plugins/org.eclipse.emf.cdo/src/org/eclipse/emf/internal/cdo/view/CDOStoreImpl.java - cdo/cdo - Git at Google

 /*
  * Copyright (c) 2011-2015 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
  *    Simon McDuff - bug 201266
  *    Eike Stepper & Simon McDuff - bug 204890
  *    Simon McDuff - bug 246705
  *    Simon McDuff - bug 246622
  *    Christian W. Damus (CEA) - bug 400236: get internal instance of objects in ID conversion
  */
 package org.eclipse.emf.internal.cdo.view;

 import org.eclipse.emf.cdo.common.id.CDOID;
 import org.eclipse.emf.cdo.common.model.CDOModelUtil;
 import org.eclipse.emf.cdo.common.model.CDOType;
 import org.eclipse.emf.cdo.common.revision.CDOElementProxy;
 import org.eclipse.emf.cdo.common.revision.CDOList;
 import org.eclipse.emf.cdo.common.revision.CDORevision;
 import org.eclipse.emf.cdo.common.revision.CDORevisionUtil;
 import org.eclipse.emf.cdo.common.revision.delta.CDOFeatureDelta;
 import org.eclipse.emf.cdo.eresource.CDOResource;
 import org.eclipse.emf.cdo.internal.common.revision.delta.CDOAddFeatureDeltaImpl;
 import org.eclipse.emf.cdo.internal.common.revision.delta.CDOClearFeatureDeltaImpl;
 import org.eclipse.emf.cdo.internal.common.revision.delta.CDOContainerFeatureDeltaImpl;
 import org.eclipse.emf.cdo.internal.common.revision.delta.CDOMoveFeatureDeltaImpl;
 import org.eclipse.emf.cdo.internal.common.revision.delta.CDORemoveFeatureDeltaImpl;
 import org.eclipse.emf.cdo.internal.common.revision.delta.CDOSetFeatureDeltaImpl;
 import org.eclipse.emf.cdo.internal.common.revision.delta.CDOUnsetFeatureDeltaImpl;
 import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevision;
 import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevisionManager;
 import org.eclipse.emf.cdo.util.CDOUtil;
 import org.eclipse.emf.cdo.util.ObjectNotFoundException;
 import org.eclipse.emf.cdo.view.CDOFeatureAnalyzer;
 import org.eclipse.emf.cdo.view.CDORevisionPrefetchingPolicy;
 import org.eclipse.emf.cdo.view.CDOStaleReferencePolicy;

 import org.eclipse.emf.internal.cdo.bundle.OM;

 import org.eclipse.net4j.util.ObjectUtil;
 import org.eclipse.net4j.util.om.trace.ContextTracer;

 import org.eclipse.emf.ecore.EClass;
 import org.eclipse.emf.ecore.EObject;
 import org.eclipse.emf.ecore.EReference;
 import org.eclipse.emf.ecore.EStructuralFeature;
 import org.eclipse.emf.ecore.InternalEObject;
 import org.eclipse.emf.ecore.InternalEObject.EStore;
 import org.eclipse.emf.ecore.util.FeatureMap;
 import org.eclipse.emf.ecore.util.FeatureMapUtil;
 import org.eclipse.emf.spi.cdo.CDOStore;
 import org.eclipse.emf.spi.cdo.FSMUtil;
 import org.eclipse.emf.spi.cdo.InternalCDOObject;
 import org.eclipse.emf.spi.cdo.InternalCDOView;

 import java.text.MessageFormat;
 import java.util.List;

 /**
  * CDORevision needs to follow these rules:<br>
  * - Keep CDOID only when the object (!isNew && !isTransient) // Only when CDOID will not changed.<br>
  * - Keep EObject for external reference, new, transient and that until commit time.<br>
  * It is important since these objects could changed and we need to keep a reference to {@link EObject} until the end.
  * It is the reason why {@link CDOStoreImpl} always call {@link InternalCDOView#convertObjectToID(Object, boolean)} with
  * true.
  *
  * @author Eike Stepper
  */
 public final class CDOStoreImpl implements CDOStore
 {
   private final ContextTracer TRACER = new ContextTracer(OM.DEBUG_STORE, CDOStoreImpl.class);

   private InternalCDOView view;

   public CDOStoreImpl(InternalCDOView view)
   {
     this.view = view;
   }

   public InternalCDOView getView()
   {
     return view;
   }

   /**
    * @category READ
    */
   public InternalEObject getContainer(InternalEObject eObject)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("getContainer({0})", cdoObject); //$NON-NLS-1$
       }

       InternalCDORevision revision = readRevision(cdoObject);
       return (InternalEObject)convertIDToObject(view, cdoObject, null, -1, revision.getContainerID());
     }
   }

   /**
    * @category READ
    */
   public int getContainingFeatureID(InternalEObject eObject)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("getContainingFeatureID({0})", cdoObject); //$NON-NLS-1$
       }

       InternalCDORevision revision = readRevision(cdoObject);
       return revision.getContainingFeatureID();
     }
   }

   /**
    * @category READ
    */
   public InternalEObject getResource(InternalEObject eObject)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("getResource({0})", cdoObject); //$NON-NLS-1$
       }

