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*
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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/**
* Defines a factory API that enables applications to configure and
* obtain a SAX based parser to parse XML documents.
*
* @author <a href="mailto:Jeff.Suttor@Sun.com">Jeff Suttor</a>
* @author <a href="mailto:Neeraj.Bajaj@sun.com">Neeraj Bajaj</a>
*
* @version $Revision: 1.9 $, $Date: 2010/05/25 16:19:44 $
*
*/
public abstract class SAXParserFactory {
/** The default property name according to the JAXP spec */
/**
* <p>Should Parsers be validating?</p>
*/
private boolean validating = false;
/**
* <p>Should Parsers be namespace aware?</p>
*/
private boolean namespaceAware = false;
/**
* <p>Protected constructor to force use of {@link #newInstance()}.</p>
*/
protected SAXParserFactory () {
}
/**
* Obtain a new instance of a <code>SAXParserFactory</code>. This
* static method creates a new factory instance
* This method uses the following ordered lookup procedure to determine
* the <code>SAXParserFactory</code> implementation class to
* load:
* <ul>
* <li>
* Use the <code>javax.xml.parsers.SAXParserFactory</code> system
* property.
* </li>
* <li>
* Use the properties file "lib/jaxp.properties" in the JRE directory.
* This configuration file is in standard <code>java.util.Properties
* </code> format and contains the fully qualified name of the
* implementation class with the key being the system property defined
* above.
*
* The jaxp.properties file is read only once by the JAXP implementation
* and it's values are then cached for future use. If the file does not exist
* when the first attempt is made to read from it, no further attempts are
* made to check for its existence. It is not possible to change the value
* of any property in jaxp.properties after it has been read for the first time.
* </li>
* <li>
* Use the Services API (as detailed in the JAR specification), if
* available, to determine the classname. The Services API will look
* for a classname in the file
* <code>META-INF/services/javax.xml.parsers.SAXParserFactory</code>
* in jars available to the runtime.
* </li>
* <li>
* Platform default <code>SAXParserFactory</code> instance.
* </li>
* </ul>
*
* Once an application has obtained a reference to a
* <code>SAXParserFactory</code> it can use the factory to
* configure and obtain parser instances.
*
*
*
* <h2>Tip for Trouble-shooting</h2>
* <p>Setting the <code>jaxp.debug</code> system property will cause
* this method to print a lot of debug messages
* to <code>System.err</code> about what it is doing and where it is looking at.</p>
*
* <p> If you have problems loading {@link DocumentBuilder}s, try:</p>
* <pre>
* java -Djaxp.debug=1 YourProgram ....
* </pre>
*
*
* @return A new instance of a SAXParserFactory.
*
* @throws FactoryConfigurationError if the implementation is
* not available or cannot be instantiated.
*/
try {
/* The default property name according to the JAXP spec */
"javax.xml.parsers.SAXParserFactory",
/* The fallback implementation class name */
"com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl");
} catch (FactoryFinder.ConfigurationError e) {
throw new FactoryConfigurationError(e.getException(),
e.getMessage());
}
}
/**
* <p>Obtain a new instance of a <code>SAXParserFactory</code> from class name.
* This function is useful when there are multiple providers in the classpath.
* It gives more control to the application as it can specify which provider
* should be loaded.</p>
*
* <p>Once an application has obtained a reference to a <code>SAXParserFactory</code>
* it can use the factory to configure and obtain parser instances.</p>
*
*
* <h2>Tip for Trouble-shooting</h2>
* <p>Setting the <code>jaxp.debug</code> system property will cause
* this method to print a lot of debug messages
* to <code>System.err</code> about what it is doing and where it is looking at.</p>
*
* <p> If you have problems, try:</p>
* <pre>
* java -Djaxp.debug=1 YourProgram ....
* </pre>
*
* @param factoryClassName fully qualified factory class name that provides implementation of <code>javax.xml.parsers.SAXParserFactory</code>.
*
* @param classLoader <code>ClassLoader</code> used to load the factory class. If <code>null</code>
* current <code>Thread</code>'s context classLoader is used to load the factory class.
