TclTestingPropertyTester.java

/*******************************************************************************
 * Copyright (c) 2009, 2017 xored software, Inc. 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:
 *     xored software, Inc. - initial API and Implementation (Alex Panchenko)
 *******************************************************************************/
package org.eclipse.dltk.tcl.internal.testing;

import org.eclipse.core.expressions.PropertyTester;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.dltk.core.DLTKCore;
import org.eclipse.dltk.core.IModelElement;
import org.eclipse.dltk.core.ISourceModule;
import org.eclipse.dltk.tcl.testing.ITclTestingEngine;

public class TclTestingPropertyTester extends PropertyTester {

	private static final String PROPERTY_IS_TEST = "isTest"; //$NON-NLS-1$

	private static final String PROPERTY_CAN_LAUNCH_AS_JUNIT_TEST = "canLaunchAsTest"; //$NON-NLS-1$

	@Override
	public boolean test(Object receiver, String property, Object[] args, Object expectedValue) {
		if (!(receiver instanceof IAdaptable)) {
			throw new IllegalArgumentException("Element must be of type 'IAdaptable', is " + receiver == null ? "null" //$NON-NLS-1$ //$NON-NLS-2$
					: receiver.getClass().getName());
		}
		IModelElement element;
		if (receiver instanceof IModelElement) {
			element = (IModelElement) receiver;
		} else if (receiver instanceof IResource) {
			element = DLTKCore.create((IResource) receiver);
			if (element == null) {
				return false;
			}
		} else { // is IAdaptable
			element = ((IAdaptable) receiver).getAdapter(IModelElement.class);
			if (element == null) {
				IResource resource = ((IAdaptable) receiver).getAdapter(IResource.class);
				element = DLTKCore.create(resource);
				if (element == null) {
					return false;
				}
			}
		}
		if (PROPERTY_IS_TEST.equals(property)) {
			return isTest(element);
		} else if (PROPERTY_CAN_LAUNCH_AS_JUNIT_TEST.equals(property)) {
			return canLaunchAsTest(element);
		}
		throw new IllegalArgumentException("Unknown test property '" + property + "'"); //$NON-NLS-1$ //$NON-NLS-2$
	}

	private boolean canLaunchAsTest(IModelElement element) {
		switch (element.getElementType()) {
		case IModelElement.SCRIPT_PROJECT:
		case IModelElement.PROJECT_FRAGMENT:
		case IModelElement.SCRIPT_FOLDER:
			return true; // can run, let test runner detect if there are tests
		case IModelElement.SOURCE_MODULE:
			return isTest(element);
		default:
			return false;
		}
	}

	/*
	 * Return whether the target resource is a JUnit test.
	 */
	private boolean isTest(IModelElement element) {
		if (element instanceof ISourceModule) {
			final ISourceModule module = (ISourceModule) element;
			for (ITclTestingEngine engine : TclTestingEngineManager.getEngines()) {
				if (engine.isValidModule(module)) {
					return true;
				}
			}
		}
		return false;
	}
}