001 /*
002 * Sonar, open source software quality management tool.
003 * Copyright (C) 2008-2011 SonarSource
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 /*-{
061 var callback = "callback" + requestId;
062
063 // create SCRIPT tag, and set SRC attribute equal to JSON feed URL + callback function name
064 var script = document.createElement("script");
065 script.setAttribute("src", url + callback);
066 script.setAttribute("type", "text/javascript");
067
068 window[callback] = function(jsonObj) {
069 @org.sonar.gwt.JsonUtils::dispatchJSON(Lcom/google/gwt/core/client/JavaScriptObject;Lorg/sonar/gwt/JsonUtils$JSONHandler;)(jsonObj, handler);
070 window[callback + "done"] = true;
071 }
072
073 setTimeout(function() {
074 if (!window[callback + "done"]) {
075 handler.@org.sonar.gwt.JsonUtils.JSONHandler::onTimeout();
076 }
077
078 // cleanup
079 document.body.removeChild(script);
080 if (window[callback]) {
081 delete window[callback];
082 }
083 if (window[callback + "done"]) {
084 delete window[callback + "done"];
085 }
086 }, 120000);
087
088 document.body.appendChild(script);
089 }-*/;
090
091 public static void dispatchJSON(JavaScriptObject jsonObj, JSONHandler handler) {
092 JSONObject obj = new JSONObject(jsonObj);
093 if (obj.isObject() != null) {
094 if (obj.containsKey("err_code")) {
095 handler.onError(new Double(obj.get("err_code").isNumber().doubleValue()).intValue(),
096 obj.get("err_msg").isString().stringValue());
097 return;
098 }
099 }
100 handler.onResponse(jsonObj);
101 }
102
103 public static String getString(JSONObject json, String field) {
104 return getAsString(json.get(field));
105 }
106
107 public static Date getDate(JSONObject json, String field) {
108 String date = getString(json, field);
109 if (date != null) {
110 return parseDateTime(date);
111 }
112 return null;
113 }
114
115 public static Boolean getBoolean(JSONObject json, String field) {
116 JSONValue jsonValue;
117 JSONBoolean jsonBoolean;
118 if ((jsonValue = json.get(field)) == null) {
119 return null;
120 }
121 if ((jsonBoolean = jsonValue.isBoolean()) == null) {
122 return null;
123 }
124 return jsonBoolean.booleanValue();
125 }
126
127 public static Double getDouble(JSONObject json, String field) {
128 JSONValue jsonValue;
129 JSONNumber jsonNumber;
130 if ((jsonValue = json.get(field)) == null) {
131 return null;
132 }
133 if ((jsonNumber = jsonValue.isNumber()) == null) {
134 return null;
135 }
136 return jsonNumber.doubleValue();
137 }
138
139 public static Integer getInteger(JSONObject json, String field) {
140 final Double d = getDouble(json, field);
141 if (d != null) {
142 return d.intValue();
143 }
144 return null;
145 }
146
147 public static JSONObject getArray(JSONValue json, int i) {
148 if (json instanceof JSONArray) {
149 return ((JSONArray) json).get(i).isObject();
150 }
151 if (json instanceof JSONObject) {
152 return ((JSONObject) json).get(Integer.toString(i)).isObject();
153 }
154 throw new JavaScriptException("Not implemented");
155 }
156
157 public static int getArraySize(JSONValue array) {
158 if (array instanceof JSONArray) {
159 return ((JSONArray) array).size();
160 }
161 if (array instanceof JSONObject) {
162 return ((JSONObject) array).size();
163 }
164 throw new JavaScriptException("Not implemented");
165 }
166
167 public static String getAsString(JSONValue jsonValue) {
168 if (jsonValue == null) {
169 return null;
170 }
171 JSONString jsonString;
172 if ((jsonString = jsonValue.isString()) == null) {
173 JSONNumber jsonNumber = jsonValue.isNumber();
174 return jsonNumber != null ? jsonNumber.toString() : null;
175 }
176 return jsonString.stringValue();
177 }
178
179 public static Double getAsDouble(JSONValue jsonValue) {
180 if (jsonValue == null) {
181 return null;
182 }
183 JSONNumber jsonNumber;
184 if ((jsonNumber = jsonValue.isNumber()) == null) {
185 JSONString jsonString = jsonValue.isString();
186 return jsonString != null ? Double.parseDouble(jsonString.toString()) : null;
187 }
188 return jsonNumber.doubleValue();
189 }
190
191 /**
192 * @since 2.5
193 */
194 public static Date parseDateTime(String dateTime) {
195 DateTimeFormat frmt = DateTimeFormat.getFormat("yyyy-MM-dd'T'HH:mm:ssZ");
196 if (dateTime.endsWith("Z") && dateTime.length() > 2) {
197 // see SONAR-1182
198 dateTime = dateTime.substring(0, dateTime.length() - 2) + "+0000";
199 }
200 return frmt.parse(dateTime);
201 }
202
203 }