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Ultra-high performance non-blocking XML processor (Stax/Stax2, SAX/SAX2)
/* Aalto XML processor
*
* Copyright (c) 2006- Tatu Saloranta, [email protected]
*
* Licensed under the License specified in the file LICENSE which is
* included with the source code.
* You may not use this file except in compliance with the License.
*
* 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 com.fasterxml.aalto.out;
import java.io.*;
import javax.xml.stream.*;
import org.codehaus.stax2.ri.typed.AsciiValueEncoder;
import com.fasterxml.aalto.impl.ErrorConsts;
import com.fasterxml.aalto.io.UTF8Writer;
import com.fasterxml.aalto.util.XmlCharTypes;
import static com.fasterxml.aalto.out.OutputCharTypes.*;
/**
* This is the generic implementation of {@link XmlWriter}, used if
* the destination is a character based, like a {@link java.io.Writer}.
*/
public final class CharXmlWriter
extends XmlWriter
{
/**
* This value determines a threshold to choose how much data do
* we want to buffer at minimum, before output. This is done since
* actual underlying writer may have significant per-call overhead,
* and if so, it is much cheaper to coalesce content. But on the other
* hand, this extra buffering has overhead of its own, so we'll try
* to find a sweet spot.
*/
final static int DEFAULT_SMALL_SIZE = 200;
/**
* And this value determines size of the intermediate copy buffer
* to use.
*/
final static int DEFAULT_FULL_BUFFER_SIZE = 1000;
/*
////////////////////////////////////////////////
// Output state, buffering
////////////////////////////////////////////////
*/
/**
* This is the threshold used to check what is considered a "small"
* write; small writes will be buffered until resulting size will
* be above the threshold.
*/
protected final int mSmallWriteSize;
/**
* Actual Writer to use for outputting buffered data as appropriate.
* During active usage, remains as the writer initially set; set to
* null when this writer is closed.
*/
protected Writer _out;
protected char[] _outputBuffer;
protected int _outputPtr;
protected final int _outputBufferLen;
/*
////////////////////////////////////////////////
// Encoding/escaping configuration
////////////////////////////////////////////////
*/
/**
* First Unicode character (one with lowest value) after (and including)
* which character entities have to be used.
*/
private final int mEncHighChar;
/**
* First Unicode character that is NOT to be checked against static
* validity table. Usually the size of check table, but lower for
* some encodings (like ascii)
*/
private final int mTableCheckEnd;
/*
////////////////////////////////////////////////
// Validation
////////////////////////////////////////////////
*/
/**
* Validation tables used for verifying validity (and need for quoting)
*/
final XmlCharTypes mCharTypes;
/*
////////////////////////////////////////////////
// Life-cycle
////////////////////////////////////////////////
*/
public CharXmlWriter(WriterConfig cfg, Writer out)
{
super(cfg);
_out = out;
_outputBuffer = cfg.allocFullCBuffer(DEFAULT_FULL_BUFFER_SIZE);
_outputBufferLen = _outputBuffer.length;
mSmallWriteSize = DEFAULT_SMALL_SIZE;
_outputPtr = 0;
/* Note: let's actually exclude some illegal and potentially illegal
* chars from unicode-based encoders (specifically, 0xFFFE/0xFFFF
* which are illegal; and surrogates, which either need to be validated
* or combined). We can do some validity checks 'for free' (or at
* least more cheaply) this way.
*/
// But can we really handle surrogates this way?
int bitsize = guessEncodingBitSize(cfg);
//mEncHighChar = ((bitsize < 16) ? (1 << bitsize) : SURR1_FIRST);
mEncHighChar = ((bitsize < 16) ? (1 << bitsize) : 0xFFFE);
mTableCheckEnd = Math.min(256, mEncHighChar);
/* Hmmh... Latin1 is the closest match, for table checks... unless
* well, we have ascii (etc)
*/
mCharTypes = (bitsize < 8) ? OutputCharTypes.getAsciiCharTypes()
: OutputCharTypes.getLatin1CharTypes();
}
@Override
protected int getOutputPtr() {
return _outputPtr;
}
@Override
public int getHighestEncodable()
{
return mEncHighChar;
}
/*
///////////////////////////////////////////////////////
// WNameFactory implementation
///////////////////////////////////////////////////////
*/
@Override
public WName constructName(String localName) {
return new CharWName(localName);
}
@Override
public WName constructName(String prefix, String localName) {
return new CharWName(prefix, localName);
}
/*
////////////////////////////////////////////////
// Low-level (pass-through) methods
////////////////////////////////////////////////
*/
@Override
public void _releaseBuffers()
{
super._releaseBuffers();
if (_outputBuffer != null) {
_config.freeFullCBuffer(_outputBuffer);
_outputBuffer = null;
}
}
@Override
public void _closeTarget(boolean doClose) throws IOException
{
if (_out != null) { // just in case it's called multiple times
/* 27-Dec-2008, tatu: There is a good reason for adding
* the second check... but I'll be damned if I rememeber
* what exactly it was right now.
