Java tutorial
/* * Copyright 2000-2018 Vaadin Ltd. * * 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.vaadin.client; import java.util.HashSet; import java.util.Set; import com.google.gwt.core.client.JavaScriptObject; import com.google.gwt.core.client.JsArray; import com.google.gwt.core.client.JsArrayString; public final class ValueMap extends JavaScriptObject { protected ValueMap() { } public native double getRawNumber(final String name) /*-{ return this[name]; }-*/; public native int getInt(final String name) /*-{ return this[name]; }-*/; public native boolean getBoolean(final String name) /*-{ return Boolean(this[name]); }-*/; public native String getString(String name) /*-{ return this[name]; }-*/; public native JsArrayString getKeyArray() /*-{ var a = new Array(); var attr = this; for (var j in attr) { // workaround for the infamous chrome hosted mode hack (__gwt_ObjectId) if (attr.hasOwnProperty(j)) a.push(j); } return a; }-*/; public Set<String> getKeySet() { final HashSet<String> attrs = new HashSet<>(); JsArrayString attributeNamesArray = getKeyArray(); for (int i = 0; i < attributeNamesArray.length(); i++) { attrs.add(attributeNamesArray.get(i)); } return attrs; } public native JsArrayString getJSStringArray(String name) /*-{ return this[name]; }-*/; public native JsArray<ValueMap> getJSValueMapArray(String name) /*-{ return this[name]; }-*/; public String[] getStringArray(final String name) { JsArrayString stringArrayAttribute = getJSStringArray(name); final String[] s = new String[stringArrayAttribute.length()]; for (int i = 0; i < stringArrayAttribute.length(); i++) { s[i] = stringArrayAttribute.get(i); } return s; } public int[] getIntArray(final String name) { JsArrayString stringArrayAttribute = getJSStringArray(name); final int[] s = new int[stringArrayAttribute.length()]; for (int i = 0; i < stringArrayAttribute.length(); i++) { s[i] = Integer.parseInt(stringArrayAttribute.get(i)); } return s; } public native boolean containsKey(final String name) /*-{ return name in this; }-*/; public native ValueMap getValueMap(String name) /*-{ return this[name]; }-*/; public native String getAsString(String name) /*-{ return '' + this[name]; }-*/; public native JavaScriptObject getJavaScriptObject(String name) /*-{ return this[name]; }-*/; }