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Ultra-high performance non-blocking XML processor (Stax/Stax2, SAX/SAX2)
/* Woodstox Lite ("wool") 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.stax;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.net.URL;
import java.nio.ByteBuffer;
import javax.xml.stream.*;
import javax.xml.stream.util.XMLEventAllocator;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamSource;
import org.codehaus.stax2.XMLEventReader2;
import org.codehaus.stax2.XMLStreamReader2;
import org.codehaus.stax2.io.Stax2ByteArraySource;
import org.codehaus.stax2.io.Stax2CharArraySource;
import org.codehaus.stax2.io.Stax2Source;
import org.codehaus.stax2.ri.Stax2FilteredStreamReader;
import org.codehaus.stax2.ri.Stax2ReaderAdapter;
import org.codehaus.stax2.ri.evt.Stax2EventReaderAdapter;
import org.codehaus.stax2.ri.evt.Stax2FilteredEventReader;
import org.xml.sax.InputSource;
import com.fasterxml.aalto.*;
import com.fasterxml.aalto.async.AsyncByteArrayScanner;
import com.fasterxml.aalto.async.AsyncByteBufferScanner;
import com.fasterxml.aalto.async.AsyncStreamReaderImpl;
import com.fasterxml.aalto.dom.DOMReaderImpl;
import com.fasterxml.aalto.evt.EventAllocatorImpl;
import com.fasterxml.aalto.evt.EventReaderImpl;
import com.fasterxml.aalto.impl.IoStreamException;
import com.fasterxml.aalto.in.*;
import com.fasterxml.aalto.util.URLUtil;
/**
* Aalto implementation of basic Stax factory (both
* {@link javax.xml.stream.XMLInputFactory} and {@link org.codehaus.stax2.XMLInputFactory2})
* as well as API for producing non-blocking (async) parsers
* (that is, {@link AsyncXMLInputFactory}).
*
* @author Tatu Saloranta
*/
public final class InputFactoryImpl
extends AsyncXMLInputFactory
{
/**
* This is the currently active configuration that will be used
* for readers created by this factory.
*/
final ReaderConfig _config;
// // // StAX - mandated objects:
protected XMLEventAllocator _allocator = null;
/*
/**********************************************************************
/* Life-cycle:
/**********************************************************************
*/
public InputFactoryImpl() {
_config = new ReaderConfig();
}
/*
/**********************************************************************
/* Stax, XMLInputFactory: filtered reader factory methods
/**********************************************************************
*/
// // // Filtered reader factory methods
@Override
public XMLEventReader createFilteredReader(XMLEventReader reader, EventFilter filter)
{
return new Stax2FilteredEventReader(Stax2EventReaderAdapter.wrapIfNecessary(reader), filter);
}
@Override
public XMLStreamReader createFilteredReader(XMLStreamReader reader, StreamFilter filter)
throws XMLStreamException
{
Stax2FilteredStreamReader fr = new Stax2FilteredStreamReader(reader, filter);
/* As per Stax 1.0 TCK, apparently the filtered
* reader is expected to be automatically forwarded to the first
* acceptable event. This is different from the way RI works, but
* since specs don't say anything about filtered readers, let's
* consider TCK to be "more formal" for now, and implement that
* behavior.
*/
if (!filter.accept(fr)) { // START_DOCUMENT ok?
