src.java.com.ctc.wstx.stax.WstxInputFactory Maven / Gradle / Ivy
/* Woodstox XML processor
*
* Copyright (c) 2004- 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.ctc.wstx.stax;
import java.io.*;
import java.net.URL;
import java.util.*;
import javax.xml.stream.*;
import javax.xml.stream.util.XMLEventAllocator;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamSource;
import org.xml.sax.InputSource;
import org.codehaus.stax2.XMLEventReader2;
import org.codehaus.stax2.XMLInputFactory2;
import org.codehaus.stax2.XMLStreamReader2;
import org.codehaus.stax2.io.Stax2Source;
import com.ctc.wstx.api.ReaderConfig;
import com.ctc.wstx.api.WstxInputProperties;
import com.ctc.wstx.cfg.InputConfigFlags;
import com.ctc.wstx.cfg.XmlConsts;
import com.ctc.wstx.dtd.DTDId;
import com.ctc.wstx.dtd.DTDSubset;
import com.ctc.wstx.dom.DOMWrappingReader;
import com.ctc.wstx.evt.DefaultEventAllocator;
import com.ctc.wstx.evt.FilteredEventReader;
import com.ctc.wstx.evt.WstxEventReader;
import com.ctc.wstx.exc.WstxIOException;
import com.ctc.wstx.io.*;
import com.ctc.wstx.sr.ValidatingStreamReader;
import com.ctc.wstx.sr.ReaderCreator;
import com.ctc.wstx.util.DefaultXmlSymbolTable;
import com.ctc.wstx.util.SimpleCache;
import com.ctc.wstx.util.SymbolTable;
import com.ctc.wstx.util.TextBuilder;
import com.ctc.wstx.util.URLUtil;
/**
* Factory for creating various StAX objects (stream/event reader,
* writer).
*
*
* Currently supported configuration options fall into two categories. First,
* all properties from {@link XMLInputFactory} (such as, say,
* {@link XMLInputFactory#IS_NAMESPACE_AWARE}) are at least recognized, and
* most are supported. Second, there are additional properties, defined in
* constant class {@link WstxInputProperties}, that are supported.
* See {@link WstxInputProperties} for further explanation of these 'custom'
* properties.
*
*
* TODO:
*
* - Pass XMLResolver for readers
*
* - Try to implement reader that takes SAX events as input? (hard to do?)
*
* - Implement reader that takes DOM tree as input
*
*
*/
public class WstxInputFactory
extends XMLInputFactory2
implements ReaderCreator,
InputConfigFlags
{
/**
* Let's limit max size to 3/4 of 16k, since this corresponds
* to 64k main hash index. This should not be too low, but could
* perhaps be further lowered?
*/
final static int MAX_SYMBOL_TABLE_SIZE = 12000;
/**
* Number of generations should not matter as much as raw
* size... but let's still cap it at some number. 500 generations
* seems reasonable for flushing (note: does not count uses
* where no new symbols were added).
*/
final static int MAX_SYMBOL_TABLE_GENERATIONS = 500;
/*
/////////////////////////////////////////////////////
// Actual storage of configuration settings
/////////////////////////////////////////////////////
*/
/**
* Current configurations for this factory
*/
protected final ReaderConfig mConfig;
// // // StAX - mandated objects:
protected XMLEventAllocator mAllocator = null;
// // // Other configuration objects:
protected SimpleCache mDTDCache = null;
/*
/////////////////////////////////////////////////////
// Objects shared by actual parsers
/////////////////////////////////////////////////////
*/
/**
* 'Root' symbol table, used for creating actual symbol table instances,
* but never as is.
*/
final static SymbolTable mRootSymbols = DefaultXmlSymbolTable.getInstance();
static {
/* By default, let's enable intern()ing of names (element, attribute,
* prefixes) added to symbol table. This is likely to make some
* access (attr by QName) and comparison of element/attr names
* more efficient. Although it will add some overhead on adding
* new symbols to symbol table that should be rather negligible.
*
* Also note that always doing intern()ing allows for more efficient
* access during DTD validation.
*/
mRootSymbols.setInternStrings(true);
}
/**
* Actual current 'parent' symbol table; concrete instances will be
* created from this instance using makeChild method
*/
SymbolTable mSymbols = mRootSymbols;
/*
/////////////////////////////////////////////////////
// Life-cycle:
/////////////////////////////////////////////////////
*/
public WstxInputFactory() {
mConfig = ReaderConfig.createFullDefaults();
}
/*
/////////////////////////////////////////////////////
// ReaderCreator implementation
/////////////////////////////////////////////////////
*/
// // // Configuration access methods:
/**
* Method readers created by this factory call, if DTD caching is
* enabled, to see if an external DTD (subset) has been parsed
* and cached earlier.
