Java tutorial
/** * Copyright 2008-2015 Qualogy Solutions B.V. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.qualogy.qafe.gwt.client.util; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Set; import com.google.gwt.core.client.JavaScriptObject; import com.google.gwt.json.client.JSONArray; import com.google.gwt.json.client.JSONObject; import com.google.gwt.json.client.JSONValue; import com.qualogy.qafe.gwt.client.vo.handlers.EventHandler; public class JSNIUtil { public static final String ROOT_PANEL_PARAM = "rootpanel"; public static native String getString(String jsVar, String defaultValue)/*-{ var value = eval('$wnd.'+jsVar); if(value){ return value; } return defaultValue; }-*/; /** * Retrieve parameters in a script element defined as key1=value1,key2=value2 * * @param moduleName the name of the module to ge the params from * * @return the value of the paramName or an empty string **/ public static native String getScriptParameter(String moduleName, String paramName)/*-{ var search = "/" + moduleName + ".nocache.js"; var scripts = $doc.getElementsByTagName("script"); for (var i = 0; i < scripts.length; ++i) { if (scripts[i].src != null && scripts[i].src.indexOf(search) != -1 ) { // returns all formats that match key=value (note that spaces and dashes ("-") are not supported) var parameters = scripts[i].src.match(/\w+=\w+/g); if (parameters != null) { for (var j = 0; j < parameters.length; ++j) { var keyvalue = parameters[j].split("="); if (keyvalue.length == 2 && keyvalue[0] == paramName) { return unescape(keyvalue[1]); } } } } } return null; }-*/; public static native String evaluateExpression(String expression) /*-{ var expr = "resultValue=" + expression; result = eval($wnd.Sk.importMainWithBody("<stdin>", false, expr)); return String(result.$d.resultValue.v); }-*/; /** * Execute the given JavaScript function with the given parameters. * * @param functionName Name of an available JavaScript function. * @param params Parameters to be passed to the JavaScript function. * @return The result of the executed function. */ public static native String executeJavascript(String functionName, String params) /*-{ var result = eval("$wnd."+ functionName + "(" + params + ")"); return String(result); }-*/; /** * Assigns JavaScript functions, converted from Java functions by means of JSNI, * to JavaScript Window identifiers. */ public static native void exportQafeFunctions() /*-{ $wnd.invokeQafeEvent = @com.qualogy.qafe.gwt.client.util.JSNIUtil::invokeQafeEvent(*); }-*/; public static void invokeQafeEvent(String eventId, String windowId, String appId, JavaScriptObject javaScriptObject) { Map<String, Object> value = resolveJavaMap(javaScriptObject); EventHandler.getInstance().handleEvent(eventId, windowId, appId, value); } private static Map<String, Object> resolveJavaMap(JavaScriptObject jsValue) { Map<String, Object> value = new HashMap<String, Object>(); if (jsValue == null) { return value; } JSONObject jsonObject = new JSONObject(jsValue); if (jsonObject.isObject() == null) { return value; } value = resolveJavaMap(jsonObject); return value; } private static Map<String, Object> resolveJavaMap(JSONObject jsonObject) { if (jsonObject == null) { return null; } Map<String, Object> value = new HashMap<String, Object>(); Set<String> keys = jsonObject.keySet(); for (String key : keys) { JSONValue jsonValue = jsonObject.get(key); Object keyValue = resolveJavaValue(jsonValue); value.put(key, keyValue); } return value; } /** * Convert JavaScript objects to their Java representations. */ static Object resolveJavaValue(JSONValue jsonValue) { if (jsonValue == null) { return null; } Object value = null; if (jsonValue.isArray() != null) { value = resolveJavaList(jsonValue.isArray()); } else if (jsonValue.isObject() != null) { value = resolveJavaMap(jsonValue.isObject()); } else if (jsonValue.isBoolean() != null) { value = jsonValue.isBoolean().booleanValue(); } else if (jsonValue.isNumber() != null) { value = jsonValue.isNumber().doubleValue(); } else if (jsonValue.isString() != null) { value = jsonValue.isString().stringValue(); } return value; } private static List<Object> resolveJavaList(JSONArray jsonArray) { if (jsonArray == null) { return null; } List<Object> value = new ArrayList<Object>(); for (int i = 0; i < jsonArray.size(); i++) { JSONValue jsonValue = jsonArray.get(i); Object keyValue = resolveJavaValue(jsonValue); if (keyValue != null) { value.add(keyValue); } } return value; } }