org.eclipse.emf.eson.building.NewObjectExtensions.java Source code

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Here is the source code for org.eclipse.emf.eson.building.NewObjectExtensions.java

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/*
 * #%L
 * org.eclipse.emf.eson
 * %%
 * Copyright (C) 2015 Michael Vorburger 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
 * #L%
 */
package org.eclipse.emf.eson.building;

import org.apache.log4j.Logger;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.emf.eson.eFactory.Feature;
import org.eclipse.emf.eson.eFactory.NewObject;
import org.eclipse.xtext.EcoreUtil2;

import com.google.common.base.Optional;

public class NewObjectExtensions {
    private static Logger logger = Logger.getLogger(NewObjectExtensions.class);

    // see also org.eclipse.emf.eson.serialization.ContainmentBuilder.nullifyEClassIfDefault(NewObject)

    public Optional<EClass> getDeclaredOrInferredEClass(NewObject newObject) {
        EClass eClass = newObject.getEClass();

        if (eClass == null) {
            Feature newObjectFeature = EcoreUtil2.getContainerOfType(newObject, Feature.class);
            if (newObjectFeature != null) {
                EStructuralFeature eFeature = newObjectFeature.getEFeature();
                if (!(eFeature instanceof EReference))
                    return Optional.absent();
                EReference eReference = (EReference) eFeature;
                eClass = eReference.getEReferenceType();
            } else {
                // Do NOT logger.error here!
                return Optional.absent();
            }
        }
        if (eClass.getEPackage() == null) {
            EcoreUtil.resolve(newObject.eClass(), newObject);
        }
        if (eClass.eIsProxy()) {
            if (logger.isDebugEnabled())
                logger.debug("The EClass for NewObject " + getNewObjectDescriptionForErrorMessage(newObject)
                        + " is still an unresolved EMF Proxy, something isn't working in your cross-Resource reference resolution");
            return Optional.absent();
        }
        EPackage ePackage = eClass.getEPackage();
        if (ePackage == null) {
            logger.error("No EPackage registered for EClass '" + eClass.getName() + "' defined in NewObject "
                    + getNewObjectDescriptionForErrorMessage(newObject));
            return Optional.absent();
        }

        return Optional.of(eClass);
    }

    protected String getNewObjectDescriptionForErrorMessage(NewObject newObject) {
        return "name '" + newObject.getName() + "' at URI " + newObject.eResource().getURI() + "#"
                + newObject.eResource().getURIFragment(newObject);
    }

}