jaroslav@201: /**
jaroslav@201:  * Back 2 Browser Bytecode Translator
jaroslav@201:  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
jaroslav@201:  *
jaroslav@201:  * This program is free software: you can redistribute it and/or modify
jaroslav@201:  * it under the terms of the GNU General Public License as published by
jaroslav@201:  * the Free Software Foundation, version 2 of the License.
jaroslav@201:  *
jaroslav@201:  * This program is distributed in the hope that it will be useful,
jaroslav@201:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
jaroslav@201:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
jaroslav@201:  * GNU General Public License for more details.
jaroslav@201:  *
jaroslav@201:  * You should have received a copy of the GNU General Public License
jaroslav@201:  * along with this program. Look for COPYING file in the top folder.
jaroslav@201:  * If not, see http://opensource.org/licenses/GPL-2.0.
jaroslav@201:  */
jaroslav@201: package org.apidesign.vm4brwsr;
jaroslav@201: 
jaroslav@201: import java.io.IOException;
jaroslav@201: import java.io.InputStream;
jaroslav@277: import java.util.Set;
jaroslav@277: import java.util.TreeSet;
jaroslav@201: import javax.script.Invocable;
jaroslav@201: import javax.script.ScriptContext;
jaroslav@201: import javax.script.ScriptEngine;
jaroslav@201: import javax.script.ScriptException;
jaroslav@201: import org.testng.annotations.BeforeClass;
jaroslav@201: import static org.testng.Assert.*;
jaroslav@201: import org.testng.annotations.Test;
jaroslav@201: 
jaroslav@201: /** Implements loading class by class.
jaroslav@201:  *
jaroslav@201:  * @author Jaroslav Tulach <jtulach@netbeans.org>
jaroslav@201:  */
jaroslav@201: public class VMLazyTest {
jaroslav@201: 
jaroslav@201:     
jaroslav@201:     private static CharSequence codeSeq;
jaroslav@201:     private static Invocable code;
jaroslav@201: 
jaroslav@201:     @BeforeClass
jaroslav@201:     public void compileTheCode() throws Exception {
jaroslav@201:         StringBuilder sb = new StringBuilder();
jaroslav@277:         sb.append("\nvar data = {};");
jaroslav@277:         sb.append("\nfunction test(clazz, method) {");
jaroslav@277:         sb.append("\n  if (!data.bck2brwsr) data.bck2brwsr = bck2brwsr(function(name) { return loader.get(name); });");
jaroslav@277:         sb.append("\n  var c = data.bck2brwsr.loadClass(clazz);");
jaroslav@201:         sb.append("\n  return c[method]();");
jaroslav@201:         sb.append("\n}");
jaroslav@201:         
jaroslav@201:         
jaroslav@277:        
jaroslav@201:         ScriptEngine[] arr = { null };
jaroslav@201:         code = StaticMethodTest.compileClass(sb, arr,
jaroslav@277:             "org/apidesign/vm4brwsr/GenJS"
jaroslav@201:         );
jaroslav@201:         arr[0].getContext().setAttribute("loader", new FindBytes(), ScriptContext.ENGINE_SCOPE);
jaroslav@201:         codeSeq = sb;
jaroslav@201:     }
jaroslav@201:     
jaroslav@201:     @Test public void invokeStaticMethod() throws Exception {
jaroslav@201:         assertExec("Trying to get -1", "test", Double.valueOf(-1),
jaroslav@277:             StaticMethod.class.getName(), "minusOne__I"
jaroslav@201:         );
jaroslav@201:     }
jaroslav@214: 
jaroslav@214:     @Test public void loadDependantClass() throws Exception {
jaroslav@277:         assertExec("Expecting zero", "test", Double.valueOf(0),
jaroslav@277:             InstanceSub.class.getName(), "recallDbl__D"
jaroslav@214:         );
jaroslav@214:     }
jaroslav@201: 
jaroslav@201:     private static void assertExec(String msg, String methodName, Object expRes, Object... args) throws Exception {
jaroslav@201:         Object ret = null;
jaroslav@201:         try {
jaroslav@201:             ret = code.invokeFunction(methodName, args);
jaroslav@201:         } catch (ScriptException ex) {
jaroslav@201:             fail("Execution failed in\n" + StaticMethodTest.dumpJS(codeSeq), ex);
jaroslav@201:         } catch (NoSuchMethodException ex) {
jaroslav@201:             fail("Cannot find method in\n" + StaticMethodTest.dumpJS(codeSeq), ex);
jaroslav@201:         }
jaroslav@201:         if (ret == null && expRes == null) {
jaroslav@201:             return;
jaroslav@201:         }
jaroslav@201:         if (expRes.equals(ret)) {
jaroslav@201:             return;
jaroslav@201:         }
jaroslav@215:         assertEquals(ret, expRes, msg + "was: " + ret + "\n" + StaticMethodTest.dumpJS(codeSeq));
jaroslav@201:     }
jaroslav@201: 
jaroslav@201:     public static final class FindBytes {
jaroslav@277:         private static Set<String> requested = new TreeSet<String>();
jaroslav@277:         
jaroslav@201:         public byte[] get(String name) throws IOException {
jaroslav@277:             if (!requested.add(name)) {
jaroslav@277:                 throw new IllegalStateException("Requested for second time: " + name);
jaroslav@277:             }
jaroslav@277:             
jaroslav@201:             InputStream is = VMLazyTest.class.getClassLoader().getResourceAsStream(name);
jaroslav@201:             if (is == null) {
jaroslav@201:                 throw new IOException("Can't find " + name);
jaroslav@201:             }
jaroslav@201:             byte[] arr = new byte[is.available()];
jaroslav@201:             int len = is.read(arr);
jaroslav@201:             if (len != arr.length) {
jaroslav@201:                 throw new IOException("Read only " + len + " wanting " + arr.length);
jaroslav@201:             }
jaroslav@215:             /*
jaroslav@201:             System.err.print("loader['" + name + "'] = [");
jaroslav@201:             for (int i = 0; i < arr.length; i++) {
jaroslav@201:                 if (i > 0) {
jaroslav@201:                     System.err.print(", ");
jaroslav@201:                 }
jaroslav@201:                 System.err.print(arr[i]);
jaroslav@201:             }
jaroslav@201:             System.err.println("]");
jaroslav@215:             */
jaroslav@201:             return arr;
jaroslav@201:         }
jaroslav@201:     }
jaroslav@201: }