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* Copyright (c) 2003 World Wide Web Consortium,
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* (Massachusetts Institute of Technology, European Research Consortium for
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* Informatics and Mathematics, Keio University). All Rights Reserved. This
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* work is distributed under the W3C(r) Software License [1] in the hope that
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* it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* [1] http://www.w3.org/Consortium/Legal/2002/copyright-software-20021231
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* This class holds the list of registered DOMImplementations. The contents
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* of the registry are drawn from the System Property
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* <code>org.w3c.dom.DOMImplementationSourceList</code>, which must contain a
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* white-space delimited sequence of the names of classes implementing
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* <code>DOMImplementationSource</code>.
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* Applications may also register DOMImplementationSource
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* implementations by using a method on this class. They may then
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* query instances of the registry for implementations supporting
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* <pre class='example'>
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* // get an instance of the DOMImplementation registry
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* DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance();
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* // get a DOM implementation the Level 3 XML module
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* DOMImplementation domImpl = registry.getDOMImplementation("XML 3.0");
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* <p>This provides an application with an implementation-independent
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* @see DOMImplementation
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* @see DOMImplementationSource
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package org.apache.xerces.dom3.bootstrap;
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import java.lang.reflect.Method;
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import java.lang.reflect.InvocationTargetException;
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import java.util.StringTokenizer;
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import java.util.Vector;
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import org.apache.xerces.dom3.DOMImplementationSource;
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import org.apache.xerces.dom3.DOMImplementationList;
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import org.w3c.dom.DOMImplementation;
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public class DOMImplementationRegistry {
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// The system property to specify the DOMImplementationSource class names.
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public final static String PROPERTY =
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"org.w3c.dom.DOMImplementationSourceList";
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private Vector _sources;
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// deny construction by other classes
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private DOMImplementationRegistry() {
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// deny construction by other classes
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private DOMImplementationRegistry(Vector srcs) {
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* This method queries the System property
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* <code>org.w3c.dom.DOMImplementationSourceList</code>. If it is
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* able to read and parse the property, it attempts to instantiate
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* classes according to each space-delimited substring. Any
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* exceptions it encounters are thrown to the application. An application
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* must call this method before using the class.
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* @return an initialized instance of DOMImplementationRegistry
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public static DOMImplementationRegistry newInstance()
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throws ClassNotFoundException, InstantiationException,
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IllegalAccessException
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Vector _sources = new Vector();
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// fetch system property:
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String p = System.getProperty(PROPERTY);
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StringTokenizer st = new StringTokenizer(p);
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while (st.hasMoreTokens()) {
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String sourceName = st.nextToken();
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// Use context class loader, falling back to Class.forName
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// if and only if this fails...
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Object source = getClass(sourceName).newInstance();
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return new DOMImplementationRegistry(_sources);
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* Return the first registered implementation that has the desired
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* features, or null if none is found.
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* @param features A string that specifies which features are required.
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* This is a space separated list in which each feature is
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* specified by its name optionally followed by a space
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* and a version number.
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* This is something like: "XML 1.0 Traversal +Events 2.0"
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* @return An implementation that has the desired features, or
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* <code>null</code> if this source has none.
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public DOMImplementation getDOMImplementation(String features)
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throws ClassNotFoundException,
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InstantiationException, IllegalAccessException, ClassCastException
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int size = _sources.size();
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for (int i = 0; i < size; i++) {
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DOMImplementationSource source =
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(DOMImplementationSource) _sources.get(i);
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DOMImplementation impl = source.getDOMImplementation(features);
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* Return the list of all registered implementation that support the desired
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* @param features A string that specifies which features are required.
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* This is a space separated list in which each feature is
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* specified by its name optionally followed by a space
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* and a version number.
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* This is something like: "XML 1.0 Traversal +Events 2.0"
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* @return A list of DOMImplementations that support the desired features.
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public DOMImplementationList getDOMImplementationList(String features)
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throws ClassNotFoundException,
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InstantiationException, IllegalAccessException, ClassCastException
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int size = _sources.size();
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DOMImplementationListImpl list = new DOMImplementationListImpl();
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for (int i = 0; i < size; i++) {
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DOMImplementationSource source =
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(DOMImplementationSource) _sources.get(i);
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DOMImplementationList impls =
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source.getDOMImplementationList(features);
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for (int j = 0; j < impls.getLength(); j++) {
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list.add(impls.item(j));
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* Register an implementation.
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public void addSource(DOMImplementationSource s)
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throws ClassNotFoundException,
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InstantiationException, IllegalAccessException
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private static Class getClass (String className)
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throws ClassNotFoundException, IllegalAccessException,
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InstantiationException {
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ClassLoader cl = null;
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m = Thread.class.getMethod("getContextClassLoader", null);
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} catch (NoSuchMethodException e) {
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// Assume that we are running JDK 1.1, use the current ClassLoader
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cl = DOMImplementationRegistry.class.getClassLoader();
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cl = (ClassLoader) m.invoke(Thread.currentThread(), null);
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} catch (IllegalAccessException e) {
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throw new UnknownError(e.getMessage());
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} catch (InvocationTargetException e) {
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// assert(e.getTargetException() instanceof SecurityException)
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throw new UnknownError(e.getMessage());
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// fall back to Class.forName
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return Class.forName(className);
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return cl.loadClass(className);
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} catch (ClassNotFoundException e) {
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return Class.forName(className);
b'\\ No newline at end of file'
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src/org/apache/xerces/dom3/bootstrap/DOMImplementationRegistry.java
