/// <summary>
/// Sends a message to the Javascript side and waits for the response
/// </summary>
/// <param name="messageString">Message identification, or string.Empty to send to all subscribers</param>
/// <param name="argument">The argument to be send to the message subscriber</param>
/// <typeparam name="TResult">The type of the expected result</typeparam>
/// <typeparam name="TArgument">The type of the argument to send</typeparam>
/// <returns>Returns the response of the last subscriber</returns>
public virtual TResult Send <TResult, TArgument>(string messageString, TArgument argument)
{
var returnValue = HybridMessagingProxy.HandlerNewMessage(messageString, argument);
try
{
return(ClassBridge.NormalizeVariable <TResult>(returnValue));
}
catch (Exception)
{
return(default(TResult));
}
}
/// <summary>
/// Creates a new instance of this class
/// </summary>
/// <exception cref="InvalidGenericTypeException">Indicates that the passed generic type is not a valid class</exception>
public ClassBridge()
{
if (!GenericType.IsClass)
{
throw new InvalidGenericTypeException();
}
lock (Lock)
{
if (Methods == null)
{
Methods = GenericType.GetMethods()
.Where(
info =>
info.IsPublic && !info.IsGenericMethod)
.ToDictionary(info => info, info => info.GetParameters());
}
if (Constructors == null)
{
Constructors = GenericType.GetConstructors()
.Where(
info =>
info.IsPublic && !info.IsGenericMethod)
.ToDictionary(info => info, info => info.GetParameters());
}
if (Properties == null)
{
Properties =
GenericType.GetProperties()
.Where(
info =>
Methods.ContainsKey(info.GetGetMethod()) ||
Methods.ContainsKey(info.GetSetMethod()))
.ToList();
}
if (Fields == null)
{
Fields = GenericType.GetFields().Where(info => info.IsPublic).ToList();
}
if (Events == null)
{
Events =
GenericType.GetEvents()
.Where(
info =>
Methods.ContainsKey(info.GetAddMethod()) &&
Methods.ContainsKey(info.GetRemoveMethod()))
.ToList();
}
foreach (
var info in
Events.Where(info => info.GetAddMethod().IsStatic || info.GetRemoveMethod().IsStatic))
{
var eventInvokerReturn = info.EventHandlerType.GetMethod("Invoke").ReturnType;
if ((eventInvokerReturn == typeof(void)) || (eventInvokerReturn == typeof(object)))
{
var del = ClassBridge.CreateProxyDelegateForEvent(info, null, RaiseEvent);
StaticEventsDelegates.Add(info, del);
info.AddEventHandler(null, del);
}
else
{
var del = ClassBridge.CreateProxyDelegateForEvent(info, null,
(instance, eventName, isVoid, eventArgs) =>
ClassBridge.NormalizeVariable(RaiseEvent(instance, eventName, isVoid, eventArgs),
eventInvokerReturn, false));
StaticEventsDelegates.Add(info, del);
info.AddEventHandler(null, del);
}
}
if (SubEnumerations == null)
{
SubEnumerations =
GenericType.GetNestedTypes(BindingFlags.Public)
.Where(type => type.IsEnum)
.Select(EnumBridge.FromType)
.ToList();
foreach (var subEnum in SubEnumerations)
{
subEnum.PushJavascript += (sender, args) => OnPushJavascript(args);
}
}
if (SubClasses == null)
{
SubClasses =
GenericType.GetNestedTypes(BindingFlags.Public)
.Where(type => type.IsClass && !typeof(Delegate).IsAssignableFrom(type))
.Select(ClassBridge.FromType)
.ToList();
foreach (var subClasses in SubClasses)
{
subClasses.PushJavascript += (sender, args) => OnPushJavascript(args);
}
}
}
}
/// <summary>
/// Registers an instance of the generic type and adds it to the list of registered instances
/// </summary>
/// <param name="instance">The instance of the generic type to ad</param>
/// <param name="variableName">The name of the variable that is accessible from the Javascript side</param>
/// <returns>Returns <see langword="this" /> instance to be used for other operations</returns>
public virtual ClassBridge <T> AddInstance(T instance, string variableName)
{
if (instance != null)
{
if (!Instances.ContainsKey(instance))
{
