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/*
 * Copyright (c) 2008-2013 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
 *    Simon McDuff - bug 212958
 *    Simon McDuff - bug 213402
 *    Caspar De Groot - bug 341081
 */
package org.eclipse.emf.cdo.internal.common.revision;

import org.eclipse.emf.cdo.common.model.CDOModelUtil;
import org.eclipse.emf.cdo.common.model.CDOType;
import org.eclipse.emf.cdo.spi.common.revision.BaseCDORevision;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDOList;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevision;

import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EStructuralFeature;

/**
 * @author Eike Stepper
 */
public class CDORevisionImpl extends BaseCDORevision
{
  private Object[] values;

  /**
   * Indicates if the revision is being copied from another revision. In that case isWritable() will allways return true.
   */
  private boolean isCopying;

  public CDORevisionImpl(EClass eClass)
  {
    super(eClass);
  }

  protected CDORevisionImpl(CDORevisionImpl source)
  {
    super(source);
    EStructuralFeature[] features = clearValues();

    int length = features.length;
    isCopying = true;
    try
    {
      for (int i = 0; i < length; i++)
      {
        EStructuralFeature feature = features[i];
        if (feature.isMany())
        {
          InternalCDOList sourceList = (InternalCDOList)source.values[i];
          if (sourceList != null)
          {
            EClassifier classifier = feature.getEType();
            setValue(i, sourceList.clone(classifier));
          }
        }
        else
        {
          CDOType type = CDOModelUtil.getType(feature);
          setValue(i, type.copyValue(source.values[i]));
        }
      }
    }
    finally
    {
      isCopying = false;
    }
  }

  public InternalCDORevision copy()
  {
    return new CDORevisionImpl(this);
  }

  @Override
  protected void initValues(EStructuralFeature[] allPersistentFeatures)
  {
    values = new Object[allPersistentFeatures.length];
  }

  @Override
  protected Object doGetValue(int featureIndex)
  {
    return values[featureIndex];
  }

  @Override
  protected void doSetValue(int featureIndex, Object value)
  {
    values[featureIndex] = value;
  }

  /**
   * 
   * {@inheritDoc}
   * 
   * @see org.eclipse.emf.cdo.spi.common.revision.AbstractCDORevision#isWritable()
   */
  @Override
  public boolean isWritable()
  {
    // If we are copying another revision (
    if (isCopying)
    {
      return true;
    }
    return super.isWritable();
  }

}