       InternalCDORevision revision = readRevision(cdoObject);
       return (InternalEObject)convertIDToObject(view, cdoObject, null, -1, revision.getResourceID());
     }
   }

   /**
    * @category READ
    */
   public EStructuralFeature getContainingFeature(InternalEObject eObject)
   {
     throw new UnsupportedOperationException("Use getContainingFeatureID() instead"); //$NON-NLS-1$
   }

   /**
    * @category READ
    */
   public Object get(InternalEObject eObject, EStructuralFeature feature, int index)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("get({0}, {1}, {2})", cdoObject, feature, index); //$NON-NLS-1$
       }

       CDOFeatureAnalyzer featureAnalyzer = view.options().getFeatureAnalyzer();

       featureAnalyzer.preTraverseFeature(cdoObject, feature, index);
       InternalCDORevision revision = readRevision(cdoObject);

       Object value = revision.get(feature, index);
       value = convertToEMF(eObject, revision, feature, index, value);

       featureAnalyzer.postTraverseFeature(cdoObject, feature, index, value);
       return value;
     }
   }

   /**
    * @category READ
    */
   public boolean isSet(InternalEObject eObject, EStructuralFeature feature)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("isSet({0}, {1})", cdoObject, feature); //$NON-NLS-1$
       }

       InternalCDORevision revision = readRevision(cdoObject);
       if (feature.isMany())
       {
         CDOList list = revision.getList(feature);
         return list != null && !list.isEmpty();
       }

       Object value = revision.getValue(feature);
       if (feature.isUnsettable())
       {
         return value != null;
       }

       if (value == null)
       {
         return false;
       }

       value = convertToEMF(eObject, revision, feature, NO_INDEX, value);
       Object defaultValue = feature.getDefaultValue();
       return !ObjectUtil.equals(value, defaultValue);
     }
   }

   /**
    * @category READ
    */
   public int size(InternalEObject eObject, EStructuralFeature feature)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("size({0}, {1})", cdoObject, feature); //$NON-NLS-1$
       }

       InternalCDORevision revision = readRevision(cdoObject);
       return revision.size(feature);
     }
   }

   /**
    * @category READ
    */
   public boolean isEmpty(InternalEObject eObject, EStructuralFeature feature)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("isEmpty({0}, {1})", cdoObject, feature); //$NON-NLS-1$
       }

       InternalCDORevision revision = readRevision(cdoObject);
       return revision.isEmpty(feature);
     }
   }

   /**
    * @category READ
    */
   public boolean contains(InternalEObject eObject, EStructuralFeature feature, Object value)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("contains({0}, {1}, {2})", cdoObject, feature, value); //$NON-NLS-1$
       }

       Object convertedValue = convertToCDO(cdoObject, feature, value);

       InternalCDORevision revision = readRevision(cdoObject);
       boolean result = revision.contains(feature, convertedValue);

       // Special handling of detached (TRANSIENT) objects, see bug 354395
       if (!result && value != convertedValue && value instanceof EObject)
       {
         result = revision.contains(feature, value);
       }

       return result;
     }
   }

   /**
    * @category READ
    */
   public int indexOf(InternalEObject eObject, EStructuralFeature feature, Object value)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("indexOf({0}, {1}, {2})", cdoObject, feature, value); //$NON-NLS-1$
       }

       value = convertToCDO(cdoObject, feature, value);

       InternalCDORevision revision = readRevision(cdoObject);
       return revision.indexOf(feature, value);
     }
   }

   /**
    * @category READ
    */
   public int lastIndexOf(InternalEObject eObject, EStructuralFeature feature, Object value)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("lastIndexOf({0}, {1}, {2})", cdoObject, feature, value); //$NON-NLS-1$
       }

       value = convertToCDO(cdoObject, feature, value);

       InternalCDORevision revision = readRevision(cdoObject);
       return revision.lastIndexOf(feature, value);
     }
   }

   /**
    * @category READ
    */
   public int hashCode(InternalEObject eObject, EStructuralFeature feature)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("hashCode({0}, {1})", cdoObject, feature); //$NON-NLS-1$
       }

       InternalCDORevision revision = readRevision(cdoObject);
       return revision.hashCode(feature);
     }
   }

   /**
    * @category READ
    */
   public Object[] toArray(InternalEObject eObject, EStructuralFeature feature)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("toArray({0}, {1})", cdoObject, feature); //$NON-NLS-1$
       }

       InternalCDORevision revision = readRevision(cdoObject);
       Object[] result = revision.toArray(feature);
       for (int i = 0; i < result.length; i++)
       {
         result[i] = convertToEMF(eObject, revision, feature, i, result[i]);
       }

       // // TODO Clarify feature maps
       // if (feature instanceof EReference)
       // {
       // for (int i = 0; i < result.length; i++)
       // {
       // result[i] = resolveProxy(revision, feature, i, result[i]);
       // result[i] = convertIdToObject(cdoObject.cdoView(), eObject, feature, i, result[i]);
       // }
       // }

       return result;
     }
   }

   /**
    * @category READ
    */
   @SuppressWarnings("unchecked")
   public <T> T[] toArray(InternalEObject eObject, EStructuralFeature feature, T[] a)
   {
     synchronized (view)
     {
       Object[] array = toArray(eObject, feature);
       int size = array.length;

       if (a.length < size)
       {
         a = (T[])java.lang.reflect.Array.newInstance(a.getClass().getComponentType(), size);
       }

