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/**
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* Back 2 Browser Bytecode Translator
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* Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. Look for COPYING file in the top folder.
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* If not, see http://opensource.org/licenses/GPL-2.0.
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*/
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package org.apidesign.bck2brwsr.emul.reflect;
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import java.lang.reflect.Array;
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import java.lang.reflect.Method;
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import java.util.Enumeration;
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import org.apidesign.bck2brwsr.core.JavaScriptBody;
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/** Utilities to work on methods.
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*
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* @author Jaroslav Tulach <jtulach@netbeans.org>
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*/
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public abstract class MethodImpl {
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public static MethodImpl INSTANCE;
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static {
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try {
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Class.forName(Method.class.getName());
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} catch (ClassNotFoundException ex) {
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throw new IllegalStateException(ex);
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}
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}
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protected abstract Method create(Class<?> declaringClass, String name, Object data, String sig);
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//
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// bck2brwsr implementation
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//
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@JavaScriptBody(args = {"clazz", "prefix"},
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body = ""
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+ "var c = clazz.cnstr.prototype;"
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+ "var arr = new Array();\n"
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+ "for (m in c) {\n"
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+ " if (m.indexOf(prefix) === 0) {\n"
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+ " if (!c[m].cls) continue;\n"
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+ " arr.push(m);\n"
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+ " arr.push(c[m]);\n"
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+ " arr.push(c[m].cls.$class);\n"
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+ " }"
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+ "}\n"
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+ "return arr;")
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private static native Object[] findMethodData(
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Class<?> clazz, String prefix);
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public static Method findMethod(
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Class<?> clazz, String name, Class<?>... parameterTypes) {
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Object[] data = findMethodData(clazz, name + "__");
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BIG: for (int i = 0; i < data.length; i += 3) {
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String sig = ((String) data[i]).substring(name.length() + 2);
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Class<?> cls = (Class<?>) data[i + 2];
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Method tmp = INSTANCE.create(cls, name, data[i + 1], sig);
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Class<?>[] tmpParms = tmp.getParameterTypes();
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if (parameterTypes.length != tmpParms.length) {
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continue;
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}
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for (int j = 0; j < tmpParms.length; j++) {
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if (!parameterTypes[j].equals(tmpParms[j])) {
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continue BIG;
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}
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}
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return tmp;
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}
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return null;
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}
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public static Method[] findMethods(Class<?> clazz, int mask) {
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Object[] namesAndData = findMethodData(clazz, "");
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int cnt = 0;
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for (int i = 0; i < namesAndData.length; i += 3) {
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String sig = (String) namesAndData[i];
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Object data = namesAndData[i + 1];
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int middle = sig.indexOf("__");
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if (middle == -1) {
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continue;
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}
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String name = sig.substring(0, middle);
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sig = sig.substring(middle + 2);
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Class<?> cls = (Class<?>) namesAndData[i + 2];
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final Method m = INSTANCE.create(cls, name, data, sig);
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if ((m.getModifiers() & mask) == 0) {
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continue;
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}
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namesAndData[cnt++] = m;
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}
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Method[] arr = new Method[cnt];
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for (int i = 0; i < cnt; i++) {
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arr[i] = (Method) namesAndData[i];
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}
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return arr;
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}
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static String toSignature(Method m) {
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StringBuilder sb = new StringBuilder();
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sb.append(m.getName()).append("__");
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appendType(sb, m.getReturnType());
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Class<?>[] arr = m.getParameterTypes();
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for (int i = 0; i < arr.length; i++) {
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appendType(sb, arr[i]);
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}
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return sb.toString();
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}
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private static void appendType(StringBuilder sb, Class<?> type) {
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if (type == Integer.TYPE) {
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sb.append('I');
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return;
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}
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if (type == Long.TYPE) {
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sb.append('J');
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return;
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}
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if (type == Double.TYPE) {
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sb.append('D');
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return;
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}
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if (type == Float.TYPE) {
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sb.append('F');
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return;
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}
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if (type == Byte.TYPE) {
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sb.append('B');
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return;
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}
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if (type == Boolean.TYPE) {
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sb.append('Z');
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return;
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}
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if (type == Short.TYPE) {
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sb.append('S');
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return;
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}
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if (type == Void.TYPE) {
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sb.append('V');
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return;
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}
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if (type == Character.TYPE) {
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sb.append('C');
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return;
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}
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if (type.isArray()) {
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sb.append("_3");
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appendType(sb, type.getComponentType());
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return;
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}
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sb.append('L').append(type.getName().replace('.', '_'));
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sb.append("_2");
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}
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public static int signatureElements(String sig) {
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Enumeration<Class> en = signatureParser(sig);
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int cnt = 0;
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while (en.hasMoreElements()) {
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en.nextElement();
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cnt++;
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}
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return cnt;
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}
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public static Enumeration<Class> signatureParser(final String sig) {
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class E implements Enumeration<Class> {
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int pos;
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public boolean hasMoreElements() {
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return pos < sig.length();
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}
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public Class nextElement() {
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switch (sig.charAt(pos++)) {
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case 'I':
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return Integer.TYPE;
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case 'J':
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return Long.TYPE;
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case 'D':
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return Double.TYPE;
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case 'F':
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return Float.TYPE;
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case 'B':
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return Byte.TYPE;
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case 'Z':
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return Boolean.TYPE;
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case 'S':
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return Short.TYPE;
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case 'V':
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return Void.TYPE;
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case 'C':
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return Character.TYPE;
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case 'L':
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try {
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int up = sig.indexOf("_2", pos);
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String type = sig.substring(pos, up);
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pos = up + 2;
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return Class.forName(type.replace('_', '.'));
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} catch (ClassNotFoundException ex) {
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throw new IllegalStateException(ex);
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}
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case '_': {
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char nch = sig.charAt(pos++);
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assert nch == '3' : "Can't find '3' at " + sig.substring(pos - 1);
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final Class compType = nextElement();
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return Array.newInstance(compType, 0).getClass();
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}
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}
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throw new UnsupportedOperationException(sig + " at " + pos);
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}
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}
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return new E();
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}
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}
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