*/
if (doClose || (_out instanceof UTF8Writer)) {
_out.close();
_out = null;
}
}
}
@Override
public final void flush() throws IOException
{
if (_out != null) {
flushBuffer();
_out.flush();
}
}
@Override
public void writeRaw(char[] cbuf, int offset, int len) throws IOException
{
if (_out == null) {
return;
}
// First; is the new request small or not? If yes, needs to be buffered
if (len < mSmallWriteSize) { // yup
// Does it fit in with current buffer? If not, need to flush first
if ((_outputPtr + len) > _outputBufferLen) {
flushBuffer();
}
System.arraycopy(cbuf, offset, _outputBuffer, _outputPtr, len);
_outputPtr += len;
return;
}
// Ok, not a small request. But buffer may have existing content?
int ptr = _outputPtr;
if (ptr > 0) {
// If it's a small chunk, need to fill enough before flushing
if (ptr < mSmallWriteSize) {
/* Also, if we are to copy any stuff, let's make sure
* that we either copy it all in one chunk, or copy
* enough for non-small chunk, flush, and output remaining
* non-small chink (former possible if chunk we were requested
* to output is only slightly over 'small' size)
*/
int needed = (mSmallWriteSize - ptr);
// Just need minimal copy:
System.arraycopy(cbuf, offset, _outputBuffer, ptr, needed);
_outputPtr = ptr + needed;
len -= needed;
offset += needed;
}
flushBuffer();
}
// And then we'll just write whatever we have left:
_out.write(cbuf, offset, len);
}
@Override
public void writeRaw(String str, int offset, int len) throws IOException
{
if (_out == null) {
return;
}
// First; is the new request small or not? If yes, needs to be buffered
if (len < mSmallWriteSize) { // yup
// Does it fit in with current buffer? If not, need to flush first
if ((_outputPtr + len) >= _outputBufferLen) {
flushBuffer();
}
str.getChars(offset, offset+len, _outputBuffer, _outputPtr);
_outputPtr += len;
return;
}
// Ok, not a small request. But buffer may have existing content?
int ptr = _outputPtr;
if (ptr > 0) {
// If it's a small chunk, need to fill enough before flushing
if (ptr < mSmallWriteSize) {
/* Also, if we are to copy any stuff, let's make sure
* that we either copy it all in one chunk, or copy
* enough for non-small chunk, flush, and output remaining
* non-small chunk (former possible if chunk we were requested
* to output is only slightly over 'small' size)
*/
int needed = (mSmallWriteSize - ptr);
// Just need minimal copy:
str.getChars(offset, offset+needed, _outputBuffer, ptr);
_outputPtr = ptr + needed;
len -= needed;
offset += needed;
}
flushBuffer();
}
// And then we'll just write whatever we have left:
_out.write(str, offset, len);
}
/*
////////////////////////////////////////////////
// "Trusted" low-level output methods
////////////////////////////////////////////////
*/
public final void writeCDataStart()
throws IOException
{
fastWriteRaw("");
}
public final void writeCommentStart()
throws IOException
{
fastWriteRaw("");
}
/*
////////////////////////////////////////////////
// Higher-level output methods, text output
////////////////////////////////////////////////
*/
/**
* @return -1 to indicate succesful write, or index of the problematic
* character in input (first ']' from "]]>" sequence, in non-fixing
* mode)
*/
@Override
public int writeCData(String data)
throws IOException, XMLStreamException
{
writeCDataStart();
/* Ok, let's just copy into a temporary buffer. While copying
* to the output buffer would be faster, it gets pretty
* complicated; so let's not bother (yet?)