Instances.Add(instance, new List <string>());
if (!InstancesEventsDelegates.ContainsKey(instance))
{
InstancesEventsDelegates.Add(instance, new Dictionary <EventInfo, Delegate>());
}
foreach (
var info in
Events.Where(info => !info.GetAddMethod().IsStatic&& !info.GetRemoveMethod().IsStatic))
{
var eventDelegate =
InstancesEventsDelegates[instance].FirstOrDefault(pair => pair.Key == info).Value;
if (eventDelegate == null)
{
var eventInvokerReturn = info.EventHandlerType.GetMethod("Invoke").ReturnType;
if ((eventInvokerReturn == typeof(void)) || (eventInvokerReturn == typeof(object)))
{
eventDelegate = ClassBridge.CreateProxyDelegateForEvent(info, instance, RaiseEvent);
}
else
{
eventDelegate = ClassBridge.CreateProxyDelegateForEvent(info, instance,
(o, s, arg3, arg4) =>
ClassBridge.NormalizeVariable(RaiseEvent(o, s, arg3, arg4), eventInvokerReturn,
false));
}
InstancesEventsDelegates[instance].Add(info, eventDelegate);
}
info.AddEventHandler(instance, eventDelegate);
}
OnPushJavascript(
new FireJavascriptEventArgs(ClassBridge.GenerateInstanceChange(Identification,
GlobalPool.GetInstanceId(instance), false)));
}
}
if (!string.IsNullOrWhiteSpace(variableName))
{
foreach (
var key in
Instances.Keys.Where(key => key != instance)
.Where(key => Instances[key].Contains(variableName))
.ToArray())
{
RemoveInstance(variableName, key as T);
}
if (instance != null)
{
if (!Instances[instance].Contains(variableName))
{
Instances[instance].Add(variableName);
OnPushJavascript(
new FireJavascriptEventArgs(ClassBridge.GenerateInstanceVariable(Identification,
GlobalPool.GetInstanceId(instance), variableName)));
}
}
else
{
OnPushJavascript(
new FireJavascriptEventArgs(ClassBridge.GenerateInstanceVariable(Identification, null,
variableName)));
}
}
return(this);
}
/// <summary>
/// Handles the passed request and returns the result
/// </summary>
/// <param name="method">The method name to handle</param>
/// <param name="parameters">The method parameters</param>
/// <param name="hasResult">A boolean value indicting if the handling process resulted in a value</param>
/// <returns>Returns the value that created from the handling of the request</returns>
public virtual object InterceptRequest(string method, Dictionary <string, object> parameters, out bool hasResult)
{
hasResult = false;
MethodInfo methodInfo = null;
ConstructorInfo constructorInfo = null;
var methodParameters = new object[0];
FieldInfo fieldInfo = null;
object fieldValue = null;
object classInstance = null;
var methodParts = method.Split('/');
if (methodParts.Length > 1)
{
method = string.Join("/", methodParts, 1, methodParts.Length - 1);
classInstance =
Instances.FirstOrDefault(
instance => GlobalPool.GetInstanceId(instance.Key) == methodParts[0]).Key;
}
lock (Lock)
{
if (string.IsNullOrWhiteSpace(method))
{
if ((Constructors != null) && parameters.ContainsKey("arguments"))
{
var constructorParameters = parameters["arguments"] as JArray;
foreach (var pair in Constructors)
{
var matchedArguments = 0;
try
{
var param = new List <object>();
for (var i = 0; i < pair.Value.Length; i++)
{
if ((constructorParameters != null) && (i < constructorParameters.Count))
{
param.Add(ClassBridge.NormalizeVariable(constructorParameters.ToArray()[i],
pair.Value[i].ParameterType, true));
matchedArguments++;
}
else
{
if (pair.Value[i].IsOptional)
{
param.Add(pair.Value[i].DefaultValue);
}
else
{
break;
}
}
}
if ((param.Count != pair.Value.Length) ||
(matchedArguments != (constructorParameters?.Count ?? 0)))
{
continue;
}
methodParameters = param.ToArray();
}
catch (InvalidCastException)
{
// ignore
}
constructorInfo = pair.Key;
}
}
}
else
{
if (Methods != null)
{
foreach (var pair in Methods.Where(pair => pair.Key.Name.Equals(method)))
{
var matchedArguments = 0;
try
{
var param = new List <object>();
