public static ExpressionDefinition TakeWhile()
{
Expression <Func <IObservable <string>, IObservable <string> > > expression
= (a) => a.TakeWhile(i => i.Length < 3);
return(ExpressionDefinition.Create(expression));
}
public static ExpressionInstance Create(ExpressionDefinition definition)
{
// input
var inputs = new ObservableCollection <ObservableInput>();
foreach (var pair in definition.SourceTypes)
{
var inputType = typeof(ObservableInput <>).MakeGenericType(pair.Value.GetGenericArguments()[0]);
var input = (ObservableInput)Activator.CreateInstance(inputType);
input.Name = pair.Key;
inputs.Add(input);
}
// create output
var outputObject = definition
.CompiledExpression
.DynamicInvoke(inputs
.OfType <IObservableInput>()
.Select(g => g.Observable)
.ToArray());
var outputType = typeof(ObservableOutput <>).MakeGenericType(
definition.CompiledExpression.Method.ReturnType.GetGenericArguments()[0]);
var output = (ObservableSource)Activator.CreateInstance(outputType, outputObject);
return(new ExpressionInstance
{
Definition = definition,
Inputs = new ReadOnlyObservableCollection <ObservableInput>(inputs),
Output = output,
}.SetUpDiagram());
}
public static ExpressionDefinition GroupBy()
{
string code =
@"
from s in a
group s by s.Length
into gr
from ss in gr
select ""Key: "" + gr.Key + "" Value: "" + ss;
";
Expression <Func <IObservable <string>, IObservable <string> > > expression = a =>
from s in a
group s by s.Length
into gr
from ss in gr
select "Key: " + gr.Key + " Value: " + ss;
var @operator = ReflectionHelper.GetMethod(
() => Observable.GroupBy <string, string>(null, _ => _));
return(ExpressionDefinition.Create(expression,
new ExpressionSettings {
Operator = @operator, CodeSample = code
}));
}
public static ExpressionDefinition SelectMany()
{
Expression <Func <IObservable <long>, IObservable <long> > > expression
= a => a.SelectMany(v => Observable.Interval(TimeSpan.FromMilliseconds(1000)).Select(_ => v).Take((int)v));
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition Skip()
{
Expression <Func <IObservable <string>, IObservable <string> > > expression
= (a) => a.Skip(4);
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition Scan()
{
Expression <Func <IObservable <string>,
IObservable <int> > > expression
= (a) => a.Scan(0, (acc, v) => acc + v.Length);
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition DistinctUntilChanged()
{
Expression <Func <IObservable <string>,
IObservable <string> > > expression
= (a) => a.DistinctUntilChanged();
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition Where()
{
Expression <Func <IObservable <string>,
IObservable <string> > > expression
= (a) => a.Where(i => i.Length % 2 == 0);
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition OnErrorResumeNext()
{
Expression <Func <IObservable <string>, IObservable <string>,
IObservable <string> > > expression
= (a, b) => a.OnErrorResumeNext(b);
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition Any()
{
Expression <Func <IObservable <string>,
IObservable <bool> > > expression
= a => a.Any(i => i.Length < 3);
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition Average()
{
Expression <Func <IObservable <double>,
IObservable <double> > > expression
= a => a.Average();
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition Min()
{
Expression <Func <IObservable <int>,
IObservable <int> > > expression
= a => a.Min();
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition Count()
{
Expression <Func <IObservable <string>,
IObservable <int> > > expression
= a => a.Count();
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition Merge()
{
Expression <Func <IObservable <string>, IObservable <string>, IObservable <string>,
IObservable <string> > > expression
= (a, b, c) => Observable.Merge(a, b, c);
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition Select()
{
Expression <Func <IObservable <string>,
IObservable <int> > > expression
= (a) => a.Select(i => i.Length);
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition CombineLatest()
{
Expression <Func <IObservable <string>, IObservable <string>,
IObservable <string> > > expression
= (a, b) => a.CombineLatest(b, (x, y) => x + " - " + y);
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition Sample()
{
Expression <Func <IObservable <string>,
IObservable <string> > > expression
= (a) => a.Sample(TimeSpan.FromSeconds(2));
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition TakeUntil()
{
Expression <Func <IObservable <string>, IObservable <string>,
IObservable <string> > > expression
= (a, b) => a.TakeUntil(b);
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition Repeat()
{
Expression <Func <IObservable <string>, IObservable <string> > > expression
= a => a
.SelectMany(v => string.IsNullOrEmpty(v) ? Observable.Throw <string>(new Exception()) : Observable.Return(v))
.Retry();
return(ExpressionDefinition.Create(expression));
}
public static ExpressionDefinition Merge()
{
Expression <Action> temp = () => Observable.Merge(new IObservable <string> [0]);
var @operator = (temp.Body as MethodCallExpression).Method;
Func <IObservable <string>, IObservable <string>, IObservable <string>,
IObservable <string> > expression
= (a, b, c) => Observable.Merge(a, b, c);
return(ExpressionDefinition.Create(expression, new ExpressionSettings
{
Operator = @operator
}));
}
public ExpressionInstanceVM()
{
Reset = new DelegateCommand <object>(ResetHandler);
Close = new DelegateCommand <object>(CloseHandler);
_inputs = new ObservableCollection <ObservableInputVM>();
Inputs = new ReadOnlyObservableCollection <ObservableInputVM>(_inputs);
if (IsInDesignMode())
{
Definition = new ExpressionDefinition("Zip", "To jest opis Zip ... ", "(a,b) => z.Zip(b, (x,y) => x + y)");
_inputs.Add(new ObservableInputVM());
Output = new ObservableOutputVM();
}
}
public static ExpressionDefinition BufferWithCount()
{
Expression <Func <IObservable <string>,
IObservable <string> > > expression
= a => a.Buffer(3).
Select(i => string.Join(",", i.ToArray()));
var @operator = ReflectionHelper.GetMethod(
() => Observable.Buffer <string>(null, 3));
return(ExpressionDefinition.Create(expression,
new ExpressionSettings {
Operator = @operator, Name = "BufferWithCount"
}));
}
public static ExpressionDefinition WindowWithTime()
{
Expression <Func <IObservable <string>,
IObservable <string> > > expression
= a => a.Window(TimeSpan.FromSeconds(3)).
Select(i => string.Join(",", i.ToArray()));
var @operator = ReflectionHelper.GetMethod(
() => Observable.Window <string>(null, TimeSpan.FromSeconds(3)));
return(ExpressionDefinition.Create(expression,
new ExpressionSettings {
Operator = @operator
}));
}
public static ExpressionDefinition IncrementalSearch()
{
Func <IObservable <string>, IObservable <Person>, IObservable <Person> > expression
= (codeChanged, webServiceCall) =>
{
var q =
from code in codeChanged
from x in Observable.Return(new Unit()).Delay(TimeSpan.FromSeconds(4)).TakeUntil(codeChanged)
from result in webServiceCall.TakeUntil(codeChanged)
select result;
return(q);
};
return(ExpressionDefinition.Create(expression, new ExpressionSettings
{
Name = "Incremental find",
Description = @"Send the code of the person you are looking for, "
+ "after four seconds (if you don't send new code again) web service "
+ "will be called. The result won't be returned if new code is provided "
+ "in the meantime.",
}));
}
public ExpressionInstanceVM(ExpressionDefinition definition)
: this()
{
Definition = definition;
Reset.Execute(null);
}