*/
int len = data.length();
int offset = 0;
while (len > 0) {
char[] buf = _copyBuffer;
final int blen = buf.length;
int len2 = (len < blen) ? len : blen;
data.getChars(offset, offset+len2, buf, 0);
int cix = writeCDataContents(buf, 0, len2);
if (cix >= 0) {
return (offset + cix);
}
offset += len2;
len -= len2;
}
writeCDataEnd();
return -1;
}
@Override
public int writeCData(char[] cbuf, int offset, int len)
throws IOException, XMLStreamException
{
writeCDataStart();
int ix = writeCDataContents(cbuf, offset, len);
if (ix < 0) { // means it went ok, so can close
writeCDataEnd();
}
return -1;
}
private int writeCDataContents(char[] cbuf, int offset, int len)
throws IOException, XMLStreamException
{
len += offset;
final int start = offset;
main_loop:
while (offset < len) {
final int[] charTypes = mCharTypes.OTHER_CHARS;
final int limit = mTableCheckEnd;
inner_loop:
while (true) {
char ch = cbuf[offset];
if (ch >= limit) {
break inner_loop;
}
if (charTypes[ch] != XmlCharTypes.CT_OK) {
break;
}
if (_outputPtr >= _outputBufferLen) {
flushBuffer();
}
_outputBuffer[_outputPtr++] = ch;
if (++offset >= len) {
break main_loop;
}
}
// Ok, so what did we hit?
int ch = (int) cbuf[offset++];
if (ch < limit) {
switch (charTypes[ch]) {
case CT_INVALID:
reportInvalidChar(ch);
case CT_WS_CR:
case CT_WS_LF: // !!! TBI: line count
break;
case CT_OUTPUT_MUST_QUOTE:
reportFailedEscaping("CDATA block", ch);
case CT_GT: // part of "]]>"?
if ((offset - start) >= 3 && cbuf[offset-2] == ']'
&& cbuf[offset-3] == ']') {
--offset; // let's push it back
// And restart CDATA block...
writeCDataEnd();
writeCDataStart();
}
break;
}
} else {
// Problem if it's out of range (like 8-bit char for ascii)
if (ch >= mEncHighChar) { // problem!
reportFailedEscaping("CDATA block", ch);
}
}
if (_outputPtr >= _outputBufferLen) {
flushBuffer();
}
_outputBuffer[_outputPtr++] = (char) ch;
}
return -1;
}
@Override
public void writeCharacters(String text)
throws IOException, XMLStreamException
{
if (_out == null) {
return;
}
int len = text.length();
int offset = 0;
while (len > 0) {
char[] buf = _copyBuffer;
final int blen = buf.length;
int len2 = (len < blen) ? len : blen;
text.getChars(offset, offset+len2, buf, 0);
writeCharacters(buf, 0, len2);
offset += len2;
len -= len2;
}
}
@Override
public void writeCharacters(char[] cbuf, int offset, int len)
throws IOException, XMLStreamException
{
if (_out == null) {
return;
}
len += offset; // will now mark the end, not length
main_loop:
while (offset < len) {
final int[] charTypes = mCharTypes.TEXT_CHARS;
final int limit = mTableCheckEnd;
inner_loop:
while (true) {
char ch = cbuf[offset];
if (ch >= limit) {
break inner_loop;
}
if (charTypes[ch] != XmlCharTypes.CT_OK) {
break;
}
if (_outputPtr >= _outputBufferLen) {
flushBuffer();
}
_outputBuffer[_outputPtr++] = ch;
if (++offset >= len) {
break main_loop;
}
}
// Ok, so what did we hit?
int ch = (int) cbuf[offset++];
if (ch < limit) {
switch (charTypes[ch]) {
case CT_INVALID:
reportInvalidChar(ch);
case CT_RBRACKET: // may need to quote as well...
// Let's not quote if known not to be followed by '>'
if (offset < len && cbuf[offset] != '>') {
break;
}
// let's fall down, to quote
case CT_OUTPUT_MUST_QUOTE:
case CT_LT:
case CT_AMP:
writeAsEntity(ch);
continue main_loop;
case CT_WS_CR:
// !!! TBI: line count
// Also, CR to be quoted?
