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/*******************************************************************************
* Copyright (c) 2012 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.ui.views.extensions;
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.expressions.ExpressionConverter;
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.jface.viewers.ILabelProvider;
import org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager;
import org.eclipse.tcf.te.runtime.extensions.ExecutableExtensionProxy;
import org.eclipse.tcf.te.ui.activator.UIPlugin;
/**
* Label Provider Delegate extension point manager implementation.
*/
public class LabelProviderDelegateExtensionPointManager extends AbstractExtensionPointManager<ILabelProvider> {
/*
* Thread save singleton instance creation.
*/
private static class LazyInstance {
public static LabelProviderDelegateExtensionPointManager instance = new LabelProviderDelegateExtensionPointManager();
}
/**
* Constructor.
*/
LabelProviderDelegateExtensionPointManager() {
super();
}
/**
* Returns the singleton instance of the extension point manager.
*/
public static LabelProviderDelegateExtensionPointManager getInstance() {
return LazyInstance.instance;
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager#getExtensionPointId()
*/
@Override
protected String getExtensionPointId() {
return "org.eclipse.tcf.te.ui.views.labelProviderDelegates"; //$NON-NLS-1$
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager#getConfigurationElementName()
*/
@Override
protected String getConfigurationElementName() {
return "labelProviderDelegate"; //$NON-NLS-1$
}
/**
* Returns the list of all contributed label provider delegates.
*
* @param unique If <code>true</code>, the method returns new instances for each
* contributed label provider delegate.
*
* @return The list of contributed label provider delegates, or an empty array.
*/
public ILabelProvider[] getDelegates(Object context, boolean unique) {
List<ILabelProvider> contributions = new ArrayList<ILabelProvider>();
Collection<ExecutableExtensionProxy<ILabelProvider>> delegates = getExtensions().values();
for (ExecutableExtensionProxy<ILabelProvider> delegate : delegates) {
Expression enablement = null;
// Read the sub elements of the extension
IConfigurationElement[] children = delegate != null ? delegate.getConfigurationElement().getChildren() : null;
// The "enablement" element is the only expected one
if (children != null && children.length > 0) {
try {
enablement = ExpressionConverter.getDefault().perform(children[0]);
}
catch (CoreException e) {}
}
// 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 delegate 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, UIPlugin.getUniqueIdentifier(),
e.getLocalizedMessage(), e);
Platform.getLog(UIPlugin.getDefault().getBundle()).log(status);
}
} else {
// The enablement is false by definition if no delegate context is given.
isApplicable = false;
}
}
if (isApplicable) {
ILabelProvider instance = unique ? delegate.newInstance() : delegate.getInstance();
if (instance != null && !contributions.contains(instance)) {
contributions.add(instance);
}
}
}
return contributions.toArray(new ILabelProvider[contributions.size()]);
}
}
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