* DOMImplementationSource class names.
*/
public static final String PROPERTY =
- "org.w3c.dom.DOMImplementationSourceList";
-
+ "org.w3c.dom.DOMImplementationSourceList";
+
/**
* Default columns per line.
*/
private static final int DEFAULT_LINE_LENGTH = 80;
-
+
/**
* The list of DOMImplementationSources.
*/
private Vector sources;
-
+
/**
* Private constructor.
* @param srcs Vector List of DOMImplementationSources
*/
private DOMImplementationRegistry(final Vector srcs) {
- sources = srcs;
+ sources = srcs;
}
-
+
/**
* Obtain a new instance of a <code>DOMImplementationRegistry</code>.
*
* <code>DOMImplementationSource</code>
*/
public static DOMImplementationRegistry newInstance()
- throws
- ClassNotFoundException,
- InstantiationException,
- IllegalAccessException,
- ClassCastException {
- Vector sources = new Vector();
-
- ClassLoader classLoader = getClassLoader();
- // fetch system property:
- String p = getSystemProperty(PROPERTY);
-
- //
- // if property is not specified then use contents of
+ throws
+ ClassNotFoundException,
+ InstantiationException,
+ IllegalAccessException,
+ ClassCastException {
+ Vector sources = new Vector();
+
+ ClassLoader classLoader = getClassLoader();
+ // fetch system property:
+ String p = getSystemProperty(PROPERTY);
+
+ //
+ // if property is not specified then use contents of
// META_INF/org.w3c.dom.DOMImplementationSourceList from classpath
- if (p == null) {
- p = getServiceValue(classLoader);
- }
if (p == null) {
- //
- // DOM Implementations can modify here to add *additional* fallback
- // mechanisms to access a list of default DOMImplementationSources.
- p = "gnu.xml.dom.ImplementationSource";
- }
- if (p != null) {
- StringTokenizer st = new StringTokenizer(p);
- while (st.hasMoreTokens()) {
- String sourceName = st.nextToken();
- // Use context class loader, falling back to Class.forName
- // if and only if this fails...
- Class sourceClass = null;
- if (classLoader != null) {
- sourceClass = classLoader.loadClass(sourceName);
- } else {
- sourceClass = Class.forName(sourceName);
- }
- DOMImplementationSource source =
- (DOMImplementationSource) sourceClass.newInstance();
- sources.addElement(source);
- }
- }
- return new DOMImplementationRegistry(sources);
+ p = getServiceValue(classLoader);
+ }
+ if (p == null) {
+ //
+ // DOM Implementations can modify here to add *additional* fallback
+ // mechanisms to access a list of default DOMImplementationSources.
+ p = "gnu.xml.dom.ImplementationSource";
+ }
+ if (p != null) {
+ StringTokenizer st = new StringTokenizer(p);
+ while (st.hasMoreTokens()) {
+ String sourceName = st.nextToken();
+ // Use context class loader, falling back to Class.forName
+ // if and only if this fails...
+ Class sourceClass = null;
+ if (classLoader != null) {
+ sourceClass = classLoader.loadClass(sourceName);
+ } else {
+ sourceClass = Class.forName(sourceName);
+ }
+ DOMImplementationSource source =
+ (DOMImplementationSource) sourceClass.newInstance();
+ sources.addElement(source);
+ }
+ }
+ return new DOMImplementationRegistry(sources);
}
-
+
/**
* Return the first implementation that has the desired
* features, or <code>null</code> if none is found.
* or <code>null</code> if none found.
*/
public DOMImplementation getDOMImplementation(final String features) {
- int size = sources.size();
- String name = null;
- for (int i = 0; i < size; i++) {
- DOMImplementationSource source =
- (DOMImplementationSource) sources.elementAt(i);
- DOMImplementation impl = source.getDOMImplementation(features);
- if (impl != null) {
- return impl;
- }
- }
- return null;
+ int size = sources.size();
+ String name = null;
+ for (int i = 0; i < size; i++) {
+ DOMImplementationSource source =
+ (DOMImplementationSource) sources.elementAt(i);
+ DOMImplementation impl = source.getDOMImplementation(features);
+ if (impl != null) {
+ return impl;
+ }
+ }
+ return null;
}
-
+
/**
* Return a list of implementations that support the
* desired features.
* @return A list of DOMImplementations that support the desired features.
