/// <summary>
/// Create a query that combines the specified expression with an expression that compares the instance state with the specified states
/// </summary>
/// <param name="machine">The state machine</param>
/// <param name="expression">The query expression</param>
/// <param name="states">The states that are valid for this query</param>
/// <typeparam name="TInstance">The instance type</typeparam>
/// <returns></returns>
public static Func <TInstance, bool> CreateSagaFilter <TInstance>(this StateMachine <TInstance> machine, Expression <Func <TInstance, bool> > expression,
params State[] states)
where TInstance : class, ISaga
{
Expression <Func <TInstance, bool> > stateExpression = machine.Accessor.GetStateExpression(states);
return(StateExpressionVisitor <TInstance> .Combine(expression, stateExpression).CompileFast());
}
/// <summary>
/// Create a query that combines the specified expression with an expression that compares the instance state with the specified states
/// </summary>
/// <param name="machine">The state machine</param>
/// <param name="expression">The query expression</param>
/// <param name="states">The states that are valid for this query</param>
/// <typeparam name="TInstance">The instance type</typeparam>
/// <returns></returns>
public static ISagaQuery <TInstance> CreateSagaQuery <TInstance>(this StateMachine <TInstance> machine, Expression <Func <TInstance, bool> > expression,
params State[] states)
where TInstance : class, ISaga
{
Expression <Func <TInstance, bool> > stateExpression = machine.Accessor.GetStateExpression(states);
return(new SagaQuery <TInstance>(StateExpressionVisitor <TInstance> .Combine(expression, stateExpression)));
}