*/
public synchronized DTDSubset findCachedDTD(DTDId id)
{
return (mDTDCache == null) ?
null : (DTDSubset) mDTDCache.find(id);
}
// // // Callbacks for updating shared information
/**
* Method individual parsers call to pass back symbol table that
* they updated, which may be useful for other parser to reuse, instead
* of previous base symbol table.
*
* Note: parser is only to call this method, if passed-in symbol
* table was modified, ie new entry/ies were added in addition to
* whatever was in root table.
*/
public synchronized void updateSymbolTable(SymbolTable t)
{
SymbolTable curr = mSymbols;
/* Let's only add if table was direct descendant; this prevents
* siblings from keeping overwriting settings (multiple direct
* children have additional symbols added)
*/
if (t.isDirectChildOf(curr)) {
/* 07-Apr-2006, TSa: Actually, since huge symbol tables
* might become hindrance more than benefit (either in
* pathological cases with random names; or with very
* long running processes), let's actually limit both
* number of generations, and, more imporantly, maximum
* size of the symbol table
*/
if (t.size() > MAX_SYMBOL_TABLE_SIZE ||
t.version() > MAX_SYMBOL_TABLE_GENERATIONS) {
// If so, we'll reset from bare defaults
mSymbols = mRootSymbols;
//System.err.println("DEBUG: !!!! XXXXX Symbol Table Flush: size: "+t.size()+"; version: "+t.version());
} else {
mSymbols.mergeChild(t);
//System.err.println("Debug: new symbol table: size: "+t.size()+"; version: "+t.version());
}
}
//else System.err.println("Debug: skipping symbol table update");
}
public synchronized void addCachedDTD(DTDId id, DTDSubset extSubset)
{
if (mDTDCache == null) {
mDTDCache = new SimpleCache(mConfig.getDtdCacheSize());
}
mDTDCache.add(id, extSubset);
}
/*
/////////////////////////////////////////////////////
// StAX, XMLInputFactory; factory methods
/////////////////////////////////////////////////////
*/
// // // Filtered reader factory methods
public XMLEventReader createFilteredReader(XMLEventReader reader, EventFilter filter)
{
return new FilteredEventReader(reader, filter);
}
public XMLStreamReader createFilteredReader(XMLStreamReader reader, StreamFilter filter)
throws XMLStreamException
{
FilteredStreamReader fr = new FilteredStreamReader(reader, filter);
/* [WSTX-111] 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;
}
// // // Event reader factory methods
public XMLEventReader createXMLEventReader(InputStream in)
throws XMLStreamException
{
// false for auto-close, since caller has access to the input stream
return new WstxEventReader(createEventAllocator(),
createSR(null, in, null, true, false));
}
public XMLEventReader createXMLEventReader(InputStream in, String enc)
throws XMLStreamException
{
// false for auto-close, since caller has access to the input stream
return new WstxEventReader(createEventAllocator(),
createSR(null, in, enc, true, false));
}
public XMLEventReader createXMLEventReader(Reader r)
throws XMLStreamException
{
// false for auto-close, since caller has access to the input stream
return new WstxEventReader(createEventAllocator(),
createSR(null, r, true, false));
}
public XMLEventReader createXMLEventReader(javax.xml.transform.Source source)
throws XMLStreamException
{
return new WstxEventReader(createEventAllocator(),
createSR(source, true));
}
public XMLEventReader createXMLEventReader(String systemId, InputStream in)
throws XMLStreamException
{
// false for auto-close, since caller has access to the input stream
return new WstxEventReader(createEventAllocator(),
createSR(systemId, in, null, true, false));
}
public XMLEventReader createXMLEventReader(String systemId, Reader r)
throws XMLStreamException
{
// false for auto-close, since caller has access to the reader
return new WstxEventReader(createEventAllocator(),
createSR(systemId, r, true, false));
}
public XMLEventReader createXMLEventReader(XMLStreamReader sr)
