/// <summary>
/// Gets the <see cref="IQuerySource" /> corresponding to the given <paramref name="node" />, throwing an
/// <see cref="InvalidOperationException" />
/// if no such clause has been registered in the given <paramref name="context" />.
/// </summary>
/// <param name="node">The node for which the <see cref="IQuerySource" /> should be returned.</param>
/// <param name="context">The clause generation context.</param>
/// <returns>The <see cref="IQuerySource" /> corresponding to <paramref name="node" />.</returns>
public static IQuerySource GetQuerySourceForNode(IQuerySourceExpressionNode node,
ClauseGenerationContext context)
{
try
{
return((IQuerySource)context.GetContextInfo(node));
}
catch (KeyNotFoundException ex)
{
var message = string.Format(
"Cannot retrieve an IQuerySource for the given {0}. Be sure to call Apply before calling methods that require IQuerySources, and pass in "
+ "the same QuerySourceClauseMapping to both.",
node.GetType().Name);
throw new InvalidOperationException(message, ex);
}
}