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/*
* Copyright (c) 2015 Eike Stepper (Berlin, 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;
import org.eclipse.emf.cdo.eresource.CDOResource;
import org.eclipse.emf.cdo.eresource.CDOResourceNode;
import org.eclipse.emf.cdo.util.CDOUtil;
import org.eclipse.emf.cdo.view.CDOView;
import org.eclipse.net4j.util.AdapterUtil;
import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.notify.Notifier;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.emf.spi.cdo.FSMUtil;
import org.eclipse.emf.spi.cdo.InternalCDOObject;
import org.eclipse.core.runtime.IAdaptable;
import java.util.ArrayList;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
import java.util.List;
/**
* @author Eike Stepper
* @since 4.4
*/
public class CDOElement extends AdapterImpl implements IAdaptable
{
private static final Class<CDOElement> TYPE = CDOElement.class;
private final EObject delegate;
private final List<Object> children = new ArrayList<Object>();
public CDOElement(EObject delegate)
{
this.delegate = (EObject)getInstance(delegate);
}
public Object getDelegate()
{
return delegate;
}
public Object getParent()
{
return CDOElement.getParentOf(delegate);
}
public Object[] getChildren()
{
return children.toArray();
}
public boolean hasChildren()
{
return !children.isEmpty();
}
public void addChild(Object child)
{
child = getInstance(child);
EList<Adapter> adapters = removeFrom(child);
if (adapters != null)
{
synchronized (TYPE)
{
adapters.add(this);
}
}
children.add(child);
}
public void reset()
{
children.clear();
}
@Override
public boolean isAdapterForType(Object type)
{
return type == TYPE;
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public Object getAdapter(Class adapter)
{
if (adapter == EObject.class)
{
return delegate;
}
return AdapterUtil.adapt(this, adapter, false);
}
public String toString(Object child)
{
return child.toString();
}
@Override
public String toString()
{
return delegate.toString();
}
public static EObject getParentOf(EObject eObject)
{
if (eObject == null)
{
return null;
}
CDOObject cdoObject = CDOUtil.getCDOObject(eObject, false);
if (cdoObject != null
&& (FSMUtil.isInvalid(cdoObject) || cdoObject.cdoView() == null || cdoObject.cdoView().isClosed()))
{
return null;
}
EObject container = eObject.eContainer();
if (container != null)
{
return container;
}
if (eObject instanceof CDOResource)
{
CDOResource resource = (CDOResource)eObject;
if (resource.isRoot())
{
return null;
}
}
Resource resource = eObject.eResource();
if (resource instanceof CDOResource)
{
return (CDOResource)resource;
}
if (eObject instanceof CDOResourceNode)
{
CDOView view = ((CDOResourceNode)eObject).cdoView();
if (view != null)
{
return view.getRootResource();
}
}
return null;
}
public static CDOElement getFor(Object object)
{
if (object instanceof Notifier)
{
Notifier notifier = (Notifier)object;
return (CDOElement)EcoreUtil.getExistingAdapter(notifier, TYPE);
}
return null;
}
public static EList<Adapter> removeFrom(Object object)
{
if (object instanceof EObject)
{
EObject eObject = (EObject)object;
EList<Adapter> adapters = eObject.eAdapters();
synchronized (TYPE)
{
removeSafe(adapters);
}
return adapters;
}
return null;
}
private static void removeSafe(EList<Adapter> adapters)
{
try
{
for (Iterator<Adapter> it = adapters.iterator(); it.hasNext();)
{
Adapter adapter = it.next();
if (adapter.isAdapterForType(TYPE))
{
it.remove();
}
}
}
catch (ConcurrentModificationException ex)
{
removeSafe(adapters);
}
}
private static Object getInstance(Object object)
{
if (object instanceof InternalCDOObject)
{
InternalCDOObject cdoObject = (InternalCDOObject)object;
object = cdoObject.cdoInternalInstance();
}
return object;
}
/**
* @author Eike Stepper
* @since 4.4
*/
public interface StateProvider
{
public CDOState getState(Object object);
}
}
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