       System.arraycopy(array, 0, a, 0, size);
       if (a.length > size)
       {
         a[size] = null;
       }

       return a;
     }
   }

   /**
    * @category WRITE
    */
   public void setContainer(InternalEObject eObject, CDOResource newResource, InternalEObject newEContainer,
       int newContainerFeatureID)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("setContainer({0}, {1}, {2}, {3})", cdoObject, newResource, newEContainer, newContainerFeatureID); //$NON-NLS-1$
       }

       Object newContainerID = newEContainer == null ? CDOID.NULL : view.convertObjectToID(newEContainer, true);
       CDOID newResourceID = newResource == null ? CDOID.NULL : newResource.cdoID();

       CDOFeatureDelta delta = new CDOContainerFeatureDeltaImpl(newResourceID, newContainerID, newContainerFeatureID);
       writeRevision(cdoObject, delta);
     }
   }

   /**
    * @category WRITE RESULT
    */
   public Object set(InternalEObject eObject, EStructuralFeature feature, int index, Object value)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("set({0}, {1}, {2}, {3})", cdoObject, feature, index, value); //$NON-NLS-1$
       }

       value = convertToCDO(cdoObject, feature, value);

       // TODO: Use writeRevision() result!!
       InternalCDORevision oldRevision = readRevision(cdoObject);
       Object oldValue = oldRevision.get(feature, index);
       oldValue = convertToEMF(eObject, oldRevision, feature, index, oldValue);

       CDOFeatureDelta delta = new CDOSetFeatureDeltaImpl(feature, index, value, oldValue);
       writeRevision(cdoObject, delta);

       return oldValue;
     }
   }

   /**
    * @category WRITE
    */
   public void unset(InternalEObject eObject, EStructuralFeature feature)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("unset({0}, {1})", cdoObject, feature); //$NON-NLS-1$
       }

       if (feature.isMany())
       {
         Object object = cdoObject.eGet(feature);
         if (object instanceof List<?> && !CDOUtil.isLegacyObject(cdoObject))
         {
           List<?> list = (List<?>)object;
           list.clear();
         }
       }
       else
       {
         CDOFeatureDelta delta = new CDOUnsetFeatureDeltaImpl(feature);
         writeRevision(cdoObject, delta);
       }
     }
   }

   /**
    * @category WRITE
    */
   public void add(InternalEObject eObject, EStructuralFeature feature, int index, Object value)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("add({0}, {1}, {2}, {3})", cdoObject, feature, index, value); //$NON-NLS-1$
       }

       value = convertToCDO(cdoObject, feature, value);

       CDOFeatureDelta delta = new CDOAddFeatureDeltaImpl(feature, index, value);
       writeRevision(cdoObject, delta);
     }
   }

   /**
    * @category WRITE RESULT
    */
   public Object remove(InternalEObject eObject, EStructuralFeature feature, int index)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("remove({0}, {1}, {2})", cdoObject, feature, index); //$NON-NLS-1$
       }

       Object oldValue = getOldListValue(eObject, cdoObject, feature, index);

       removeElement(cdoObject, feature, index);
       return oldValue;
     }
   }

   /**
    * @category WRITE RESULT
    */
   public Object move(InternalEObject eObject, EStructuralFeature feature, int target, int source)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("move({0}, {1}, {2}, {3})", cdoObject, feature, target, source); //$NON-NLS-1$
       }

       Object oldValue = getOldListValue(eObject, cdoObject, feature, source);

       CDOFeatureDelta delta = new CDOMoveFeatureDeltaImpl(feature, target, source);
       writeRevision(cdoObject, delta);

       return oldValue;
     }
   }

   /**
    * @category WRITE
    */
   public void clear(InternalEObject eObject, EStructuralFeature feature)
   {
     synchronized (view)
     {
       InternalCDOObject cdoObject = getCDOObject(eObject);
       if (TRACER.isEnabled())
       {
         TRACER.format("clear({0}, {1})", cdoObject, feature); //$NON-NLS-1$
       }

       CDOFeatureDelta delta = new CDOClearFeatureDeltaImpl(feature);
       writeRevision(cdoObject, delta);
     }
   }

   public EObject create(EClass eClass)
   {
     throw new UnsupportedOperationException("Use the generated factory to create objects"); //$NON-NLS-1$
   }

   @Override
   public String toString()
   {
     return MessageFormat.format("CDOStore[{0}]", view); //$NON-NLS-1$
   }

