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/*
* $Id: JAXPFactory.java,v 1.1.1.1 2003-02-01 02:10:09 cbj Exp $
* Copyright (C) 2001 David Brownell
*
* This file is part of GNU JAXP, a library.
*
* GNU JAXP is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNU JAXP is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* As a special exception, if you link this library with other files to
* produce an executable, this library does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* This exception does not however invalidate any other reasons why the
* executable file might be covered by the GNU General Public License.
*/
package gnu.xml.aelfred2;
import java.util.Enumeration;
import java.util.Hashtable;
import org.xml.sax.Parser;
import org.xml.sax.XMLReader;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.helpers.XMLReaderAdapter;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
/**
* Configurable factory to create an Ælfred2 JAXP parser; required
* to bootstrap using JAXP. You should use SAX2 directly where possible,
* rather than through JAXP, since that gives you better control.
* This class would normally be configured as a platform default factory.
*
* @author David Brownell
*/
public final class JAXPFactory extends SAXParserFactory
{
private Hashtable flags = new Hashtable ();
/**
* Constructs a factory which normally returns a non-validating
* parser.
*/
public JAXPFactory () { }
public SAXParser newSAXParser ()
throws ParserConfigurationException, SAXException
{
JaxpParser jaxp = new JaxpParser ();
Enumeration e = flags.keys ();
XMLReader parser = jaxp.getXMLReader ();
parser.setFeature (
SAXDriver.FEATURE + "namespaces",
isNamespaceAware ());
parser.setFeature (
SAXDriver.FEATURE + "validation",
isValidating ());
// that makes SAX2 feature flags trump JAXP
while (e.hasMoreElements ()) {
String uri = (String) e.nextElement ();
Boolean value = (Boolean) flags.get (uri);
parser.setFeature (uri, value.booleanValue ());
}
return jaxp;
}
// yes, this "feature transfer" mechanism doesn't play well
public void setFeature (String name, boolean value)
throws
ParserConfigurationException,
SAXNotRecognizedException,
SAXNotSupportedException
{
try {
// force "early" detection of errors where possible
// (flags can't necessarily be set before parsing)
new JaxpParser ().getXMLReader ().setFeature (name, value);
flags.put (name, new Boolean (value));
} catch (SAXNotRecognizedException e) {
throw new SAXNotRecognizedException (name);
} catch (SAXNotSupportedException e) {
throw new SAXNotSupportedException (name);
} catch (Exception e) {
throw new ParserConfigurationException (
e.getClass ().getName ()
+ ": "
+ e.getMessage ());
}
}
public boolean getFeature (String name)
throws
ParserConfigurationException,
SAXNotRecognizedException,
SAXNotSupportedException
{
Boolean value = (Boolean) flags.get (name);
if (value == null)
return value.booleanValue ();
else
try {
return new JaxpParser ().getXMLReader ().getFeature (name);
} catch (SAXNotRecognizedException e) {
throw new SAXNotRecognizedException (name);
} catch (SAXNotSupportedException e) {
throw new SAXNotSupportedException (name);
} catch (SAXException e) {
throw new ParserConfigurationException (
e.getClass ().getName ()
+ ": "
+ e.getMessage ());
}
}
private static class JaxpParser extends SAXParser
{
private XmlReader ae2 = new XmlReader ();
private XMLReaderAdapter parser = null;
JaxpParser () { }
public void setProperty (String id, Object value)
throws SAXNotRecognizedException, SAXNotSupportedException
{ ae2.setProperty (id, value); }
public Object getProperty (String id)
throws SAXNotRecognizedException, SAXNotSupportedException
{ return ae2.getProperty (id); }
public Parser getParser ()
throws SAXException
{
if (parser == null)
parser = new XMLReaderAdapter (ae2);
return parser;
}
public XMLReader getXMLReader ()
throws SAXException
{ return ae2; }
public boolean isNamespaceAware ()
{
try {
return ae2.getFeature (SAXDriver.FEATURE + "namespaces");
} catch (Exception e) {
throw new Error ();
}
}
public boolean isValidating ()
{
try {
return ae2.getFeature (SAXDriver.FEATURE + "validation");
} catch (Exception e) {
throw new Error ();
}
}
}
}
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