org.jdom2.input.sax.XMLReaders Maven / Gradle / Ivy
/*--
Copyright (C) 2011 Jason Hunter & Brett McLaughlin.
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may "JDOM" appear in their name, without prior written permission
from the JDOM Project Management .
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"This product includes software developed by the
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created by Jason Hunter and
Brett McLaughlin . For more information
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* See the {@link org.jdom2.input.sax package documentation} for details of how
* to create the SAXParser you desire.
*
* @see org.jdom2.input.sax
* @author Rolf Lear
*/
public enum XMLReaders implements XMLReaderJDOMFactory {
/**
* The non-validating singleton
*/
NONVALIDATING(0),
/**
* The DTD-validating Singleton
*/
DTDVALIDATING(1),
/**
* The XSD-validating Singleton
*/
XSDVALIDATING(2);
private interface FactorySupplier {
SAXParserFactory supply() throws Exception;
boolean validates();
}
private enum NONSingleton implements FactorySupplier {
INSTANCE;
private final SAXParserFactory factory;
NONSingleton() {
SAXParserFactory fac = SAXParserFactory.newInstance();
// All JDOM parsers are namespace aware.
fac.setNamespaceAware(true);
fac.setValidating(false);
factory = fac;
}
@Override
public SAXParserFactory supply() throws Exception {
return factory;
}
@Override
public boolean validates() {
return false;
}
}
private enum DTDSingleton implements FactorySupplier {
INSTANCE;
private final SAXParserFactory factory;
DTDSingleton() {
SAXParserFactory fac = SAXParserFactory.newInstance();
// All JDOM parsers are namespace aware.
fac.setNamespaceAware(true);
// factory is validating (DTD)
fac.setValidating(true);
factory = fac;
}
@Override
public SAXParserFactory supply() throws Exception {
return factory;
}
@Override
public boolean validates() {
return true;
}
}
private enum XSDSingleton implements FactorySupplier {
INSTANCE;
private final Exception failcause;
private final SAXParserFactory factory;
XSDSingleton() {
SAXParserFactory fac = SAXParserFactory.newInstance();
Exception problem = null;
// All JDOM parsers are namespace aware.
fac.setNamespaceAware(true);
// factory is not validating (DTD), but the Reader is validating
// (XSD)
fac.setValidating(false);
try {
SchemaFactory sfac = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
Schema schema = sfac.newSchema();
fac.setSchema(schema);
} catch (SAXException se) {
// we could not get a validating system, set the fac to null
fac = null;
problem = se;
} catch (IllegalArgumentException iae) {
// this system does not support XSD Validation.... which is true
// for android!
// we could not get a validating system, set the fac to null
fac = null;
problem = iae;
} catch (UnsupportedOperationException uoe) {
// SAXParserFactory throws this exception when setSchema is
// called.
// Therefore every factory throws this exception unless it
// overrides
// setSchema. A popular example is Apache Xerces
// SAXParserFactoryImpl
// before version 2.7.0.
fac = null;
problem = uoe;
}
factory = fac;
failcause = problem;
}
@Override
public SAXParserFactory supply() throws Exception {
if (factory == null) {
throw failcause;
}
return factory;
}
@Override
public boolean validates() {
return true;
}
};
/** the actual SAXParserFactory in the respective singletons. */
private final int singletonID;
/** Private constructor */
private XMLReaders(int singletonID) {
this.singletonID = singletonID;
}
private FactorySupplier getSupplier() {
switch (singletonID) {
case 0:
return NONSingleton.INSTANCE;
case 1:
return DTDSingleton.INSTANCE;
case 2:
return XSDSingleton.INSTANCE;
}
throw new IllegalStateException("Unknown singletonID: " + singletonID);
}
/**
* Get a new XMLReader from this JAXP-based {@link XMLReaderJDOMFactory}.
*
*
* @return a new XMLReader instance.
* @throws JDOMException
* if there is a problem creating the XMLReader
*/
@Override
public XMLReader createXMLReader() throws JDOMException {
try {
FactorySupplier supplier = getSupplier();
return supplier.supply().newSAXParser().getXMLReader();
} catch (SAXException e) {
throw new JDOMException(
"Unable to create a new XMLReader instance", e);
} catch (ParserConfigurationException e) {
throw new JDOMException(
"Unable to create a new XMLReader instance", e);
} catch (Exception e) {
throw new JDOMException("It was not possible to configure a "
+ "suitable XMLReader to support " + this, e);
}
}
@Override
public boolean isValidating() {
return getSupplier().validates();
}
}