputTail = 0;
/**
* End marker of the output buffer; one past the last valid position
* within the buffer.
*/
protected int _outputEnd;
/**
* 6-char temporary buffer allocated if needed, for constructing
* escape sequences
*/
protected char[] _entityBuffer;
/*
////////////////////////////////////////////////////
// Life-cycle
////////////////////////////////////////////////////
*/
public WriterBasedGenerator(IOContext ctxt, int features, ObjectCodec codec,
Writer w)
{
super(features, codec);
_ioContext = ctxt;
_writer = w;
_outputBuffer = ctxt.allocConcatBuffer();
_outputEnd = _outputBuffer.length;
}
/*
////////////////////////////////////////////////////
// Output method implementations, structural
////////////////////////////////////////////////////
*/
@Override
protected void _writeStartArray()
throws IOException, JsonGenerationException
{
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '[';
}
@Override
protected void _writeEndArray()
throws IOException, JsonGenerationException
{
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = ']';
}
@Override
protected void _writeStartObject()
throws IOException, JsonGenerationException
{
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '{';
}
@Override
protected void _writeEndObject()
throws IOException, JsonGenerationException
{
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '}';
}
@Override
protected void _writeFieldName(String name, boolean commaBefore)
throws IOException, JsonGenerationException
{
if (_cfgPrettyPrinter != null) {
_writePPFieldName(name, commaBefore);
return;
}
// for fast+std case, need to output up to 2 chars, comma, dquote
if ((_outputTail + 1) >= _outputEnd) {
_flushBuffer();
}
if (commaBefore) {
_outputBuffer[_outputTail++] = ',';
}
/* To support [JACKSON-46], we'll do this:
* (Quostion: should quoting of spaces (etc) still be enabled?)
*/
if (!isEnabled(Feature.QUOTE_FIELD_NAMES)) {
_writeString(name);
return;
}
// we know there's room for at least one more char
_outputBuffer[_outputTail++] = '"';
// The beef:
_writeString(name);
// and closing quotes; need room for one more char:
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '"';
}
/**
* Specialized version of <code>_writeFieldName</code>, off-lined
* to keep the "fast path" as simple (and hopefully fast) as possible.
*/
protected final void _writePPFieldName(String name, boolean commaBefore)
throws IOException, JsonGenerationException
{
if (commaBefore) {
_cfgPrettyPrinter.writeObjectEntrySeparator(this);
} else {
_cfgPrettyPrinter.beforeObjectEntries(this);
}
if (isEnabled(Feature.QUOTE_FIELD_NAMES)) { // standard
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '"';
_writeString(name);
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '"';
} else { // non-standard, omit quotes
_writeString(name);
}
}
/*
////////////////////////////////////////////////////
// Output method implementations, textual
////////////////////////////////////////////////////
*/
@Override
public void writeString(String text)
throws IOException, JsonGenerationException
{
_verifyValueWrite("write text value");
if (text == null) {
_writeNull();
return;
}
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '"';
_writeString(text);
// And finally, closing quotes
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '"';
}
@Override
public void writeString(char[] text, int offset, int len)
throws IOException, JsonGenerationException
{
_verifyValueWrite("write text value");
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '"';
_writeString(text, offset, len);
// And finally, closing quotes
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '"';
}
/*
////////////////////////////////////////////////////
// Output method implementations, unprocessed ("raw")
////////////////////////////////////////////////////
*/
@Override
public void writeRaw(String text)
throws IOException, JsonGenerationException
{
// Nothing to check, can just output as is
int len = text.length();
int room = _outputEnd - _outputTail;
if (room == 0) {
_flushBuffer();
room = _outputEnd - _outputTail;
}
// But would it nicely fit in? If yes, it's easy
if (room >= len) {
text.getChars(0, len, _outputBuffer, _outputTail);
_outputTail += len;
} else {
writeRawLong(text);
}
}
@Override
public void writeRaw(String text, int start, int len)
throws IOException, JsonGenerationException
{
// Nothing to check, can just output as is
int room = _outputEnd - _outputTail;
if (room < len) {
_flushBuffer();
room = _outputEnd - _outputTail;
}
// But would it nicely fit in? If yes, it's easy
if (room >= len) {
text.getChars(start, start+len, _outputBuffer, _outputTail);
_outputTail += len;
} else {
writeRawLong(text.substring(start, start+len));
}
}
@Override
public void writeRaw(char[] text, int offset, int len)
throws IOException, JsonGenerationException
{
// Only worth buffering if it's a short write?
