private void ProcessChainedExpression(ChainedExpression chainedExpression, List <SearchParamTableExpression> tableExpressions, int chainLevel)
{
SearchParamTableExpressionQueryGenerator queryGenerator = chainedExpression.Expression.AcceptVisitor(_searchParamTableExpressionQueryGeneratorFactory, null);
Expression expressionOnTarget = queryGenerator == null ? chainedExpression.Expression : null;
var sqlChainLinkExpression = new SqlChainLinkExpression(
chainedExpression.ResourceTypes,
chainedExpression.ReferenceSearchParameter,
chainedExpression.TargetResourceTypes,
chainedExpression.Reversed,
expressionOnTarget: expressionOnTarget);
tableExpressions.Add(
new SearchParamTableExpression(
ChainLinkQueryGenerator.Instance,
sqlChainLinkExpression,
SearchParamTableExpressionKind.Chain,
chainLevel));
if (chainedExpression.Expression is ChainedExpression nestedChainedExpression)
{
ProcessChainedExpression(nestedChainedExpression, tableExpressions, chainLevel + 1);
}
else if (queryGenerator != null)
{
tableExpressions.Add(
new SearchParamTableExpression(
queryGenerator,
chainedExpression.Expression,
SearchParamTableExpressionKind.Normal,
chainLevel));
}
}
/// <summary>
/// Creates a new instance of the <see cref="SearchParamTableExpression"/> class.
/// </summary>
/// <param name="queryGenerator">The search parameter query generator</param>
/// <param name="predicate">The search expression over a columns belonging exclusively to a search parameter table.
/// Applies to the chain target if a chained expression.</param>
/// <param name="kind">The table expression kind.</param>
/// <param name="chainLevel">The nesting chain nesting level of the current expression. 0 if not a chain expression.</param>
public SearchParamTableExpression(
SearchParamTableExpressionQueryGenerator queryGenerator,
Expression predicate,
SearchParamTableExpressionKind kind,
int chainLevel = 0)
{
QueryGenerator = queryGenerator;
Predicate = predicate;
Kind = kind;
ChainLevel = chainLevel;
}