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/*******************************************************************************
* Copyright (c) 2011 Wind River Systems, Inc. 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.runtime.statushandler.internal;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.eclipse.core.expressions.EvaluationContext;
import org.eclipse.core.expressions.EvaluationResult;
import org.eclipse.core.expressions.Expression;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager;
import org.eclipse.tcf.te.runtime.extensions.ExecutableExtensionProxy;
import org.eclipse.tcf.te.runtime.statushandler.activator.CoreBundleActivator;
/**
* Status handler binding extension point manager implementation.
*/
public class StatusHandlerBindingExtensionPointManager extends AbstractExtensionPointManager<StatusHandlerBinding> {
/*
* Thread save singleton instance creation.
*/
private static class LazyInstance {
public static StatusHandlerBindingExtensionPointManager instance = new StatusHandlerBindingExtensionPointManager();
}
/**
* Constructor.
*/
StatusHandlerBindingExtensionPointManager() {
super();
}
/**
* Returns the singleton instance of the extension point manager.
*/
public static StatusHandlerBindingExtensionPointManager getInstance() {
return LazyInstance.instance;
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager#getExtensionPointId()
*/
@Override
protected String getExtensionPointId() {
return "org.eclipse.tcf.te.runtime.statushandler.bindings"; //$NON-NLS-1$
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager#getConfigurationElementName()
*/
@Override
protected String getConfigurationElementName() {
return "binding"; //$NON-NLS-1$
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager#doCreateExtensionProxy(org.eclipse.core.runtime.IConfigurationElement)
*/
@Override
protected ExecutableExtensionProxy<StatusHandlerBinding> doCreateExtensionProxy(IConfigurationElement element) throws CoreException {
return new ExecutableExtensionProxy<StatusHandlerBinding>(element) {
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.extensions.ExecutableExtensionProxy#newInstance()
*/
@Override
public StatusHandlerBinding newInstance() {
StatusHandlerBinding instance = new StatusHandlerBinding();
try {
instance.setInitializationData(getConfigurationElement(), null, null);
} catch (CoreException e) {
IStatus status = new Status(IStatus.ERROR, CoreBundleActivator.getUniqueIdentifier(),
e.getLocalizedMessage(), e);
Platform.getLog(CoreBundleActivator.getContext().getBundle()).log(status);
}
return instance;
}
};
}
/**
* Returns the applicable status handler bindings for the given handler context.
*
* @param context The handler context or <code>null</code>.
* @return The list of applicable editor page bindings or an empty array.
*/
public StatusHandlerBinding[] getApplicableBindings(Object context) {
List<StatusHandlerBinding> applicable = new ArrayList<StatusHandlerBinding>();
for (StatusHandlerBinding binding : getBindings()) {
Expression enablement = binding.getEnablement();
// The binding is applicable by default if no expression is specified.
boolean isApplicable = enablement == null;
if (enablement != null) {
if (context != null) {
// Set the default variable to the handler context.
EvaluationContext evalContext = new EvaluationContext(null, context);
evalContext.addVariable("context", context); //$NON-NLS-1$
// Allow plugin activation
evalContext.setAllowPluginActivation(true);
// Evaluate the expression
try {
isApplicable = enablement.evaluate(evalContext).equals(EvaluationResult.TRUE);
} catch (CoreException e) {
IStatus status = new Status(IStatus.ERROR, CoreBundleActivator.getUniqueIdentifier(),
e.getLocalizedMessage(), e);
Platform.getLog(CoreBundleActivator.getContext().getBundle()).log(status);
}
} else {
// The enablement is false by definition if no handler context is given.
isApplicable = false;
}
}
// Add the binding if applicable
if (isApplicable) {
applicable.add(binding);
}
}
return applicable.toArray(new StatusHandlerBinding[applicable.size()]);
}
/**
* Returns the list of all contributed status handler bindings.
*
* @return The list of contributed status handler bindings, or an empty array.
*/
public StatusHandlerBinding[] getBindings() {
List<StatusHandlerBinding> contributions = new ArrayList<StatusHandlerBinding>();
Collection<ExecutableExtensionProxy<StatusHandlerBinding>> statusHandlerBindings = getExtensions().values();
for (ExecutableExtensionProxy<StatusHandlerBinding> statusHandlerBinding : statusHandlerBindings) {
StatusHandlerBinding instance = statusHandlerBinding.getInstance();
if (instance != null && !contributions.contains(instance)) {
contributions.add(instance);
}
}
return contributions.toArray(new StatusHandlerBinding[contributions.size()]);
}
/**
* Returns the status handler binding identified by its unique id. If no status
* handler binding with the specified id is registered, <code>null</code> is returned.
*
* @param id The unique id of the status handler binding or <code>null</code>
*
* @return The status handler binding instance or <code>null</code>.
*/
public StatusHandlerBinding getBinding(String id) {
StatusHandlerBinding contribution = null;
if (getExtensions().containsKey(id)) {
ExecutableExtensionProxy<StatusHandlerBinding> proxy = getExtensions().get(id);
// Get the extension instance
contribution = proxy.getInstance();
}
return contribution;
}
}
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