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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.terminal.gwt.client;
import java.util.ArrayList;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsArray;
import com.google.gwt.json.client.JSONArray;
import com.vaadin.terminal.gwt.client.communication.MethodInvocation;
public class JavaScriptConnectorHelper {
private final ServerConnector connector;
private final JavaScriptObject nativeState = JavaScriptObject
.createObject();
private final JavaScriptObject rpcMap = JavaScriptObject.createObject();
private JavaScriptObject connectorWrapper;
private int tag;
public JavaScriptConnectorHelper(ServerConnector connector) {
this.connector = connector;
}
public boolean init() {
ApplicationConfiguration conf = connector.getConnection()
.getConfiguration();
ArrayList<String> attemptedNames = new ArrayList<String>();
Integer tag = Integer.valueOf(this.tag);
while (tag != null) {
String serverSideClassName = conf.getServerSideClassNameForTag(tag);
String initFunctionName = serverSideClassName
.replaceAll("\\.", "_");
if (tryInitJs(initFunctionName, getConnectorWrapper())) {
VConsole.log("JavaScript connector initialized using "
+ initFunctionName);
return true;
} else {
VConsole.log("No JavaScript function " + initFunctionName
+ " found");
attemptedNames.add(initFunctionName);
tag = conf.getParentTag(tag.intValue());
}
}
VConsole.log("No JavaScript init for connector not found");
showInitProblem(attemptedNames);
return false;
}
protected void showInitProblem(ArrayList<String> attemptedNames) {
// Default does nothing
}
private static native boolean tryInitJs(String initFunctionName,
JavaScriptObject connectorWrapper)
/*-{
if (typeof $wnd[initFunctionName] == 'function') {
$wnd[initFunctionName].apply(connectorWrapper);
return true;
} else {
return false;
}
}-*/;
private JavaScriptObject getConnectorWrapper() {
if (connectorWrapper == null) {
connectorWrapper = createConnectorWrapper();
}
return connectorWrapper;
}
protected JavaScriptObject createConnectorWrapper() {
return createConnectorWrapper(this, nativeState, rpcMap,
connector.getConnectorId());
}
public void fireNativeStateChange() {
fireNativeStateChange(getConnectorWrapper());
}
private static native void fireNativeStateChange(
JavaScriptObject connectorWrapper)
/*-{
if (typeof connectorWrapper.onStateChange == 'function') {
connectorWrapper.onStateChange();
}
}-*/;
private static native JavaScriptObject createConnectorWrapper(
JavaScriptConnectorHelper h, JavaScriptObject nativeState,
JavaScriptObject registeredRpc, String connectorId)
/*-{
return {
'getConnectorId': function() {
return connectorId;
},
'getState': function() {
return nativeState;
},
'getRpcProxyFunction': function(iface, method) {
return $entry(function() {
h.@com.vaadin.terminal.gwt.client.JavaScriptConnectorHelper::fireRpc(Ljava/lang/String;Ljava/lang/String;Lcom/google/gwt/core/client/JsArray;)(iface, method, arguments);
});
},
'getCallback': function(name) {
return $entry(function() {
var args = [name, Array.prototype.slice.call(arguments, 0)];
var iface = "com.vaadin.ui.JavaScript$JavaScriptCallbackRpc";
var method = "call";
h.@com.vaadin.terminal.gwt.client.JavaScriptConnectorHelper::fireRpc(Ljava/lang/String;Ljava/lang/String;Lcom/google/gwt/core/client/JsArray;)(iface, method, args);
});
},
'registerCallback': function(name, callback) {
//TODO maintain separate map
if (!registeredRpc[name]) {
registeredRpc[name] = [];
}
registeredRpc[name].push(callback);
},
'registerRpc': function(iface, rpcHandler) {
if (!registeredRpc[iface]) {
registeredRpc[iface] = [];
}
registeredRpc[iface].push(rpcHandler);
},
};
}-*/;
private void fireRpc(String iface, String method,
JsArray<JavaScriptObject> arguments) {
JSONArray argumentsArray = new JSONArray(arguments);
Object[] parameters = new Object[arguments.length()];
for (int i = 0; i < parameters.length; i++) {
parameters[i] = argumentsArray.get(i);
}
connector.getConnection().addMethodInvocationToQueue(
new MethodInvocation(connector.getConnectorId(), iface, method,
parameters), true);
}
public void setNativeState(JavaScriptObject state) {
updateNativeState(nativeState, state);
}
private static native void updateNativeState(JavaScriptObject state,
JavaScriptObject input)
/*-{
// Copy all fields to existing state object
for(var key in state) {
if (state.hasOwnProperty(key)) {
delete state[key];
}
}
for(var key in input) {
if (input.hasOwnProperty(key)) {
state[key] = input[key];
}
}
}-*/;
public Object[] decodeRpcParameters(JSONArray parametersJson) {
return new Object[] { parametersJson.getJavaScriptObject() };
}
public void setTag(int tag) {
this.tag = tag;
}
public void invokeJsRpc(MethodInvocation invocation,
JSONArray parametersJson) {
if ("com.vaadin.ui.JavaScript$JavaScriptCallbackRpc".equals(invocation
.getInterfaceName())
&& "call".equals(invocation.getMethodName())) {
invokeJsRpc(rpcMap, parametersJson.get(0).isString().stringValue(),
null, parametersJson.get(1).isArray().getJavaScriptObject());
} else {
invokeJsRpc(rpcMap, invocation.getInterfaceName(),
invocation.getMethodName(),
parametersJson.getJavaScriptObject());
}
}
private static native void invokeJsRpc(JavaScriptObject rpcMap,
String interfaceName, String methodName, JavaScriptObject parameters)
/*-{
var targets = rpcMap[interfaceName];
if (!targets) {
return;
}
for(var i = 0; i < targets.length; i++) {
var target = targets[i];
if (methodName === null && typeof target === 'function') {
target.apply($wnd, parameters);
} else {
target[methodName].apply(target, parameters);
}
}
}-*/;
}
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