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+/* 
+ * Copyright 2011 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.ui;
+
+import com.vaadin.shared.ui.JavaScriptComponentState;
+import com.vaadin.terminal.JavaScriptCallbackHelper;
+
+/**
+ * Base class for Components with all client-side logic implemented using
+ * JavaScript.
+ * <p>
+ * When a new JavaScript component is initialized in the browser, the framework
+ * will look for a globally defined JavaScript function that will initialize the
+ * component. The name of the initialization function is formed by replacing .
+ * with _ in the name of the server-side class. If no such function is defined,
+ * each super class is used in turn until a match is found. The framework will
+ * thus first attempt with <code>com_example_MyComponent</code> for the
+ * server-side
+ * <code>com.example.MyComponent extends AbstractJavaScriptComponent</code>
+ * class. If MyComponent instead extends <code>com.example.SuperComponent</code>
+ * , then <code>com_example_SuperComponent</code> will also be attempted if
+ * <code>com_example_MyComponent</code> has not been defined.
+ * <p>
+ * JavaScript components have a very simple GWT widget ({@link JavaScriptWidget}
+ * ) just consisting of a <code>div</code> element to which the JavaScript code
+ * should initialize its own user interface.
+ * <p>
+ * The initialization function will be called with <code>this</code> pointing to
+ * a connector wrapper object providing integration to Vaadin with the following
+ * functions:
+ * <ul>
+ * <li><code>getConnectorId()</code> - returns a string with the id of the
+ * connector.</li>
+ * <li><code>getParentId([connectorId])</code> - returns a string with the id of
+ * the connector's parent. If <code>connectorId</code> is provided, the id of
+ * the parent of the corresponding connector with the passed id is returned
+ * instead.</li>
+ * <li><code>getElement([connectorId])</code> - returns the DOM Element that is
+ * the root of a connector's widget. <code>null</code> is returned if the
+ * connector can not be found or if the connector doesn't have a widget. If
+ * <code>connectorId</code> is not provided, the connector id of the current
+ * connector will be used.</li>
+ * <li><code>getState()</code> - returns an object corresponding to the shared
+ * state defined on the server. The scheme for conversion between Java and
+ * JavaScript types is described bellow.</li>
+ * <li><code>registerRpc([name, ] rpcObject)</code> - registers the
+ * <code>rpcObject</code> as a RPC handler. <code>rpcObject</code> should be an
+ * object with field containing functions for all eligible RPC functions. If
+ * <code>name</code> is provided, the RPC handler will only used for RPC calls
+ * for the RPC interface with the same fully qualified Java name. If no
+ * <code>name</code> is provided, the RPC handler will be used for all incoming
+ * RPC invocations where the RPC method name is defined as a function field in
+ * the handler. The scheme for conversion between Java types in the RPC
+ * interface definition and the JavaScript values passed as arguments to the
+ * handler functions is described bellow.</li>
+ * <li><code>getRpcProxy([name])</code> - returns an RPC proxy object. If
+ * <code>name</code> is provided, the proxy object will contain functions for
+ * all methods in the RPC interface with the same fully qualified name, provided
+ * a RPC handler has been registered by the server-side code. If no
+ * <code>name</code> is provided, the returned RPC proxy object will contain
+ * functions for all methods in all RPC interfaces registered for the connector
+ * on the server. If the same method name is present in multiple registered RPC
+ * interfaces, the corresponding function in the RPC proxy object will throw an
+ * exception when called. The scheme for conversion between Java types in the
+ * RPC interface and the JavaScript values that should be passed to the
+ * functions is described bellow.</li>
+ * <li><code>translateVaadinUri(uri)</code> - Translates a Vaadin URI to a URL
+ * that can be used in the browser. This is just way of accessing
+ * {@link ApplicationConnection#translateVaadinUri(String)}</li>
+ * </ul>
+ * The connector wrapper also supports these special functions:
+ * <ul>
+ * <li><code>onStateChange</code> - If the JavaScript code assigns a function to
+ * the field, that function is called whenever the contents of the shared state
+ * is changed.</li>
+ * <li>Any field name corresponding to a call to
+ * {@link #addFunction(String, JavaScriptFunction)} on the server will
+ * automatically be present as a function that triggers the registered function
+ * on the server.</li>
+ * <li>Any field name referred to using
+ * {@link #callFunction(String, Object...)} on the server will be called if a
+ * function has been assigned to the field.</li>
+ * </ul>
+ * <p>
+ * 
+ * Values in the Shared State and in RPC calls are converted between Java and
+ * JavaScript using the following conventions:
+ * <ul>
+ * <li>Primitive Java numbers (byte, char, int, long, float, double) and their
+ * boxed types (Byte, Character, Integer, Long, Float, Double) are represented
+ * by JavaScript numbers.</li>
+ * <li>The primitive Java boolean and the boxed Boolean are represented by
+ * JavaScript booleans.</li>
+ * <li>Java Strings are represented by JavaScript strings.</li>
+ * <li>List, Set and all arrays in Java are represented by JavaScript arrays.</li>
+ * <li>Map<String, ?> in Java is represented by JavaScript object with fields
+ * corresponding to the map keys.</li>
+ * <li>Any other Java Map is represented by a JavaScript array containing two
+ * arrays, the first contains the keys and the second contains the values in the
+ * same order.</li>
+ * <li>A Java Bean is represented by a JavaScript object with fields
+ * corresponding to the bean's properties.</li>
+ * <li>A Java Connector is represented by a JavaScript string containing the
+ * connector's id.</li>
+ * <li>A pluggable serialization mechanism is provided for types not described
+ * here. Please refer to the documentation for specific types for serialization
+ * information.</li>
+ * </ul>
+ * 
+ * @author Vaadin Ltd
+ * @since 7.0.0
+ */
+public abstract class AbstractJavaScriptComponent extends AbstractComponent {
+    private JavaScriptCallbackHelper callbackHelper = new JavaScriptCallbackHelper(
+            this);
+
+    @Override
+    protected <T> void registerRpc(T implementation, Class<T> rpcInterfaceType) {
+        super.registerRpc(implementation, rpcInterfaceType);
+        callbackHelper.registerRpc(rpcInterfaceType);
+    }
+
+    /**
+     * Register a {@link JavaScriptFunction} that can be called from the
+     * JavaScript using the provided name. A JavaScript function with the
+     * provided name will be added to the connector wrapper object (initially
+     * available as <code>this</code>). Calling that JavaScript function will
+     * cause the call method in the registered {@link JavaScriptFunction} to be
+     * invoked with the same arguments.
+     * 
+     * @param functionName
+     *            the name that should be used for client-side function
+     * @param function
+     *            the {@link JavaScriptFunction} object that will be invoked
+     *            when the JavaScript function is called
+     */
+    protected void addFunction(String functionName, JavaScriptFunction function) {
+        callbackHelper.registerCallback(functionName, function);
+    }
+
+    /**
+     * Invoke a named function that the connector JavaScript has added to the
+     * JavaScript connector wrapper object. The arguments should only contain
+     * data types that can be represented in JavaScript including primitives,
+     * their boxed types, arrays, String, List, Set, Map, Connector and
+     * JavaBeans.
+     * 
+     * @param name
+     *            the name of the function
+     * @param arguments
+     *            function arguments
+     */
+    protected void callFunction(String name, Object... arguments) {
+        callbackHelper.invokeCallback(name, arguments);
+    }
+
+    @Override
+    public JavaScriptComponentState getState() {
+        return (JavaScriptComponentState) super.getState();
+    }
+}