if (_config.willEscapeCR()) {
writeAsEntity(ch);
continue main_loop;
}
break;
case CT_WS_LF:
// !!! TBI: line count
default:
break;
}
} else if (ch >= mEncHighChar) {
writeAsEntity(ch);
continue main_loop;
}
if (_outputPtr >= _outputBufferLen) {
flushBuffer();
}
_outputBuffer[_outputPtr++] = (char) ch;
}
}
@Override
public void writeSpace(String data)
throws IOException, XMLStreamException
{
if (_out == null) {
return;
}
int len = data.length();
int offset = 0;
// !!! TODO: could just copy straight to output buffer
while (len > 0) {
char[] buf = _copyBuffer;
final int blen = buf.length;
int len2 = (len < blen) ? len : blen;
data.getChars(offset, offset+len2, buf, 0);
writeSpace(buf, 0, len2);
offset += len2;
len -= len2;
}
}
@Override
public void writeSpace(char[] cbuf, int offset, int len)
throws IOException, XMLStreamException
{
if (_out == null) {
return;
}
len += offset; // will now mark the end, not length
while (offset < len) {
char ch = cbuf[offset++];
if (ch > 0x0020) {
if (!_config.isXml11() || (ch != 0x0085 && ch != 0x2028)) {
reportNwfContent(ErrorConsts.WERR_SPACE_CONTENT, (int)ch, offset-1);
}
}
if (_outputPtr >= _outputBufferLen) {
flushBuffer();
}
_outputBuffer[_outputPtr++] = ch;
}
}
/**
* Method that will try to output the content as specified. If
* the content passed in has embedded "--" in it, it will either
* add an intervening space between consequtive hyphens (if content
* fixing is enabled), or return the offset of the first hyphen in
* multi-hyphen sequence.
*/
@Override
public int writeComment(String data)
throws IOException, XMLStreamException
{
if (_out == null) {
return -1;
}
writeCommentStart();
/* Ok, let's just copy into a temporary buffer. While copying
* to the output buffer would be faster, it gets pretty
* complicated; so let's not bother (yet?)
*/
int len = data.length();
int offset = 0;
int cix = -1;
while (len > 0) {
char[] buf = _copyBuffer;
int blen = buf.length;
// Can write all the rest?
if (blen > len) {
blen = len;
}
// Nope, can only do part
data.getChars(offset, offset+blen, buf, 0);
cix = writeCommentContents(buf, 0, blen, false);
if (cix >= 0) {
break;
}
offset += blen;
len -= blen;
}
if (cix >= 0) {
return (offset + cix);
}
writeCommentEnd();
return -1;
}
/**
* Note: the only way to fix comment contents is to inject a space
* to split up consequtive '--' (or '-' that ends a comment).
*/
private int writeCommentContents(char[] cbuf, int offset, int len,
boolean last)
throws IOException, XMLStreamException
{
len += offset;
main_loop:
while (offset < len) {
final int[] charTypes = mCharTypes.OTHER_CHARS;
final int limit = mTableCheckEnd;
inner_loop:
while (true) {
char ch = cbuf[offset];
if (ch >= limit) {
break inner_loop;
}
if (charTypes[ch] != XmlCharTypes.CT_OK) {
break;
}
if (_outputPtr >= _outputBufferLen) {
flushBuffer();
}
_outputBuffer[_outputPtr++] = ch;
if (++offset >= len) {
break main_loop;
}
}
// Ok, so what did we hit?
int ch = (int) cbuf[offset++];
if (ch < limit) {
switch (charTypes[ch]) {
case CT_INVALID:
reportInvalidChar(ch);
case CT_WS_CR:
case CT_WS_LF: // !!! TBI: line count
break;
case CT_OUTPUT_MUST_QUOTE:
reportFailedEscaping("comment", ch);
case CT_HYPHEN: // part of "--", or last char "-"?
/* If so, must be able to fix by appending an
* extra space...
*/
if (offset == len || cbuf[offset] == '-') {
if (!_config.willFixContent()) {
return offset-1; // points to the 'offending' char
}
if (_outputPtr >= _outputBufferLen) {
flushBuffer();
}
_outputBuffer[_outputPtr++] = ' ';
}
break;
}
} else {
// Problem if it's out of range (like 8-bit char for ascii)
if (ch >= mEncHighChar) { // problem!
reportFailedEscaping("comment", ch);
}
}
if (_outputPtr >= _outputBufferLen) {
flushBuffer();
}
_outputBuffer[_outputPtr++] = (char) ch;
}
return -1;
}
@Override
public void writeDTD(String data)
throws IOException, XMLStreamException
{
// !!! TBI: Check for char validity, similar to other methods?
