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/*******************************************************************************
* Copyright (c) 2003, 2010 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.framework.internal.protocol;
import java.lang.reflect.Method;
import java.net.ContentHandler;
import java.net.URLConnection;
import java.util.*;
import org.eclipse.osgi.framework.adaptor.FrameworkAdaptor;
import org.eclipse.osgi.framework.internal.core.Msg;
import org.eclipse.osgi.framework.log.FrameworkLogEntry;
import org.eclipse.osgi.util.NLS;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.service.url.URLConstants;
import org.osgi.util.tracker.ServiceTracker;
/**
* The ContentHandlerFactory is registered with the JVM to provide content handlers
* to requestors. The ContentHandlerFactory will first look for built-in content handlers.
* If a built in handler exists, this factory will return null. Otherwise, this ContentHandlerFactory
* will search the service registry for a maching Content-Handler and, if found, return a
* proxy for that content handler.
*/
// TODO rename this class!!! its really confusing to name the impl the same as the interface
public class ContentHandlerFactory extends MultiplexingFactory implements java.net.ContentHandlerFactory {
private ServiceTracker<ContentHandler, ContentHandler> contentHandlerTracker;
private static final String contentHandlerClazz = "java.net.ContentHandler"; //$NON-NLS-1$
private static final String CONTENT_HANDLER_PKGS = "java.content.handler.pkgs"; //$NON-NLS-1$
private static final String DEFAULT_VM_CONTENT_HANDLERS = "sun.net.www.content"; //$NON-NLS-1$
private static final List<Class<?>> ignoredClasses = Arrays.asList(new Class<?>[] {MultiplexingContentHandler.class, ContentHandlerFactory.class, URLConnection.class});
private Map<String, ContentHandlerProxy> proxies;
private java.net.ContentHandlerFactory parentFactory;
public ContentHandlerFactory(BundleContext context, FrameworkAdaptor adaptor) {
super(context, adaptor);
proxies = new Hashtable<String, ContentHandlerProxy>(5);
//We need to track content handler registrations
contentHandlerTracker = new ServiceTracker<ContentHandler, ContentHandler>(context, contentHandlerClazz, null);
contentHandlerTracker.open();
}
/**
* @see java.net.ContentHandlerFactory#createContentHandler(String)
*/
//TODO method is too long... consider reducing indentation (returning quickly) and moving complex steps to private methods
public ContentHandler createContentHandler(String contentType) {
//first, we check to see if there exists a built in content handler for
//this content type. we can not overwrite built in ContentHandlers
String builtInHandlers = StreamHandlerFactory.secureAction.getProperty(CONTENT_HANDLER_PKGS);
builtInHandlers = builtInHandlers == null ? DEFAULT_VM_CONTENT_HANDLERS : DEFAULT_VM_CONTENT_HANDLERS + '|' + builtInHandlers;
Class<?> clazz = null;
if (builtInHandlers != null) {
//replace '/' with a '.' and all characters not allowed in a java class name
//with a '_'.
// find all characters not allowed in java names
String convertedContentType = contentType.replace('.', '_');
convertedContentType = convertedContentType.replace('/', '.');
convertedContentType = convertedContentType.replace('-', '_');
StringTokenizer tok = new StringTokenizer(builtInHandlers, "|"); //$NON-NLS-1$
while (tok.hasMoreElements()) {
StringBuffer name = new StringBuffer();
name.append(tok.nextToken());
name.append("."); //$NON-NLS-1$
name.append(convertedContentType);
try {
clazz = StreamHandlerFactory.secureAction.loadSystemClass(name.toString());
if (clazz != null) {
return (null); //this class exists, it is a built in handler, let the JVM handle it
}
} catch (ClassNotFoundException ex) {
//keep looking
}
}
}
if (isMultiplexing())
return new MultiplexingContentHandler(contentType, this);
return createInternalContentHandler(contentType);
}
public ContentHandler createInternalContentHandler(String contentType) {
//first check to see if the handler is in the cache
ContentHandlerProxy proxy = proxies.get(contentType);
if (proxy != null) {
return (proxy);
}
ServiceReference<ContentHandler>[] serviceReferences = contentHandlerTracker.getServiceReferences();
if (serviceReferences != null) {
for (int i = 0; i < serviceReferences.length; i++) {
Object prop = serviceReferences[i].getProperty(URLConstants.URL_CONTENT_MIMETYPE);
if (prop instanceof String)
prop = new String[] {(String) prop}; // TODO should this be a warning?
if (!(prop instanceof String[])) {
String message = NLS.bind(Msg.URL_HANDLER_INCORRECT_TYPE, new Object[] {URLConstants.URL_CONTENT_MIMETYPE, contentHandlerClazz, serviceReferences[i].getBundle()});
adaptor.getFrameworkLog().log(new FrameworkLogEntry(FrameworkAdaptor.FRAMEWORK_SYMBOLICNAME, FrameworkLogEntry.WARNING, 0, message, 0, null, null));
continue;
}
String[] contentHandler = (String[]) prop;
for (int j = 0; j < contentHandler.length; j++) {
if (contentHandler[j].equals(contentType)) {
proxy = new ContentHandlerProxy(contentType, serviceReferences[i], context);
proxies.put(contentType, proxy);
return (proxy);
}
}
}
}
// if parent is present do parent lookup before returning a proxy
if (parentFactory != null) {
ContentHandler parentHandler = parentFactory.createContentHandler(contentType);
if (parentHandler != null)
return parentHandler;
}
//If we can't find the content handler in the service registry, return Proxy with DefaultContentHandler set.
//We need to do this because if we return null, we won't get called again for this content type.
proxy = new ContentHandlerProxy(contentType, null, context);
proxies.put(contentType, proxy);
return (proxy);
}
public synchronized ContentHandler findAuthorizedContentHandler(String contentType) {
Object factory = findAuthorizedFactory(ignoredClasses);
if (factory == null)
return null;
if (factory == this)
return createInternalContentHandler(contentType);
try {
Method createInternalContentHandlerMethod = factory.getClass().getMethod("createInternalContentHandler", new Class[] {String.class}); //$NON-NLS-1$
return (ContentHandler) createInternalContentHandlerMethod.invoke(factory, new Object[] {contentType});
} catch (Exception e) {
adaptor.getFrameworkLog().log(new FrameworkLogEntry(ContentHandlerFactory.class.getName(), FrameworkLogEntry.ERROR, 0, "findAuthorizedContentHandler-loop", 0, e, null)); //$NON-NLS-1$
throw new RuntimeException(e.getMessage(), e);
}
}
public Object getParentFactory() {
return parentFactory;
}
public void setParentFactory(Object parentFactory) {
if (this.parentFactory == null) // only allow it to be set once
this.parentFactory = (java.net.ContentHandlerFactory) parentFactory;
}
}
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