// Ok, nope, this should do the trick:
fr.next();
}
return fr;
}
/*
/**********************************************************************
/* Stax, XMLInputFactory: XMLEventReader factory methods
/**********************************************************************
*/
@Override
public XMLEventReader createXMLEventReader(InputStream in) throws XMLStreamException {
return createXMLEventReader(in, null);
}
@Override
public XMLEventReader createXMLEventReader(InputStream in, String enc) throws XMLStreamException {
return constructER(constructSR(in, enc, true));
}
@Override
public XMLEventReader createXMLEventReader(Reader r) throws XMLStreamException {
return createXMLEventReader(null, r);
}
@Override
public XMLEventReader createXMLEventReader(javax.xml.transform.Source source) throws XMLStreamException {
return constructER(constructSR(source, true));
}
@Override
public XMLEventReader createXMLEventReader(String systemId, InputStream in)
throws XMLStreamException
{
return constructER(constructSR(systemId, in, true));
}
@Override
public XMLEventReader createXMLEventReader(String systemId, Reader r)
throws XMLStreamException
{
return constructER(constructSR(systemId, r, true));
}
@Override
public XMLEventReader createXMLEventReader(XMLStreamReader sr)
throws XMLStreamException
{
return constructER(Stax2ReaderAdapter.wrapIfNecessary(sr));
}
/*
/**********************************************************************
/* Stax, XMLInputFactory: XMLStreamReader factory methods
/**********************************************************************
*/
@Override
public XMLStreamReader createXMLStreamReader(InputStream in)
throws XMLStreamException
{
return constructSR(in, null, false);
}
@Override
public XMLStreamReader createXMLStreamReader(InputStream in, String enc)
throws XMLStreamException
{
return constructSR(in, enc, false);
}
@Override
public XMLStreamReader createXMLStreamReader(Reader r)
throws XMLStreamException
{
return constructSR(null, r, false);
}
@Override
public XMLStreamReader createXMLStreamReader(String systemId, Reader r)
throws XMLStreamException
{
return constructSR(systemId, r, false);
}
@Override
public XMLStreamReader createXMLStreamReader(javax.xml.transform.Source src)
throws XMLStreamException
{
return constructSR(src, false);
}
@Override
public XMLStreamReader createXMLStreamReader(String systemId, InputStream in)
throws XMLStreamException
{
return constructSR(systemId, in, false);
}
/*
/**********************************************************************
/* Stax, XMLInputFactory; generic accessors/mutators
/**********************************************************************
*/
@Override
public Object getProperty(String name)
{
// false -> is mandatory, unrecognized will throw IllegalArgumentException
return _config.getProperty(name, true);
}
@Override
public void setProperty(String propName, Object value)
{
_config.setProperty(propName, value);
}
@Override
public XMLEventAllocator getEventAllocator() {
return _allocator;
}
@Override
public XMLReporter getXMLReporter() {
return _config.getXMLReporter();
}
@Override
public XMLResolver getXMLResolver() {
return _config.getXMLResolver();
}
@Override
public boolean isPropertySupported(String name) {
return _config.isPropertySupported(name);
}
@Override
public void setEventAllocator(XMLEventAllocator allocator) {
_allocator = allocator;
}
@Override
public void setXMLReporter(XMLReporter r) {
_config.setXMLReporter(r);
}
@Override
public void setXMLResolver(XMLResolver r) {
_config.setXMLResolver(r);
}
/*
/**********************************************************************
/* Stax2 implementation; additional factory methods
/**********************************************************************
*/
@Override
public XMLEventReader2 createXMLEventReader(URL src)
throws XMLStreamException
{
return constructER(constructSR(src, true));
}
@Override
public XMLEventReader2 createXMLEventReader(File f)
throws XMLStreamException
{
return constructER(constructSR(f, true));
}
@Override
public XMLStreamReader2 createXMLStreamReader(URL src)
throws XMLStreamException
{
return constructSR(src, false);
}
/**
* Convenience factory method that allows for parsing a document
* stored in the specified file.
*/
@Override
public XMLStreamReader2 createXMLStreamReader(File f)
throws XMLStreamException
{
return constructSR(f, false);
}
// // // StAX2 "Profile" mutators
@Override
public void configureForXmlConformance()
{
_config.configureForXmlConformance();
}
@Override
public void configureForConvenience()
{
_config.configureForConvenience();
}
@Override
public void configureForSpeed()
{
_config.configureForSpeed();
}
@Override
public void configureForLowMemUsage()
{
_config.configureForLowMemUsage();
}
@Override
public void configureForRoundTripping()
{
_config.configureForRoundTripping();
}
/*
/**********************************************************************
/* Non-blocking reader factories (AsyncXMLInputFactory)
/**********************************************************************
*/
@Override
public AsyncXMLStreamReader createAsyncForByteArray()
{
// TODO: pass system and/or public ids?
