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/*
* Copyright (c) 2015, 2016, 2019 Eike Stepper (Loehne, Germany) 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:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.explorer.ui.checkouts;
import org.eclipse.emf.cdo.CDOElement;
import org.eclipse.emf.cdo.explorer.ui.bundle.OM;
import org.eclipse.emf.cdo.util.ObjectNotFoundException;
import org.eclipse.net4j.util.container.IContainerDelta;
import org.eclipse.net4j.util.container.IContainerEvent;
import org.eclipse.net4j.util.container.IPluginContainer;
import org.eclipse.net4j.util.event.IEvent;
import org.eclipse.net4j.util.event.IListener;
import org.eclipse.net4j.util.factory.IFactory;
import org.eclipse.net4j.util.factory.IFactoryKey;
import org.eclipse.net4j.util.factory.ProductCreationException;
import org.eclipse.net4j.util.lifecycle.ILifecycleEvent;
import org.eclipse.net4j.util.registry.IRegistry;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* @author Eike Stepper
*/
public interface CDOCheckoutContentModifier
{
public Object[] modifyChildren(Object parent, Object[] children);
/**
* @author Eike Stepper
*/
public static abstract class Factory extends org.eclipse.net4j.util.factory.Factory
{
public static final String PRODUCT_GROUP = "org.eclipse.emf.cdo.explorer.ui.checkouts.contentModifiers";
public Factory(String type)
{
super(PRODUCT_GROUP, type);
}
@Override
public abstract CDOCheckoutContentModifier create(String description) throws ProductCreationException;
}
/**
* @author Eike Stepper
*/
public static final class Registry implements CDOCheckoutContentModifier, IListener
{
public static final Registry INSTANCE = new Registry();
private final Map<String, CDOCheckoutContentModifier> modifiers = new LinkedHashMap<>();
private Registry()
{
IRegistry<IFactoryKey, IFactory> factories = IPluginContainer.INSTANCE.getFactoryRegistry();
for (Map.Entry<IFactoryKey, IFactory> entry : factories.getElements())
{
updateModifiers(entry, IContainerDelta.Kind.ADDED);
}
factories.addListener(this);
}
private List<CDOCheckoutContentModifier> getModifiers()
{
synchronized (modifiers)
{
if (modifiers.isEmpty())
{
return null;
}
return new ArrayList<>(modifiers.values());
}
}
@Override
public Object[] modifyChildren(Object parent, Object[] children)
{
List<CDOCheckoutContentModifier> modifiers = getModifiers();
if (modifiers != null)
{
for (int i = 0; i < children.length; i++)
{
Object child = children[i];
CDOElement.removeFrom(child);
}
for (CDOCheckoutContentModifier modifier : modifiers)
{
try
{
children = modifier.modifyChildren(parent, children);
}
catch (ObjectNotFoundException ex)
{
// Do nothing
}
catch (Exception ex)
{
OM.LOG.error(ex);
}
}
}
return children;
}
@Override
public void notifyEvent(IEvent event)
{
if (event instanceof IContainerEvent)
{
@SuppressWarnings("unchecked")
IContainerEvent<Map.Entry<IFactoryKey, IFactory>> e = (IContainerEvent<Map.Entry<IFactoryKey, IFactory>>)event;
for (IContainerDelta<Map.Entry<IFactoryKey, IFactory>> delta : e.getDeltas())
{
Map.Entry<IFactoryKey, IFactory> entry = delta.getElement();
updateModifiers(entry, delta.getKind());
}
}
else if (event instanceof ILifecycleEvent)
{
ILifecycleEvent e = (ILifecycleEvent)event;
if (e.getKind() == ILifecycleEvent.Kind.DEACTIVATED)
{
IPluginContainer.INSTANCE.getFactoryRegistry().removeListener(this);
synchronized (modifiers)
{
modifiers.clear();
}
}
}
}
private void updateModifiers(Map.Entry<IFactoryKey, IFactory> entry, IContainerDelta.Kind deltaKind)
{
try
{
IFactoryKey key = entry.getKey();
if (Factory.PRODUCT_GROUP.equals(key.getProductGroup()))
{
String type = key.getType();
if (deltaKind == IContainerDelta.Kind.ADDED)
{
CDOCheckoutContentModifier modifier = (CDOCheckoutContentModifier)IPluginContainer.INSTANCE.getElement(Factory.PRODUCT_GROUP, type, null);
synchronized (modifiers)
{
modifiers.put(type, modifier);
}
}
else
{
synchronized (modifiers)
{
modifiers.remove(type);
}
}
}
}
catch (Exception ex)
{
OM.LOG.error(ex);
}
}
}
}
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