writeRaw(data, 0, data.length());
}
@Override
public void writeDTD(WName rootName, String systemId, String publicId,
String internalSubset)
throws IOException, XMLStreamException
{
fastWriteRaw(" 0) {
fastWriteRaw(' ', '[');
// !!! TBI: verify validity
fastWriteRaw(internalSubset);
fastWriteRaw(']');
}
fastWriteRaw('>');
}
@Override
public void writeEntityReference(WName name)
throws IOException, XMLStreamException
{
fastWriteRaw('&');
writeName(name);
fastWriteRaw(';');
}
@Override
public void writeXmlDeclaration(String version, String encoding, String standalone)
throws IOException, XMLStreamException
{
fastWriteRaw(" 0) {
fastWriteRaw(" encoding='");
// !!! TBI: check validity
fastWriteRaw(encoding);
fastWriteRaw('\'');
}
if (standalone != null) {
fastWriteRaw(" standalone='");
// !!! TBI: check validity
fastWriteRaw(standalone);
fastWriteRaw('\'');
}
fastWriteRaw('?', '>');
}
@Override
public int writePI(WName target, String data)
throws IOException, XMLStreamException
{
fastWriteRaw('<', '?');
writeName(target);
if (data != null && data.length() > 0) {
int len = data.length();
int offset = 0;
int cix = -1;
fastWriteRaw(' ');
// !!! TODO: copy straight to output buffer
while (len > 0) {
char[] buf = _copyBuffer;
int blen = buf.length;
// Can write all the rest?
if (blen > len) {
blen = len;
}
data.getChars(offset, offset+blen, buf, 0);
cix = writePIContents(buf, 0, blen);
if (cix >= 0) {
break;
}
offset += blen;
len -= blen;
}
if (cix >= 0) {
return offset + cix;
}
}
fastWriteRaw('?', '>');
return -1;
}
private int writePIContents(char[] cbuf, int offset, int len)
throws IOException, XMLStreamException
{
len += offset;
main_loop:
while (offset < len) {
final int[] charTypes = mCharTypes.OTHER_CHARS;
final int limit = mTableCheckEnd;
inner_loop:
while (true) {
char ch = cbuf[offset];
if (ch >= limit) {
break inner_loop;
}
if (charTypes[ch] != XmlCharTypes.CT_OK) {
break;
}
if (_outputPtr >= _outputBufferLen) {
flushBuffer();
}
_outputBuffer[_outputPtr++] = ch;
if (++offset >= len) {
break main_loop;
}
}
// Ok, so what did we hit?
int ch = (int) cbuf[offset++];
if (ch < limit) {
switch (charTypes[ch]) {
case CT_INVALID:
reportInvalidChar(ch);
case CT_WS_CR:
case CT_WS_LF: // !!! TBI: line count
break;
case CT_OUTPUT_MUST_QUOTE:
reportFailedEscaping("processing instruction", ch);
case CT_QMARK: // part of "?>"?
if (offset < len && cbuf[offset] == '>') { // no way to fix, alas
return offset;
}
break;
}
} else {
// Problem if it's out of range (like 8-bit char for ascii)
if (ch >= mEncHighChar) { // problem!
reportFailedEscaping("processing instruction", ch);
}
}
if (_outputPtr >= _outputBufferLen) {
flushBuffer();
}
_outputBuffer[_outputPtr++] = (char) ch;
}
return -1;
}
/*
////////////////////////////////////////////////////
// Write methods, elements
////////////////////////////////////////////////////
*/
@Override
public void writeStartTagStart(WName name)
throws IOException, XMLStreamException
{
int ptr = _outputPtr;
int len = name.serializedLength();
if ((ptr + len + 1) > _outputBufferLen) {
if (_out == null) {
return;
}
flushBuffer();
// Very unlikely, but possible:
if (len >= _outputBufferLen) {
_out.write('<');
name.writeChars(_out);
return;
}
ptr = _outputPtr;
}
char[] buf = _outputBuffer;
buf[ptr++] = '<';
name.appendChars(buf, ptr);
_outputPtr = ptr + len;
}
@Override
public void writeStartTagEnd()
throws IOException, XMLStreamException
{
fastWriteRaw('>');
}
@Override
public void writeStartTagEmptyEnd()
throws IOException
{
int ptr = _outputPtr;
if ((ptr + 2) > _outputBufferLen) {
if (_out == null) {
return;
}
flushBuffer();
ptr = _outputPtr;
}
char[] buf = _outputBuffer;
buf[ptr++] = '/';
buf[ptr++] = '>';
_outputPtr = ptr;
}
@Override
public void writeEndTag(WName name)
throws IOException, XMLStreamException
{
int ptr = _outputPtr;
int len = name.serializedLength();
