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.api.web.gwt.client.webservices;
021
022 import java.util.Date;
023
024 import com.google.gwt.core.client.JavaScriptException;
025 import com.google.gwt.core.client.JavaScriptObject;
026 import com.google.gwt.http.client.URL;
027 import com.google.gwt.i18n.client.DateTimeFormat;
028 import com.google.gwt.json.client.JSONArray;
029 import com.google.gwt.json.client.JSONBoolean;
030 import com.google.gwt.json.client.JSONNumber;
031 import com.google.gwt.json.client.JSONObject;
032 import com.google.gwt.json.client.JSONString;
033 import com.google.gwt.json.client.JSONValue;
034
035 public final class JsonUtils {
036 private static int requestId = 0;
037
038 private JsonUtils() {
039
040 }
041
042 public interface JSONHandler {
043 void onResponse(JavaScriptObject obj);
044
045 void onTimeout();
046
047 void onError(int errorCode, String errorMessage);
048 }
049
050 public static void requestJson(String url, JSONHandler handler) {
051 if (!url.endsWith("&") && !url.endsWith("?")) {
052 url += "&";
053 }
054 if (!url.contains("format=json")) {
055 url += "format=json&";
056 }
057 if (!url.contains("callback=")) {
058 //IMPORTANT : the url should ended with ?callback= or &callback= for JSONP calls
059 url += "callback=";
060 }
061 makeJSONRequest(requestId++, URL.encode(url), handler);
062 }
063
064 public static native void makeJSONRequest(int requestId, String url, JSONHandler handler) /*-{
065 var callback = "callback" + requestId;
066
067 // create SCRIPT tag, and set SRC attribute equal to JSON feed URL + callback function name
068 var script = document.createElement("script");
069 script.setAttribute("src", url+callback);
070 script.setAttribute("type", "text/javascript");
071
072 window[callback] = function(jsonObj) {
073 @org.sonar.api.web.gwt.client.webservices.JsonUtils::dispatchJSON(Lcom/google/gwt/core/client/JavaScriptObject;Lorg/sonar/api/web/gwt/client/webservices/JsonUtils$JSONHandler;)(jsonObj, handler);
074 window[callback + "done"] = true;
075 }
076
077 setTimeout(function() {
078 if (!window[callback + "done"]) {
079 handler.@org.sonar.api.web.gwt.client.webservices.JsonUtils.JSONHandler::onTimeout();
080 }
081
082 // cleanup
083 document.body.removeChild(script);
084 if (window[callback]) {
085 delete window[callback];
086 }
087 if (window[callback + "done"]) {
088 delete window[callback + "done"];
089 }
090 }, 120000);
091
092 document.body.appendChild(script);
093 }-*/;
094
095 public static void dispatchJSON(JavaScriptObject jsonObj, JSONHandler handler) {
096 JSONObject obj = new JSONObject(jsonObj);
097 if (obj.isObject() != null) {
098 if (obj.containsKey("err_code")) {
099 handler.onError(new Double(obj.get("err_code").isNumber().doubleValue()).intValue(),
100 obj.get("err_msg").isString().stringValue());
101 return;
102 }
103 }
104 handler.onResponse(jsonObj);
105 }
106
107 public static String getString(JSONObject json, String field) {
108 JSONValue jsonValue;
109 JSONString jsonString;
110 if ((jsonValue = json.get(field)) == null) {
111 return null;
112 }
113 if ((jsonString = jsonValue.isString()) == null) {
114 JSONNumber jsonNumber = jsonValue.isNumber();
115 return jsonNumber != null ? jsonNumber.toString() : null;
116 }
117 return jsonString.stringValue();
118 }
119
120 public static Date getDate(JSONObject json, String field) {
121 DateTimeFormat frmt = DateTimeFormat.getFormat("yyyy-MM-dd'T'HH:mm:ssZ");
122 String date = getString(json, field);
123 if (date!=null && date.endsWith("Z") && date.length()>2) {
124 // see SONAR-1182
125 date = date.substring(0, date.length()-2) + "+00:00";
126 }
127 return frmt.parse(date);
128 }
129
130 public static Boolean getBoolean(JSONObject json, String field) {
131 JSONValue jsonValue;
132 JSONBoolean jsonBoolean;
133 if ((jsonValue = json.get(field)) == null) {
134 return null;
135 }
136 if ((jsonBoolean = jsonValue.isBoolean()) == null) {
137 return null;
138 }
139 return jsonBoolean.booleanValue();
140 }
141
142 public static Double getDouble(JSONObject json, String field) {
143 JSONValue jsonValue;
144 JSONNumber jsonNumber;
145 if ((jsonValue = json.get(field)) == null) {
146 return null;
147 }
148 if ((jsonNumber = jsonValue.isNumber()) == null) {
149 return null;
150 }
151 return jsonNumber.doubleValue();
152 }
153
154 public static Integer getInteger(JSONObject json, String field) {
155 final Double d = getDouble(json, field);
156 if (d != null) {
157 return d.intValue();
158 }
159 return null;
160 }
161
162 public static JSONObject getArray(JSONValue json, int i) {
163 if (json instanceof JSONArray) {
164 return ((JSONArray) json).get(i).isObject();
165 }
166 if (json instanceof JSONObject) {
167 return ((JSONObject) json).get(Integer.toString(i)).isObject();
168 }
169 throw new JavaScriptException("Not implemented");
170 }
171
172 public static int getArraySize(JSONValue array) {
173 if (array instanceof JSONArray) {
174 return ((JSONArray) array).size();
175 }
176 if (array instanceof JSONObject) {
177 return ((JSONObject) array).size();
178 }
179 throw new JavaScriptException("Not implemented");
180 }
181
182 }