/*******************************************************************************
* Copyright (c) 2004 Peter Nehrer and Composent, Inc.
* 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:
* Peter Nehrer - initial API and implementation
*******************************************************************************/
package org.eclipse.ecf.sdo;
import java.io.PrintStream;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionDelta;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.IRegistryChangeEvent;
import org.eclipse.core.runtime.IRegistryChangeListener;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Plugin;
import org.eclipse.core.runtime.Status;
import org.osgi.framework.BundleContext;
import org.osgi.util.tracker.ServiceTracker;
/**
* @author pnehrer
*/
public class SDOPlugin {
public static final String PLUGIN_ID = "org.eclipse.ecf.sdo";
private static final String TRACE_PREFIX = PLUGIN_ID + "/";
private static EclipsePlugin plugin;
private static boolean tracingEnabled = Boolean.getBoolean(TRACE_PREFIX
+ "debug");
private SDOPlugin() {
}
public static void log(Object entry) {
if (plugin == null) {
if (entry instanceof Throwable)
((Throwable) entry).printStackTrace();
else
System.err.println(entry);
} else {
plugin.log(entry);
}
}
public static boolean isTracing(String tag) {
if (tracingEnabled) {
return plugin == null ? Boolean.getBoolean(TRACE_PREFIX + tag)
: plugin.isTracing(tag);
} else
return false;
}
public static PrintStream getTraceLog() {
return System.out;
}
public static class EclipsePlugin extends Plugin {
private static final String MANAGER_EXTENSION_POINT = "manager";
private static final String MANAGER_EXTENSION = "manager";
private static final String ATTR_NAME = "name";
private static final String ATTR_CLASS = "class";
private IRegistryChangeListener registryChangeListener;
private ServiceTracker extensionRegistryTracker = null;
public EclipsePlugin() {
plugin = this;
tracingEnabled = Platform.inDebugMode();
}
public IExtensionRegistry getExtensionRegistry() {
return (IExtensionRegistry) extensionRegistryTracker.getService();
}
/**
* This method is called upon plug-in activation
*/
public void start(BundleContext context) throws Exception {
super.start(context);
this.extensionRegistryTracker = new ServiceTracker(context,
IExtensionRegistry.class.getName(), null);
this.extensionRegistryTracker.open();
IExtensionRegistry reg = getExtensionRegistry();
if (reg != null) {
registryChangeListener = new IRegistryChangeListener() {
public void registryChanged(IRegistryChangeEvent event) {
IExtensionDelta[] deltas = event.getExtensionDeltas(
getBundle().getSymbolicName(),
MANAGER_EXTENSION_POINT);
for (int i = 0; i < deltas.length; ++i) {
switch (deltas[i].getKind()) {
case IExtensionDelta.ADDED:
registerManagers(deltas[i].getExtension()
.getConfigurationElements());
break;
case IExtensionDelta.REMOVED:
IConfigurationElement[] elems = deltas[i]
.getExtension().getConfigurationElements();
for (int j = 0; j < elems.length; ++j) {
if (!MANAGER_EXTENSION.equals(elems[j]
.getName()))
continue;
String name = elems[j].getAttribute(ATTR_NAME);
if (name != null && name.length() > 0)
DataGraphSharingFactory
.unregisterManager(name);
}
break;
}
}
}
};
IConfigurationElement[] elems = reg.getConfigurationElementsFor(
getBundle().getSymbolicName(), MANAGER_EXTENSION_POINT);
registerManagers(elems);
}
}
private void registerManagers(IConfigurationElement[] elems) {
for (int i = 0; i < elems.length; ++i) {
if (!MANAGER_EXTENSION.equals(elems[i].getName()))
continue;
String name = elems[i].getAttribute(ATTR_NAME);
if (name == null || name.length() == 0)
continue;
IDataGraphSharingManager mgr;
try {
mgr = (IDataGraphSharingManager) elems[i]
.createExecutableExtension(ATTR_CLASS);
} catch (Exception ex) {
continue;
}
DataGraphSharingFactory.registerManager(name, mgr);
}
}
/**
* This method is called when the plug-in is stopped
*/
public void stop(BundleContext context) throws Exception {
IExtensionRegistry reg = getExtensionRegistry();
if (reg != null && registryChangeListener != null)
reg.removeRegistryChangeListener(
registryChangeListener);
DataGraphSharingFactory.unregisterAllManagers();
if (extensionRegistryTracker != null) {
extensionRegistryTracker.close();
extensionRegistryTracker = null;
}
super.stop(context);
}
public void log(Object entry) {
IStatus status;
if (entry instanceof IStatus)
status = (IStatus) entry;
else if (entry instanceof CoreException)
status = ((CoreException) entry).getStatus();
else if (entry instanceof Throwable) {
Throwable t = (Throwable) entry;
status = new Status(Status.ERROR,
getBundle().getSymbolicName(), 0,
t.getLocalizedMessage() == null ? "Unknown error." : t
.getLocalizedMessage(), t);
} else
status = new Status(Status.WARNING, getBundle()
.getSymbolicName(), 0, String.valueOf(entry),
new RuntimeException().fillInStackTrace());
getLog().log(status);
}
public boolean isTracing(String tag) {
return Boolean.TRUE.equals(Boolean.valueOf(Platform
.getDebugOption(TRACE_PREFIX + tag)));
}
}
}