*
* @return New instance of a <code>SAXParserFactory</code>
*
* @throws FactoryConfigurationError if <code>factoryClassName</code> is <code>null</code>, or
* the factory class cannot be loaded, instantiated.
*
* @see #newInstance()
*
* @since 1.6
*/
try {
//do not fallback if given classloader can't find the class, throw exception
} catch (FactoryFinder.ConfigurationError e) {
throw new FactoryConfigurationError(e.getException(),
e.getMessage());
}
}
/**
* <p>Creates a new instance of a SAXParser using the currently
* configured factory parameters.</p>
*
* @return A new instance of a SAXParser.
*
* @throws ParserConfigurationException if a parser cannot
* be created which satisfies the requested configuration.
* @throws SAXException for SAX errors.
*/
throws ParserConfigurationException, SAXException;
/**
* Specifies that the parser produced by this code will
* provide support for XML namespaces. By default the value of this is set
* to <code>false</code>.
*
* @param awareness true if the parser produced by this code will
* provide support for XML namespaces; false otherwise.
*/
this.namespaceAware = awareness;
}
/**
* Specifies that the parser produced by this code will
* validate documents as they are parsed. By default the value of this is
* set to <code>false</code>.
*
* <p>
* Note that "the validation" here means
* <a href="http://www.w3.org/TR/REC-xml#proc-types">a validating
* parser</a> as defined in the XML recommendation.
* In other words, it essentially just controls the DTD validation.
* (except the legacy two properties defined in JAXP 1.2.)
* </p>
*
* <p>
* To use modern schema languages such as W3C XML Schema or
* RELAX NG instead of DTD, you can configure your parser to be
* a non-validating parser by leaving the {@link #setValidating(boolean)}
* method <code>false</code>, then use the {@link #setSchema(Schema)}
* method to associate a schema to a parser.
* </p>
*
* @param validating true if the parser produced by this code will
* validate documents as they are parsed; false otherwise.
*/
this.validating = validating;
}
/**
* Indicates whether or not the factory is configured to produce
* parsers which are namespace aware.
*
* @return true if the factory is configured to produce
* parsers which are namespace aware; false otherwise.
*/
public boolean isNamespaceAware() {
return namespaceAware;
}
/**
* Indicates whether or not the factory is configured to produce
* parsers which validate the XML content during parse.
*
* @return true if the factory is configured to produce parsers which validate
* the XML content during parse; false otherwise.
*/
public boolean isValidating() {
return validating;
}
/**
*
* <p>Sets the particular feature in the underlying implementation of
* org.xml.sax.XMLReader.
* A list of the core features and properties can be found at
* <a href="http://www.saxproject.org/">http://www.saxproject.org/</a></p>
*
* <p>All implementations are required to support the {@link javax.xml.XMLConstants#FEATURE_SECURE_PROCESSING} feature.
* When the feature is</p>
* <ul>
* <li>
* <code>true</code>: the implementation will limit XML processing to conform to implementation limits.
* Examples include enity expansion limits and XML Schema constructs that would consume large amounts of resources.
* If XML processing is limited for security reasons, it will be reported via a call to the registered
* {@link org.xml.sax.ErrorHandler#fatalError(SAXParseException exception)}.
* See {@link SAXParser} <code>parse</code> methods for handler specification.
* </li>
* <li>
* When the feature is <code>false</code>, the implementation will processing XML according to the XML specifications without
* regard to possible implementation limits.
* </li>
* </ul>
*
* @param name The name of the feature to be set.
* @param value The value of the feature to be set.
*
* @throws ParserConfigurationException if a parser cannot
* be created which satisfies the requested configuration.
* @throws SAXNotRecognizedException When the underlying XMLReader does
* not recognize the property name.
* @throws SAXNotSupportedException When the underlying XMLReader
* recognizes the property name but doesn't support the
* property.
* @throws NullPointerException If the <code>name</code> parameter is null.
*
* @see org.xml.sax.XMLReader#setFeature
*/
/**
*
* <p>Returns the particular property requested for in the underlying
* implementation of org.xml.sax.XMLReader.</p>
*
* @param name The name of the property to be retrieved.
