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/*
 * Copyright (c) 2004-2014 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.explorer;

import org.eclipse.emf.cdo.eresource.CDOResource;
import org.eclipse.emf.cdo.eresource.CDOResourceNode;
import org.eclipse.emf.cdo.explorer.checkouts.CDOCheckout;
import org.eclipse.emf.cdo.explorer.checkouts.CDOCheckoutManager;
import org.eclipse.emf.cdo.explorer.repositories.CDORepositoryManager;
import org.eclipse.emf.cdo.internal.explorer.bundle.OM;
import org.eclipse.emf.cdo.view.CDOView;

import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.util.EcoreUtil;

import java.util.LinkedList;

/**
 * @author Eike Stepper
 * @since 4.4
 */
public final class CDOExplorerUtil
{
  public static CDORepositoryManager getRepositoryManager()
  {
    return OM.getRepositoryManager();
  }

  public static CDOCheckoutManager getCheckoutManager()
  {
    return OM.getCheckoutManager();
  }

  public static CDOCheckout getCheckout(EObject object)
  {
    return walkUp(object, null);
  }

  public static EObject getParent(EObject object)
  {
    EObject container = object.eContainer();
    if (container != null)
    {
      return container;
    }

    if (object instanceof CDOResource)
    {
      CDOResource resource = (CDOResource)object;
      if (resource.isRoot())
      {
        return null;
      }
    }

    Resource resource = object.eResource();
    if (resource instanceof CDOResource)
    {
      return (CDOResource)resource;
    }

    if (object instanceof CDOResourceNode)
    {
      CDOView view = ((CDOResourceNode)object).cdoView();
      if (view != null)
      {
        return view.getRootResource();
      }
    }

    return null;
  }

  public static LinkedList<EObject> getPath(EObject object)
  {
    LinkedList<EObject> path = new LinkedList<EObject>();
    if (walkUp(object, path) != null)
    {
      return path;
    }

    return null;
  }

  private static CDOCheckout walkUp(EObject object, LinkedList<EObject> path)
  {
    while (object != null)
    {
      if (path != null)
      {
        path.addFirst(object);
      }

      Adapter adapter = EcoreUtil.getAdapter(object.eAdapters(), CDOCheckout.class);
      if (adapter != null)
      {
        return (CDOCheckout)adapter;
      }

      object = getParent(object);
    }

    return null;
  }
}

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