/// <summary>
/// Composes the <paramref name="previous"/> expression with this one when it's specified multiple times.
/// </summary>
/// <param name="previous"><see cref="QueryOptionExpression"/> to compose.</param>
/// <returns>
/// The expression that results from composing the <paramref name="previous"/> expression with this one.
/// </returns>
internal override QueryOptionExpression ComposeMultipleSpecification(QueryOptionExpression previous)
{
Debug.Assert(previous != null, "other != null");
Debug.Assert(previous.GetType() == this.GetType(), "other.GetType == this.GetType() -- otherwise it's not the same specification");
Debug.Assert(this.skipAmount != null, "this.skipAmount != null");
Debug.Assert(
this.skipAmount.Type == typeof(int),
"this.skipAmount.Type == typeof(int) -- otherwise it wouldn't have matched the Enumerable.Skip(source, int count) signature");
int thisValue = (int)this.skipAmount.Value;
int previousValue = (int)((SkipQueryOptionExpression)previous).skipAmount.Value;
return(new SkipQueryOptionExpression(this.Type, Expression.Constant(thisValue + previousValue, typeof(int))));
}
/// <summary>
/// Add query option to resource expression
/// </summary>
/// <param name="qoe">The query option expression.</param>
internal void AddSequenceQueryOption(QueryOptionExpression qoe)
{
Debug.Assert(qoe != null, "qoe != null");
QueryOptionExpression old = this.sequenceQueryOptions.Where(o => o.GetType() == qoe.GetType()).FirstOrDefault();
if (old != null)
{
qoe = qoe.ComposeMultipleSpecification(old);
this.sequenceQueryOptions.Remove(old);
}
this.sequenceQueryOptions.Add(qoe);
}
/// <summary>
/// Composes the <paramref name="previous"/> expression with this one when it's specified multiple times.
/// </summary>
/// <param name="previous"><see cref="QueryOptionExpression"/> to compose.</param>
/// <returns>
/// The expression that results from composing the <paramref name="previous"/> expression with this one.
/// </returns>
internal virtual QueryOptionExpression ComposeMultipleSpecification(QueryOptionExpression previous)
{
Debug.Assert(previous != null, "other != null");
Debug.Assert(previous.GetType() == this.GetType(), "other.GetType == this.GetType() -- otherwise it's not the same specification");
return(this);
}
