org.apidesign.bck2brwsr.launcher.fximpl.JVMBridge Maven / Gradle / Ivy
/**
* Back 2 Browser Bytecode Translator
* Copyright (C) 2012-2015 Jaroslav Tulach
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. Look for COPYING file in the top folder.
* If not, see http://opensource.org/licenses/GPL-2.0.
*/
package org.apidesign.bck2brwsr.launcher.fximpl;
import java.io.BufferedReader;
import java.io.Reader;
import java.lang.ref.WeakReference;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.TooManyListenersException;
import java.util.concurrent.Executor;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Platform;
import javafx.beans.value.ChangeListener;
import javafx.scene.web.WebEngine;
import netscape.javascript.JSObject;
import org.netbeans.html.boot.impl.FindResources;
import org.netbeans.html.boot.impl.FnUtils;
import org.netbeans.html.boot.spi.Fn;
/**
*
* @author Jaroslav Tulach
*/
public final class JVMBridge {
static final Logger LOG = Logger.getLogger(JVMBridge.class.getName());
private final WebEngine engine;
private final ClassLoader cl;
private final WebPresenter presenter;
private static ClassLoader[] ldrs;
private static ChangeListener onBck2BrwsrLoad;
JVMBridge(WebEngine eng) {
this.engine = eng;
final ClassLoader p = JVMBridge.class.getClassLoader().getParent();
this.presenter = new WebPresenter();
this.cl = FnUtils.newLoader(presenter, presenter, p);
}
public static void registerClassLoaders(ClassLoader[] loaders) {
ldrs = loaders.clone();
}
public static void addBck2BrwsrLoad(ChangeListener l) throws TooManyListenersException {
if (onBck2BrwsrLoad != null) {
throw new TooManyListenersException();
}
onBck2BrwsrLoad = l;
}
public static void onBck2BrwsrLoad() {
ChangeListener l = onBck2BrwsrLoad;
if (l != null) {
l.changed(null, null, null);
}
}
public Class loadClass(String name) throws ClassNotFoundException {
Fn.activate(presenter);
return Class.forName(name, true, cl);
}
private final class WebPresenter implements Fn.Presenter,
FindResources, Fn.ToJavaScript, Fn.FromJavaScript, Executor, Fn.KeepAlive {
@Override
public void findResources(String name, Collection results, boolean oneIsEnough) {
if (ldrs != null) for (ClassLoader l : ldrs) {
URL u = l.getResource(name);
if (u != null) {
results.add(u);
}
}
}
@Override
public Fn defineFn(String code, String... names) {
return defineJSFn(code, names, null);
}
@Override
public Fn defineFn(String code, String[] names, boolean[] keepAlive) {
return defineJSFn(code, names, keepAlive);
}
private JSFn defineJSFn(String code, String[] names, boolean[] keepAlive) {
StringBuilder sb = new StringBuilder();
sb.append("(function() {");
sb.append(" return function(");
String sep = "";
if (names != null) for (String n : names) {
sb.append(sep).append(n);
sep = ",";
}
sb.append(") {\n");
sb.append(code);
sb.append("};");
sb.append("})()");
JSObject x = (JSObject) engine.executeScript(sb.toString());
return new JSFn(this, x, keepAlive);
}
@Override
public void displayPage(URL page, Runnable onPageLoad) {
throw new UnsupportedOperationException("Not supported yet.");
}
@Override
public void loadScript(Reader code) throws Exception {
BufferedReader r = new BufferedReader(code);
StringBuilder sb = new StringBuilder();
for (;;) {
String l = r.readLine();
if (l == null) {
break;
}
sb.append(l).append('\n');
}
engine.executeScript(sb.toString());
}
@Override
public Object toJava(Object js) {
if (js instanceof Weak) {
js = ((Weak)js).get();
}
return checkArray(js);
}
@Override
public Object toJavaScript(Object toReturn) {
if (toReturn instanceof Object[]) {
return convertArrays((Object[]) toReturn);
}
return toReturn;
}
@Override
public void execute(Runnable command) {
if (Platform.isFxApplicationThread()) {
command.run();
} else {
Platform.runLater(command);
}
}
final JSObject convertArrays(Object[] arr) {
for (int i = 0; i < arr.length; i++) {
if (arr[i] instanceof Object[]) {
arr[i] = convertArrays((Object[]) arr[i]);
}
}
final JSObject wrapArr = (JSObject) wrapArrFn().call("array", arr); // NOI18N
return wrapArr;
}
private JSObject wrapArrImpl;
private final JSObject wrapArrFn() {
if (wrapArrImpl == null) {
try {
wrapArrImpl = (JSObject) defineJSFn(" var k = {};"
+ " k.array= function() {"
+ " return Array.prototype.slice.call(arguments);"
+ " };"
+ " return k;", null, null
).invokeImpl(null, false);
} catch (Exception ex) {
throw new IllegalStateException(ex);
}
}
return wrapArrImpl;
}
final Object checkArray(Object val) {
int length = ((Number) arraySizeFn().call("array", val, null)).intValue();
if (length == -1) {
return val;
}
Object[] arr = new Object[length];
arraySizeFn().call("array", val, arr);
return arr;
}
private JSObject arraySize;
private final JSObject arraySizeFn() {
if (arraySize == null) {
try {
arraySize = (JSObject) defineJSFn(" var k = {};"
+ " k.array = function(arr, to) {"
+ " if (to === null) {"
+ " if (Object.prototype.toString.call(arr) === '[object Array]') return arr.length;"
+ " else return -1;"
+ " } else {"
+ " var l = arr.length;"
+ " for (var i = 0; i < l; i++) to[i] = arr[i];"
+ " return l;"
+ " }"
+ " };"
+ " return k;", null, null
).invokeImpl(null, false);
} catch (Exception ex) {
throw new IllegalStateException(ex);
}
}
return arraySize;
}
}
private static final class JSFn extends Fn {
private final JSObject fn;
private final boolean[] keepAlive;
private JSFn(WebPresenter cl, JSObject fn, boolean[] keepAlive) {
super(cl);
this.fn = fn;
this.keepAlive = keepAlive;
}
@Override
public Object invoke(Object thiz, Object... args) throws Exception {
return invokeImpl(thiz, true, args);
}
final Object invokeImpl(Object thiz, boolean arrayChecks, Object... args) throws Exception {
try {
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