org.xml.sax.helpers
Class XMLReaderFactory
java.lang.Objectorg.xml.sax.helpers.XMLReaderFactory
public final class XMLReaderFactory
extends java.lang.Object
Factory for creating an XML reader.
This module, both source code and documentation, is in the
Public Domain, and comes with NO WARRANTY.
See http://www.saxproject.org
for further information.
This class contains static methods for creating an XML reader
from an explicit class name, or based on runtime defaults:
try {
XMLReader myReader = XMLReaderFactory.createXMLReader();
} catch (SAXException e) {
System.err.println(e.getMessage());
}
Note to Distributions bundled with parsers:
You should modify the implementation of the no-arguments
createXMLReader to handle cases where the external
configuration mechanisms aren't set up. That method should do its
best to return a parser when one is in the class path, even when
nothing bound its class name to
org.xml.sax.driver so
those configuration mechanisms would see it.
- SAX 2.0
createXMLReader
public static XMLReader createXMLReader()
throws SAXException Attempt to create an XMLReader from system defaults.
In environments which can support it, the name of the XMLReader
class is determined by trying each these options in order, and
using the first one which succeeds:
- If the system property
org.xml.sax.driver
has a value, that is used as an XMLReader class name.
- The JAR "Services API" is used to look for a class name
in the META-INF/services/org.xml.sax.driver file in
jarfiles available to the runtime.
- SAX parser distributions are strongly encouraged to provide
a default XMLReader class name that will take effect only when
previous options (on this list) are not successful.
- Finally, if
ParserFactory.makeParser() can
return a system default SAX1 parser, that parser is wrapped in
a ParserAdapter. (This is a migration aid for SAX1
environments, where the org.xml.sax.parser system
property will often be usable.)
In environments such as small embedded systems, which can not
support that flexibility, other mechanisms to determine the default
may be used.
Note that many Java environments allow system properties to be
initialized on a command line. This means that
in most cases
setting a good value for that property ensures that calls to this
method will succeed, except when security policies intervene.
This will also maximize application portability to older SAX
environments, with less robust implementations of this method.
- A new XMLReader.
SAXException - If no default XMLReader class
can be identified and instantiated.
createXMLReader(java.lang.String)
createXMLReader
public static XMLReader createXMLReader(String className)
throws SAXException Attempt to create an XML reader from a class name.
Given a class name, this method attempts to load
and instantiate the class as an XML reader.
Note that this method will not be usable in environments where
the caller (perhaps an applet) is not permitted to load classes
dynamically.
- A new XML reader.
SAXException - If the class cannot be
loaded, instantiated, and cast to XMLReader.
createXMLReader()