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/**
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* HTML via Java(tm) Language Bindings
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* Copyright (C) 2013 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. apidesign.org
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* designates this particular file as subject to the
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* "Classpath" exception as provided by apidesign.org
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* in the License file that accompanied this code.
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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://wiki.apidesign.org/wiki/GPLwithClassPathException
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*/
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package org.apidesign.html.boot.impl;
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import java.lang.reflect.Method;
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import java.net.URL;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Enumeration;
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import java.util.List;
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import org.apidesign.html.boot.spi.Fn;
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import org.objectweb.asm.Type;
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/**
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*
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* @author Jaroslav Tulach <jtulach@netbeans.org>
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*/
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public final class FnUtils {
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private FnUtils() {
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}
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public static Fn define(Class<?> caller, String code, String... names) {
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JsClassLoader cl = (JsClassLoader)caller.getClassLoader();
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return cl.defineFn(code, names);
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}
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public static ClassLoader newLoader(final FindResources f, final Fn.Presenter d, ClassLoader parent) {
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return new JsClassLoader(parent) {
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@Override
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protected URL findResource(String name) {
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List<URL> l = res(name, true);
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return l.isEmpty() ? null : l.get(0);
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}
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@Override
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protected Enumeration<URL> findResources(String name) {
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return Collections.enumeration(res(name, false));
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}
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private List<URL> res(String name, boolean oneIsEnough) {
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List<URL> l = new ArrayList<URL>();
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f.findResources(name, l, oneIsEnough);
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return l;
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}
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@Override
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protected Fn defineFn(String code, String... names) {
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return d.defineFn(code, names);
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}
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};
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}
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static String callback(String body, ClassLoader loader) {
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try {
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return callbackImpl(body, loader);
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} catch (ClassNotFoundException ex) {
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throw new IllegalStateException("Can't parse " + body, ex);
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} catch (NoSuchMethodException ex) {
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throw new IllegalStateException("Can't parse " + body, ex);
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}
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}
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private static String callbackImpl(String body, ClassLoader loader)
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throws ClassNotFoundException, NoSuchMethodException {
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StringBuilder sb = new StringBuilder();
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int pos = 0;
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for (;;) {
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int next = body.indexOf(".@", pos);
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if (next == -1) {
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sb.append(body.substring(pos));
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return sb.toString();
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}
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sb.append(body.substring(pos, next));
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int sigBeg = body.indexOf('(', next);
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int sigEnd = body.indexOf(')', sigBeg);
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int colon4 = body.indexOf("::", next);
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if (sigBeg == -1 || sigEnd == -1 || colon4 == -1) {
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throw new IllegalStateException("Malformed body " + body);
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}
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String fqn = body.substring(next + 2, colon4);
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String method = body.substring(colon4 + 2, sigBeg);
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String params = body.substring(sigBeg, sigEnd + 1);
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Class<?> clazz = Class.forName(fqn, false, loader);
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final Type[] argTps = Type.getArgumentTypes(params);
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Class<?>[] argCls = new Class<?>[argTps.length];
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for (int i = 0; i < argCls.length; i++) {
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argCls[i] = toClass(argTps[i], loader);
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}
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Method m = clazz.getMethod(method, argCls);
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sb.append("['").append(m.getName()).append("(");
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String sep = "";
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for (Class<?> pt : m.getParameterTypes()) {
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sb.append(sep).append(pt.getName());
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sep = ",";
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}
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sb.append(")']");
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pos = sigEnd + 1;
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}
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}
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private static Class<?> toClass(final Type t, ClassLoader loader) throws ClassNotFoundException {
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if (t == Type.INT_TYPE) {
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return Integer.TYPE;
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} else if (t == Type.VOID_TYPE) {
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return Void.TYPE;
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} else if (t == Type.BOOLEAN_TYPE) {
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return Boolean.TYPE;
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} else if (t == Type.BYTE_TYPE) {
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return Byte.TYPE;
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} else if (t == Type.CHAR_TYPE) {
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return Character.TYPE;
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} else if (t == Type.SHORT_TYPE) {
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return Short.TYPE;
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} else if (t == Type.DOUBLE_TYPE) {
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return Double.TYPE;
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} else if (t == Type.FLOAT_TYPE) {
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return Float.TYPE;
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} else if (t == Type.LONG_TYPE) {
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return Long.TYPE;
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}
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return Class.forName(t.getClassName(), false, loader);
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}
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}
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