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/*******************************************************************************
* Copyright (c) 2012, 2016 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.tcf.ui.internal;
import java.util.EventObject;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.core.expressions.IEvaluationContext;
import org.eclipse.swt.widgets.Display;
import org.eclipse.tcf.te.runtime.events.ChangeEvent;
import org.eclipse.tcf.te.runtime.events.EventManager;
import org.eclipse.tcf.te.runtime.interfaces.events.IEventListener;
import org.eclipse.tcf.te.runtime.services.ServiceManager;
import org.eclipse.tcf.te.tcf.locator.interfaces.nodes.IPeerNode;
import org.eclipse.tcf.te.tcf.locator.interfaces.services.IDefaultContextService;
import org.eclipse.ui.AbstractSourceProvider;
import org.eclipse.ui.ISources;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.services.IEvaluationService;
import org.eclipse.ui.services.IServiceLocator;
/**
* Source provider for peer nodes and default context implementation.
*/
public class SourceProvider extends AbstractSourceProvider implements IEventListener {
/**
* Source name identifying the System Manager view selection.
*/
public static final String defaultContextSelectionName = "defaultContextSelection"; //$NON-NLS-1$
// see org.eclipse.ui.internal.services.EvaluationService
private static final String RE_EVAL = "org.eclipse.ui.internal.services.EvaluationService.evaluate"; //$NON-NLS-1$
// The internal list of provided source names
private final static String[] PROVIDED_SOURCE_NAMES = {defaultContextSelectionName};
// The reference to the expression evaluation service
private IEvaluationService service = null;
private IPeerNode defaultContext;
private IPeerNode prevContext;
private volatile boolean changePending;
/**
* Constructor.
*/
public SourceProvider() {
super();
}
/* (non-Javadoc)
* @see org.eclipse.ui.AbstractSourceProvider#initialize(org.eclipse.ui.services.IServiceLocator)
*/
@Override
public void initialize(IServiceLocator locator) {
super.initialize(locator);
defaultContext = ServiceManager.getInstance().getService(IDefaultContextService.class).getDefaultContext(null);
EventManager.getInstance().addEventListener(this, ChangeEvent.class);
// Register the source provider with the expression evaluation service
if (locator.hasService(IEvaluationService.class)) {
service = (IEvaluationService)locator.getService(IEvaluationService.class);
if (service != null) service.addSourceProvider(this);
}
}
/* (non-Javadoc)
* @see org.eclipse.ui.ISourceProvider#dispose()
*/
@Override
public void dispose() {
EventManager.getInstance().removeEventListener(this);
// Unregister the source provider from the expression evaluation service
if (service != null) { service.removeSourceProvider(this); service = null; }
}
/* (non-Javadoc)
* @see org.eclipse.ui.ISourceProvider#getProvidedSourceNames()
*/
@Override
public String[] getProvidedSourceNames() {
return PROVIDED_SOURCE_NAMES;
}
/* (non-Javadoc)
* @see org.eclipse.ui.ISourceProvider#getCurrentState()
*/
@Override
public Map getCurrentState() {
Map<String, Object> state = new HashMap<String, Object>();
state.put(defaultContextSelectionName, defaultContext != null ? defaultContext : IEvaluationContext.UNDEFINED_VARIABLE);
return state;
}
/* (non-Javadoc)
* @see org.eclipse.tcf.te.runtime.interfaces.events.IEventListener#eventFired(java.util.EventObject)
*/
@Override
public void eventFired(EventObject event) {
if (event instanceof ChangeEvent) {
ChangeEvent changeEvent = (ChangeEvent)event;
if (changeEvent.getSource() instanceof IDefaultContextService || changeEvent.getSource() == defaultContext) {
defaultContext = ServiceManager.getInstance().getService(IDefaultContextService.class).getDefaultContext(null);
if (changePending || !PlatformUI.isWorkbenchRunning() || PlatformUI.getWorkbench().isClosing())
return;
changePending = true;
// Fire the source changed notification within the UI thread
final Display display = PlatformUI.getWorkbench().getDisplay();
display.asyncExec(new Runnable() {
private boolean scheduled;
@SuppressWarnings("synthetic-access")
@Override
public void run() {
if (service == null) return;
if (!scheduled) {
scheduled = true;
display.timerExec(100, this);
return;
}
IPeerNode newContext = defaultContext;
changePending = false;
if (newContext == prevContext) {
// force re-evaluation of enablement expressions
service.getCurrentState().addVariable(RE_EVAL, new Object());
} else
fireSourceChanged(ISources.WORKBENCH, defaultContextSelectionName, newContext != null ? newContext : IEvaluationContext.UNDEFINED_VARIABLE);
prevContext = newContext;
}
});
}
}
}
}
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