plugins/cdo/bundles/org.eclipse.papyrus.cdo.core/src/org/eclipse/papyrus/cdo/core/resource/CDOReadOnlyHandler.java

/*****************************************************************************
 * Copyright (c) 2013, 2017 CEA LIST and others.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *   CEA LIST - Initial API and implementation
 *   Christian W. Damus (CEA) - bug 429826
 *   Eike Stepper (CEA) - bug 466520
 *
 *****************************************************************************/
package org.eclipse.papyrus.cdo.core.resource;

import java.util.Set;

import org.eclipse.emf.cdo.CDOObject;
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.EditingDomain;
import org.eclipse.papyrus.cdo.internal.core.CDOUtils;
import org.eclipse.papyrus.infra.core.resource.AbstractReadOnlyHandler;
import org.eclipse.papyrus.infra.core.resource.ReadOnlyAxis;

import com.google.common.base.Optional;

/**
 * The CDO read handler is permission-based.
 */
public class CDOReadOnlyHandler extends AbstractReadOnlyHandler {

	public CDOReadOnlyHandler(EditingDomain editingDomain) {
		super(editingDomain);
	}

	@Override
	public Optional<Boolean> anyReadOnly(Set<ReadOnlyAxis> axes, URI[] uris) {
		Optional<Boolean> result = Optional.absent();

		if (axes.contains(ReadOnlyAxis.PERMISSION) && (uris.length > 0) && CDOUtils.isCDOEditingDomain(getEditingDomain())) {
			for (int i = 0; !result.or(Boolean.FALSE) && (i < uris.length); i++) {
				// if it's a cdo:// URI, then I have a definitive answer
				if (CDOUtils.isCDOURI(uris[i])) {
					result = Optional.of(isReadOnly(uris[i]));
				}
			}
		}

		return result;
	}

	protected boolean isReadOnly(URI uri) {
		boolean result = false;

		Resource resource = getEditingDomain().getResourceSet().getResource(uri.trimFragment(), false);
		if (resource instanceof CDOObject) {
			result = CDOUtils.isReadOnly((CDOObject) resource);
		}

		return result;
	}

	@Override
	public Optional<Boolean> isReadOnly(Set<ReadOnlyAxis> axes, EObject eObject) {
		Optional<Boolean> result = Optional.absent();

		if (axes.contains(ReadOnlyAxis.PERMISSION)) {
			Resource resource = eObject.eResource();
			if ((resource == null) || CDOUtils.isCDOURI(resource.getURI())) {
				CDOObject cdo = CDOUtils.getCDOObject(eObject);
				if (cdo != null) {
					// I have a definitive answer for CDO objects
					result = Optional.of(CDOUtils.isReadOnly(cdo));
				}
			}
		}

		return result;
	}

	@Override
	public Optional<Boolean> makeWritable(Set<ReadOnlyAxis> axes, URI[] uris) {
		// CDO requires the administrative UI to edit user permissions
		return Optional.absent();
	}

	@Override
	public Optional<Boolean> makeWritable(Set<ReadOnlyAxis> axes, EObject eObject) {
		// CDO requires the administrative UI to edit user permissions
		return Optional.absent();
	}
}