if (len < SHORT_WRITE) {
int room = _outputEnd - _outputTail;
if (len > room) {
_flushBuffer();
}
System.arraycopy(text, offset, _outputBuffer, _outputTail, len);
_outputTail += len;
return;
}
// Otherwise, better just pass through:
_flushBuffer();
_writer.write(text, offset, len);
}
@Override
public void writeRaw(char c)
throws IOException, JsonGenerationException
{
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = c;
}
@Override
public void writeRawValue(String text)
throws IOException, JsonGenerationException
{
_verifyValueWrite("write raw value");
writeRaw(text);
}
@Override
public void writeRawValue(String text, int offset, int len)
throws IOException, JsonGenerationException
{
_verifyValueWrite("write raw value");
writeRaw(text, offset, len);
}
@Override
public void writeRawValue(char[] text, int offset, int len)
throws IOException, JsonGenerationException
{
_verifyValueWrite("write raw value");
writeRaw(text, offset, len);
}
private void writeRawLong(String text)
throws IOException, JsonGenerationException
{
int room = _outputEnd - _outputTail;
// If not, need to do it by looping
text.getChars(0, room, _outputBuffer, _outputTail);
_outputTail += room;
_flushBuffer();
int offset = room;
int len = text.length() - room;
while (len > _outputEnd) {
int amount = _outputEnd;
text.getChars(offset, offset+amount, _outputBuffer, 0);
_outputHead = 0;
_outputTail = amount;
_flushBuffer();
offset += amount;
len -= amount;
}
// And last piece (at most length of buffer)
text.getChars(offset, offset+len, _outputBuffer, 0);
_outputHead = 0;
_outputTail = len;
}
/*
////////////////////////////////////////////////////
// Output method implementations, base64-encoded binary
////////////////////////////////////////////////////
*/
@Override
public void writeBinary(Base64Variant b64variant, byte[] data, int offset, int len)
throws IOException, JsonGenerationException
{
_verifyValueWrite("write binary value");
// Starting quotes
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '"';
_writeBinary(b64variant, data, offset, offset+len);
// and closing quotes
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '"';
}
/*
////////////////////////////////////////////////////
// Output method implementations, primitive
////////////////////////////////////////////////////
*/
@Override
public void writeNumber(int i)
throws IOException, JsonGenerationException
{
_verifyValueWrite("write number");
// up to 10 digits and possible minus sign
if ((_outputTail + 11) >= _outputEnd) {
_flushBuffer();
}
if (_cfgNumbersAsStrings) {
_writeQuotedInt(i);
return;
}
_outputTail = NumberOutput.outputInt(i, _outputBuffer, _outputTail);
}
private final void _writeQuotedInt(int i) throws IOException {
if ((_outputTail + 13) >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '"';
_outputTail = NumberOutput.outputInt(i, _outputBuffer, _outputTail);
_outputBuffer[_outputTail++] = '"';
}
@Override
public void writeNumber(long l)
throws IOException, JsonGenerationException
{
_verifyValueWrite("write number");
if (_cfgNumbersAsStrings) {
_writeQuotedLong(l);
return;
}
if ((_outputTail + 21) >= _outputEnd) {
// up to 20 digits, minus sign
_flushBuffer();
}
_outputTail = NumberOutput.outputLong(l, _outputBuffer, _outputTail);
}
private final void _writeQuotedLong(long l) throws IOException {
if ((_outputTail + 23) >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '"';
_outputTail = NumberOutput.outputLong(l, _outputBuffer, _outputTail);
_outputBuffer[_outputTail++] = '"';
}
// !!! 05-Aug-2008, tatus: Any ways to optimize these?
