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/*****************************************************************************
* Copyright (c) 2015 Christian W. Damus 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:
* Christian W. Damus - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.junit.utils.rules;
import static org.hamcrest.CoreMatchers.notNullValue;
import static org.hamcrest.MatcherAssert.assertThat;
import java.net.URL;
import java.util.Iterator;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.plugin.EcorePlugin;
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.papyrus.junit.utils.JUnitUtils;
import org.junit.rules.TestWatcher;
import org.junit.runner.Description;
import com.google.common.collect.Iterables;
/**
* A {@link ResourceSet} fixture rule that is compatible with stand-alone JUnit
* execution (not in an Eclipse instance). It uses the {@link JavaResource}
* annotation (only, not also {@link PluginResource}) to identify test resources
* to load into the resource set on set-up.
*
* @param <T>
* the kind of model fixture element to load
*/
public class StandaloneResourceSetFixture<T extends EObject> extends TestWatcher {
private final Class<? extends T> modelType;
private ResourceSet resourceSet;
private Resource resource;
private T model;
/**
* Initializes me with the kind of model fixture element to load.
*
* @param modelType
* the model fixture element's type
*/
public StandaloneResourceSetFixture(Class<? extends T> modelType) {
super();
this.modelType = modelType;
}
/**
* Obtains the resource set in which the {@linkplain #getModel() model fixture} is loaded.
*
* @see #getModel()
*/
public ResourceSet getResourceSet() {
return resourceSet;
}
/**
* Obtains the resource containing the {@linkplain #getModel() model fixture}.
*
* @see #getModel()
*/
public Resource getResource() {
return resource;
}
public Resource getResource(URI uri, boolean loadOnDemand) {
return getResourceSet().getResource(uri, loadOnDemand);
}
/**
* Obtains the model fixture.
*/
public T getModel() {
return model;
}
/**
* Obtains the root model element of the specified type from my resource set.
*
* @param modelType
* the type of model to retrieve, or {@code null} if none is found
*/
public <E extends EObject> E getModel(Class<E> modelType) {
E result = null;
Resource resource;
for (Iterator<Resource> iter = resourceSet.getResources().iterator(); (result == null) && iter.hasNext();) {
resource = iter.next();
result = Iterables.getFirst(Iterables.filter(resource.getContents(), modelType), null);
}
return result;
}
public static <T extends EObject> StandaloneResourceSetFixture<T> create(Class<T> modelType) {
return new StandaloneResourceSetFixture<>(modelType);
}
@Override
protected void starting(Description description) {
JavaResource annotation = JUnitUtils.getAnnotation(description, JavaResource.class);
assertThat("No @JavaResource annotation found in test case.", annotation, notNullValue());
resourceSet = new ResourceSetImpl();
if (!EcorePlugin.IS_ECLIPSE_RUNNING) {
// EMF ensures that additional invocations have no effect
EcorePlugin.ExtensionProcessor.process(null);
}
final Class<?> testClass = JUnitUtils.getTestClass(description);
for (String next : annotation.value()) {
resourceSet.getResource(getTestResourceURI(next, testClass), true);
}
model = getModel(modelType);
assertThat("No model of type " + modelType.getSimpleName() + " loaded.", model, notNullValue());
resource = model.eResource();
}
@Override
protected void finished(Description description) {
for (Iterator<Resource> iter = resourceSet.getResources().iterator(); iter.hasNext();) {
Resource next = iter.next();
next.unload();
iter.remove();
next.eAdapters().clear();
}
resourceSet.eAdapters().clear();
resourceSet = null;
resource = null;
model = null;
}
/**
* Obtains the URI of a test resource.
*
* @param path
* the path of the test resource. Absolute paths are searched on the classpath
* and relative paths are searched relative to the given {@code context} class
* @param context
* the context class for resolution of relative resource paths
*
* @return the URI of the referenced test resource
*/
protected URI getTestResourceURI(String path, Class<?> context) {
URL resultURL;
IPath resourcePath = new Path(path);
if (resourcePath.isAbsolute()) {
resultURL = context.getClassLoader().getResource(path);
} else {
resultURL = context.getResource(path);
}
return URI.createURI(resultURL.toString(), true);
}
}
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