private Expression CreateSearchExpression(ResourceElement coverage, ResourceElement patient)
{
var coverageValues = _searchIndexer.Extract(coverage);
var patientValues = _searchIndexer.Extract(patient);
var expressions = new List <Expression>();
var reverseChainExpressions = new List <Expression>();
expressions.Add(Expression.SearchParameter(_resourceTypeSearchParameter, Expression.StringEquals(FieldName.TokenCode, null, KnownResourceTypes.Patient, false)));
foreach (var patientValue in patientValues)
{
if (IgnoreInSearch(patientValue))
{
continue;
}
var modifier = string.Empty;
if (patientValue.SearchParameter.Type == ValueSets.SearchParamType.String)
{
modifier = ":exact";
}
expressions.Add(_expressionParser.Parse(new[] { KnownResourceTypes.Patient }, patientValue.SearchParameter.Code + modifier, patientValue.Value.ToString()));
}
foreach (var coverageValue in coverageValues)
{
if (IgnoreInSearch(coverageValue))
{
continue;
}
var modifier = string.Empty;
if (coverageValue.SearchParameter.Type == ValueSets.SearchParamType.String)
{
modifier = ":exact";
}
reverseChainExpressions.Add(_expressionParser.Parse(new[] { KnownResourceTypes.Coverage }, coverageValue.SearchParameter.Code + modifier, coverageValue.Value.ToString()));
}
if (reverseChainExpressions.Count != 0)
{
Expression reverseChainedExpression;
if (reverseChainExpressions.Count == 1)
{
reverseChainedExpression = reverseChainExpressions[0];
}
else
{
reverseChainedExpression = Expression.And(reverseChainExpressions);
}
var expression = Expression.Chained(new[] { KnownResourceTypes.Coverage }, _coverageBeneficiaryParameter, new[] { KnownResourceTypes.Patient }, true, reverseChainedExpression);
expressions.Add(expression);
}
return(Expression.And(expressions));
}