ReaderConfig cfg = getNonSharedConfig(null, null, null, false, false);
cfg.setActualEncoding("UTF-8");
return new AsyncStreamReaderImpl(new AsyncByteArrayScanner(cfg));
}
@Override
public AsyncXMLStreamReader createAsyncFor(byte[] input) throws XMLStreamException
{
return createAsyncFor(input, 0, input.length);
}
@Override
public AsyncXMLStreamReader createAsyncFor(byte[] input, int offset, int length)
throws XMLStreamException
{
ReaderConfig cfg = getNonSharedConfig(null, null, null, false, false);
cfg.setActualEncoding("UTF-8");
AsyncByteArrayScanner scanner = new AsyncByteArrayScanner(cfg);
scanner.feedInput(input, offset, length);
return new AsyncStreamReaderImpl(scanner);
}
@Override
public AsyncXMLStreamReader createAsyncForByteBuffer() {
ReaderConfig cfg = getNonSharedConfig(null, null, null, false, false);
cfg.setActualEncoding("UTF-8");
return new AsyncStreamReaderImpl(new AsyncByteBufferScanner(cfg));
}
@Override
public AsyncXMLStreamReader createAsyncFor(ByteBuffer input) throws XMLStreamException
{
ReaderConfig cfg = getNonSharedConfig(null, null, null, false, false);
cfg.setActualEncoding("UTF-8");
AsyncByteBufferScanner scanner = new AsyncByteBufferScanner(cfg);
scanner.feedInput(input);
return new AsyncStreamReaderImpl(scanner);
}
/*
/**********************************************************************
/* Internal/package methods
/**********************************************************************
*/
/**
* Method called when a non-shared copy of the current configuration
* is needed. This is usually done when a new reader is constructed.
*/
public ReaderConfig getNonSharedConfig(String systemId, String publicId,
String extEncoding, boolean forEventReader, boolean forceAutoClose)
{
ReaderConfig cfg = _config.createNonShared(publicId, systemId, extEncoding);
if (forEventReader) {
/* No point in lazy parsing for event readers: no more efficient
* (and possible less) since all data is needed, always; and
* exceptions also get lazily thrown after the fact.
*/
cfg.doParseLazily(false);
}
if (forceAutoClose) {
cfg.doAutoCloseInput(true);
}
return cfg;
}
protected XMLStreamReader2 constructSR(InputStream in, String enc,
boolean forEventReader)
throws XMLStreamException
{
ReaderConfig cfg = getNonSharedConfig(null, null, enc, forEventReader, false);
return StreamReaderImpl.construct(ByteSourceBootstrapper.construct(cfg, in));
}
protected XMLStreamReader2 constructSR(String systemId, Reader r,
boolean forEventReader)
throws XMLStreamException
{
ReaderConfig cfg = getNonSharedConfig(null, systemId, null, forEventReader, false);
return StreamReaderImpl.construct(CharSourceBootstrapper.construct(cfg, r));
}
protected XMLStreamReader2 constructSR(String systemId, InputStream in,
boolean forEventReader)
throws XMLStreamException
{
ReaderConfig cfg = getNonSharedConfig(null, systemId, null, forEventReader, false);
return StreamReaderImpl.construct(ByteSourceBootstrapper.construct(cfg, in));
}
@SuppressWarnings("resource")
protected XMLStreamReader2 constructSR(javax.xml.transform.Source src,
boolean forEventReader)
throws XMLStreamException
{
if (src instanceof Stax2Source) {
return constructSR2((Stax2Source) src, forEventReader);
}
Reader r = null;
InputStream in = null;
String pubId = null;
String sysId = null;
String encoding = null;
boolean autoCloseInput;
if (src instanceof StreamSource) {
StreamSource ss = (StreamSource) src;
sysId = ss.getSystemId();
pubId = ss.getPublicId();
in = ss.getInputStream();
if (in == null) {
r = ss.getReader();
}
/* Caller still has access to stream/reader (except if we only
* get system-id); no need to force auto-close here
*/
autoCloseInput = false;
} else if (src instanceof SAXSource) {
SAXSource ss = (SAXSource) src;
// Not a complete implementation, but maybe it's enough?
sysId = ss.getSystemId();
InputSource isrc = ss.getInputSource();
if (isrc != null) {
sysId = isrc.getSystemId();
pubId = isrc.getPublicId();
encoding = isrc.getEncoding();
in = isrc.getByteStream();
if (in == null) {
r = isrc.getCharacterStream();
}
}
/* Caller still has access to stream/reader (except if we only
* get system-id); no need to force auto-close here
*/
autoCloseInput = false;
} else if (src instanceof DOMSource) {
autoCloseInput = false; // shouldn't matter
ReaderConfig cfg = getNonSharedConfig(pubId, sysId, encoding, forEventReader, autoCloseInput);
return DOMReaderImpl.createFrom((DOMSource) src, cfg);
} else {
throw new IllegalArgumentException("Can not instantiate StAX reader for XML source type "+src.getClass()+" (unrecognized type)");
}
if (in != null) {
ReaderConfig cfg = getNonSharedConfig(pubId, sysId, encoding, forEventReader, autoCloseInput);
return StreamReaderImpl.construct(ByteSourceBootstrapper.construct(cfg, in));
}
if (r != null) {
ReaderConfig cfg = getNonSharedConfig(pubId, sysId, encoding, forEventReader, autoCloseInput);
return StreamReaderImpl.construct(CharSourceBootstrapper.construct(cfg, r));
}
if (sysId != null && sysId.length() > 0) {
/* If we must construct URL from system id, caller will not have
* access to resulting stream, need to force auto-closing.