*/
public DOMImplementationList getDOMImplementationList(final String features) {
- final Vector implementations = new Vector();
- int size = sources.size();
- for (int i = 0; i < size; i++) {
- DOMImplementationSource source =
- (DOMImplementationSource) sources.elementAt(i);
- DOMImplementationList impls =
- source.getDOMImplementationList(features);
- for (int j = 0; j < impls.getLength(); j++) {
- DOMImplementation impl = impls.item(j);
- implementations.addElement(impl);
- }
- }
- return new DOMImplementationList() {
- public DOMImplementation item(final int index) {
- if (index >= 0 && index < implementations.size()) {
- try {
- return (DOMImplementation)
- implementations.elementAt(index);
- } catch (ArrayIndexOutOfBoundsException e) {
- return null;
- }
- }
- return null;
- }
-
- public int getLength() {
- return implementations.size();
- }
- };
+ final Vector implementations = new Vector();
+ int size = sources.size();
+ for (int i = 0; i < size; i++) {
+ DOMImplementationSource source =
+ (DOMImplementationSource) sources.elementAt(i);
+ DOMImplementationList impls =
+ source.getDOMImplementationList(features);
+ for (int j = 0; j < impls.getLength(); j++) {
+ DOMImplementation impl = impls.item(j);
+ implementations.addElement(impl);
+ }
+ }
+ return new DOMImplementationList() {
+ public DOMImplementation item(final int index) {
+ if (index >= 0 && index < implementations.size()) {
+ try {
+ return (DOMImplementation)
+ implementations.elementAt(index);
+ } catch (ArrayIndexOutOfBoundsException e) {
+ return null;
+ }
+ }
+ return null;
+ }
+
+ public int getLength() {
+ return implementations.size();
+ }
+ };
}
-
+
/**
* Register an implementation.
*
* @param s The source to be registered, may not be <code>null</code>
*/
public void addSource(final DOMImplementationSource s) {
- if (s == null) {
- throw new NullPointerException();
- }
- if (!sources.contains(s)) {
- sources.addElement(s);
- }
+ if (s == null) {
+ throw new NullPointerException();
+ }
+ if (!sources.contains(s)) {
+ sources.addElement(s);
+ }
}
-
+
/**
*
* Gets a class loader.
* @return A class loader, possibly <code>null</code>
*/
private static ClassLoader getClassLoader() {
- try {
- ClassLoader contextClassLoader = getContextClassLoader();
-
- if (contextClassLoader != null) {
- return contextClassLoader;
- }
- } catch (Exception e) {
- // Assume that the DOM application is in a JRE 1.1, use the
- // current ClassLoader
- return DOMImplementationRegistry.class.getClassLoader();
- }
- return DOMImplementationRegistry.class.getClassLoader();
+ try {
+ ClassLoader contextClassLoader = getContextClassLoader();
+
+ if (contextClassLoader != null) {
+ return contextClassLoader;
+ }
+ } catch (Exception e) {
+ // Assume that the DOM application is in a JRE 1.1, use the
+ // current ClassLoader
+ return DOMImplementationRegistry.class.getClassLoader();
+ }
+ return DOMImplementationRegistry.class.getClassLoader();
}
-
+
/**
* This method attempts to return the first line of the resource
* META_INF/services/org.w3c.dom.DOMImplementationSourceList
* @return first line of resource, or <code>null</code>
*/
private static String getServiceValue(final ClassLoader classLoader) {
- String serviceId = "META-INF/services/" + PROPERTY;
- // try to find services in CLASSPATH
- try {
- InputStream is = getResourceAsStream(classLoader, serviceId);
-
- if (is != null) {
- BufferedReader rd;
- try {
- rd =
- new BufferedReader(new InputStreamReader(is, "UTF-8"),
- DEFAULT_LINE_LENGTH);
- } catch (java.io.UnsupportedEncodingException e) {
- rd =
- new BufferedReader(new InputStreamReader(is),
- DEFAULT_LINE_LENGTH);
- }
- String serviceValue = rd.readLine();
- rd.close();
- if (serviceValue != null && serviceValue.length() > 0) {
- return serviceValue;
- }
- }
- } catch (Exception ex) {
- return null;
- }
- return null;
+ String serviceId = "META-INF/services/" + PROPERTY;
+ // try to find services in CLASSPATH
+ try {
+ InputStream is = getResourceAsStream(classLoader, serviceId);
+
+ if (is != null) {
+ BufferedReader rd;
+ try {
+ rd =
+ new BufferedReader(new InputStreamReader(is, "UTF-8"),
+ DEFAULT_LINE_LENGTH);
+ } catch (java.io.UnsupportedEncodingException e) {