throws XMLStreamException
{
return new WstxEventReader(createEventAllocator(), sr);
}
// // // Stream reader factory methods
public XMLStreamReader createXMLStreamReader(InputStream in)
throws XMLStreamException
{
// false for auto-close, since caller has access to the input stream
return createSR(null, in, null, false, false);
}
public XMLStreamReader createXMLStreamReader(InputStream in, String enc)
throws XMLStreamException
{
// false for auto-close, since caller has access to the input stream
return createSR(null, in, enc, false, false);
}
public XMLStreamReader createXMLStreamReader(Reader r)
throws XMLStreamException
{
// false for auto-close, since caller has access to the reader
return createSR(null, r, false, false);
}
public XMLStreamReader createXMLStreamReader(javax.xml.transform.Source src)
throws XMLStreamException
{
/* true for auto-close, since caller has no (guaranteed) access to
* the underlying input stream/reader (source object may hand
* different readers for each call)
*/
return createSR(src, false);
}
public XMLStreamReader createXMLStreamReader(String systemId, InputStream in)
throws XMLStreamException
{
// false for auto-close, since caller has access to the input stream
return createSR(systemId, in, null, false, false);
}
public XMLStreamReader createXMLStreamReader(String systemId, Reader r)
throws XMLStreamException
{
// false for auto-close, since caller has access to the Reader
return createSR(systemId, r, false, false);
}
/*
/////////////////////////////////////////////////////
// StAX, XMLInputFactory; generic accessors/mutators
/////////////////////////////////////////////////////
*/
public Object getProperty(String name)
{
Object ob = mConfig.getProperty(name);
if (ob == null) {
if (name.equals(XMLInputFactory.ALLOCATOR)) {
// Event allocator not available via J2ME subset...
return getEventAllocator();
}
}
return ob;
}
public void setProperty(String propName, Object value)
{
if (!mConfig.setProperty(propName, value)) {
if (XMLInputFactory.ALLOCATOR.equals(propName)) {
setEventAllocator((XMLEventAllocator) value);
}
}
}
public XMLEventAllocator getEventAllocator() {
return mAllocator;
}
public XMLReporter getXMLReporter() {
return mConfig.getXMLReporter();
}
public XMLResolver getXMLResolver() {
return mConfig.getXMLResolver();
}
public boolean isPropertySupported(String name) {
return mConfig.isPropertySupported(name);
}
public void setEventAllocator(XMLEventAllocator allocator) {
mAllocator = allocator;
}
public void setXMLReporter(XMLReporter r) {
mConfig.setXMLReporter(r);
}
/**
* Note: it's preferable to use Wstx-specific
* {@link ReaderConfig#setEntityResolver}
* instead, if possible, since this just wraps passed in resolver.
*/
public void setXMLResolver(XMLResolver r)
{
mConfig.setXMLResolver(r);
}
/*
/////////////////////////////////////////////////////
// StAX2 implementation
/////////////////////////////////////////////////////
*/
// // // StAX2, additional factory methods:
public XMLEventReader2 createXMLEventReader(URL src)
throws XMLStreamException
{
/* true for auto-close, since caller has no access to the underlying
* input stream created from the URL
*/
return new WstxEventReader(createEventAllocator(),
createSR(createPrivateConfig(), src, true, true));
}
public XMLEventReader2 createXMLEventReader(File f)
throws XMLStreamException
{
/* true for auto-close, since caller has no access to the underlying
* input stream created from the File
*/
return new WstxEventReader(createEventAllocator(),
createSR(f, true, true));
}
public XMLStreamReader2 createXMLStreamReader(URL src)
throws XMLStreamException
{
/* true for auto-close, since caller has no access to the underlying
* input stream created from the URL
*/
return createSR(createPrivateConfig(), src, false, true);
}
/**
* Convenience factory method that allows for parsing a document
* stored in the specified file.