   /**
    * @since 2.0
    */
   public Object resolveProxy(InternalCDORevision revision, EStructuralFeature feature, int index, Object value)
   {
     synchronized (view)
     {
       if (value instanceof CDOElementProxy)
       {
         // Resolve proxy
         CDOElementProxy proxy = (CDOElementProxy)value;
         value = view.getSession().resolveElementProxy(revision, feature, index, proxy.getIndex());
       }

       return value;
     }
   }

   /**
    * @since 3.0
    */
   public Object convertToCDO(InternalCDOObject object, EStructuralFeature feature, Object value)
   {
     synchronized (view)
     {
       if (value != null)
       {
         if (feature instanceof EReference)
         {
           value = view.convertObjectToID(value, true);
         }
         else if (FeatureMapUtil.isFeatureMap(feature))
         {
           FeatureMap.Entry entry = (FeatureMap.Entry)value;
           EStructuralFeature innerFeature = entry.getEStructuralFeature();
           Object innerValue = entry.getValue();
           Object convertedValue = view.convertObjectToID(innerValue);
           if (convertedValue != innerValue)
           {
             value = CDORevisionUtil.createFeatureMapEntry(innerFeature, convertedValue);
           }
         }
         else
         {
           CDOType type = CDOModelUtil.getType(feature.getEType());
           if (type != null)
           {
             value = type.convertToCDO(feature.getEType(), value);
           }
         }
       }

       return value;
     }
   }

   /**
    * @since 2.0
    */
   public Object convertToEMF(EObject eObject, InternalCDORevision revision, EStructuralFeature feature, int index,
       Object value)
   {
     synchronized (view)
     {
       if (value != null)
       {
         if (feature.isMany())
         {
           if (index == EStore.NO_INDEX)
           {
             return value;
           }

           value = resolveProxy(revision, feature, index, value);
           if (value instanceof CDOID)
           {
             CDOID id = (CDOID)value;
             CDOList list = revision.getList(feature);
             CDORevisionPrefetchingPolicy policy = view.options().getRevisionPrefetchingPolicy();
             InternalCDORevisionManager revisionManager = view.getSession().getRevisionManager();
             List<CDOID> listOfIDs = policy.loadAhead(revisionManager, view, eObject, feature, list, index, id);
             if (!listOfIDs.isEmpty())
             {
               int initialChunkSize = view.getSession().options().getCollectionLoadingPolicy().getInitialChunkSize();
               revisionManager.getRevisions(listOfIDs, view, initialChunkSize, CDORevision.DEPTH_NONE, true);
             }
           }
         }

         if (feature instanceof EReference)
         {
           value = convertIDToObject(view, eObject, feature, index, value);
         }
         else if (FeatureMapUtil.isFeatureMap(feature))
         {
           FeatureMap.Entry entry = (FeatureMap.Entry)value;
           EStructuralFeature innerFeature = entry.getEStructuralFeature();
           Object innerValue = entry.getValue();
           Object convertedValue = convertIDToObject(view, eObject, feature, index, innerValue);
           if (convertedValue != innerValue)
           {
             value = FeatureMapUtil.createEntry(innerFeature, convertedValue);
           }
         }
         else
         {
           CDOType type = CDOModelUtil.getType(feature.getEType());
           if (type != null)
           {
             value = type.convertToEMF(feature.getEType(), value);
           }
         }
       }

       return value;
     }
   }

   private Object convertIDToObject(InternalCDOView view, EObject eObject, EStructuralFeature feature, int index,
       Object value)
   {
     try
     {
       value = view.convertIDToObject(value);
     }
     catch (ObjectNotFoundException ex)
     {
       if (value instanceof CDOID)
       {
         // If feature == null then we come from getContainer()/getResource() and are in case of detached object
         // consequently to a remote parent object remove then must return null
         if (feature != null)
         {
           CDOStaleReferencePolicy staleReferencePolicy = view.options().getStaleReferencePolicy();
           value = staleReferencePolicy.processStaleReference(eObject, feature, index, ex.getID());
         }
         else
         {
           value = null;
         }
       }
     }

     return getInternalInstance(value);
   }

   private InternalCDOObject getCDOObject(Object object)
   {
     return FSMUtil.adapt(object, view);
   }

   private Object getInternalInstance(Object object)
   {
     if (object instanceof InternalCDOObject)
     {
       return ((InternalCDOObject)object).cdoInternalInstance();
     }

     return object;
   }

   private Object getOldListValue(InternalEObject eObject, InternalCDOObject cdoObject, EStructuralFeature feature,
       int index)
   {
     if (!feature.isMany())
     {
       throw new UnsupportedOperationException("Not supported for single-valued features");
     }

     // Bug 293283 / Bug 314387
     InternalCDORevision revision = readRevision(cdoObject);
     CDOList list = revision.getList(feature);
     int size = list.size();
     if (index < 0 || size <= index)
     {
       throw new IndexOutOfBoundsException("Index: " + index + ", Size: " + size);
     }

     Object oldValue = revision.get(feature, index);
     oldValue = convertToEMF(eObject, revision, feature, index, oldValue);
     return oldValue;
   }

   private static InternalCDORevision readRevision(InternalCDOObject cdoObject)
   {
     InternalCDORevision revision = CDOStateMachine.INSTANCE.read(cdoObject);
     if (revision == null)
     {
       throw new IllegalStateException("revision == null");
     }

     return revision;
   }

   private static Object writeRevision(InternalCDOObject cdoObject, CDOFeatureDelta delta)
   {
     return CDOStateMachine.INSTANCE.write(cdoObject, delta);
   }

