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/**
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* Back 2 Browser Bytecode Translator
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* Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. Look for COPYING file in the top folder.
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* If not, see http://opensource.org/licenses/GPL-2.0.
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*/
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package org.apidesign.vm4brwsr;
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import java.lang.reflect.Method;
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import javax.script.Invocable;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import org.testng.Assert;
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import org.testng.ITest;
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import org.testng.annotations.Factory;
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import org.testng.annotations.Test;
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/** A TestNG {@link Factory} that seeks for {@link Compare} annotations
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* in provided class and builds set of tests that compare the computations
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* in real as well as JavaScript virtual machines. Use as:<pre>
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* {@code @}{@link Factory} public static create() {
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* return @{link CompareVMs}.{@link #create(YourClass.class);
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* }</pre>
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*
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* @author Jaroslav Tulach <jtulach@netbeans.org>
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*/
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public final class CompareVMs implements ITest {
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private final Method m;
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private final boolean js;
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private final CompareVMs first, second;
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private Object value;
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private static Invocable code;
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private static CharSequence codeSeq;
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private CompareVMs(Method m, boolean js) {
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this.m = m;
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this.js = js;
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this.first = null;
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this.second = null;
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}
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private CompareVMs(Method m, CompareVMs first, CompareVMs second) {
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this.first = first;
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this.second = second;
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this.m = m;
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this.js = false;
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}
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private static void compileTheCode(Class<?> clazz) throws Exception {
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if (code != null) {
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return;
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}
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StringBuilder sb = new StringBuilder();
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class SkipMe extends GenJS {
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public SkipMe(Appendable out) {
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super(out);
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}
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@Override
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protected boolean requireReference(String cn) {
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if (cn.contains("CompareVMs")) {
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return true;
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}
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return super.requireReference(cn);
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}
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}
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SkipMe sm = new SkipMe(sb);
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sm.doCompile(CompareVMs.class.getClassLoader(), StringArray.asList(
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clazz.getName().replace('.', '/')
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));
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ScriptEngineManager sem = new ScriptEngineManager();
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ScriptEngine js = sem.getEngineByExtension("js");
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Object res = js.eval(sb.toString());
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Assert.assertTrue(js instanceof Invocable, "It is invocable object: " + res);
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code = (Invocable)js;
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codeSeq = sb;
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}
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public static Object[] create(Class<?> clazz) {
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Method[] arr = clazz.getMethods();
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Object[] ret = new Object[3 * arr.length];
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int cnt = 0;
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for (Method m : arr) {
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Compare c = m.getAnnotation(Compare.class);
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if (c == null) {
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continue;
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}
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final CompareVMs real = new CompareVMs(m, false);
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final CompareVMs js = new CompareVMs(m, true);
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ret[cnt++] = real;
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ret[cnt++] = js;
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ret[cnt++] = new CompareVMs(m, real, js);
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}
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Object[] r = new Object[cnt];
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for (int i = 0; i < cnt; i++) {
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r[i] = ret[i];
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}
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return r;
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}
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@Test public void runTest() throws Throwable {
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if (first != null) {
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Object v1 = first.value;
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Object v2 = second.value;
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if (v1 instanceof Number) {
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v1 = ((Number)v1).doubleValue();
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}
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Assert.assertEquals(v1, v2, "Comparing results");
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} else {
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if (js) {
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try {
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compileTheCode(m.getDeclaringClass());
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Object vm = code.invokeFunction("bck2brwsr");
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Object inst = code.invokeMethod(vm, "loadClass", m.getDeclaringClass().getName().replace('.', '_'));
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value = code.invokeMethod(inst, m.getName() + "__I");
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} catch (Exception ex) {
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throw new AssertionError(StaticMethodTest.dumpJS(codeSeq)).initCause(ex);
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}
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} else {
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value = m.invoke(m.getDeclaringClass().newInstance());
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}
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}
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}
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@Override
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public String getTestName() {
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if (first != null) {
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return m.getName() + "[Compare]";
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}
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return m.getName() + (js ? "[JavaScript]" : "[Java]");
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}
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}
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