for (var i = 0; i < pair.Value.Length; i++)
{
if (i < parameters.Count)
{
if (pair.Value[i].Name == parameters.Keys.ToArray()[i])
{
param.Add(ClassBridge.NormalizeVariable(parameters.Values.ToArray()[i],
pair.Value[i].ParameterType, true));
matchedArguments++;
}
else
{
break;
}
}
else
{
if (pair.Value[i].IsOptional)
{
param.Add(pair.Value[i].DefaultValue);
}
else
{
break;
}
}
}
if ((param.Count != pair.Value.Length) || (matchedArguments != parameters.Count))
{
continue;
}
methodParameters = param.ToArray();
}
catch (InvalidCastException)
{
// ignore
}
methodInfo = pair.Key;
}
}
if ((methodInfo == null) && (Fields != null))
{
foreach (
var field in
Fields.Where(info => info.Name.Equals(method, StringComparison.OrdinalIgnoreCase)))
{
if (parameters.Keys.Contains("value"))
{
try
{
fieldValue = ClassBridge.NormalizeVariable(parameters["value"], field.FieldType,
true);
}
catch (InvalidCastException)
{
// ignore
}
}
fieldInfo = field;
}
}
}
}
if (constructorInfo != null)
{
var newObject = constructorInfo.Invoke(methodParameters) as T;
if (newObject != null)
{
AddInstance(newObject);
var instanceId = GlobalPool.GetInstanceId(newObject);
if (!string.IsNullOrWhiteSpace(instanceId))
{
hasResult = true;
return(instanceId);
}
}
return(null);
}
if (methodInfo != null)
{
if (methodInfo.ReturnType != typeof(void))
{
hasResult = true;
return(methodInfo.Invoke(classInstance, methodParameters.ToArray()));
}
// Let's not block the UI/Javascript thread if there is no result for the requested method
Task.Factory.StartNew(() => methodInfo.Invoke(classInstance, methodParameters.ToArray()));
return(null);
}
if (fieldInfo != null)
{
if (fieldValue != null)
{
fieldInfo.SetValue(classInstance, fieldValue);
return(null);
}
hasResult = true;
return(fieldInfo.GetValue(classInstance));
}
return(null);
}
/// <summary>
/// The method to be called when a new message received from the Javascript side
/// </summary>
/// <param name="messageString">The message identification string, or string.Empty to match all</param>
/// <param name="arguments">The message arguments, or null</param>
/// <returns>Returns the response of the last subscriber</returns>
protected virtual object OnNewMessage(string messageString, object arguments)
{
messageString = messageString.ToLower().Trim();
object result = null;
Delegate[] delegates;
lock (Lock)
{
delegates =
Subscriptions.Where(
pair =>
string.IsNullOrEmpty(messageString) || string.IsNullOrEmpty(pair.Key) ||
messageString.Equals(pair.Key, StringComparison.CurrentCulture))
.SelectMany(pair => pair.Value)
.ToArray();
}
foreach (var subscription in delegates)
{
var methodInfo = subscription.Method;
var methodArguments = new List <object>();
var methodResultType = methodInfo.ReturnType;
try
{
var methodParameters = methodInfo.GetParameters();
var failed = false;
if (methodParameters.Length > 0)
{
foreach (var methodParameter in methodParameters)
{
if (methodArguments.Count == 0 && !(methodParameter.IsOptional && arguments == null))
{
methodArguments.Add(arguments == null
? null
: ClassBridge.NormalizeVariable(arguments, methodParameter.ParameterType, true));
}
else if (methodParameter.IsOptional)
{
methodArguments.Add(methodParameter.DefaultValue);
}
else
{
failed = true;
break;
}
}
if (failed)
{
continue;
}
}
}
catch (Exception)
{
continue;
}
if (methodInfo == null)
{
continue;
}
if (methodResultType == typeof(void))
{
// If we don't need the result of this method, we better run it in a new thread, so the UI thread don't get blocked
Task.Factory.StartNew(() => methodInfo.Invoke(subscription.Target, methodArguments.ToArray()));
}
else
{
var methodResult = methodInfo.Invoke(subscription.Target, methodArguments.ToArray());
result = methodResult == null
? null
: ClassBridge.NormalizeVariable(methodResult, methodResultType, true);
}
}
return(result);
}
