1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ko-fx/src/main/java/org/apidesign/html/kofx/LoadJSON.java Thu Apr 25 16:21:50 2013 +0200
1.3 @@ -0,0 +1,182 @@
1.4 +/**
1.5 + * HTML via Java(tm) Language Bindings
1.6 + * Copyright (C) 2013 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
1.7 + *
1.8 + * This program is free software: you can redistribute it and/or modify
1.9 + * it under the terms of the GNU General Public License as published by
1.10 + * the Free Software Foundation, version 2 of the License.
1.11 + *
1.12 + * This program is distributed in the hope that it will be useful,
1.13 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
1.14 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1.15 + * GNU General Public License for more details. apidesign.org
1.16 + * designates this particular file as subject to the
1.17 + * "Classpath" exception as provided by apidesign.org
1.18 + * in the License file that accompanied this code.
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License
1.21 + * along with this program. Look for COPYING file in the top folder.
1.22 + * If not, see http://wiki.apidesign.org/wiki/GPLwithClassPathException
1.23 + */
1.24 +package org.apidesign.html.kofx;
1.25 +
1.26 +import java.io.IOException;
1.27 +import java.io.InputStreamReader;
1.28 +import java.io.PushbackInputStream;
1.29 +import java.io.Reader;
1.30 +import java.net.MalformedURLException;
1.31 +import java.net.URL;
1.32 +import java.util.Iterator;
1.33 +import java.util.concurrent.Executor;
1.34 +import java.util.concurrent.Executors;
1.35 +import java.util.logging.Level;
1.36 +import java.util.logging.Logger;
1.37 +import javafx.application.Platform;
1.38 +import javafx.scene.web.WebEngine;
1.39 +import netscape.javascript.JSObject;
1.40 +import org.apidesign.html.json.spi.JSONCall;
1.41 +import org.json.JSONArray;
1.42 +import org.json.JSONException;
1.43 +import org.json.JSONObject;
1.44 +import org.json.JSONTokener;
1.45 +
1.46 +/**
1.47 + *
1.48 + * @author Jaroslav Tulach <jtulach@netbeans.org>
1.49 + */
1.50 +final class LoadJSON implements Runnable {
1.51 + private static final Logger LOG = FXContext.LOG;
1.52 + private static final Executor REQ = Executors.newCachedThreadPool();
1.53 +
1.54 + private final JSONCall call;
1.55 + private final URL base;
1.56 + private Throwable error;
1.57 + private Object json;
1.58 +
1.59 +
1.60 + private LoadJSON(JSONCall call) {
1.61 + this.call = call;
1.62 + URL b;
1.63 + try {
1.64 + b = new URL(findBaseURL());
1.65 + } catch (MalformedURLException ex) {
1.66 + LOG.log(Level.SEVERE, "Can't find base url for " + call.composeURL("dummy"), ex);
1.67 + b = null;
1.68 + }
1.69 + this.base = b;
1.70 + }
1.71 +
1.72 + public static void loadJSON(JSONCall call) {
1.73 + REQ.execute(new LoadJSON((call)));
1.74 + }
1.75 +
1.76 + @Override
1.77 + public void run() {
1.78 + if (Platform.isFxApplicationThread()) {
1.79 + if (error != null) {
1.80 + call.notifyError(error);
1.81 + } else {
1.82 + call.notifySuccess(json);
1.83 + }
1.84 + return;
1.85 + }
1.86 + final String url;
1.87 + if (call.isJSONP()) {
1.88 + url = call.composeURL("dummy");
1.89 + } else {
1.90 + url = call.composeURL(null);
1.91 + }
1.92 + try {
1.93 + final URL u = new URL(base, url.replace(" ", "%20"));
1.94 + final PushbackInputStream is = new PushbackInputStream(u.openStream(), 1);
1.95 + boolean array = false;
1.96 + if (call.isJSONP()) {
1.97 + for (;;) {
1.98 + int ch = is.read();
1.99 + if (ch == -1) {
1.100 + break;
1.101 + }
1.102 + if (ch == '[') {
1.103 + is.unread(ch);
1.104 + array = true;
1.105 + break;
1.106 + }
1.107 + if (ch == '{') {
1.108 + is.unread(ch);
1.109 + break;
1.110 + }
1.111 + }
1.112 + } else {
1.113 + int ch = is.read();
1.114 + array = ch == '[';
1.115 + is.unread(ch);
1.116 + }
1.117 + Reader r = new InputStreamReader(is, "UTF-8");
1.118 +
1.119 + JSONTokener tok = new JSONTokener(r);
1.120 + Object obj = array ? new JSONArray(tok) : new JSONObject(tok);
1.121 + json = convertToArray(obj);
1.122 + } catch (JSONException | IOException ex) {
1.123 + error = ex;
1.124 + LOG.log(Level.WARNING, "Cannot connect to " + url, ex);
1.125 + } finally {
1.126 + Platform.runLater(this);
1.127 + }
1.128 + }
1.129 +
1.130 + private static Object convertToArray(Object o) throws JSONException {
1.131 + if (o instanceof JSONArray) {
1.132 + JSONArray ja = (JSONArray)o;
1.133 + Object[] arr = new Object[ja.length()];
1.134 + for (int i = 0; i < arr.length; i++) {
1.135 + arr[i] = convertToArray(ja.get(i));
1.136 + }
1.137 + return arr;
1.138 + } else if (o instanceof JSONObject) {
1.139 + JSONObject obj = (JSONObject)o;
1.140 + Iterator it = obj.keys();
1.141 + while (it.hasNext()) {
1.142 + String key = (String)it.next();
1.143 + obj.put(key, convertToArray(obj.get(key)));
1.144 + }
1.145 + return obj;
1.146 + } else {
1.147 + return o;
1.148 + }
1.149 + }
1.150 +
1.151 + public static void extractJSON(Object jsonObject, String[] props, Object[] values) {
1.152 + if (jsonObject instanceof JSONObject) {
1.153 + JSONObject obj = (JSONObject)jsonObject;
1.154 + for (int i = 0; i < props.length; i++) {
1.155 + try {
1.156 + values[i] = obj.has(props[i]) ? obj.get(props[i]) : null;
1.157 + } catch (JSONException ex) {
1.158 + LoadJSON.LOG.log(Level.SEVERE, "Can't read " + props[i] + " from " + jsonObject, ex);
1.159 + }
1.160 + }
1.161 + }
1.162 + if (jsonObject instanceof JSObject) {
1.163 + JSObject obj = (JSObject)jsonObject;
1.164 + for (int i = 0; i < props.length; i++) {
1.165 + Object val = obj.getMember(props[i]);
1.166 + values[i] = isDefined(val) ? val : null;
1.167 + }
1.168 + }
1.169 + }
1.170 +
1.171 + private static String findBaseURL() {
1.172 + WebEngine eng = (WebEngine) System.getProperties().get("webEngine");
1.173 + return (String) eng.executeScript(
1.174 + "var h;"
1.175 + + "if (!!window && !!window.location && !!window.location.href)\n"
1.176 + + " h = window.location.href;\n"
1.177 + + "else "
1.178 + + " h = null;"
1.179 + + "h\n");
1.180 + }
1.181 +
1.182 + private static boolean isDefined(Object val) {
1.183 + return !"undefined".equals(val);
1.184 + }
1.185 +}