+ rd =
+ new BufferedReader(new InputStreamReader(is),
+ DEFAULT_LINE_LENGTH);
+ }
+ String serviceValue = rd.readLine();
+ rd.close();
+ if (serviceValue != null && serviceValue.length() > 0) {
+ return serviceValue;
+ }
+ }
+ } catch (Exception ex) {
+ return null;
+ }
+ return null;
}
-
+
/**
* A simple JRE (Java Runtime Environment) 1.1 test
*
- * @return <code>true</code> if JRE 1.1
+ * @return <code>true</code> if JRE 1.1
*/
private static boolean isJRE11() {
- try {
- Class c = Class.forName("java.security.AccessController");
- // java.security.AccessController existed since 1.2 so, if no
- // exception was thrown, the DOM application is running in a JRE
- // 1.2 or higher
- return false;
- } catch (Exception ex) {
- // ignore
- }
- return true;
+ try {
+ Class c = Class.forName("java.security.AccessController");
+ // java.security.AccessController existed since 1.2 so, if no
+ // exception was thrown, the DOM application is running in a JRE
+ // 1.2 or higher
+ return false;
+ } catch (Exception ex) {
+ // ignore
+ }
+ return true;
}
-
+
/**
* This method returns the ContextClassLoader or <code>null</code> if
* running in a JRE 1.1
* @return The Context Classloader
*/
private static ClassLoader getContextClassLoader() {
- return isJRE11()
- ? null
- : (ClassLoader)
- AccessController.doPrivileged(new PrivilegedAction() {
- public Object run() {
- ClassLoader classLoader = null;
- try {
- classLoader =
- Thread.currentThread().getContextClassLoader();
- } catch (SecurityException ex) {
- }
- return classLoader;
- }
- });
+ return isJRE11()
+ ? null
+ : (ClassLoader)
+ AccessController.doPrivileged(new PrivilegedAction() {
+ public Object run() {
+ ClassLoader classLoader = null;
+ try {
+ classLoader =
+ Thread.currentThread().getContextClassLoader();
+ } catch (SecurityException ex) {
+ }
+ return classLoader;
+ }
+ });
}
-
+
/**
* This method returns the system property indicated by the specified name
* after checking access control privileges. For a JRE 1.1, this check is
* not done.
- *
- * @param name the name of the system property
+ *
+ * @param name the name of the system property
* @return the system property
*/
private static String getSystemProperty(final String name) {
- return isJRE11()
- ? (String) System.getProperty(name)
- : (String) AccessController.doPrivileged(new PrivilegedAction() {
- public Object run() {
- return System.getProperty(name);
- }
- });
+ return isJRE11()
+ ? (String) System.getProperty(name)
+ : (String) AccessController.doPrivileged(new PrivilegedAction() {
+ public Object run() {
+ return System.getProperty(name);
+ }
+ });
}
-
+
/**
* This method returns an Inputstream for the reading resource
* META_INF/services/org.w3c.dom.DOMImplementationSourceList after checking
* access control privileges. For a JRE 1.1, this check is not done.
*
- * @param classLoader classLoader
- * @param name the resource
+ * @param classLoader classLoader
+ * @param name the resource
* @return an Inputstream for the resource specified
*/
private static InputStream getResourceAsStream(final ClassLoader classLoader,
- final String name) {
- if (isJRE11()) {
- InputStream ris;
- if (classLoader == null) {
- ris = ClassLoader.getSystemResourceAsStream(name);
- } else {
- ris = classLoader.getResourceAsStream(name);
- }
- return ris;
- } else {
- return (InputStream)
- AccessController.doPrivileged(new PrivilegedAction() {
- public Object run() {
- InputStream ris;
- if (classLoader == null) {
- ris =
- ClassLoader.getSystemResourceAsStream(name);
- } else {
- ris = classLoader.getResourceAsStream(name);
- }
- return ris;
- }
- });
- }
+ final String name) {
+ if (isJRE11()) {
+ InputStream ris;
+ if (classLoader == null) {
+ ris = ClassLoader.getSystemResourceAsStream(name);
+ } else {
+ ris = classLoader.getResourceAsStream(name);
+ }
+ return ris;
+ } else {
+ return (InputStream)
+ AccessController.doPrivileged(new PrivilegedAction() {
+ public Object run() {
+ InputStream ris;
+ if (classLoader == null) {
+ ris =
+ ClassLoader.getSystemResourceAsStream(name);
+ } else {
+ ris = classLoader.getResourceAsStream(name);
+ }
+ return ris;
+ }
+ });
+ }
}
}
OSDN Git Service
