1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/emul/mini/src/main/java/org/apidesign/bck2brwsr/emul/MethodImpl.java Wed Jan 23 20:39:23 2013 +0100
1.3 @@ -0,0 +1,164 @@
1.4 +/*
1.5 + * Copyright (c) 1996, 2006, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +package org.apidesign.bck2brwsr.emul;
1.29 +
1.30 +import java.lang.reflect.Method;
1.31 +import java.util.Enumeration;
1.32 +import org.apidesign.bck2brwsr.core.JavaScriptBody;
1.33 +
1.34 +/** Utilities to work on methods.
1.35 + *
1.36 + * @author Jaroslav Tulach <jtulach@netbeans.org>
1.37 + */
1.38 +public abstract class MethodImpl {
1.39 + public static MethodImpl INSTANCE;
1.40 + static {
1.41 + try {
1.42 + Class.forName(Method.class.getName());
1.43 + } catch (ClassNotFoundException ex) {
1.44 + throw new IllegalStateException(ex);
1.45 + }
1.46 + }
1.47 +
1.48 + protected abstract Method create(Class<?> declaringClass, String name, Object data, String sig);
1.49 +
1.50 +
1.51 + //
1.52 + // bck2brwsr implementation
1.53 + //
1.54 +
1.55 + @JavaScriptBody(args = {"clazz", "prefix"},
1.56 + body = ""
1.57 + + "var c = clazz.cnstr.prototype;"
1.58 + + "var arr = new Array();\n"
1.59 + + "for (m in c) {\n"
1.60 + + " if (m.indexOf(prefix) === 0) {\n"
1.61 + + " arr.push(m);\n"
1.62 + + " arr.push(c[m]);\n"
1.63 + + " }"
1.64 + + "}\n"
1.65 + + "return arr;")
1.66 + private static native Object[] findMethodData(
1.67 + Class<?> clazz, String prefix);
1.68 +
1.69 + public static Method findMethod(
1.70 + Class<?> clazz, String name, Class<?>... parameterTypes) {
1.71 + Object[] data = findMethodData(clazz, name + "__");
1.72 + BIG: for (int i = 0; i < data.length; i += 2) {
1.73 + String sig = ((String) data[0]).substring(name.length() + 2);
1.74 + Method tmp = INSTANCE.create(clazz, name, data[1], sig);
1.75 + Class<?>[] tmpParms = tmp.getParameterTypes();
1.76 + if (parameterTypes.length != tmpParms.length) {
1.77 + continue;
1.78 + }
1.79 + for (int j = 0; j < tmpParms.length; j++) {
1.80 + if (!parameterTypes[j].equals(tmpParms[j])) {
1.81 + continue BIG;
1.82 + }
1.83 + }
1.84 + return tmp;
1.85 + }
1.86 + return null;
1.87 + }
1.88 +
1.89 + public static Method[] findMethods(Class<?> clazz, int mask) {
1.90 + Object[] namesAndData = findMethodData(clazz, "");
1.91 + int cnt = 0;
1.92 + for (int i = 0; i < namesAndData.length; i += 2) {
1.93 + String sig = (String) namesAndData[i];
1.94 + Object data = namesAndData[i + 1];
1.95 + int middle = sig.indexOf("__");
1.96 + if (middle == -1) {
1.97 + continue;
1.98 + }
1.99 + String name = sig.substring(0, middle);
1.100 + sig = sig.substring(middle + 2);
1.101 + final Method m = INSTANCE.create(clazz, name, data, sig);
1.102 + if ((m.getModifiers() & mask) == 0) {
1.103 + continue;
1.104 + }
1.105 + namesAndData[cnt++] = m;
1.106 + }
1.107 + Method[] arr = new Method[cnt];
1.108 + for (int i = 0; i < cnt; i++) {
1.109 + arr[i] = (Method) namesAndData[i];
1.110 + }
1.111 + return arr;
1.112 + }
1.113 +
1.114 + public static int signatureElements(String sig) {
1.115 + Enumeration<Class> en = signatureParser(sig);
1.116 + int cnt = 0;
1.117 + while (en.hasMoreElements()) {
1.118 + en.nextElement();
1.119 + cnt++;
1.120 + }
1.121 + return cnt;
1.122 + }
1.123 +
1.124 + public static Enumeration<Class> signatureParser(final String sig) {
1.125 + class E implements Enumeration<Class> {
1.126 + int pos;
1.127 +
1.128 + public boolean hasMoreElements() {
1.129 + return pos < sig.length();
1.130 + }
1.131 +
1.132 + public Class nextElement() {
1.133 + switch (sig.charAt(pos++)) {
1.134 + case 'I':
1.135 + return Integer.TYPE;
1.136 + case 'J':
1.137 + return Long.TYPE;
1.138 + case 'D':
1.139 + return Double.TYPE;
1.140 + case 'F':
1.141 + return Float.TYPE;
1.142 + case 'B':
1.143 + return Byte.TYPE;
1.144 + case 'Z':
1.145 + return Boolean.TYPE;
1.146 + case 'S':
1.147 + return Short.TYPE;
1.148 + case 'V':
1.149 + return Void.TYPE;
1.150 + case 'C':
1.151 + return Character.TYPE;
1.152 + case 'L':
1.153 + try {
1.154 + int up = sig.indexOf("_2");
1.155 + String type = sig.substring(1, up);
1.156 + pos = up + 2;
1.157 + return Class.forName(type);
1.158 + } catch (ClassNotFoundException ex) {
1.159 + // should not happen
1.160 + }
1.161 + }
1.162 + throw new UnsupportedOperationException(sig + " at " + pos);
1.163 + }
1.164 + }
1.165 + return new E();
1.166 + }
1.167 +}