*/
public XMLStreamReader2 createXMLStreamReader(File f)
throws XMLStreamException
{
/* true for auto-close, since caller has no access to the underlying
* input stream created from the File
*/
return createSR(f, false, true);
}
// // // StAX2 "Profile" mutators
public void configureForXmlConformance()
{
mConfig.configureForXmlConformance();
}
public void configureForConvenience()
{
mConfig.configureForConvenience();
}
public void configureForSpeed()
{
mConfig.configureForSpeed();
}
public void configureForLowMemUsage()
{
mConfig.configureForLowMemUsage();
}
public void configureForRoundTripping()
{
mConfig.configureForRoundTripping();
}
/*
/////////////////////////////////////////
// Woodstox-specific configuration access
/////////////////////////////////////////
*/
public ReaderConfig getConfig() {
return mConfig;
}
/*
/////////////////////////////////////////////////////
// Internal methods:
/////////////////////////////////////////////////////
*/
/**
* Bottleneck method used for creating ALL full stream reader instances
* (via other createSR() methods and directly)
*
* @param forER True, if the reader is being constructed to be used
* by an event reader; false if it is not (or the purpose is not
* known)
* @param autoCloseInput Whether the underlying input source should be
* actually closed when encountering EOF, or when close()
* is called. Will be true for input sources that are automatically
* managed by stream reader (input streams created for
* {@link java.net.URL} and {@link java.io.File} arguments, or when
* configuration settings indicate auto-closing is to be enabled
* (the default value is false as per Stax 1.0 specs).
*/
private XMLStreamReader2 doCreateSR(ReaderConfig cfg, String systemId, InputBootstrapper bs,
URL src, boolean forER,
boolean autoCloseInput)
throws XMLStreamException
{
/* Automatic closing of input: will happen always for some input
* types (ones application has no direct access to; but can also
* be explicitly enabled.
*/
if (!autoCloseInput) {
autoCloseInput = cfg.willAutoCloseInput();
}
Reader r;
try {
r = bs.bootstrapInput(cfg, true, XmlConsts.XML_V_UNKNOWN);
if (bs.declaredXml11()) {
cfg.enableXml11(true);
}
} catch (IOException ie) {
throw new WstxIOException(ie);
}
/* null -> no public id available
* false -> don't close the reader when scope is closed.
*/
BranchingReaderSource input = InputSourceFactory.constructDocumentSource
(cfg, bs, null, systemId, src, r, autoCloseInput);
try {
ValidatingStreamReader sr = ValidatingStreamReader.createValidatingStreamReader
(input, this, cfg, bs, forER);
return sr;
} catch (IOException ie) {
throw new WstxIOException(ie);
}
}
/**
* Method that is eventually called to create a (full) stream read
* instance.
*
* Note: defined as public method because it needs to be called by
* SAX implementation.
*
* @param systemId System id used for this reader (if any)
* @param bs Bootstrapper to use for creating actual underlying
* physical reader
* @param forER Flag to indicate whether it will be used via
* Event API (will affect some configuration settings), true if it
* will be, false if not (or not known)
* @param autoCloseInput Whether the underlying input source should be
* actually closed when encountering EOF, or when close()
* is called. Will be true for input sources that are automatically
* managed by stream reader (input streams created for
* {@link java.net.URL} and {@link java.io.File} arguments, or when
* configuration settings indicate auto-closing is to be enabled
* (the default value is false as per Stax 1.0 specs).
*/
public XMLStreamReader2 createSR(ReaderConfig cfg, String systemId, InputBootstrapper bs,
boolean forER,
boolean autoCloseInput)
throws XMLStreamException
{
// 16-Aug-2004, TSa: Maybe we have a context?
URL src = cfg.getBaseURL();
// If not, maybe we can derive it from system id?
if ((src == null) && (systemId != null && systemId.length() > 0)) {
try {
src = URLUtil.urlFromSystemId(systemId);
} catch (IOException ie) {
throw new WstxIOException(ie);
}
}
return doCreateSR(cfg, systemId, bs, src, forER, autoCloseInput);
}
protected XMLStreamReader2 createSR(String systemId, InputStream in, String enc,
boolean forER,
boolean autoCloseInput)
throws XMLStreamException
{
// sanity check:
if (in == null) {
throw new IllegalArgumentException("Null InputStream is not a valid argument");
}
ReaderConfig cfg = createPrivateConfig();
if (enc == null || enc.length() == 0) {
return createSR(cfg, systemId, StreamBootstrapper.getInstance
(in, null, systemId), forER, autoCloseInput);
}
