/*
 * Copyright (c) 2010, 2012, 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:
 *     Martin Fluegge - initial API and implementation
 *
 */
package org.eclipse.emf.cdo.dawn.examples.acore.diagram.navigator;

import org.eclipse.emf.cdo.dawn.examples.acore.diagram.part.AcoreDiagramEditorPlugin;

import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.edit.domain.AdapterFactoryEditingDomain;
import org.eclipse.emf.edit.ui.provider.AdapterFactoryContentProvider;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.emf.workspace.util.WorkspaceSynchronizer;

import org.eclipse.core.resources.IFile;
import org.eclipse.gmf.runtime.emf.core.GMFEditingDomainFactory;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.ui.IMemento;
import org.eclipse.ui.navigator.ICommonContentExtensionSite;
import org.eclipse.ui.navigator.ICommonContentProvider;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;

/**
 * @generated
 */
public class AcoreDomainNavigatorContentProvider implements ICommonContentProvider
{

  /**
   * @generated
   */
  private AdapterFactoryContentProvider myAdapterFctoryContentProvier;

  /**
   * @generated
   */
  private static final Object[] EMPTY_ARRAY = new Object[0];

  /**
   * @generated
   */
  private Viewer myViewer;

  /**
   * @generated
   */
  private AdapterFactoryEditingDomain myEditingDomain;

  /**
   * @generated
   */
  private WorkspaceSynchronizer myWorkspaceSynchronizer;

  /**
   * @generated
   */
  private Runnable myViewerRefreshRunnable;

  /**
   * @generated
   */
  public AcoreDomainNavigatorContentProvider()
  {
    myAdapterFctoryContentProvier = new AdapterFactoryContentProvider(
        AcoreDiagramEditorPlugin.getInstance().getItemProvidersAdapterFactory());
    TransactionalEditingDomain editingDomain = GMFEditingDomainFactory.INSTANCE.createEditingDomain();
    myEditingDomain = (AdapterFactoryEditingDomain)editingDomain;
    myEditingDomain.setResourceToReadOnlyMap(new HashMap()
    {
      private static final long serialVersionUID = 1L;

      @Override
      public Object get(Object key)
      {
        if (!containsKey(key))
        {
          put(key, Boolean.TRUE);
        }
        return super.get(key);
      }
    });
    myViewerRefreshRunnable = new Runnable()
    {
      public void run()
      {
        if (myViewer != null)
        {
          myViewer.refresh();
        }
      }
    };
    myWorkspaceSynchronizer = new WorkspaceSynchronizer(editingDomain, new WorkspaceSynchronizer.Delegate()
    {
      public void dispose()
      {
      }

      public boolean handleResourceChanged(final Resource resource)
      {
        for (Iterator it = myEditingDomain.getResourceSet().getResources().iterator(); it.hasNext();)
        {
          Resource nextResource = (Resource)it.next();
          nextResource.unload();
        }
        if (myViewer != null)
        {
          myViewer.getControl().getDisplay().asyncExec(myViewerRefreshRunnable);
        }
        return true;
      }

      public boolean handleResourceDeleted(Resource resource)
      {
        for (Iterator it = myEditingDomain.getResourceSet().getResources().iterator(); it.hasNext();)
        {
          Resource nextResource = (Resource)it.next();
          nextResource.unload();
        }
        if (myViewer != null)
        {
          myViewer.getControl().getDisplay().asyncExec(myViewerRefreshRunnable);
        }
        return true;
      }

      public boolean handleResourceMoved(Resource resource, final URI newURI)
      {
        for (Iterator it = myEditingDomain.getResourceSet().getResources().iterator(); it.hasNext();)
        {
          Resource nextResource = (Resource)it.next();
          nextResource.unload();
        }
        if (myViewer != null)
        {
          myViewer.getControl().getDisplay().asyncExec(myViewerRefreshRunnable);
        }
        return true;
      }
    });
  }

  /**
   * @generated
   */
  public void dispose()
  {
    myWorkspaceSynchronizer.dispose();
    myWorkspaceSynchronizer = null;
    myViewerRefreshRunnable = null;
    for (Iterator it = myEditingDomain.getResourceSet().getResources().iterator(); it.hasNext();)
    {
      Resource resource = (Resource)it.next();
      resource.unload();
    }
    ((TransactionalEditingDomain)myEditingDomain).dispose();
    myEditingDomain = null;
  }

  /**
   * @generated
   */
  public void inputChanged(Viewer viewer, Object oldInput, Object newInput)
  {
    myViewer = viewer;
  }

  /**
   * @generated
   */
  public Object[] getElements(Object inputElement)
  {
    return getChildren(inputElement);
  }

  /**
   * @generated
   */
  public void restoreState(IMemento aMemento)
  {
  }

  /**
   * @generated
   */
  public void saveState(IMemento aMemento)
  {
  }

  /**
   * @generated
   */
  public void init(ICommonContentExtensionSite aConfig)
  {
  }

  /**
   * @generated
   */
  public Object[] getChildren(Object parentElement)
  {
    if (parentElement instanceof IFile)
    {
      IFile file = (IFile)parentElement;
      URI fileURI = URI.createPlatformResourceURI(file.getFullPath().toString(), true);
      Resource resource = myEditingDomain.getResourceSet().getResource(fileURI, true);
      return wrapEObjects(myAdapterFctoryContentProvier.getChildren(resource), parentElement);
    }

    if (parentElement instanceof AcoreDomainNavigatorItem)
    {
      return wrapEObjects(
          myAdapterFctoryContentProvier.getChildren(((AcoreDomainNavigatorItem)parentElement).getEObject()),
          parentElement);
    }
    return EMPTY_ARRAY;
  }

  /**
   * @generated
   */
  public Object[] wrapEObjects(Object[] objects, Object parentElement)
  {
    Collection result = new ArrayList();
    for (int i = 0; i < objects.length; i++)
    {
      if (objects[i] instanceof EObject)
      {
        result.add(new AcoreDomainNavigatorItem((EObject)objects[i], parentElement, myAdapterFctoryContentProvier));
      }
    }
    return result.toArray();
  }

  /**
   * @generated
   */
  public Object getParent(Object element)
  {
    if (element instanceof AcoreAbstractNavigatorItem)
    {
      AcoreAbstractNavigatorItem abstractNavigatorItem = (AcoreAbstractNavigatorItem)element;
      return abstractNavigatorItem.getParent();
    }
    return null;
  }

  /**
   * @generated
   */
  public boolean hasChildren(Object element)
  {
    return element instanceof IFile || getChildren(element).length > 0;
  }

}