/*******************************************************************************
* Copyright (c) 2009 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:
* Red Hat, Inc. - initial API and implementation
******************************************************************************/
package org.jboss.tools.common.el.core.resolver;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
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.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import org.jboss.tools.common.el.core.ELCorePlugin;
/**
* This factory is used to get EL Resources for particular resource
* which are plug in via org.jboss.tools.common.el.core.elResolver extension point.
* @author Alexey Kazakov
*/
public class ELResolverFactoryManager {
private static final ELResolverFactoryManager INSTANCE = new ELResolverFactoryManager();
static HashMap<String, Set<ELResolver>> resolversByNature;
static Set<ELResolverFactory> resolverFactories;
private ELResolverFactoryManager() {
}
/**
* Returns an instance of factory manager
* @return
*/
public static ELResolverFactoryManager getInstance() {
return INSTANCE;
}
private synchronized void init() {
if(resolversByNature==null) {
resolversByNature = new HashMap<String, Set<ELResolver>>();
resolverFactories = new HashSet<ELResolverFactory>();
IExtensionRegistry registry = Platform.getExtensionRegistry();
IExtensionPoint extensionPoint = registry.getExtensionPoint("org.jboss.tools.common.el.core.elResolver"); //$NON-NLS-1$
IExtension[] extensions = extensionPoint.getExtensions();
for (int i=0; i<extensions.length; i++) {
IExtension extension = extensions[i];
IConfigurationElement[] elements = extension.getConfigurationElements();
for(int j=0; j<elements.length; j++) {
IConfigurationElement[] natures = elements[j].getChildren("project-nature"); //$NON-NLS-1$
for (int k = 0; k < natures.length; k++) {
String natureId = natures[k].getAttribute("id"); //$NON-NLS-1$
try {
Object resolver = natures[k].createExecutableExtension("resolver-class"); //$NON-NLS-1$
if(resolver instanceof ELResolver) {
Set<ELResolver> resolverSet = resolversByNature.get(natureId);
if(resolverSet==null) {
resolverSet = new HashSet<ELResolver>();
resolversByNature.put(natureId, resolverSet);
}
resolverSet.add((ELResolver)resolver);
} else {
ELCorePlugin.getPluginLog().logError(resolver.getClass().getName() + " must be instance of org.jboss.tools.common.el.core.resolver.ELResolver"); //$NON-NLS-1$
}
} catch (CoreException e) {
ELCorePlugin.getPluginLog().logError(e);
}
}
IConfigurationElement[] factories = elements[j].getChildren("factory"); //$NON-NLS-1$
for (int k = 0; k < factories.length; k++) {
try {
Object factory = factories[k].createExecutableExtension("class"); //$NON-NLS-1$
if(factory instanceof ELResolverFactory) {
resolverFactories.add((ELResolverFactory)factory);
} else if(!(factory instanceof TestELResolverFactory)) {
ELCorePlugin.getPluginLog().logError(factory.getClass().getName() + " must be instance of org.jboss.tools.common.el.core.resolver.ELResolverFactory"); //$NON-NLS-1$
}
} catch (CoreException e) {
ELCorePlugin.getPluginLog().logError(e);
}
}
}
}
}
}
/**
* Returns all EL resolvers for the resource
* @param resource
* @return
*/
public ELResolver[] getResolvers(IResource resource) {
if(resource == null || !resource.isAccessible()) {
return new ELResolver[0];
}
IProject project = resource.getProject();
if (project == null || !project.isAccessible()) {
return new ELResolver[0];
}
init();
Set<ELResolver> resolverSet = new HashSet<ELResolver>();
Set<String> ids = resolversByNature.keySet();
for (String natureId : ids) {
try {
if(project.hasNature(natureId)) {
resolverSet.addAll(resolversByNature.get(natureId));
}
} catch (CoreException e) {
ELCorePlugin.getPluginLog().logError(e);
}
}
for (ELResolverFactory factory : resolverFactories) {
ELResolver resolver = factory.createResolver(resource);
if(resolver!=null) {
resolverSet.add(resolver);
}
}
return resolverSet.toArray(new ELResolver[resolverSet.size()]);
}
}