/*******************************************************************************
 * Copyright (c) 2000, 2006 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.junit.ui;

import org.eclipse.core.runtime.IAdaptable;

import org.eclipse.core.expressions.PropertyTester;

import org.eclipse.jdt.core.IClassFile;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IMember;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.Signature;

import org.eclipse.jdt.internal.junit.util.TestSearchEngine;

/**
 * Contributes an "isTest" property for ITypes.
 */
public class JavaTypeExtender extends PropertyTester  {
	private static final String PROPERTY_IS_Test= "isTest"; //$NON-NLS-1$
	/**
	 * @inheritDoc
	 */
	public boolean test(Object receiver, String method, Object[] args, Object expectedValue) {
		IJavaElement javaElement = null;
		if (receiver instanceof IAdaptable) {
			javaElement = (IJavaElement) ((IAdaptable)receiver).getAdapter(IJavaElement.class);
		}
		if (javaElement != null) {
			if (!javaElement.exists()) {
				return false;
			}
		}
		if (javaElement != null) {
			if (PROPERTY_IS_Test.equals(method)) { 
				return isTest(javaElement);
			}
		}
		return false;
	}

	private boolean isTest(IJavaElement element) {
		try {
			IType testType = null;
			if (element instanceof ICompilationUnit) {
				ICompilationUnit cu = (ICompilationUnit) element;
				testType= cu.getType(Signature.getQualifier(cu.getElementName()));
			} else if (element instanceof IClassFile) {
					testType = ((IClassFile)element).getType();
			} else if (element instanceof IType) {
				testType = (IType) element;
			} else if (element instanceof IMember) {
				testType = ((IMember)element).getDeclaringType();
			}
			if (testType != null && testType.exists() && TestSearchEngine.isTestOrTestSuite(testType)) {
				return true;
			}
		} catch (JavaModelException e) {
		}
		return false;
	}	
}