@Override
public void writeNumber(BigInteger value)
throws IOException, JsonGenerationException
{
_verifyValueWrite("write number");
if (value == null) {
_writeNull();
} else if (_cfgNumbersAsStrings) {
_writeQuotedRaw(value);
} else {
writeRaw(value.toString());
}
}
@Override
public void writeNumber(double d)
throws IOException, JsonGenerationException
{
if (_cfgNumbersAsStrings ||
// [JACKSON-139]
(((Double.isNaN(d) || Double.isInfinite(d))
&& isEnabled(Feature.QUOTE_NON_NUMERIC_NUMBERS)))) {
writeString(String.valueOf(d));
return;
}
// What is the max length for doubles? 40 chars?
_verifyValueWrite("write number");
writeRaw(String.valueOf(d));
}
@Override
public void writeNumber(float f)
throws IOException, JsonGenerationException
{
if (_cfgNumbersAsStrings ||
// [JACKSON-139]
(((Float.isNaN(f) || Float.isInfinite(f))
&& isEnabled(Feature.QUOTE_NON_NUMERIC_NUMBERS)))) {
writeString(String.valueOf(f));
return;
}
// What is the max length for floats?
_verifyValueWrite("write number");
writeRaw(String.valueOf(f));
}
@Override
public void writeNumber(BigDecimal value)
throws IOException, JsonGenerationException
{
// Don't really know max length for big decimal, no point checking
_verifyValueWrite("write number");
if (value == null) {
_writeNull();
} else if (_cfgNumbersAsStrings) {
_writeQuotedRaw(value);
} else {
writeRaw(value.toString());
}
}
@Override
public void writeNumber(String encodedValue)
throws IOException, JsonGenerationException
{
_verifyValueWrite("write number");
if (_cfgNumbersAsStrings) {
_writeQuotedRaw(encodedValue);
} else {
writeRaw(encodedValue);
}
}
private final void _writeQuotedRaw(Object value) throws IOException
{
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '"';
writeRaw(value.toString());
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail++] = '"';
}
@Override
public void writeBoolean(boolean state)
throws IOException, JsonGenerationException
{
_verifyValueWrite("write boolean value");
if ((_outputTail + 5) >= _outputEnd) {
_flushBuffer();
}
int ptr = _outputTail;
char[] buf = _outputBuffer;
if (state) {
buf[ptr] = 't';
buf[++ptr] = 'r';
buf[++ptr] = 'u';
buf[++ptr] = 'e';
} else {
buf[ptr] = 'f';
buf[++ptr] = 'a';
buf[++ptr] = 'l';
buf[++ptr] = 's';
buf[++ptr] = 'e';
}
_outputTail = ptr+1;
}
@Override
public void writeNull()
throws IOException, JsonGenerationException
{
_verifyValueWrite("write null value");
_writeNull();
}
/*
////////////////////////////////////////////////////
// Implementations for other methods
////////////////////////////////////////////////////
*/
@Override
protected final void _verifyValueWrite(String typeMsg)
throws IOException, JsonGenerationException
{
int status = _writeContext.writeValue();
if (status == JsonWriteContext.STATUS_EXPECT_NAME) {
_reportError("Can not "+typeMsg+", expecting field name");
}
if (_cfgPrettyPrinter == null) {
char c;
switch (status) {
case JsonWriteContext.STATUS_OK_AFTER_COMMA:
c = ',';
break;
case JsonWriteContext.STATUS_OK_AFTER_COLON:
c = ':';
break;
case JsonWriteContext.STATUS_OK_AFTER_SPACE:
c = ' ';
break;
case JsonWriteContext.STATUS_OK_AS_IS:
default:
return;
}
if (_outputTail >= _outputEnd) {
_flushBuffer();
}
_outputBuffer[_outputTail] = c;
++_outputTail;
return;
}
// Otherwise, pretty printer knows what to do...
