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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.ui.terminals.launcher;
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.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager;
import org.eclipse.tcf.te.runtime.extensions.ExecutableExtensionProxy;
import org.eclipse.tcf.te.ui.terminals.activator.UIPlugin;
import org.eclipse.tcf.te.ui.terminals.interfaces.ILauncherDelegate;
import org.eclipse.ui.ISources;
/**
* Terminal launcher delegate manager implementation.
*/
public class LauncherDelegateManager extends AbstractExtensionPointManager<ILauncherDelegate> {
/*
* Thread save singleton instance creation.
*/
private static class LazyInstanceHolder {
public static LauncherDelegateManager instance = new LauncherDelegateManager();
}
/**
* Returns the singleton instance.
*/
public static LauncherDelegateManager getInstance() {
return LazyInstanceHolder.instance;
}
/**
* Constructor.
*/
LauncherDelegateManager() {
super();
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager#getExtensionPointId()
*/
@Override
protected String getExtensionPointId() {
return "org.eclipse.tcf.te.ui.terminals.launcherDelegates"; //$NON-NLS-1$
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.extensions.AbstractExtensionPointManager#getConfigurationElementName()
*/
@Override
protected String getConfigurationElementName() {
return "delegate"; //$NON-NLS-1$
}
/**
* Returns the list of all contributed terminal launcher delegates.
*
* @param unique If <code>true</code>, the method returns new instances for each
* contributed terminal launcher delegate.
*
* @return The list of contributed terminal launcher delegates, or an empty array.
*/
public ILauncherDelegate[] getLauncherDelegates(boolean unique) {
List<ILauncherDelegate> contributions = new ArrayList<ILauncherDelegate>();
Collection<ExecutableExtensionProxy<ILauncherDelegate>> launcherDelegates = getExtensions().values();
for (ExecutableExtensionProxy<ILauncherDelegate> launcherDelegate : launcherDelegates) {
ILauncherDelegate instance = unique ? launcherDelegate.newInstance() : launcherDelegate.getInstance();
if (instance != null && !contributions.contains(instance)) {
contributions.add(instance);
}
}
return contributions.toArray(new ILauncherDelegate[contributions.size()]);
}
/**
* Returns the terminal launcher delegate identified by its unique id. If no terminal
* launcher delegate with the specified id is registered, <code>null</code> is returned.
*
* @param id The unique id of the terminal launcher delegate or <code>null</code>
* @param unique If <code>true</code>, the method returns new instances of the terminal launcher delegate contribution.
*
* @return The terminal launcher delegate instance or <code>null</code>.
*/
public ILauncherDelegate getLauncherDelegate(String id, boolean unique) {
ILauncherDelegate contribution = null;
if (getExtensions().containsKey(id)) {
ExecutableExtensionProxy<ILauncherDelegate> proxy = getExtensions().get(id);
// Get the extension instance
contribution = unique ? proxy.newInstance() : proxy.getInstance();
}
return contribution;
}
/**
* Returns the applicable terminal launcher delegates for the given selection.
*
* @param selection The selection or <code>null</code>.
* @return The list of applicable terminal launcher delegates or an empty array.
*/
public ILauncherDelegate[] getApplicableLauncherDelegates(ISelection selection) {
List<ILauncherDelegate> applicable = new ArrayList<ILauncherDelegate>();
for (ILauncherDelegate delegate : getLauncherDelegates(false)) {
Expression enablement = delegate.getEnablement();
// The launcher delegate is applicable by default if
// no expression is specified.
boolean isApplicable = enablement == null;
if (enablement != null) {
if (selection != null) {
// Set the default variable to selection.
EvaluationContext context = new EvaluationContext(null, selection);
// Set the "selection" variable to the selection.
context.addVariable(ISources.ACTIVE_CURRENT_SELECTION_NAME, selection);
// Allow plugin activation
context.setAllowPluginActivation(true);
// Evaluate the expression
try {
isApplicable = enablement.evaluate(context).equals(EvaluationResult.TRUE);
} catch (CoreException e) {
IStatus status = new Status(IStatus.ERROR, UIPlugin.getUniqueIdentifier(),
e.getLocalizedMessage(), e);
UIPlugin.getDefault().getLog().log(status);
}
} else {
// The enablement is false by definition if
// there is no selection.
isApplicable = false;
}
}
// Add the page if applicable
if (isApplicable) applicable.add(delegate);
}
return applicable.toArray(new ILauncherDelegate[applicable.size()]);
}
}
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