/// <summary>
/// Evaluates the expression using the given expression policy.
/// </summary>
/// <typeparam name="T">The expected result type.</typeparam>
/// <param name="policy">The expression policy.</param>
/// <param name="expression">The expression.</param>
/// <returns>The result of evaluating the expression with the given policy.</returns>
public static T Evaluate <T>(this IExpressionEvaluationPolicy policy, Expression expression)
{
if (policy == null)
{
throw new ArgumentNullException(nameof(policy));
}
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
var delegateCache = policy.DelegateCache;
if (delegateCache == null)
{
throw new ArgumentException("Expected non-null compiled delegate cache.", nameof(policy));
}
var constantHoister = policy.ConstantHoister;
if (constantHoister == null)
{
throw new ArgumentException("Expected non-null constant hoister.", nameof(policy));
}
var lambda = Expression.Lambda <Func <T> >(expression);
return(lambda.Compile(delegateCache, policy.OutlineCompilation, constantHoister)());
}
/// <summary>
/// Creates a new quoted representation of a subscribable sequence.
/// </summary>
/// <param name="value">Subscribable sequence to create a quote for.</param>
/// <param name="expression">Expression representing the subscribable sequence.</param>
/// <param name="policy">Policy used to evaluate the expression.</param>
public QuotedSubscribable(ISubscribable <T> value, Expression expression, IExpressionEvaluationPolicy policy)
: base(value, expression, policy)
{
//
// WARNING: This constructor gets called during quote instantiation.
//
}
/// <summary>
/// Creates a new quoted representation of a subscribable sequence.
/// </summary>
/// <param name="expression">Expression representing the subscribable sequence.</param>
/// <param name="policy">Policy used to evaluate the expression.</param>
public QuotedSubscribable(Expression expression, IExpressionEvaluationPolicy policy)
: base(expression, policy)
{
//
// WARNING: This constructor gets called during deserialization of persisted subscriptions.
//
}
/// <summary>
/// Creates a new quoted value using the specified expression tree.
/// </summary>
/// <param name="value">Value of the quote.</param>
/// <param name="expression">Expression representing the quoted value.</param>
/// <param name="policy">Policy used to evaluate the expression.</param>
public Quoted(T value, Expression expression, IExpressionEvaluationPolicy policy)
{
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
if (policy == null)
{
throw new ArgumentNullException(nameof(policy));
}
if (!typeof(T).IsAssignableFrom(expression.Type))
{
throw new ArgumentException("The specified expression does not have a type compatible with the specified value.", nameof(expression));
}
Value = value;
_expression = policy.InMemoryCache.Create(expression);
}
/// <summary>
/// Creates a new quoted value using the specified expression tree.
/// </summary>
/// <param name="expression">Expression representing the quoted value.</param>
/// <param name="policy">Policy used to evaluate the expression.</param>
public Quoted(Expression expression, IExpressionEvaluationPolicy policy)
: this(policy.Evaluate <T>(expression), expression, policy)
{
}
public QuoteConverter(IExpressionEvaluationPolicy expressionPolicy)
{
_expressionPolicy = expressionPolicy;
}