_verifyPrettyValueWrite(typeMsg, status);
}
protected final void _verifyPrettyValueWrite(String typeMsg, int status)
throws IOException, JsonGenerationException
{
// If we have a pretty printer, it knows what to do:
switch (status) {
case JsonWriteContext.STATUS_OK_AFTER_COMMA: // array
_cfgPrettyPrinter.writeArrayValueSeparator(this);
break;
case JsonWriteContext.STATUS_OK_AFTER_COLON:
_cfgPrettyPrinter.writeObjectFieldValueSeparator(this);
break;
case JsonWriteContext.STATUS_OK_AFTER_SPACE:
_cfgPrettyPrinter.writeRootValueSeparator(this);
break;
case JsonWriteContext.STATUS_OK_AS_IS:
// First entry, but of which context?
if (_writeContext.inArray()) {
_cfgPrettyPrinter.beforeArrayValues(this);
} else if (_writeContext.inObject()) {
_cfgPrettyPrinter.beforeObjectEntries(this);
}
break;
default:
_cantHappen();
break;
}
}
/*
////////////////////////////////////////////////////
// Low-level output handling
////////////////////////////////////////////////////
*/
@Override
public final void flush()
throws IOException
{
_flushBuffer();
_writer.flush();
}
@Override
public void close()
throws IOException
{
super.close();
/* 05-Dec-2008, tatu: To add [JACKSON-27], need to close open
* scopes.
*/
// First: let's see that we still have buffers...
if (_outputBuffer != null
&& isEnabled(Feature.AUTO_CLOSE_JSON_CONTENT)) {
while (true) {
JsonStreamContext ctxt = getOutputContext();
if (ctxt.inArray()) {
writeEndArray();
} else if (ctxt.inObject()) {
writeEndObject();
} else {
break;
}
}
}
_flushBuffer();
/* 25-Nov-2008, tatus: As per [JACKSON-16] we are not to call close()
* on the underlying Reader, unless we "own" it, or auto-closing
* feature is enabled.
* One downside: when using UTF8Writer, underlying buffer(s)
* may not be properly recycled if we don't close the writer.
*/
if (_ioContext.isResourceManaged() || isEnabled(Feature.AUTO_CLOSE_TARGET)) {
_writer.close();
} else {
// If we can't close it, we should at least flush
_writer.flush();
}
// Internal buffer(s) generator has can now be released as well
_releaseBuffers();
}
@Override
protected void _releaseBuffers()
{
char[] buf = _outputBuffer;
if (buf != null) {
_outputBuffer = null;
_ioContext.releaseConcatBuffer(buf);
}
}
/*
////////////////////////////////////////////////////
// Internal methods, low-level writing
////////////////////////////////////////////////////
*/
private void _writeString(String text)
throws IOException, JsonGenerationException
{
/* One check first: if String won't fit in the buffer, let's
* segment writes. No point in extending buffer to huge sizes
* (like if someone wants to include multi-megabyte base64
* encoded stuff or such)
*/
int len = text.length();
if (len > _outputEnd) { // Let's reserve space for entity at begin/end
_writeLongString(text);
return;
}
// Ok: we know String will fit in buffer ok
// But do we need to flush first?
if ((_outputTail + len) > _outputEnd) {
_flushBuffer();
}
text.getChars(0, len, _outputBuffer, _outputTail);
// And then we'll need to verify need for escaping etc:
int end = _outputTail + len;
final int[] escCodes = CharTypes.getOutputEscapes();
final int escLen = escCodes.length;
output_loop:
while (_outputTail < end) {
// Fast loop for chars not needing escaping
escape_loop:
while (true) {
char c = _outputBuffer[_outputTail];
if (c < escLen && escCodes[c] != 0) {
break escape_loop;
}
if (++_outputTail >= end) {
break output_loop;
}
}
// Ok, bumped into something that needs escaping.
/* First things first: need to flush the buffer.
* Inlined, as we don't want to lose tail pointer
*/
int flushLen = (_outputTail - _outputHead);
if (flushLen > 0) {
_writer.write(_outputBuffer, _outputHead, flushLen);
}
/* In any case, tail will be the new start, so hopefully
* we have room now.