   public static void removeElement(InternalCDOObject cdoObject, EStructuralFeature feature, int index)
   {
     CDOFeatureDelta delta = new CDORemoveFeatureDeltaImpl(feature, index);
     writeRevision(cdoObject, delta);
   }
 }
	/*
	* Copyright (c) 2011-2015 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
	* Simon McDuff - bug 201266
	* Eike Stepper & Simon McDuff - bug 204890
	* Simon McDuff - bug 246705
	* Simon McDuff - bug 246622
	* Christian W. Damus (CEA) - bug 400236: get internal instance of objects in ID conversion
	*/
	package org.eclipse.emf.internal.cdo.view;

	import org.eclipse.emf.cdo.common.id.CDOID;
	import org.eclipse.emf.cdo.common.model.CDOModelUtil;
	import org.eclipse.emf.cdo.common.model.CDOType;
	import org.eclipse.emf.cdo.common.revision.CDOElementProxy;
	import org.eclipse.emf.cdo.common.revision.CDOList;
	import org.eclipse.emf.cdo.common.revision.CDORevision;
	import org.eclipse.emf.cdo.common.revision.CDORevisionUtil;
	import org.eclipse.emf.cdo.common.revision.delta.CDOFeatureDelta;
	import org.eclipse.emf.cdo.eresource.CDOResource;
	import org.eclipse.emf.cdo.internal.common.revision.delta.CDOAddFeatureDeltaImpl;
	import org.eclipse.emf.cdo.internal.common.revision.delta.CDOClearFeatureDeltaImpl;
	import org.eclipse.emf.cdo.internal.common.revision.delta.CDOContainerFeatureDeltaImpl;
	import org.eclipse.emf.cdo.internal.common.revision.delta.CDOMoveFeatureDeltaImpl;
	import org.eclipse.emf.cdo.internal.common.revision.delta.CDORemoveFeatureDeltaImpl;
	import org.eclipse.emf.cdo.internal.common.revision.delta.CDOSetFeatureDeltaImpl;
	import org.eclipse.emf.cdo.internal.common.revision.delta.CDOUnsetFeatureDeltaImpl;
	import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevision;
	import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevisionManager;
	import org.eclipse.emf.cdo.util.CDOUtil;
	import org.eclipse.emf.cdo.util.ObjectNotFoundException;
	import org.eclipse.emf.cdo.view.CDOFeatureAnalyzer;
	import org.eclipse.emf.cdo.view.CDORevisionPrefetchingPolicy;
	import org.eclipse.emf.cdo.view.CDOStaleReferencePolicy;

	import org.eclipse.emf.internal.cdo.bundle.OM;

	import org.eclipse.net4j.util.ObjectUtil;
	import org.eclipse.net4j.util.om.trace.ContextTracer;

	import org.eclipse.emf.ecore.EClass;
	import org.eclipse.emf.ecore.EObject;
	import org.eclipse.emf.ecore.EReference;
	import org.eclipse.emf.ecore.EStructuralFeature;
	import org.eclipse.emf.ecore.InternalEObject;
	import org.eclipse.emf.ecore.InternalEObject.EStore;
	import org.eclipse.emf.ecore.util.FeatureMap;
	import org.eclipse.emf.ecore.util.FeatureMapUtil;
	import org.eclipse.emf.spi.cdo.CDOStore;
	import org.eclipse.emf.spi.cdo.FSMUtil;
	import org.eclipse.emf.spi.cdo.InternalCDOObject;
	import org.eclipse.emf.spi.cdo.InternalCDOView;

	import java.text.MessageFormat;
	import java.util.List;

	/**
	* CDORevision needs to follow these rules:<br>
	* - Keep CDOID only when the object (!isNew && !isTransient) // Only when CDOID will not changed.<br>
	* - Keep EObject for external reference, new, transient and that until commit time.<br>
	* It is important since these objects could changed and we need to keep a reference to {@link EObject} until the end.
	* It is the reason why {@link CDOStoreImpl} always call {@link InternalCDOView#convertObjectToID(Object, boolean)} with
	* true.
	*
	* @author Eike Stepper
	*/
	public final class CDOStoreImpl implements CDOStore
	{
	private final ContextTracer TRACER = new ContextTracer(OM.DEBUG_STORE, CDOStoreImpl.class);

	private InternalCDOView view;

	public CDOStoreImpl(InternalCDOView view)
	{
	this.view = view;
	}

	public InternalCDOView getView()
	{
	return view;
	}

	/**
	* @category READ
	*/
	public InternalEObject getContainer(InternalEObject eObject)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("getContainer({0})", cdoObject); //$NON-NLS-1$
	}

	InternalCDORevision revision = readRevision(cdoObject);
	return (InternalEObject)convertIDToObject(view, cdoObject, null, -1, revision.getContainerID());
	}
	}

	/**
	* @category READ
	*/
	public int getContainingFeatureID(InternalEObject eObject)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("getContainingFeatureID({0})", cdoObject); //$NON-NLS-1$
	}

	InternalCDORevision revision = readRevision(cdoObject);
	return revision.getContainingFeatureID();
	}
	}

	/**
	* @category READ
	*/
	public InternalEObject getResource(InternalEObject eObject)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("getResource({0})", cdoObject); //$NON-NLS-1$
	}

	InternalCDORevision revision = readRevision(cdoObject);
	return (InternalEObject)convertIDToObject(view, cdoObject, null, -1, revision.getResourceID());
	}
	}