if ((ptr + len + 3) > _outputBufferLen) {
flushBuffer();
// name longer than the buffer? can write it straight out
if ((len + 3) > _outputBufferLen) {
_out.write('<');
_out.write('/');
name.writeChars(_out);
_outputBuffer[_outputPtr++] = '>';
return;
}
ptr = _outputPtr;
}
char[] buf = _outputBuffer;
buf[ptr++] = '<';
buf[ptr++] = '/';
name.appendChars(buf, ptr);
ptr += len;
buf[ptr++] = '>';
_outputPtr = ptr;
}
/*
////////////////////////////////////////////////////
// Write methods, attributes/ns
////////////////////////////////////////////////////
*/
@Override
public void writeAttribute(WName name, String value)
throws IOException, XMLStreamException
{
if (_out == null) {
return;
}
fastWriteRaw(' ');
writeName(name);
fastWriteRaw('=', '"');
int len = (value == null) ? 0 : value.length();
if (len > 0) {
writeAttrValue(value, len);
}
fastWriteRaw('"');
}
@Override
public void writeAttribute(WName name, char[] value, int offset, int vlen)
throws IOException, XMLStreamException
{
if (_out == null) {
return;
}
fastWriteRaw(' ');
writeName(name);
fastWriteRaw('=', '"');
if (vlen > 0) {
writeAttrValue(value, offset, vlen);
}
fastWriteRaw('"');
}
private final void writeAttrValue(String value, int len)
throws IOException, XMLStreamException
{
int offset = 0;
while (len > 0) {
char[] buf = _copyBuffer;
final int blen = buf.length;
int len2 = (len < blen) ? len : blen;
value.getChars(offset, offset+len2, buf, 0);
writeAttrValue(buf, 0, len2);
offset += len2;
len -= len2;
}
}
private final void writeAttrValue(char[] cbuf, int offset, int len)
throws IOException, XMLStreamException
{
if (_out == null) {
return;
}
// Fast or slow?
if ((_outputPtr + len) > _outputBufferLen) { // slow
writeSplitAttrValue(cbuf, offset, len);
return;
}
// Nope, fast loop:
len += offset; // will now mark the end, not length
main_loop:
while (offset < len) {
final int[] charTypes = mCharTypes.ATTR_CHARS;
final int limit = mTableCheckEnd;
inner_loop:
while (true) {
char ch = cbuf[offset];
if (ch >= limit) {
break inner_loop;
}
if (charTypes[ch] != XmlCharTypes.CT_OK) {
break;
}
_outputBuffer[_outputPtr++] = ch;
if (++offset >= len) {
break main_loop;
}
}
// Ok, so what did we hit?
char ch = cbuf[offset++];
if (ch < limit) {
switch (charTypes[ch]) {
case CT_INVALID:
reportInvalidChar(ch);
case CT_OUTPUT_MUST_QUOTE:
case CT_ATTR_QUOTE:
case CT_LT:
case CT_AMP:
break;
case CT_WS_CR:
case CT_WS_LF:
// !!! TBI: line count
/* Note: Both CR and LF always needs quoting within
* attribute value; no point in disabling that.
*/
break;
default:
_outputBuffer[_outputPtr++] = ch;
continue main_loop;
}
} else if (ch < mEncHighChar) {
_outputBuffer[_outputPtr++] = ch;
continue main_loop;
}
writeAsEntity(ch);
/* Invariant regarding output buffer length might not hold
* any more? (due to escaping)
*/
if ((len - offset) >= (_outputBufferLen - _outputPtr)) {
flushBuffer();
}
}
}
private final void writeSplitAttrValue(char[] cbuf, int offset, int len)
throws IOException, XMLStreamException
{
len += offset; // will now mark the end, not length
main_loop:
while (offset < len) {
final int[] charTypes = mCharTypes.ATTR_CHARS;
final int limit = mTableCheckEnd;
inner_loop:
while (true) {
char ch = cbuf[offset];
if (ch >= limit) {
break inner_loop;
}
if (charTypes[ch] != XmlCharTypes.CT_OK) {
break;
}
if (_outputPtr >= _outputBufferLen) {
flushBuffer();
}
_outputBuffer[_outputPtr++] = ch;
if (++offset >= len) {
break main_loop;
}
}
// Ok, so what did we hit?
int ch = (int) cbuf[offset++];
if (ch < limit) {
switch (charTypes[ch]) {
case CT_INVALID:
reportInvalidChar(ch);
case CT_OUTPUT_MUST_QUOTE:
case CT_ATTR_QUOTE:
case CT_LT:
case CT_AMP:
writeAsEntity(ch);
continue main_loop;
case CT_WS_CR:
case CT_WS_LF:
// !!! TBI: line count
/* Note: Both CR and LF always needs quoting within
* attribute value; no point in disabling that.