*/
{
int escCode = escCodes[_outputBuffer[_outputTail]];
++_outputTail;
int needLen = (escCode < 0) ? 6 : 2;
// If not, need to call separate method (note: buffer is empty now)
if (needLen > _outputTail) {
_outputHead = _outputTail;
_writeSingleEscape(escCode);
} else {
// But if it fits, can just prepend to buffer
int ptr = _outputTail - needLen;
_outputHead = ptr;
_appendSingleEscape(escCode, _outputBuffer, ptr);
}
}
}
}
/**
* Method called to write "long strings", strings whose length exceeds
* output buffer length.
*/
private void _writeLongString(String text)
throws IOException, JsonGenerationException
{
// First things first: let's flush the buffer to get some more room
_flushBuffer();
// Then we can write
final int textLen = text.length();
int offset = 0;
do {
int max = _outputEnd;
int segmentLen = ((offset + max) > textLen)
? (textLen - offset) : max;
text.getChars(offset, offset+segmentLen, _outputBuffer, 0);
_writeSegment(segmentLen);
offset += segmentLen;
} while (offset < textLen);
}
/**
* Method called to output textual context which has been copied
* to the output buffer prior to call. If any escaping is needed,
* it will also be handled by the method.
*<p>
* Note: when called, textual content to write is within output
* buffer, right after buffered content (if any). That's why only
* length of that text is passed, as buffer and offset are implied.
*/
private final void _writeSegment(int end)
throws IOException, JsonGenerationException
{
final int[] escCodes = CharTypes.getOutputEscapes();
final int escLen = escCodes.length;
int ptr = 0;
output_loop:
while (ptr < end) {
// Fast loop for chars not needing escaping
int start = ptr;
while (true) {
char c = _outputBuffer[ptr];
if (c < escLen && escCodes[c] != 0) {
break;
}
if (++ptr >= end) {
break;
}
}
// Ok, bumped into something that needs escaping.
/* First things first: need to flush the buffer.
* Inlined, as we don't want to lose tail pointer
*/
int flushLen = (ptr - start);
if (flushLen > 0) {
_writer.write(_outputBuffer, start, flushLen);
if (ptr >= end) {
break output_loop;
}
}
/* In any case, tail will be the new start, so hopefully
* we have room now.
*/
{
int escCode = escCodes[_outputBuffer[ptr]];
++ptr;
int needLen = (escCode < 0) ? 6 : 2;
// If not, need to call separate method (note: buffer is empty now)
if (needLen > _outputTail) {
_writeSingleEscape(escCode);
} else {
// But if it fits, can just prepend to buffer
ptr -= needLen;
_appendSingleEscape(escCode, _outputBuffer, ptr);
}
}
}
}
/**
* This method called when the string content is already in
* a char buffer, and need not be copied for processing.
*/
private void _writeString(char[] text, int offset, int len)
throws IOException, JsonGenerationException
{
/* Let's just find longest spans of non-escapable
* content, and for each see if it makes sense
* to copy them, or write through
*/
len += offset; // -> len marks the end from now on
final int[] escCodes = CharTypes.getOutputEscapes();
final int escLen = escCodes.length;
while (offset < len) {
int start = offset;
while (true) {
char c = text[offset];
if (c < escLen && escCodes[c] != 0) {
break;
}
if (++offset >= len) {
break;
}
}
// Short span? Better just copy it to buffer first:
int newAmount = offset - start;
if (newAmount < SHORT_WRITE) {
// Note: let's reserve room for escaped char (up to 6 chars)
if ((_outputTail + newAmount) > _outputEnd) {
_flushBuffer();
}
if (newAmount > 0) {
System.arraycopy(text, start, _outputBuffer, _outputTail, newAmount);
_outputTail += newAmount;
}
} else { // Nope: better just write through
_flushBuffer();
_writer.write(text, start, newAmount);
}
// Was this the end?
if (offset >= len) { // yup
break;
}
// Nope, need to escape the char.