	/**
	* @category READ
	*/
	public EStructuralFeature getContainingFeature(InternalEObject eObject)
	{
	throw new UnsupportedOperationException("Use getContainingFeatureID() instead"); //$NON-NLS-1$
	}

	/**
	* @category READ
	*/
	public Object get(InternalEObject eObject, EStructuralFeature feature, int index)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("get({0}, {1}, {2})", cdoObject, feature, index); //$NON-NLS-1$
	}

	CDOFeatureAnalyzer featureAnalyzer = view.options().getFeatureAnalyzer();

	featureAnalyzer.preTraverseFeature(cdoObject, feature, index);
	InternalCDORevision revision = readRevision(cdoObject);

	Object value = revision.get(feature, index);
	value = convertToEMF(eObject, revision, feature, index, value);

	featureAnalyzer.postTraverseFeature(cdoObject, feature, index, value);
	return value;
	}
	}

	/**
	* @category READ
	*/
	public boolean isSet(InternalEObject eObject, EStructuralFeature feature)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("isSet({0}, {1})", cdoObject, feature); //$NON-NLS-1$
	}

	InternalCDORevision revision = readRevision(cdoObject);
	if (feature.isMany())
	{
	CDOList list = revision.getList(feature);
	return list != null && !list.isEmpty();
	}

	Object value = revision.getValue(feature);
	if (feature.isUnsettable())
	{
	return value != null;
	}

	if (value == null)
	{
	return false;
	}

	value = convertToEMF(eObject, revision, feature, NO_INDEX, value);
	Object defaultValue = feature.getDefaultValue();
	return !ObjectUtil.equals(value, defaultValue);
	}
	}

	/**
	* @category READ
	*/
	public int size(InternalEObject eObject, EStructuralFeature feature)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("size({0}, {1})", cdoObject, feature); //$NON-NLS-1$
	}

	InternalCDORevision revision = readRevision(cdoObject);
	return revision.size(feature);
	}
	}

	/**
	* @category READ
	*/
	public boolean isEmpty(InternalEObject eObject, EStructuralFeature feature)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("isEmpty({0}, {1})", cdoObject, feature); //$NON-NLS-1$
	}

	InternalCDORevision revision = readRevision(cdoObject);
	return revision.isEmpty(feature);
	}
	}

	/**
	* @category READ
	*/
	public boolean contains(InternalEObject eObject, EStructuralFeature feature, Object value)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("contains({0}, {1}, {2})", cdoObject, feature, value); //$NON-NLS-1$
	}

	Object convertedValue = convertToCDO(cdoObject, feature, value);

	InternalCDORevision revision = readRevision(cdoObject);
	boolean result = revision.contains(feature, convertedValue);

	// Special handling of detached (TRANSIENT) objects, see bug 354395
	if (!result && value != convertedValue && value instanceof EObject)
	{
	result = revision.contains(feature, value);
	}

	return result;
	}
	}

	/**
	* @category READ
	*/
	public int indexOf(InternalEObject eObject, EStructuralFeature feature, Object value)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("indexOf({0}, {1}, {2})", cdoObject, feature, value); //$NON-NLS-1$
	}

	value = convertToCDO(cdoObject, feature, value);

	InternalCDORevision revision = readRevision(cdoObject);
	return revision.indexOf(feature, value);
	}
	}

	/**
	* @category READ
	*/
	public int lastIndexOf(InternalEObject eObject, EStructuralFeature feature, Object value)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("lastIndexOf({0}, {1}, {2})", cdoObject, feature, value); //$NON-NLS-1$
	}

	value = convertToCDO(cdoObject, feature, value);

	InternalCDORevision revision = readRevision(cdoObject);
	return revision.lastIndexOf(feature, value);
	}
	}

	/**
	* @category READ
	*/
	public int hashCode(InternalEObject eObject, EStructuralFeature feature)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("hashCode({0}, {1})", cdoObject, feature); //$NON-NLS-1$
	}

	InternalCDORevision revision = readRevision(cdoObject);
	return revision.hashCode(feature);
	}
	}

	/**
	* @category READ
	*/
	public Object[] toArray(InternalEObject eObject, EStructuralFeature feature)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("toArray({0}, {1})", cdoObject, feature); //$NON-NLS-1$
	}

	InternalCDORevision revision = readRevision(cdoObject);
	Object[] result = revision.toArray(feature);
	for (int i = 0; i < result.length; i++)
	{
	result[i] = convertToEMF(eObject, revision, feature, i, result[i]);
	}

	// // TODO Clarify feature maps
	// if (feature instanceof EReference)
	// {
	// for (int i = 0; i < result.length; i++)
	// {
	// result[i] = resolveProxy(revision, feature, i, result[i]);
	// result[i] = convertIdToObject(cdoObject.cdoView(), eObject, feature, i, result[i]);
	// }
	// }

	return result;
	}
	}

	/**
	* @category READ
	*/
	@SuppressWarnings("unchecked")
	public <T> T[] toArray(InternalEObject eObject, EStructuralFeature feature, T[] a)
	{
	synchronized (view)
	{
	Object[] array = toArray(eObject, feature);
	int size = array.length;

	if (a.length < size)
	{
	a = (T[])java.lang.reflect.Array.newInstance(a.getClass().getComponentType(), size);
	}

