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Adding a fallback DOMImplementationSource: the DOMXSImplemenationSourceImpl class from Xerces.

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git-svn-id: https://svn.apache.org/repos/asf/xml/commons/trunk@226226 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
mrglavas 2005-06-04 04:23:42 +00:00
parent 8dcb34f116
commit ad5eac5eb9
1 changed files with 186 additions and 181 deletions
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367
java/external/src/org/w3c/dom/bootstrap/DOMImplementationRegistry.java vendored
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@ -58,13 +58,18 @@ public final class DOMImplementationRegistry {
* 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;
/**
* Default DOMImplementationSource.
*/
private static final String DEFAULT_DOM_IMPLEMENTATION_SOURCE = "org.apache.xerces.dom.DOMXSImplementationSourceImpl";
/**
* The list of DOMImplementationSources.
*/
@ -75,13 +80,13 @@ public final class DOMImplementationRegistry {
* @param srcs Vector List of DOMImplementationSources
*/
private DOMImplementationRegistry(final Vector srcs) {
sources = srcs;
sources = srcs;
}
/**
* Obtain a new instance of a <code>DOMImplementationRegistry</code>.
*
* The <code>DOMImplementationRegistry</code> is initialized by the
* application or the implementation, depending on the context, by
* first checking the value of the Java system property
@ -106,47 +111,47 @@ public final class DOMImplementationRegistry {
* <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.
}
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 = DEFAULT_DOM_IMPLEMENTATION_SOURCE;
}
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);
}
/**
@ -162,17 +167,17 @@ public final class DOMImplementationRegistry {
* 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;
}
/**
@ -187,35 +192,35 @@ public final class DOMImplementationRegistry {
* @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();
}
};
}
/**
@ -224,12 +229,12 @@ public final class DOMImplementationRegistry {
* @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);
}
}
/**
@ -239,18 +244,18 @@ public final class DOMImplementationRegistry {
* @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();
}
/**
@ -262,32 +267,32 @@ public final class DOMImplementationRegistry {
* @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;
}
/**
@ -296,16 +301,16 @@ public final class DOMImplementationRegistry {
* @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;
}
/**
@ -315,20 +320,20 @@ public final class DOMImplementationRegistry {
* @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;
}
});
}
/**
@ -340,13 +345,13 @@ public final class DOMImplementationRegistry {
* @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);
}
});
}
/**
@ -359,29 +364,29 @@ public final class DOMImplementationRegistry {
* @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;
}
});
}
}
}