/*******************************************************************************
* Copyright (c) 2007 Exadel, Inc. and Red Hat, Inc.
* Distributed under license by Red Hat, Inc. All rights reserved.
* This program is 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:
* Exadel, Inc. and Red Hat, Inc. - initial API and implementation
******************************************************************************/
package org.jboss.tools.common.model.util;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.InvalidRegistryObjectException;
import org.eclipse.core.runtime.Platform;
import org.jboss.tools.common.model.XModelObject;
import org.jboss.tools.common.model.plugin.ModelPlugin;
import org.osgi.framework.Bundle;
/**
* TODO use IExecutableExtension and IExecutableExtensionFactory
*
* @author Slava kabanovich
*
*/
public class ModelFeatureFactory {
public static final String POINT = "org.jboss.tools.common.model.classes"; //$NON-NLS-1$
public static ModelFeatureFactory getInstance() {
return ModelFeatureFactoryHolder.INSTANCE;
}
private Map<String,IConfigurationElement> elements = new HashMap<String, IConfigurationElement>();
private Set<String> instanceFailures = new HashSet<String>();
private Set<String> classFailures = new HashSet<String>();
private ModelFeatureFactory() {
init();
}
private void init() {
IExtensionPoint point = Platform.getExtensionRegistry().getExtensionPoint(POINT);
IExtension[] es = point.getExtensions();
for (int i = 0; i < es.length; i++) {
IConfigurationElement[] cs = es[i].getConfigurationElements();
for (int j = 0; j < cs.length; j++) {
String id = cs[j].getAttribute("id"); //$NON-NLS-1$
elements.put(id, cs[j]);
}
}
}
private boolean isActive() {
Bundle b = Platform.getBundle("org.jboss.tools.common.model"); //$NON-NLS-1$
int state = b == null ? -1 : b.getState() ;
return state == Bundle.ACTIVE;
}
public Object createFeatureInstance(String id) {
if(instanceFailures.contains(id)) return null;
IConfigurationElement c = elements.get(id);
if(c == null) {
instanceFailures.add(id);
classFailures.add(id);
ModelPlugin.getPluginLog().logError(new Exception("Model feature " + id + " is not registered with extension point " + POINT)); //$NON-NLS-1$ //$NON-NLS-2$
return null;
}
try {
return c.createExecutableExtension("class"); //$NON-NLS-1$
} catch (CoreException e) {
instanceFailures.add(id);
ModelPlugin.getPluginLog().logError("Cannot create model feature instance " + id + ".", e); //$NON-NLS-1$ //$NON-NLS-2$
} catch (InvalidRegistryObjectException e) {
instanceFailures.add(id);
ModelPlugin.getPluginLog().logError("Cannot create model feature instance " + id + ".", e); //$NON-NLS-1$ //$NON-NLS-2$
}
return null;
}
public Class getFeatureClass(String id) {
if(classFailures.contains(id)) return null;
IConfigurationElement c = elements.get(id);
if(c == null) {
classFailures.add(id);
instanceFailures.add(id);
ModelPlugin.getPluginLog().logError(new Exception("Model feature " + id + " is not registered with extension point " + POINT)); //$NON-NLS-1$ //$NON-NLS-2$
return null;
}
try {
String n = c.getNamespaceIdentifier();
Bundle b = Platform.getBundle(n);
String cls = c.getAttribute("class"); //$NON-NLS-1$
return b.loadClass(cls);
} catch (ClassNotFoundException e) {
classFailures.add(id);
if(!isActive()) return null;
ModelPlugin.getPluginLog().logError("Cannot create model feature class " + c.getAttribute("class") + ".", e); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
return null;
}
public XModelObject createXModelObjectInstance(String id) {
Object o = createFeatureInstance(id);
if(o == null) return null;
try {
return (XModelObject)o;
} catch (ClassCastException e) {
instanceFailures.add(id);
ModelPlugin.getPluginLog().logError("Model feature " + id + " is not instance of XModelObject", e); //$NON-NLS-1$ //$NON-NLS-2$
return null;
}
}
public static class ModelFeatureFactoryHolder {
public static final ModelFeatureFactory INSTANCE = new ModelFeatureFactory();
}
}