	System.arraycopy(array, 0, a, 0, size);
	if (a.length > size)
	{
	a[size] = null;
	}

	return a;
	}
	}

	/**
	* @category WRITE
	*/
	public void setContainer(InternalEObject eObject, CDOResource newResource, InternalEObject newEContainer,
	int newContainerFeatureID)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("setContainer({0}, {1}, {2}, {3})", cdoObject, newResource, newEContainer, newContainerFeatureID); //$NON-NLS-1$
	}

	Object newContainerID = newEContainer == null ? CDOID.NULL : view.convertObjectToID(newEContainer, true);
	CDOID newResourceID = newResource == null ? CDOID.NULL : newResource.cdoID();

	CDOFeatureDelta delta = new CDOContainerFeatureDeltaImpl(newResourceID, newContainerID, newContainerFeatureID);
	writeRevision(cdoObject, delta);
	}
	}

	/**
	* @category WRITE RESULT
	*/
	public Object set(InternalEObject eObject, EStructuralFeature feature, int index, Object value)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("set({0}, {1}, {2}, {3})", cdoObject, feature, index, value); //$NON-NLS-1$
	}

	value = convertToCDO(cdoObject, feature, value);

	// TODO: Use writeRevision() result!!
	InternalCDORevision oldRevision = readRevision(cdoObject);
	Object oldValue = oldRevision.get(feature, index);
	oldValue = convertToEMF(eObject, oldRevision, feature, index, oldValue);

	CDOFeatureDelta delta = new CDOSetFeatureDeltaImpl(feature, index, value, oldValue);
	writeRevision(cdoObject, delta);

	return oldValue;
	}
	}

	/**
	* @category WRITE
	*/
	public void unset(InternalEObject eObject, EStructuralFeature feature)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("unset({0}, {1})", cdoObject, feature); //$NON-NLS-1$
	}

	if (feature.isMany())
	{
	Object object = cdoObject.eGet(feature);
	if (object instanceof List<?> && !CDOUtil.isLegacyObject(cdoObject))
	{
	List<?> list = (List<?>)object;
	list.clear();
	}
	}
	else
	{
	CDOFeatureDelta delta = new CDOUnsetFeatureDeltaImpl(feature);
	writeRevision(cdoObject, delta);
	}
	}
	}

	/**
	* @category WRITE
	*/
	public void add(InternalEObject eObject, EStructuralFeature feature, int index, Object value)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("add({0}, {1}, {2}, {3})", cdoObject, feature, index, value); //$NON-NLS-1$
	}

	value = convertToCDO(cdoObject, feature, value);

	CDOFeatureDelta delta = new CDOAddFeatureDeltaImpl(feature, index, value);
	writeRevision(cdoObject, delta);
	}
	}

	/**
	* @category WRITE RESULT
	*/
	public Object remove(InternalEObject eObject, EStructuralFeature feature, int index)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("remove({0}, {1}, {2})", cdoObject, feature, index); //$NON-NLS-1$
	}

	Object oldValue = getOldListValue(eObject, cdoObject, feature, index);

	removeElement(cdoObject, feature, index);
	return oldValue;
	}
	}

	/**
	* @category WRITE RESULT
	*/
	public Object move(InternalEObject eObject, EStructuralFeature feature, int target, int source)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("move({0}, {1}, {2}, {3})", cdoObject, feature, target, source); //$NON-NLS-1$
	}

	Object oldValue = getOldListValue(eObject, cdoObject, feature, source);

	CDOFeatureDelta delta = new CDOMoveFeatureDeltaImpl(feature, target, source);
	writeRevision(cdoObject, delta);

	return oldValue;
	}
	}

	/**
	* @category WRITE
	*/
	public void clear(InternalEObject eObject, EStructuralFeature feature)
	{
	synchronized (view)
	{
	InternalCDOObject cdoObject = getCDOObject(eObject);
	if (TRACER.isEnabled())
	{
	TRACER.format("clear({0}, {1})", cdoObject, feature); //$NON-NLS-1$
	}

	CDOFeatureDelta delta = new CDOClearFeatureDeltaImpl(feature);
	writeRevision(cdoObject, delta);
	}
	}

	public EObject create(EClass eClass)
	{
	throw new UnsupportedOperationException("Use the generated factory to create objects"); //$NON-NLS-1$
	}

	@Override
	public String toString()
	{
	return MessageFormat.format("CDOStore[{0}]", view); //$NON-NLS-1$
	}