*/
autoCloseInput = true;
ReaderConfig cfg = getNonSharedConfig(pubId, sysId, encoding, forEventReader, autoCloseInput);
try {
URL url = URLUtil.urlFromSystemId(sysId);
in = URLUtil.inputStreamFromURL(url);
return StreamReaderImpl.construct(ByteSourceBootstrapper.construct(cfg, in));
} catch (IOException ioe) {
throw new IoStreamException(ioe);
}
}
throw new XMLStreamException("Can not create Stax reader for the Source passed -- neither reader, input stream nor system id was accessible; can not use other types of sources (like embedded SAX streams)");
}
protected XMLStreamReader2 constructSR2(Stax2Source ss, boolean forEventReader)
throws XMLStreamException
{
/* Caller has no access to these input sources, so we must force
* auto-close ('true' after 'forEventReader')
*/
ReaderConfig cfg = getNonSharedConfig(ss.getPublicId(), ss.getSystemId(), ss.getEncoding(), forEventReader, true);
// Byte arrays can be accessed VERY efficiently...
if (ss instanceof Stax2ByteArraySource) {
Stax2ByteArraySource bs = (Stax2ByteArraySource) ss;
return StreamReaderImpl.construct(ByteSourceBootstrapper.construct
(cfg, bs.getBuffer(), bs.getBufferStart(), bs.getBufferLength()));
}
if (ss instanceof Stax2CharArraySource) {
Stax2CharArraySource cs = (Stax2CharArraySource) ss;
return StreamReaderImpl.construct(CharSourceBootstrapper.construct
(cfg, cs.getBuffer(), cs.getBufferStart(), cs.getBufferLength()));
}
/* Ok, and this is the default, if we don't know a better
* type-specific method:
*/
try {
InputStream in = ss.constructInputStream();
if (in != null) {
return StreamReaderImpl.construct(ByteSourceBootstrapper.construct(cfg, in));
}
Reader r = ss.constructReader();
if (r != null) {
return StreamReaderImpl.construct(CharSourceBootstrapper.construct(cfg, r));
}
} catch (IOException ioe) {
throw new IoStreamException(ioe);
}
throw new IllegalArgumentException("Can not create stream reader for given Stax2Source: neither InputStream nor Reader available");
}
protected XMLStreamReader2 constructSR(URL src, boolean forEventReader)
throws XMLStreamException
{
InputStream in;
try {
in = URLUtil.inputStreamFromURL(src);
} catch (IOException ioe) {
throw new IoStreamException(ioe);
}
// Construct from URL? Must auto-close:
ReaderConfig cfg = getNonSharedConfig(URLUtil.urlToSystemId(src), null, null, forEventReader, true);
return StreamReaderImpl.construct(ByteSourceBootstrapper.construct(cfg, in));
}
protected XMLStreamReader2 constructSR(File f, boolean forEventReader)
throws XMLStreamException
{
try {
InputStream in = new FileInputStream(f);
String systemId = URLUtil.fileToSystemId(f);
// Construct from File? Must auto-close:
ReaderConfig cfg = getNonSharedConfig(systemId, null, null, forEventReader, true);
return StreamReaderImpl.construct(ByteSourceBootstrapper.construct(cfg, in));
} catch (IOException ioe) {
throw new IoStreamException(ioe);
}
}
public XMLEventReader2 constructER(XMLStreamReader2 sr) {
return new EventReaderImpl(createEventAllocator(), sr);
}
protected XMLEventAllocator createEventAllocator()
{
// Explicitly set allocate?
if (_allocator != null) {
return _allocator.newInstance();
}
// Complete or fast one?
return _config.willPreserveLocation() ?
EventAllocatorImpl.getDefaultInstance()
: EventAllocatorImpl.getFastInstance();
}
}