*/
writeAsEntity(ch);
continue main_loop;
default:
break;
}
} else if (ch >= mEncHighChar) {
writeAsEntity(ch);
continue main_loop;
}
if (_outputPtr >= _outputBufferLen) {
flushBuffer();
}
_outputBuffer[_outputPtr++] = (char) ch;
}
}
/*
//////////////////////////////////////////////////
// Write methods, typed content
//////////////////////////////////////////////////
*/
@Override
public void writeTypedValue(AsciiValueEncoder enc)
throws IOException, XMLStreamException
{
int free = _outputBufferLen - _outputPtr;
if (enc.bufferNeedsFlush(free)) {
flush();
}
while (true) {
_outputPtr = enc.encodeMore(_outputBuffer, _outputPtr, _outputBufferLen);
if (enc.isCompleted()) {
break;
}
flushBuffer();
}
}
/*
////////////////////////////////////////////////////
// Write methods, attributes, Typed
////////////////////////////////////////////////////
*/
@Override
public final void writeAttribute(WName name, AsciiValueEncoder enc)
throws IOException, XMLStreamException
{
if (_out == null) {
return;
}
fastWriteRaw(' ');
writeName(name);
fastWriteRaw('=', '"');
writeTypedValue(enc);
fastWriteRaw('"');
}
/*
////////////////////////////////////////////////////
// Internal methods, buffering
////////////////////////////////////////////////////
*/
private final void flushBuffer()
throws IOException
{
if (_outputPtr > 0 && _out != null) {
int ptr = _outputPtr;
// Need to update location info, to keep it in sync
_locPastChars += ptr;
_locRowStartOffset -= ptr;
_outputPtr = 0;
_out.write(_outputBuffer, 0, ptr);
}
}
/*
////////////////////////////////////////////////////
// Internal methods, low-level write
////////////////////////////////////////////////////
*/
protected final void writeName(WName name)
throws IOException
{
int ptr = _outputPtr;
int len = name.serializedLength();
if ((ptr + len) > _outputBufferLen) {
flushBuffer();
// name longer than the buffer? can write it straight out
if (len >= _outputBufferLen) {
name.writeChars(_out);
return;
}
ptr = _outputPtr;
}
name.appendChars(_outputBuffer, ptr);
_outputPtr += len;
}
private final void fastWriteRaw(char c)
throws IOException
{
if (_outputPtr >= _outputBufferLen) {
if (_out == null) {
return;
}
flushBuffer();
}
_outputBuffer[_outputPtr++] = c;
}
private final void fastWriteRaw(char c1, char c2)
throws IOException
{
if ((_outputPtr + 1) >= _outputBufferLen) {
if (_out == null) {
return;
}
flushBuffer();
}
_outputBuffer[_outputPtr++] = c1;
_outputBuffer[_outputPtr++] = c2;
}
private final void fastWriteRaw(String str)
throws IOException
{
int len = str.length();
int ptr = _outputPtr;
if ((ptr + len) >= _outputBufferLen) {
if (_out == null) {
return;
}
/* It's even possible that String is longer than the buffer (not
* likely, possible). If so, let's just call the full
* method:
*/
if (len > _outputBufferLen) {
writeRaw(str, 0, str.length());
return;
}
flushBuffer();
ptr = _outputPtr;
}
str.getChars(0, len, _outputBuffer, ptr);
_outputPtr = ptr+len;
}
/*
////////////////////////////////////////////////////
// Internal methods, content verification/fixing
////////////////////////////////////////////////////
*/
/**
* @return Index at which a problem was found, if any; -1 if there's
* no problem.
*/
protected int verifyCDataContent(String content)
{
if (content != null && content.length() >= 3) {
int ix = content.indexOf(']');
if (ix >= 0) {
return content.indexOf("]]>", ix);
}
}
return -1;
}
protected int verifyCDataContent(char[] c, int start, int end)
{
if (c != null) {
start += 2;
/* Let's do simple optimization for search...
