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/***************************************************************************
* Copyright (c) 2004 - 2008 Eike Stepper, Germany.
* 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
* Simon McDuff - http://bugs.eclipse.org/246705
**************************************************************************/
package org.eclipse.emf.internal.cdo.util;
import org.eclipse.emf.cdo.CDOObject;
import org.eclipse.emf.cdo.CDOSession;
import org.eclipse.emf.cdo.CDOState;
import org.eclipse.emf.cdo.CDOView;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.util.LegacySystemNotAvailableException;
import org.eclipse.emf.internal.cdo.CDOAdapterImpl;
import org.eclipse.emf.internal.cdo.CDOLegacyImpl;
import org.eclipse.emf.internal.cdo.CDOMetaImpl;
import org.eclipse.emf.internal.cdo.CDOViewImpl;
import org.eclipse.emf.internal.cdo.InternalCDOObject;
import org.eclipse.emf.internal.cdo.bundle.OM;
import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.ecore.EGenericType;
import org.eclipse.emf.ecore.EModelElement;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.InternalEObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.util.EcoreUtil;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Iterator;
/**
* @author Eike Stepper
*/
public final class FSMUtil
{
private static Method adaptLegacyMethod = initAdaptLegacyMethod();
private FSMUtil()
{
}
private static Method initAdaptLegacyMethod()
{
// TODO Fix when legacy mode is supported again...
// try
// {
// Class<?> c = Class.forName("org.eclipse.emf.internal.cdo.CDOCallbackImpl");
// if (c != null)
// {
// final Class<?>[] params = { Object.class, CDOView.class };
// Method method = c.getDeclaredMethod("adapt", params);
// if (method != null)
// {
// return method;
// }
// }
// }
// catch (Throwable ignore)
// {
// // Only for testing:
// // ignore.printStackTrace();
// }
//
// OM.LOG.info(LegacySystemNotAvailableException.LEGACY_SYSTEM_NOT_AVAILABLE);
return null;
}
public static boolean isLegacySystemAvailable()
{
return adaptLegacyMethod != null;
}
public static void checkLegacySystemAvailability(CDOSession session, CDOObject object)
throws LegacySystemNotAvailableException
{
if (!session.isLegacySupportEnabled() && object instanceof CDOLegacyImpl)
{
throw new LegacySystemNotAvailableException();
}
}
public static boolean isTransient(CDOObject object)
{
CDOState state = object.cdoState();
return state == CDOState.TRANSIENT || state == CDOState.PREPARED;
}
public static boolean isNew(CDOObject object)
{
CDOState state = object.cdoState();
return state == CDOState.NEW;
}
/**
* @param view
* Only needed if object is a meta instance.
*/
public static InternalCDOObject adapt(Object object, CDOView view)
{
if (object instanceof InternalCDOObject)
{
return (InternalCDOObject)object;
}
if (object == null)
{
throw new IllegalArgumentException("object == null");
}
if (object instanceof EModelElement || object instanceof EGenericType
|| object instanceof org.eclipse.emf.ecore.impl.EStringToStringMapEntryImpl)
{
InternalEObject eObject = (InternalEObject)object;
if (view == null)
{
throw new IllegalArgumentException("view == null");
}
if (eObject.eIsProxy())
{
eObject = (InternalEObject)EcoreUtil.resolve(eObject, view.getResourceSet());
}
CDOID id = ((CDOViewImpl)view).getSession().lookupMetaInstanceID(eObject);
if (id != null)
{
return new CDOMetaImpl((CDOViewImpl)view, eObject, id);
}
}
if (isLegacySystemAvailable())
{
try
{
return (InternalCDOObject)adaptLegacyMethod.invoke(null, object, view);
}
catch (Throwable t)
{
OM.LOG.info(t);
}
}
if (object instanceof InternalEObject)
{
EList<Adapter> adapters = ((InternalEObject)object).eAdapters();
CDOAdapterImpl adapter = (CDOAdapterImpl)EcoreUtil.getAdapter(adapters, CDOAdapterImpl.class);
if (adapter == null)
{
adapter = new CDOAdapterImpl();
adapters.add(adapter);
}
return adapter;
}
return null;
}
/**
* Similar to {@link EcoreUtil#getAllProperContents(Resource, boolean)} except gives only one depth
*/
public static Iterator<InternalCDOObject> getProperContents(final InternalCDOObject object)
{
final boolean isResource = object instanceof Resource;
final CDOView cdoView = object.cdoView();
final Iterator<EObject> delegate = object.eContents().iterator();
return new Iterator<InternalCDOObject>()
{
private Object next;
public boolean hasNext()
{
while (delegate.hasNext())
{
InternalEObject eObject = (InternalEObject)delegate.next();
if (isResource || eObject.eDirectResource() == null)
{
next = adapt(eObject, cdoView);
if (next instanceof InternalCDOObject)
{
return true;
}
}
}
return false;
}
public InternalCDOObject next()
{
return (InternalCDOObject)next;
}
public void remove()
{
throw new UnsupportedOperationException();
}
};
}
public static Iterator<InternalCDOObject> iterator(final Iterator<?> delegate, final CDOViewImpl view)
{
return new Iterator<InternalCDOObject>()
{
private Object next;
public boolean hasNext()
{
while (delegate.hasNext())
{
next = adapt(delegate.next(), view);
if (next instanceof InternalCDOObject)
{
return true;
}
}
return false;
}
public InternalCDOObject next()
{
return (InternalCDOObject)next;
}
public void remove()
{
throw new UnsupportedOperationException();
}
};
}
public static Iterator<InternalCDOObject> iterator(Collection<?> instances, final CDOViewImpl view)
{
return iterator(instances.iterator(), view);
}
}
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