/* !!! 17-Feb-2006, TSa: We don't yet know if it's xml 1.0 or 1.1;
* so have to specify 1.0 (which is less restrictive WRT input
* streams). Would be better to let bootstrapper deal with it
* though:
*/
Reader r = DefaultInputResolver.constructOptimizedReader(cfg, in, false, enc);
return createSR(cfg, systemId, ReaderBootstrapper.getInstance
(r, null, systemId, enc), forER, autoCloseInput);
}
protected XMLStreamReader2 createSR(ReaderConfig cfg, URL src, boolean forER, boolean autoCloseInput)
throws XMLStreamException
{
try {
return createSR(cfg, src, URLUtil.optimizedStreamFromURL(src),
forER, autoCloseInput);
} catch (IOException ioe) {
throw new WstxIOException(ioe);
}
}
private XMLStreamReader2 createSR(ReaderConfig cfg, URL src, InputStream in,
boolean forER,
boolean autoCloseInput)
throws XMLStreamException
{
String systemId = src.toExternalForm();
return doCreateSR(cfg, systemId,
StreamBootstrapper.getInstance(in, null, systemId),
src, forER, autoCloseInput);
}
protected XMLStreamReader2 createSR(String systemId, Reader r,
boolean forER,
boolean autoCloseInput)
throws XMLStreamException
{
return createSR(createPrivateConfig(), systemId,
ReaderBootstrapper.getInstance
(r, null, systemId, null), forER, autoCloseInput);
}
protected XMLStreamReader2 createSR(File f, boolean forER,
boolean autoCloseInput)
throws XMLStreamException
{
try {
return createSR(createPrivateConfig(), f.toURL(), new FileInputStream(f),
forER, autoCloseInput);
} catch (IOException ie) {
throw new WstxIOException(ie);
}
}
/**
* Another internal factory method, used when dealing with a generic
* Source base type. One thing worth noting is that 'auto-closing'
* will be enabled if the input source or Reader is constructed (and
* thus owned) by Woodstox.
*/
protected XMLStreamReader2 createSR(javax.xml.transform.Source src,
boolean forER)
throws XMLStreamException
{
ReaderConfig cfg = createPrivateConfig();
Reader r = null;
InputStream in = null;
String pubId = null;
String sysId = null;
String encoding = null;
boolean autoCloseInput;
if (src instanceof Stax2Source) {
/* 16-Aug-2006, TSa: Should have more optimized handling
* for specific types
*/
Stax2Source ss = (Stax2Source) src;
sysId = ss.getSystemId();
pubId = ss.getPublicId();
encoding = ss.getEncoding();
try {
in = ss.constructInputStream();
if (in == null) {
r = ss.constructReader();
}
} catch (IOException ioe) {
throw new WstxIOException(ioe);
}
/* Caller has no direct access to stream/reader, Woodstox
* owns it and thus has to close too
*/
autoCloseInput = true;
} else 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; no need to
* force auto-close-input
*/
autoCloseInput = cfg.willAutoCloseInput();
} else if (src instanceof SAXSource) {
SAXSource ss = (SAXSource) src;
/* 28-Jan-2006, TSa: Not a complete implementation, but maybe
* even this might help...
*/
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; no need to
* force auto-close-input
*/
autoCloseInput = cfg.willAutoCloseInput();
} else if (src instanceof DOMSource) {
DOMSource domSrc = (DOMSource) src;
// SymbolTable not used by the DOM-based 'reader':
return DOMWrappingReader.createFrom(cfg, domSrc);
} else {
throw new IllegalArgumentException("Can not instantiate StAX reader for XML source type "+src.getClass()+" (unrecognized type)");
}
InputBootstrapper bs;
if (r != null) {
bs = ReaderBootstrapper.getInstance(r, pubId, sysId, encoding);
} else if (in != null) {
bs = StreamBootstrapper.getInstance(in, pubId, sysId);
} else if (sysId != null) {
try {
return createSR(cfg, URLUtil.urlFromSystemId(sysId),
forER, autoCloseInput);
} catch (IOException ioe) {
throw new WstxIOException(ioe);
}
} else {
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)");
}
return createSR(cfg, sysId, bs, forER, autoCloseInput);
}
protected XMLEventAllocator createEventAllocator()
{
// Explicitly set allocate?
if (mAllocator != null) {
return mAllocator.newInstance();
}
/* Complete or fast one? Note: standard allocator is designed
* in such a way that newInstance() need not be called (calling
* it wouldn't do anything, anyway)
*/
return mConfig.willPreserveLocation() ?
DefaultEventAllocator.getDefaultInstance()
: DefaultEventAllocator.getFastInstance();
}
/**
* Method called to construct a copy of the factory's configuration
* object, such that two will be unlinked (changes to one are not
* reflect in the other).
*
* Note: only public so that other woodstox components outside of
* this package can access it.
*/
public ReaderConfig createPrivateConfig()
{
return mConfig.createNonShared(mSymbols.makeChild());
}
}