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Use multiple class loaders to try to load smack.providers file.
git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@2154 b35dd754-fafc-0310-a699-88a17e54d16e
This commit is contained in:
Matt Tucker
mtucker
parent
8688966ca6
commit
d4d351aae2
1 changed files with 103 additions and 83 deletions
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@ -146,95 +146,103 @@ public class ProviderManager {
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static {
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// Load IQ processing providers.
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try {
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Enumeration enum = ProviderManager.class.getClassLoader().getResources(
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"META-INF/smack.providers");
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while (enum.hasMoreElements()) {
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URL url = (URL)enum.nextElement();
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java.io.InputStream providerStream = null;
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try {
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providerStream = url.openStream();
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XmlPullParserFactory factory = XmlPullParserFactory.newInstance(
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"org.xmlpull.mxp1.MXParserFactory", null);
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factory.setNamespaceAware(true);
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XmlPullParser parser = factory.newPullParser();
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parser.setInput(providerStream, "UTF-8");
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int eventType = parser.getEventType();
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do {
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if (eventType == XmlPullParser.START_TAG) {
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if (parser.getName().equals("iqProvider")) {
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parser.next();
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parser.next();
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String elementName = parser.nextText();
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parser.next();
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parser.next();
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String namespace = parser.nextText();
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parser.next();
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parser.next();
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String className = parser.nextText();
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// Only add the provider for the namespace if one isn't
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// already registered.
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String key = getProviderKey(elementName, namespace);
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if (!iqProviders.containsKey(key)) {
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// Attempt to load the provider class and then create
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// a new instance if it's an IQProvider. Otherwise, if it's
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// an IQ class, add the class object itself, then we'll use
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// reflection later to create instances of the class.
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try {
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// Add the provider to the map.
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Class provider = Class.forName(className);
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if (IQProvider.class.isAssignableFrom(provider)) {
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iqProviders.put(key, provider.newInstance());
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// Get an array of class loaders to try loading the providers files from.
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ClassLoader[] classLoaders = getClassLoaders();
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for (int i=0; i<classLoaders.length; i++) {
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Enumeration enum = classLoaders[i].getResources(
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"META-INF/smack.providers");
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while (enum.hasMoreElements()) {
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URL url = (URL)enum.nextElement();
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java.io.InputStream providerStream = null;
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try {
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providerStream = url.openStream();
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XmlPullParserFactory factory = XmlPullParserFactory.newInstance(
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"org.xmlpull.mxp1.MXParserFactory", null);
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factory.setNamespaceAware(true);
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XmlPullParser parser = factory.newPullParser();
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parser.setInput(providerStream, "UTF-8");
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int eventType = parser.getEventType();
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do {
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if (eventType == XmlPullParser.START_TAG) {
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if (parser.getName().equals("iqProvider")) {
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parser.next();
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parser.next();
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String elementName = parser.nextText();
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parser.next();
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parser.next();
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String namespace = parser.nextText();
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parser.next();
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parser.next();
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String className = parser.nextText();
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// Only add the provider for the namespace if one isn't
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// already registered.
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String key = getProviderKey(elementName, namespace);
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if (!iqProviders.containsKey(key)) {
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// Attempt to load the provider class and then create
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// a new instance if it's an IQProvider. Otherwise, if it's
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// an IQ class, add the class object itself, then we'll use
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// reflection later to create instances of the class.
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try {
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// Add the provider to the map.
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Class provider = Class.forName(className);
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if (IQProvider.class.isAssignableFrom(provider)) {
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iqProviders.put(key, provider.newInstance());
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}
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else if (IQ.class.isAssignableFrom(provider)) {
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iqProviders.put(key, provider);
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}
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}
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else if (IQ.class.isAssignableFrom(provider)) {
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iqProviders.put(key, provider);
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catch (ClassNotFoundException cnfe) {
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cnfe.printStackTrace();
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}
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}
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catch (ClassNotFoundException cnfe) {
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cnfe.printStackTrace();
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}
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else if (parser.getName().equals("extensionProvider")) {
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parser.next();
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parser.next();
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String elementName = parser.nextText();
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parser.next();
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parser.next();
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String namespace = parser.nextText();
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parser.next();
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parser.next();
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String className = parser.nextText();
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// Only add the provider for the namespace if one isn't
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// already registered.
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String key = getProviderKey(elementName, namespace);
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if (!extensionProviders.containsKey(key)) {
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// Attempt to load the provider class and then create
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// a new instance if it's a Provider. Otherwise, if it's
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// a PacketExtension, add the class object itself and
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// then we'll use reflection later to create instances
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// of the class.
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try {
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// Add the provider to the map.
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Class provider = Class.forName(className);
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if (PacketExtensionProvider.class.isAssignableFrom(
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provider))
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{
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extensionProviders.put(key, provider.newInstance());
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}
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else if (PacketExtension.class.isAssignableFrom(
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provider))
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{
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extensionProviders.put(key, provider);
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}
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}
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catch (ClassNotFoundException cnfe) {
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cnfe.printStackTrace();
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}
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}
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}
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}
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else if (parser.getName().equals("extensionProvider")) {
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parser.next();
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parser.next();
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String elementName = parser.nextText();
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parser.next();
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parser.next();
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String namespace = parser.nextText();
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parser.next();
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parser.next();
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String className = parser.nextText();
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// Only add the provider for the namespace if one isn't
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// already registered.
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String key = getProviderKey(elementName, namespace);
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if (!extensionProviders.containsKey(key)) {
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// Attempt to load the provider class and then create
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// a new instance if it's a Provider. Otherwise, if it's
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// a PacketExtension, add the class object itself and
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// then we'll use reflection later to create instances
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// of the class.
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try {
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// Add the provider to the map.
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Class provider = Class.forName(className);
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if (PacketExtensionProvider.class.isAssignableFrom(provider)) {
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extensionProviders.put(key, provider.newInstance());
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}
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else if (PacketExtension.class.isAssignableFrom(provider)) {
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extensionProviders.put(key, provider);
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}
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}
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catch (ClassNotFoundException cnfe) {
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cnfe.printStackTrace();
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}
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}
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}
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}
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eventType = parser.next();
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} while (eventType != XmlPullParser.END_DOCUMENT);
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}
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finally {
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try { providerStream.close(); }
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catch (Exception e) { }
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eventType = parser.next();
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} while (eventType != XmlPullParser.END_DOCUMENT);
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}
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finally {
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try { providerStream.close(); }
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catch (Exception e) { }
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}
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}
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}
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}
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@ -344,4 +352,16 @@ public class ProviderManager {
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buf.append("<").append(elementName).append("/><").append(namespace).append("/>");
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return buf.toString();
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}
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private static ClassLoader[] getClassLoaders() {
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ClassLoader[] classLoaders = new ClassLoader[3];
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classLoaders[0] = new ProviderManager().getClass().getClassLoader();
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classLoaders[1] = Thread.currentThread().getContextClassLoader();
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classLoaders[2] = Object.class.getClassLoader();
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return classLoaders;
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}
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private ProviderManager() {
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}
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}
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