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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
 *    Victor Roldan Betancort - http://bugs.eclipse.org/244801
 *    Simon McDuff - maintenance
 **************************************************************************/
package org.eclipse.emf.cdo.util;

import org.eclipse.emf.internal.cdo.CDOFactoryImpl;

import org.eclipse.net4j.util.io.IORuntimeException;

import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.common.util.TreeIterator;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EAttribute;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.EcoreFactory;
import org.eclipse.emf.ecore.EcorePackage;
import org.eclipse.emf.ecore.EPackage.Registry;
import org.eclipse.emf.ecore.impl.EPackageImpl;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.emf.ecore.xmi.XMIResource;
import org.eclipse.emf.ecore.xmi.impl.EcoreResourceFactoryImpl;
import org.eclipse.emf.ecore.xmi.impl.XMIResourceFactoryImpl;
import org.eclipse.emf.ecore.xmi.impl.XMIResourceImpl;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * @author Eike Stepper
 * @since 2.0
 */
public final class EMFUtil
{
  private static final String ECORE_ENCODING = "ASCII";

  private EMFUtil()
  {
  }

  public static EPackage createEPackage(String name, String nsPrefix, String nsURI)
  {
    EPackage ePackage = EcoreFactory.eINSTANCE.createEPackage();
    ePackage.setName(name);
    ePackage.setNsPrefix(nsPrefix);
    ePackage.setNsURI(nsURI);
    return ePackage;
  }

  public static EClass createEClass(EPackage ePackage, String name, boolean isAbstract, boolean isInterface)
  {
    EClass eClass = EcoreFactory.eINSTANCE.createEClass();
    eClass.setName(name);
    eClass.setAbstract(isAbstract);
    eClass.setInterface(isInterface);
    ePackage.getEClassifiers().add(eClass);
    return eClass;
  }

  public static EAttribute createEAttribute(EClass eClass, String name, EClassifier type)
  {
    EAttribute eAttribute = EcoreFactory.eINSTANCE.createEAttribute();
    eAttribute.setName(name);
    eAttribute.setEType(type);
    eClass.getEStructuralFeatures().add(eAttribute);
    return eAttribute;
  }

  public static EReference createEReference(EClass eClass, String name, EClassifier type, boolean isRequired,
      boolean isMany)
  {
    EReference eReference = EcoreFactory.eINSTANCE.createEReference();
    eReference.setName(name);
    eReference.setEType(type);
    eReference.setLowerBound(isRequired ? 1 : 0);
    eReference.setUpperBound(isMany ? -1 : 0);
    eClass.getEStructuralFeatures().add(eReference);
    return eReference;
  }

  public static ResourceSet newResourceSet(Resource.Factory resourceFactory)
  {
    ResourceSet resourceSet = new ResourceSetImpl();
    resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap().put("*", resourceFactory);
    return resourceSet;
  }

  public static ResourceSet newXMIResourceSet(EPackage... ePackages)
  {
    ResourceSet resourceSet = newResourceSet(new XMIResourceFactoryImpl());
    if (ePackages != null && ePackages.length != 0)
    {
      Registry packageRegistry = resourceSet.getPackageRegistry();
      for (EPackage ePackage : ePackages)
      {
        packageRegistry.put(ePackage.getNsURI(), ePackage);
      }
    }

    return resourceSet;
  }

  public static ResourceSet newEcoreResourceSet(EPackage.Registry packageRegistry)
  {
    ResourceSet resourceSet = newResourceSet(new EcoreResourceFactoryImpl());
    resourceSet.setPackageRegistry(packageRegistry);
    return resourceSet;
  }

  public static ResourceSet newEcoreResourceSet()
  {
    return newEcoreResourceSet(EPackage.Registry.INSTANCE);
  }

  public static EObject load(String fileName, ResourceSet resourceSet)
  {
    Resource resource = resourceSet.getResource(URI.createFileURI(fileName), true);
    return resource.getContents().get(0);
  }

  public static EObject loadXMI(String fileName, EPackage... ePackages)
  {
    ResourceSet resourceSet = newXMIResourceSet(ePackages);
    return load(fileName, resourceSet);
  }

  public static EObject loadXMI(String fileName, EPackage.Registry packageRegistry)
  {
    ResourceSet resourceSet = newXMIResourceSet();
    resourceSet.setPackageRegistry(packageRegistry);
    return load(fileName, resourceSet);
  }

  public static EObject loadEcore(String fileName, EPackage.Registry packageRegistry)
  {
    return load(fileName, newEcoreResourceSet(packageRegistry));
  }

  public static EObject loadEcore(String fileName)
  {
    return load(fileName, newEcoreResourceSet());
  }

  public static void save(String fileName, EObject root, ResourceSet resourceSet)
  {
    save(fileName, Collections.singletonList(root), resourceSet);
  }