	/**
	* @since 2.0
	*/
	public Object resolveProxy(InternalCDORevision revision, EStructuralFeature feature, int index, Object value)
	{
	synchronized (view)
	{
	if (value instanceof CDOElementProxy)
	{
	// Resolve proxy
	CDOElementProxy proxy = (CDOElementProxy)value;
	value = view.getSession().resolveElementProxy(revision, feature, index, proxy.getIndex());
	}

	return value;
	}
	}

	/**
	* @since 3.0
	*/
	public Object convertToCDO(InternalCDOObject object, EStructuralFeature feature, Object value)
	{
	synchronized (view)
	{
	if (value != null)
	{
	if (feature instanceof EReference)
	{
	value = view.convertObjectToID(value, true);
	}
	else if (FeatureMapUtil.isFeatureMap(feature))
	{
	FeatureMap.Entry entry = (FeatureMap.Entry)value;
	EStructuralFeature innerFeature = entry.getEStructuralFeature();
	Object innerValue = entry.getValue();
	Object convertedValue = view.convertObjectToID(innerValue);
	if (convertedValue != innerValue)
	{
	value = CDORevisionUtil.createFeatureMapEntry(innerFeature, convertedValue);
	}
	}
	else
	{
	CDOType type = CDOModelUtil.getType(feature.getEType());
	if (type != null)
	{
	value = type.convertToCDO(feature.getEType(), value);
	}
	}
	}

	return value;
	}
	}

	/**
	* @since 2.0
	*/
	public Object convertToEMF(EObject eObject, InternalCDORevision revision, EStructuralFeature feature, int index,
	Object value)
	{
	synchronized (view)
	{
	if (value != null)
	{
	if (feature.isMany())
	{
	if (index == EStore.NO_INDEX)
	{
	return value;
	}

	value = resolveProxy(revision, feature, index, value);
	if (value instanceof CDOID)
	{
	CDOID id = (CDOID)value;
	CDOList list = revision.getList(feature);
	CDORevisionPrefetchingPolicy policy = view.options().getRevisionPrefetchingPolicy();
	InternalCDORevisionManager revisionManager = view.getSession().getRevisionManager();
	List<CDOID> listOfIDs = policy.loadAhead(revisionManager, view, eObject, feature, list, index, id);
	if (!listOfIDs.isEmpty())
	{
	int initialChunkSize = view.getSession().options().getCollectionLoadingPolicy().getInitialChunkSize();
	revisionManager.getRevisions(listOfIDs, view, initialChunkSize, CDORevision.DEPTH_NONE, true);
	}
	}
	}

	if (feature instanceof EReference)
	{
	value = convertIDToObject(view, eObject, feature, index, value);
	}
	else if (FeatureMapUtil.isFeatureMap(feature))
	{
	FeatureMap.Entry entry = (FeatureMap.Entry)value;
	EStructuralFeature innerFeature = entry.getEStructuralFeature();
	Object innerValue = entry.getValue();
	Object convertedValue = convertIDToObject(view, eObject, feature, index, innerValue);
	if (convertedValue != innerValue)
	{
	value = FeatureMapUtil.createEntry(innerFeature, convertedValue);
	}
	}
	else
	{
	CDOType type = CDOModelUtil.getType(feature.getEType());
	if (type != null)
	{
	value = type.convertToEMF(feature.getEType(), value);
	}
	}
	}

	return value;
	}
	}

	private Object convertIDToObject(InternalCDOView view, EObject eObject, EStructuralFeature feature, int index,
	Object value)
	{
	try
	{
	value = view.convertIDToObject(value);
	}
	catch (ObjectNotFoundException ex)
	{
	if (value instanceof CDOID)
	{
	// If feature == null then we come from getContainer()/getResource() and are in case of detached object
	// consequently to a remote parent object remove then must return null
	if (feature != null)
	{
	CDOStaleReferencePolicy staleReferencePolicy = view.options().getStaleReferencePolicy();
	value = staleReferencePolicy.processStaleReference(eObject, feature, index, ex.getID());
	}
	else
	{
	value = null;
	}
	}
	}

	return getInternalInstance(value);
	}

	private InternalCDOObject getCDOObject(Object object)
	{
	return FSMUtil.adapt(object, view);
	}

	private Object getInternalInstance(Object object)
	{
	if (object instanceof InternalCDOObject)
	{
	return ((InternalCDOObject)object).cdoInternalInstance();
	}

	return object;
	}

	private Object getOldListValue(InternalEObject eObject, InternalCDOObject cdoObject, EStructuralFeature feature,
	int index)
	{
	if (!feature.isMany())
	{
	throw new UnsupportedOperationException("Not supported for single-valued features");
	}

	// Bug 293283 / Bug 314387
	InternalCDORevision revision = readRevision(cdoObject);
	CDOList list = revision.getList(feature);
	int size = list.size();
	if (index < 0 \|\| size <= index)
	{
	throw new IndexOutOfBoundsException("Index: " + index + ", Size: " + size);
	}

	Object oldValue = revision.get(feature, index);
	oldValue = convertToEMF(eObject, revision, feature, index, oldValue);
	return oldValue;
	}

	private static InternalCDORevision readRevision(InternalCDOObject cdoObject)
	{
	InternalCDORevision revision = CDOStateMachine.INSTANCE.read(cdoObject);
	if (revision == null)
	{
	throw new IllegalStateException("revision == null");
	}

	return revision;
	}

	private static Object writeRevision(InternalCDOObject cdoObject, CDOFeatureDelta delta)
	{
	return CDOStateMachine.INSTANCE.write(cdoObject, delta);
	}

	public static void removeElement(InternalCDOObject cdoObject, EStructuralFeature feature, int index)
	{
	CDOFeatureDelta delta = new CDORemoveFeatureDeltaImpl(feature, index);
	writeRevision(cdoObject, delta);
	}
	}