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.bck2brwsr.emul.reflect;
20 import java.lang.reflect.Array;
21 import java.lang.reflect.Constructor;
22 import java.lang.reflect.Method;
23 import java.util.Enumeration;
24 import org.apidesign.bck2brwsr.core.JavaScriptBody;
26 /** Utilities to work on methods.
28 * @author Jaroslav Tulach <jtulach@netbeans.org>
30 public abstract class MethodImpl {
31 public static MethodImpl INSTANCE;
34 Class.forName(Method.class.getName());
35 } catch (ClassNotFoundException ex) {
36 throw new IllegalStateException(ex);
40 protected abstract Method create(Class<?> declaringClass, String name, Object data, String sig);
41 protected abstract Constructor create(Class<?> declaringClass, Object data, String sig);
45 // bck2brwsr implementation
48 @JavaScriptBody(args = {"clazz", "prefix", "cnstr"},
50 + "var c = clazz.cnstr;\n"
51 + "if (!cnstr) c = c.prototype;"
52 + "var arr = new Array();\n"
54 + " if (m.indexOf(prefix) === 0) {\n"
55 + " if (!c[m].cls) continue;\n"
57 + " arr.push(c[m]);\n"
58 + " arr.push(c[m].cls.$class);\n"
62 private static native Object[] findMethodData(
63 Class<?> clazz, String prefix, boolean cnstr);
65 public static Constructor findConstructor(
66 Class<?> clazz, Class<?>... parameterTypes) {
67 Object[] data = findMethodData(clazz, "cons__", true);
68 BIG: for (int i = 0; i < data.length; i += 3) {
69 String sig = ((String) data[i]).substring(6);
70 Class<?> cls = (Class<?>) data[i + 2];
71 Constructor tmp = INSTANCE.create(cls, data[i + 1], sig);
72 Class<?>[] tmpParms = tmp.getParameterTypes();
73 if (parameterTypes.length != tmpParms.length) {
76 for (int j = 0; j < tmpParms.length; j++) {
77 if (!parameterTypes[j].equals(tmpParms[j])) {
86 public static Constructor[] findConstructors(Class<?> clazz, int mask) {
87 Object[] namesAndData = findMethodData(clazz, "", true);
89 for (int i = 0; i < namesAndData.length; i += 3) {
90 String sig = (String) namesAndData[i];
91 Object data = namesAndData[i + 1];
92 if (!sig.startsWith("cons__")) {
95 sig = sig.substring(6);
96 Class<?> cls = (Class<?>) namesAndData[i + 2];
97 final Constructor m = INSTANCE.create(cls, data, sig);
98 if ((m.getModifiers() & mask) == 0) {
101 namesAndData[cnt++] = m;
103 Constructor[] arr = new Constructor[cnt];
104 for (int i = 0; i < cnt; i++) {
105 arr[i] = (Constructor) namesAndData[i];
109 public static Method findMethod(
110 Class<?> clazz, String name, Class<?>... parameterTypes) {
111 Object[] data = findMethodData(clazz, name + "__", false);
112 BIG: for (int i = 0; i < data.length; i += 3) {
113 String sig = ((String) data[i]).substring(name.length() + 2);
114 Class<?> cls = (Class<?>) data[i + 2];
115 Method tmp = INSTANCE.create(cls, name, data[i + 1], sig);
116 Class<?>[] tmpParms = tmp.getParameterTypes();
117 if (parameterTypes.length != tmpParms.length) {
120 for (int j = 0; j < tmpParms.length; j++) {
121 if (!parameterTypes[j].equals(tmpParms[j])) {
130 public static Method[] findMethods(Class<?> clazz, int mask) {
131 Object[] namesAndData = findMethodData(clazz, "", false);
133 for (int i = 0; i < namesAndData.length; i += 3) {
134 String sig = (String) namesAndData[i];
135 Object data = namesAndData[i + 1];
136 int middle = sig.indexOf("__");
140 String name = sig.substring(0, middle);
141 sig = sig.substring(middle + 2);
142 Class<?> cls = (Class<?>) namesAndData[i + 2];
143 final Method m = INSTANCE.create(cls, name, data, sig);
144 if ((m.getModifiers() & mask) == 0) {
147 namesAndData[cnt++] = m;
149 Method[] arr = new Method[cnt];
150 for (int i = 0; i < cnt; i++) {
151 arr[i] = (Method) namesAndData[i];
155 static String toSignature(Method m) {
156 StringBuilder sb = new StringBuilder();
157 sb.append(m.getName()).append("__");
158 appendType(sb, m.getReturnType());
159 Class<?>[] arr = m.getParameterTypes();
160 for (int i = 0; i < arr.length; i++) {
161 appendType(sb, arr[i]);
163 return sb.toString();
166 private static void appendType(StringBuilder sb, Class<?> type) {
167 if (type == Integer.TYPE) {
171 if (type == Long.TYPE) {
175 if (type == Double.TYPE) {
179 if (type == Float.TYPE) {
183 if (type == Byte.TYPE) {
187 if (type == Boolean.TYPE) {
191 if (type == Short.TYPE) {
195 if (type == Void.TYPE) {
199 if (type == Character.TYPE) {
203 if (type.isArray()) {
205 appendType(sb, type.getComponentType());
208 sb.append('L').append(type.getName().replace('.', '_'));
212 public static int signatureElements(String sig) {
213 Enumeration<Class> en = signatureParser(sig);
215 while (en.hasMoreElements()) {
222 public static Enumeration<Class> signatureParser(final String sig) {
223 class E implements Enumeration<Class> {
226 public boolean hasMoreElements() {
227 return pos < sig.length();
230 public Class nextElement() {
231 switch (sig.charAt(pos++)) {
249 return Character.TYPE;
252 int up = sig.indexOf("_2", pos);
253 String type = sig.substring(pos, up);
255 return Class.forName(type.replace('_', '.'));
256 } catch (ClassNotFoundException ex) {
257 throw new IllegalStateException(ex);
260 char nch = sig.charAt(pos++);
261 assert nch == '3' : "Can't find '3' at " + sig.substring(pos - 1);
262 final Class compType = nextElement();
263 return Array.newInstance(compType, 0).getClass();
266 throw new UnsupportedOperationException(sig + " at " + pos);