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