*
* @return Value of the requested property.
*
* @throws ParserConfigurationException if a parser cannot be created which satisfies the requested configuration.
* @throws SAXNotRecognizedException When the underlying XMLReader does not recognize the property name.
* @throws SAXNotSupportedException When the underlying XMLReader recognizes the property name but doesn't support the property.
*
* @see org.xml.sax.XMLReader#getProperty
*/
/* <p>Get current state of canonicalization.</p>
*
* @return current state canonicalization control
*/
/*
public boolean getCanonicalization() {
return canonicalState;
}
*/
/**
* Gets the {@link Schema} object specified through
* the {@link #setSchema(Schema schema)} method.
*
*
* @throws UnsupportedOperationException When implementation does not
* override this method
*
* @return
* the {@link Schema} object that was last set through
* the {@link #setSchema(Schema)} method, or null
* if the method was not invoked since a {@link SAXParserFactory}
* is created.
*
* @since 1.5
*/
throw new UnsupportedOperationException(
"This parser does not support specification \""
+ "\" version \""
+ "\""
);
}
/** <p>Set canonicalization control to <code>true</code> or
* </code>false</code>.</p>
*
* @param state of canonicalization
*/
/*
public void setCanonicalization(boolean state) {
canonicalState = state;
}
*/
/**
* <p>Set the {@link Schema} to be used by parsers created
* from this factory.</p>
*
* <p>When a {@link Schema} is non-null, a parser will use a validator
* created from it to validate documents before it passes information
* down to the application.</p>
*
* handle them as if those errors were found by the parser itself.
* In other words, if the user-specified {@link org.xml.sax.ErrorHandler}
* is set, it must receive those errors, and if not, they must be
* treated according to the implementation specific
* default error handling rules.
*
* <p>A validator may modify the SAX event stream (for example by
* adding default values that were missing in documents), and a parser
* is responsible to make sure that the application will receive
* those modified event stream.</p>
*
* <p>Initialy, <code>null</code> is set as the {@link Schema}.</p>
*
* <p>This processing will take effect even if
* the {@link #isValidating()} method returns <code>false</code>.
*
* <p>It is an error to use
* the <code>http://java.sun.com/xml/jaxp/properties/schemaSource</code>
* property and/or the <code>http://java.sun.com/xml/jaxp/properties/schemaLanguage</code>
* property in conjunction with a non-null {@link Schema} object.
* Such configuration will cause a {@link SAXException}
* exception when those properties are set on a {@link SAXParser}.</p>
*
* <h4>Note for implmentors</h4>
* <p>
* A parser must be able to work with any {@link Schema}
* implementation. However, parsers and schemas are allowed
* to use implementation-specific custom mechanisms
* as long as they yield the result described in the specification.
* </p>
*
* @param schema <code>Schema</code> to use, <code>null</code> to remove a schema.
*
* @throws UnsupportedOperationException When implementation does not
* override this method
*
* @since 1.5
*/
throw new UnsupportedOperationException(
"This parser does not support specification \""
+ "\" version \""
+ "\""
);
}
/**
* <p>Set state of XInclude processing.</p>
*
* <p>If XInclude markup is found in the document instance, should it be
* processed as specified in <a href="http://www.w3.org/TR/xinclude/">
* XML Inclusions (XInclude) Version 1.0</a>.</p>
*
* <p>XInclude processing defaults to <code>false</code>.</p>
*
* @param state Set XInclude processing to <code>true</code> or
* <code>false</code>
*
* @throws UnsupportedOperationException When implementation does not
* override this method
*
* @since 1.5
*/
if (state) {
throw new UnsupportedOperationException(" setXIncludeAware " +
"is not supported on this JAXP" +
" implementation or earlier: " + this.getClass());
}
}
/**
* <p>Get state of XInclude processing.</p>
*
* @return current state of XInclude processing
*
* @throws UnsupportedOperationException When implementation does not
* override this method
*
* @since 1.5
*/
public boolean isXIncludeAware() {
throw new UnsupportedOperationException(
"This parser does not support specification \""
+ "\" version \""
+ "\""
);
}
}