int escCode = escCodes[text[offset]];
++offset;
int needLen = (escCode < 0) ? 6 : 2;
if ((_outputTail + needLen) > _outputEnd) {
_flushBuffer();
}
_appendSingleEscape(escCode, _outputBuffer, _outputTail);
_outputTail += needLen;
}
}
protected void _writeBinary(Base64Variant b64variant, byte[] input, int inputPtr, final int inputEnd)
throws IOException, JsonGenerationException
{
// Encoding is by chunks of 3 input, 4 output chars, so:
int safeInputEnd = inputEnd - 3;
// Let's also reserve room for possible (and quoted) lf char each round
int safeOutputEnd = _outputEnd - 6;
int chunksBeforeLF = b64variant.getMaxLineLength() >> 2;
// Ok, first we loop through all full triplets of data:
while (inputPtr <= safeInputEnd) {
if (_outputTail > safeOutputEnd) { // need to flush
_flushBuffer();
}
// First, mash 3 bytes into lsb of 32-bit int
int b24 = ((int) input[inputPtr++]) << 8;
b24 |= ((int) input[inputPtr++]) & 0xFF;
b24 = (b24 << 8) | (((int) input[inputPtr++]) & 0xFF);
_outputTail = b64variant.encodeBase64Chunk(b24, _outputBuffer, _outputTail);
if (--chunksBeforeLF <= 0) {
// note: must quote in JSON value
_outputBuffer[_outputTail++] = '\\';
_outputBuffer[_outputTail++] = 'n';
chunksBeforeLF = b64variant.getMaxLineLength() >> 2;
}
}
// And then we may have 1 or 2 leftover bytes to encode
int inputLeft = inputEnd - inputPtr; // 0, 1 or 2
if (inputLeft > 0) { // yes, but do we have room for output?
if (_outputTail > safeOutputEnd) { // don't really need 6 bytes but...
_flushBuffer();
}
int b24 = ((int) input[inputPtr++]) << 16;
if (inputLeft == 2) {
b24 |= (((int) input[inputPtr++]) & 0xFF) << 8;
}
_outputTail = b64variant.encodeBase64Partial(b24, inputLeft, _outputBuffer, _outputTail);
}
}
private final void _writeNull() throws IOException
{
if ((_outputTail + 4) >= _outputEnd) {
_flushBuffer();
}
int ptr = _outputTail;
char[] buf = _outputBuffer;
buf[ptr] = 'n';
buf[++ptr] = 'u';
buf[++ptr] = 'l';
buf[++ptr] = 'l';
_outputTail = ptr+1;
}
/**
* @param escCode Character code for escape sequence (\C); or -1
* to indicate a generic (\\uXXXX) sequence.
*/
private void _writeSingleEscape(int escCode)
throws IOException
{
char[] buf = _entityBuffer;
if (buf == null) {
buf = new char[6];
buf[0] = '\\';
buf[2] = '0';
buf[3] = '0';
}
if (escCode < 0) { // control char, value -(char + 1)
int value = -(escCode + 1);
buf[1] = 'u';
// We know it's a control char, so only the last 2 chars are non-0
buf[4] = HEX_CHARS[value >> 4];
buf[5] = HEX_CHARS[value & 0xF];
_writer.write(buf, 0, 6);
} else {
buf[1] = (char) escCode;
_writer.write(buf, 0, 2);
}
}
private void _appendSingleEscape(int escCode, char[] buf, int ptr)
{
if (escCode < 0) { // control char, value -(char + 1)
int value = -(escCode + 1);
buf[ptr] = '\\';
buf[++ptr] = 'u';
// We know it's a control char, so only the last 2 chars are non-0
buf[++ptr] = '0';
buf[++ptr] = '0';
buf[++ptr] = HEX_CHARS[value >> 4];
buf[++ptr] = HEX_CHARS[value & 0xF];
} else {
buf[ptr] = '\\';
buf[ptr+1] = (char) escCode;
}
}
protected final void _flushBuffer() throws IOException
{
int len = _outputTail - _outputHead;
if (len > 0) {
int offset = _outputHead;
_outputTail = _outputHead = 0;
_writer.write(_outputBuffer, offset, len);
}
}
}