  public static void save(String fileName, List<EObject> roots, ResourceSet resourceSet)
  {
    URI uri = URI.createURI(fileName);
    Resource resource = resourceSet.createResource(uri);
    for (EObject root : roots)
    {
      EObject copy = EcoreUtil.copy(root);
      resource.getContents().add(copy);
    }

    try
    {
      resource.save(null);
    }
    catch (IOException ex)
    {
      throw new IORuntimeException(ex);
    }
  }

  public static void saveXMI(String fileName, EObject root)
  {
    save(fileName, root, newXMIResourceSet());
  }

  public static void saveXMI(String fileName, List<EObject> roots)
  {
    save(fileName, roots, newXMIResourceSet());
  }

  public static void saveEcore(String fileName, EObject root)
  {
    save(fileName, root, newEcoreResourceSet());
  }

  public static int countAllContents(EObject eObject)
  {
    int count = 0;
    for (TreeIterator<EObject> it = eObject.eAllContents(); it.hasNext(); it.next())
    {
      ++count;
    }

    return count;
  }

  public static List<EClass> getPersistentClasses(EPackage ePackage)
  {
    List<EClass> result = new ArrayList<EClass>();
    for (EClassifier classifier : ePackage.getEClassifiers())
    {
      if (classifier instanceof EClass)
      {
        result.add((EClass)classifier);
      }
    }

    return result;
  }

  public static List<EStructuralFeature> getPersistentFeatures(EList<EStructuralFeature> eFeatures)
  {
    List<EStructuralFeature> result = new ArrayList<EStructuralFeature>();
    for (EStructuralFeature feature : eFeatures)
    {
      if (feature.isTransient())
      {
        continue;
      }

      // TODO Make configurable via ExtPoint
      if (feature == EcorePackage.eINSTANCE.getEClass_ESuperTypes())
      {
        // See
        // http://www.eclipse.org/newsportal/article.php?id=26780&group=eclipse.tools.emf#26780
        continue;
      }

      if (feature == EcorePackage.eINSTANCE.getETypedElement_EType())
      {
        // See
        // http://www.eclipse.org/newsportal/article.php?id=26780&group=eclipse.tools.emf#26780
        continue;
      }

      if (feature == EcorePackage.eINSTANCE.getEOperation_EExceptions())
      {
        // See
        // http://www.eclipse.org/newsportal/article.php?id=26780&group=eclipse.tools.emf#26780
        continue;
      }

      result.add(feature);
    }

    return result;
  }

  public static boolean isDynamicEPackage(Object value)
  {
    return value.getClass() == EPackageImpl.class;
  }

  /**
   * @since 2.0
   */
  public static boolean prepareDynamicEPackage(EPackage ePackage)
  {
    if (isDynamicEPackage(ePackage))
    {
      ePackage.setEFactoryInstance(new CDOFactoryImpl(ePackage));
      return true;
    }

    return false;
  }

  public static boolean isMany(EStructuralFeature eFeature)
  {
    return eFeature.isMany();
  }

  public static boolean isReference(EStructuralFeature eFeature)
  {
    return eFeature instanceof EReference;
  }

  public static boolean isContainment(EStructuralFeature eFeature)
  {
    if (isReference(eFeature))
    {
      EReference ref = (EReference)eFeature;
      return ref.isContainment();
    }

    return false;
  }

  public static EPackage ePackageFromString(String ecore)
  {
    try
    {
      ByteArrayInputStream stream = new ByteArrayInputStream(ecore.getBytes(ECORE_ENCODING));
      XMIResource resource = new XMIResourceImpl();
      resource.load(stream, null);
      return (EPackage)resource.getContents().get(0);
    }
    catch (RuntimeException ex)
    {
      throw ex;
    }
    catch (IOException ex)
    {
      throw new IORuntimeException(ex);
    }
  }

  public static String ePackageToString(EPackage ePackage, EPackage.Registry packageRegistry)
  {
    synchronized (EMFUtil.class)
    {
      ePackage = (EPackage)EcoreUtil.copy(ePackage);
    }

    Resource.Factory resourceFactory = new XMIResourceFactoryImpl();
    ResourceSetImpl resourceSet = new ResourceSetImpl();

    Resource.Factory.Registry registry = resourceSet.getResourceFactoryRegistry();
    registry.getExtensionToFactoryMap().put("*", resourceFactory);
    registry.getProtocolToFactoryMap().put("*", resourceFactory);

    Resource packageResource = createPackageResource(resourceSet, ePackage);
    ByteArrayOutputStream stream = new ByteArrayOutputStream();

    try
    {
      packageResource.save(stream, null);
      String string = stream.toString(ECORE_ENCODING);
      return string;
    }
    catch (RuntimeException ex)
    {
      throw ex;
    }
    catch (IOException ex)
    {
      throw new IORuntimeException(ex);
    }
  }

  private static Resource createPackageResource(ResourceSetImpl resourceSet, EPackage ePackage)
  {
    URI uri = URI.createURI(ePackage.getNsURI());
    Resource resource = resourceSet.createResource(uri);
    resource.getContents().add(ePackage);
    return resource;
  }
}

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