001 /*
002 * Sonar, open source software quality management tool.
003 * Copyright (C) 2009 SonarSource SA
004 * mailto:contact AT sonarsource DOT com
005 *
006 * Sonar is free software; you can redistribute it and/or
007 * modify it under the terms of the GNU Lesser General Public
008 * License as published by the Free Software Foundation; either
009 * version 3 of the License, or (at your option) any later version.
010 *
011 * Sonar is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 * Lesser General Public License for more details.
015 *
016 * You should have received a copy of the GNU Lesser General Public
017 * License along with Sonar; if not, write to the Free Software
018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02
019 */
020 package org.sonar.gwt;
021
022 import com.google.gwt.core.client.JavaScriptException;
023 import com.google.gwt.core.client.JavaScriptObject;
024 import com.google.gwt.http.client.URL;
025 import com.google.gwt.i18n.client.DateTimeFormat;
026 import com.google.gwt.json.client.*;
027
028 import java.util.Date;
029
030 public final class JsonUtils {
031 private static int requestId = 0;
032
033 private JsonUtils() {
034 // only static methods
035 }
036
037 public interface JSONHandler {
038 void onResponse(JavaScriptObject obj);
039
040 void onTimeout();
041
042 void onError(int errorCode, String errorMessage);
043 }
044
045 public static void requestJson(String url, JSONHandler handler) {
046 if (!url.endsWith("&") && !url.endsWith("?")) {
047 url += "&";
048 }
049 if (!url.contains("format=json")) {
050 url += "format=json&";
051 }
052 if (!url.contains("callback=")) {
053 //IMPORTANT : the url should ended with ?callback= or &callback= for JSONP calls
054 url += "callback=";
055 }
056 makeJSONRequest(requestId++, URL.encode(url), handler);
057 }
058
059 public static native void makeJSONRequest(int requestId, String url, JSONHandler handler) /*-{
060 var callback = "callback" + requestId;
061
062 // create SCRIPT tag, and set SRC attribute equal to JSON feed URL + callback function name
063 var script = document.createElement("script");
064 script.setAttribute("src", url + callback);
065 script.setAttribute("type", "text/javascript");
066
067 window[callback] = function(jsonObj) {
068 @org.sonar.gwt.JsonUtils::dispatchJSON(Lcom/google/gwt/core/client/JavaScriptObject;Lorg/sonar/gwt/JsonUtils$JSONHandler;)(jsonObj, handler);
069 window[callback + "done"] = true;
070 }
071
072 setTimeout(function() {
073 if (!window[callback + "done"]) {
074 handler.@org.sonar.gwt.JsonUtils.JSONHandler::onTimeout();
075 }
076
077 // cleanup
078 document.body.removeChild(script);
079 if (window[callback]) {
080 delete window[callback];
081 }
082 if (window[callback + "done"]) {
083 delete window[callback + "done"];
084 }
085 }, 120000);
086
087 document.body.appendChild(script);
088 }-*/;
089
090 public static void dispatchJSON(JavaScriptObject jsonObj, JSONHandler handler) {
091 JSONObject obj = new JSONObject(jsonObj);
092 if (obj.isObject() != null) {
093 if (obj.containsKey("err_code")) {
094 handler.onError(new Double(obj.get("err_code").isNumber().doubleValue()).intValue(),
095 obj.get("err_msg").isString().stringValue());
096 return;
097 }
098 }
099 handler.onResponse(jsonObj);
100 }
101
102 public static String getString(JSONObject json, String field) {
103 JSONValue jsonValue;
104 JSONString jsonString;
105 if ((jsonValue = json.get(field)) == null) {
106 return null;
107 }
108 if ((jsonString = jsonValue.isString()) == null) {
109 JSONNumber jsonNumber = jsonValue.isNumber();
110 return jsonNumber != null ? jsonNumber.toString() : null;
111 }
112 return jsonString.stringValue();
113 }
114
115 public static Date getDate(JSONObject json, String field) {
116 String date = getString(json, field);
117 if (date != null) {
118 DateTimeFormat frmt = DateTimeFormat.getFormat("yyyy-MM-dd'T'HH:mm:ssZ");
119 if (date.endsWith("Z") && date.length() > 2) {
120 // see SONAR-1182
121 date = date.substring(0, date.length() - 2) + "+0000";
122 }
123 return frmt.parse(date);
124 }
125 return null;
126 }
127
128 public static Boolean getBoolean(JSONObject json, String field) {
129 JSONValue jsonValue;
130 JSONBoolean jsonBoolean;
131 if ((jsonValue = json.get(field)) == null) {
132 return null;
133 }
134 if ((jsonBoolean = jsonValue.isBoolean()) == null) {
135 return null;
136 }
137 return jsonBoolean.booleanValue();
138 }
139
140 public static Double getDouble(JSONObject json, String field) {
141 JSONValue jsonValue;
142 JSONNumber jsonNumber;
143 if ((jsonValue = json.get(field)) == null) {
144 return null;
145 }
146 if ((jsonNumber = jsonValue.isNumber()) == null) {
147 return null;
148 }
149 return jsonNumber.doubleValue();
150 }
151
152 public static Integer getInteger(JSONObject json, String field) {
153 final Double d = getDouble(json, field);
154 if (d != null) {
155 return d.intValue();
156 }
157 return null;
158 }
159
160 public static JSONObject getArray(JSONValue json, int i) {
161 if (json instanceof JSONArray) {
162 return ((JSONArray) json).get(i).isObject();
163 }
164 if (json instanceof JSONObject) {
165 return ((JSONObject) json).get(Integer.toString(i)).isObject();
166 }
167 throw new JavaScriptException("Not implemented");
168 }
169
170 public static int getArraySize(JSONValue array) {
171 if (array instanceof JSONArray) {
172 return ((JSONArray) array).size();
173 }
174 if (array instanceof JSONObject) {
175 return ((JSONObject) array).size();
176 }
177 throw new JavaScriptException("Not implemented");
178 }
179
180 }
181