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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.launcher.impl;
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import java.io.IOException;
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import java.io.InputStream;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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import java.net.URL;
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import java.util.Enumeration;
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import org.apidesign.bck2brwsr.core.JavaScriptBody;
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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 class Console {
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private Console() {
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}
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static {
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turnAssetionStatusOn();
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}
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@JavaScriptBody(args = {"id", "attr"}, body =
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"return window.document.getElementById(id)[attr].toString();")
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private static native Object getAttr(String id, String attr);
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@JavaScriptBody(args = {"id", "attr", "value"}, body =
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"window.document.getElementById(id)[attr] = value;")
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private static native void setAttr(String id, String attr, Object value);
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@JavaScriptBody(args = {}, body = "return; window.close();")
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private static native void closeWindow();
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private static void log(String newText) {
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String id = "bck2brwsr.result";
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String attr = "value";
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setAttr(id, attr, getAttr(id, attr) + "\n" + newText);
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setAttr(id, "scrollTop", getAttr(id, "scrollHeight"));
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}
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public static void execute() throws Exception {
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String clazz = (String) getAttr("clazz", "value");
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String method = (String) getAttr("method", "value");
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Object res = invokeMethod(clazz, method);
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setAttr("bck2brwsr.result", "value", res);
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}
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@JavaScriptBody(args = { "url", "callback", "arr" }, body = ""
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+ "var request = new XMLHttpRequest();\n"
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+ "request.open('GET', url, true);\n"
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+ "request.onreadystatechange = function() {\n"
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+ " if (this.readyState!==4) return;\n"
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+ " arr[0] = this.responseText;\n"
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+ " callback.run__V();\n"
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+ "};"
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+ "request.send();"
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)
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private static native void loadText(String url, Runnable callback, String[] arr) throws IOException;
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public static void harness(String url) throws IOException {
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log("Connecting to " + url);
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Request r = new Request(url);
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}
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private static class Request implements Runnable {
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private final String[] arr = { null };
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private final String url;
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private Request(String url) throws IOException {
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this.url = url;
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loadText(url, this, arr);
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}
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@Override
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public void run() {
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try {
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String data = arr[0];
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log("\nGot \"" + data + "\"");
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if (data == null) {
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log("Some error exiting");
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closeWindow();
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return;
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}
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if (data.isEmpty()) {
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log("No data, exiting");
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closeWindow();
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return;
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}
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Case c = Case.parseData(data);
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if (c.getHtmlFragment() != null) {
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setAttr("bck2brwsr.fragment", "innerHTML", c.getHtmlFragment());
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}
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log("Invoking " + c.getClassName() + '.' + c.getMethodName() + " as request: " + c.getRequestId());
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Object result = invokeMethod(c.getClassName(), c.getMethodName());
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setAttr("bck2brwsr.fragment", "innerHTML", "");
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log("Result: " + result);
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result = encodeURL("" + result);
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log("Sending back: " + url + "?request=" + c.getRequestId() + "&result=" + result);
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String u = url + "?request=" + c.getRequestId() + "&result=" + result;
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loadText(u, this, arr);
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} catch (Exception ex) {
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log(ex.getClass().getName() + ":" + ex.getMessage());
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}
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}
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}
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private static String encodeURL(String r) {
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < r.length(); i++) {
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int ch = r.charAt(i);
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if (ch < 32 || ch == '%' || ch == '+') {
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sb.append("%").append(("0" + Integer.toHexString(ch)).substring(0, 2));
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} else {
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if (ch == 32) {
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sb.append("+");
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} else {
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sb.append((char)ch);
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}
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}
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}
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return sb.toString();
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}
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static String invoke(String clazz, String method) throws ClassNotFoundException, InvocationTargetException, IllegalAccessException, InstantiationException {
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final Object r = invokeMethod(clazz, method);
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return r == null ? "null" : r.toString().toString();
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}
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/** Helper method that inspects the classpath and loads given resource
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* (usually a class file). Used while running tests in Rhino.
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*
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* @param name resource name to find
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* @return the array of bytes in the given resource
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* @throws IOException I/O in case something goes wrong
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*/
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public static byte[] read(String name) throws IOException {
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URL u = null;
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Enumeration<URL> en = Console.class.getClassLoader().getResources(name);
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while (en.hasMoreElements()) {
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u = en.nextElement();
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}
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if (u == null) {
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throw new IOException("Can't find " + name);
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}
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try (InputStream is = u.openStream()) {
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byte[] arr;
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arr = new byte[is.available()];
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int offset = 0;
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while (offset < arr.length) {
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int len = is.read(arr, offset, arr.length - offset);
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if (len == -1) {
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throw new IOException("Can't read " + name);
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}
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offset += len;
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}
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return arr;
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}
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}
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private static Object invokeMethod(String clazz, String method)
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throws ClassNotFoundException, InvocationTargetException,
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SecurityException, IllegalAccessException, IllegalArgumentException,
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InstantiationException {
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Method found = null;
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Class<?> c = Class.forName(clazz);
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for (Method m : c.getMethods()) {
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if (m.getName().equals(method)) {
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found = m;
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}
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}
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Object res;
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if (found != null) {
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try {
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if ((found.getModifiers() & Modifier.STATIC) != 0) {
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res = found.invoke(null);
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} else {
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res = found.invoke(c.newInstance());
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}
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} catch (Throwable ex) {
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res = ex.getClass().getName() + ":" + ex.getMessage();
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}
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} else {
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res = "Can't find method " + method + " in " + clazz;
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}
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return res;
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}
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@JavaScriptBody(args = {}, body = "vm.desiredAssertionStatus = true;")
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private static void turnAssetionStatusOn() {
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}
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private static final class Case {
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private final Object data;
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private Case(Object data) {
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this.data = data;
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}
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public static Case parseData(String s) {
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return new Case(toJSON(s));
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}
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public String getMethodName() {
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return value("methodName", data);
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}
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public String getClassName() {
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return value("className", data);
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}
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public String getRequestId() {
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return value("request", data);
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}
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public String getHtmlFragment() {
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return value("html", data);
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}
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@JavaScriptBody(args = "s", body = "return eval('(' + s + ')');")
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private static native Object toJSON(String s);
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@JavaScriptBody(args = {"p", "d"}, body =
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"var v = d[p];\n"
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+ "if (typeof v === 'undefined') return null;\n"
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+ "return v.toString();"
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)
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private static native String value(String p, Object d);
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}
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}
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