2 * Back 2 Browser Bytecode Translator
3 * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, version 2 of the License.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. Look for COPYING file in the top folder.
16 * If not, see http://opensource.org/licenses/GPL-2.0.
18 package org.apidesign.vm4brwsr;
20 import java.io.ByteArrayInputStream;
21 import java.io.IOException;
22 import java.io.InputStream;
24 import org.apidesign.bck2brwsr.core.Exported;
25 import org.apidesign.bck2brwsr.core.JavaScriptBody;
27 /** Conversion from classpath to load function.
29 * @author Jaroslav Tulach <jtulach@netbeans.org>
31 final class ClassPath {
35 public static void init() {
37 @JavaScriptBody(args = { "arr" }, body = "return arr.length;")
38 private static native int length(Object arr);
39 @JavaScriptBody(args = { "arr", "index" }, body = "return arr[index];")
40 private static native Object at(Object arr, int index);
41 @JavaScriptBody(args = { "arr", "index", "value" }, body = "arr[index] = value; return value;")
42 private static native Object set(Object arr, int index, Object value);
44 private static boolean doingToZip;
46 static byte[] loadBytes(String resource, Object classpath, int skip)
47 throws IOException, ClassNotFoundException {
48 for (int i = 0; i < length(classpath); i++) {
49 byte[] arr = loadBytes(resource, classpath, i, skip);
56 @Exported static byte[] loadBytes(String resource, Object classpath, int i, int skip)
57 throws IOException, ClassNotFoundException {
58 Object c = at(classpath, i);
59 if (c instanceof String && !doingToZip) {
62 String url = (String)c;
63 final Bck2Brwsr.Resources z = toZip(url);
64 c = set(classpath, i, z);
65 final byte[] man = readBytes(z, "META-INF/MANIFEST.MF");
67 String mainClass = processClassPathAttr(man, url, classpath);
68 // if (mainClass != null) {
69 // Class.forName(mainClass);
72 } catch (IOException ex) {
73 set(classpath, i, ex);
74 log("Cannot load " + c + " - " + ex.getClass().getName() + ":" + ex.getMessage());
79 if (resource != null) {
81 if (c instanceof Bck2Brwsr.Resources) {
82 checkRes = readBytes((Bck2Brwsr.Resources)c, resource);
83 if (checkRes != null && --skip < 0) {
87 checkRes = callFunction(c, resource, skip);
88 if (checkRes != null) {
96 @JavaScriptBody(args = { "fn", "res", "skip" }, body =
97 "if (typeof fn === 'function') return fn(res, skip);\n"
100 private static native byte[] callFunction(Object fn, String res, int skip);
102 @JavaScriptBody(args = { "msg" }, body = "if (typeof console !== 'undefined') console.log(msg.toString());")
103 private static native void log(String msg);
105 private static String processClassPathAttr(final byte[] man, String url, Object classpath) throws IOException {
106 try (ParseMan is = new ParseMan(new ByteArrayInputStream(man))) {
107 String cp = is.toString();
110 for (int p = 0; p < cp.length();) {
111 int n = cp.indexOf(' ', p);
115 String el = cp.substring(p, n);
116 URL u = new URL(new URL(url), el);
117 classpath = addToArray(classpath, u.toString());
121 return is.getMainClass();
125 private static Object addToArray(Object arr, String value) {
126 final int last = length(arr);
127 Object ret = enlargeArray(arr, last + 1);
128 set(ret, last, value);
132 @JavaScriptBody(args = { "arr", "len" }, body = "while (arr.length < len) arr.push(null); return arr;")
133 private static native Object enlargeArray(Object arr, int len);
135 private static Bck2Brwsr.Resources toZip(String path) throws IOException {
136 URL u = new URL(path);
137 byte[] zipData = (byte[]) u.getContent(new Class[]{byte[].class});
138 Bck2Brwsr.Resources r;
140 Class<?> fastJar = Class.forName("org.apidesign.bck2brwsr.vmzip.ZipResources");
141 return (Bck2Brwsr.Resources) fastJar.getConstructor(byte[].class).newInstance(zipData);
142 } catch (Exception ex) {
143 log("Reading JARs is only possible with enum.zip module included: " + ex.getMessage());
144 ex.printStackTrace();
145 throw new IOException(ex);
149 private static byte[] readBytes(Bck2Brwsr.Resources r, String res) throws IOException {
150 InputStream is = r.get(res);
154 byte[] arr = new byte[is.available()];
157 int len = is.read(arr, off, arr.length - off);