* (bayer-moore search algorithm)
*/
while (start < end) {
char ch = c[start];
if (ch == ']') {
++start; // let's just move by one in this case
continue;
}
if (ch == '>') { // match?
if (c[start-1] == ']'
&& c[start-2] == ']') {
return start-2;
}
}
start += 2;
}
}
return -1;
}
protected int verifyCommentContent(String content)
{
int ix = content.indexOf('-');
if (ix >= 0) {
/* actually, it's illegal to just end with '-' too, since
* that would cause invalid end marker '--->'
*/
if (ix < (content.length() - 1)) {
ix = content.indexOf("--", ix);
}
}
return ix;
}
protected void writeSegmentedCData(String content, int index)
throws IOException
{
/* It's actually fairly easy, just split "]]>" into 2 pieces;
* for each ']]>'; first one containing "]]", second one ">"
* (as long as necessary)
*/
int start = 0;
while (index >= 0) {
fastWriteRaw("");
start = index+2;
index = content.indexOf("]]>", start);
}
// Ok, then the last segment
fastWriteRaw("");
}
protected void writeSegmentedCData(char[] c, int start, int len, int index)
throws IOException
{
int end = start + len;
while (index >= 0) {
fastWriteRaw("");
start = index+2;
index = verifyCDataContent(c, start, end);
}
// Ok, then the last segment
fastWriteRaw("");
}
protected void writeSegmentedComment(String content, int index)
throws IOException
{
int len = content.length();
// First the special case (last char is hyphen):
if (index == (len-1)) {
fastWriteRaw("");
return;
}
/* Fixing comments is more difficult than that of CDATA segments';
* this because CDATA can still contain embedded ']]'s, but
* comment neither allows '--' nor ending with '-->'; which means
* that it's impossible to just split segments. Instead we'll do
* something more intrusive, and embed single spaces between all
* '--' character pairs... it's intrusive, but comments are not
* supposed to contain any data, so that should be fine (plus
* at least result is valid, unlike contents as is)
*/
fastWriteRaw("");
}
protected final void writeAsEntity(int c)
throws IOException
{
// Quickie check to avoid
char[] buf = _outputBuffer;
int ptr = _outputPtr;
if ((ptr + 10) >= buf.length) { // &#x [up to 6 hex digits] ;
flushBuffer();
ptr = _outputPtr;
}
buf[ptr++] = '&';
// Can use more optimal notation for 8-bit ascii stuff:
if (c < 256) {
/* Also; although not really mandatory, let's also
* use pre-defined entities where possible.
*/
if (c == '&') {
buf[ptr++] = 'a';
buf[ptr++] = 'm';
buf[ptr++] = 'p';
} else if (c == '<') {
buf[ptr++] = 'l';
buf[ptr++] = 't';
} else if (c == '>') {
buf[ptr++] = 'g';
buf[ptr++] = 't';
} else if (c == '\'') {
buf[ptr++] = 'a';
buf[ptr++] = 'p';
buf[ptr++] = 'o';
buf[ptr++] = 's';
} else if (c == '"') {
buf[ptr++] = 'q';
buf[ptr++] = 'u';
buf[ptr++] = 'o';
buf[ptr++] = 't';
} else {
buf[ptr++] = '#';;
buf[ptr++] = 'x';;
// Can use shortest quoting for tab, cr, lf:
if (c >= 16) {
int digit = (c >> 4);
buf[ptr++] = (char) ((digit < 10) ? ('0' + digit) : (('a' - 10) + digit));
c &= 0xF;
}
buf[ptr++] = (char) ((c < 10) ? ('0' + c) : (('a' - 10) + c));
}
} else {
buf[ptr++] = '#';
buf[ptr++] = 'x';
// Ok, let's write the shortest possible sequence then:
int shift = 20;
int origPtr = ptr;
do {
int digit = (c >> shift) & 0xF;
if (digit > 0 || (ptr != origPtr)) {
buf[ptr++] = (char) ((digit < 10) ? ('0' + digit) : (('a' - 10) + digit));
}
shift -= 4;
} while (shift > 0);
c &= 0xF;
buf[ptr++] = (char) ((c < 10) ? ('0' + c) : (('a' - 10) + c));
}
buf[ptr++] = ';';
_outputPtr = ptr;
}
}
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