private CountMinSketchSpecForge ValidateSpecification(ExprValidationContext exprValidationContext)
{
// default specification
CountMinSketchSpecHashes hashes = new CountMinSketchSpecHashes(DEFAULT_EPS_OF_TOTAL_COUNT, DEFAULT_CONFIDENCE, DEFAULT_SEED);
CountMinSketchSpecForge spec = new CountMinSketchSpecForge(hashes, null, DEFAULT_AGENT);
// no parameters
if (this.ChildNodes.Length == 0)
{
return(spec);
}
// check expected parameter type: a json object
if (this.ChildNodes.Length > 1 || !(this.ChildNodes[0] is ExprConstantNode))
{
throw GetDeclaredWrongParameterExpr();
}
ExprConstantNode constantNode = (ExprConstantNode)this.ChildNodes[0];
object value = constantNode.ConstantValue;
if (!(value is IDictionary <string, object>))
{
throw GetDeclaredWrongParameterExpr();
}
// define what to populate
PopulateFieldWValueDescriptor[] descriptors = new PopulateFieldWValueDescriptor[] {
new PopulateFieldWValueDescriptor(
NAME_EPS_OF_TOTAL_COUNT,
typeof(double?),
spec.HashesSpec.GetType(),
value => {
if (value != null)
{
spec.HashesSpec.EpsOfTotalCount = value.AsDouble();
}
},
true),
new PopulateFieldWValueDescriptor(
NAME_CONFIDENCE,
typeof(double?),
spec.HashesSpec.GetType(),
value => {
if (value != null)
{
spec.HashesSpec.Confidence = value.AsDouble();
}
},
true),
new PopulateFieldWValueDescriptor(
NAME_SEED,
typeof(int?),
spec.HashesSpec.GetType(),
value => {
if (value != null)
{
spec.HashesSpec.Seed = value.AsInt32();
}
},
true),
new PopulateFieldWValueDescriptor(
NAME_TOPK,
typeof(int?),
spec.GetType(),
value => {
if (value != null)
{
spec.TopkSpec = (int?)value;
}
},
true),
new PopulateFieldWValueDescriptor(
NAME_AGENT,
typeof(string),
spec.GetType(),
value => {
if (value != null)
{
CountMinSketchAgentForge transform;
try {
var transformClass = exprValidationContext.ImportService.ResolveClass(
(string)value,
false,
ExtensionClassEmpty.INSTANCE);
transform = TypeHelper.Instantiate <CountMinSketchAgentForge>(transformClass);
}
catch (Exception e) {
throw new ExprValidationException("Failed to instantiate agent provider: " + e.Message, e);
}
spec.Agent = transform;
}
},
true),
};
// populate from json, validates incorrect names, coerces types, instantiates transform
PopulateUtil.PopulateSpecCheckParameters(descriptors, (IDictionary <string, object>)value, spec, ExprNodeOrigin.AGGPARAM, exprValidationContext);
return(spec);
}
private CountMinSketchSpec ValidateSpecification(ExprValidationContext exprValidationContext)
{
// default specification
var spec = new CountMinSketchSpec(new CountMinSketchSpecHashes(DEFAULT_EPS_OF_TOTAL_COUNT, DEFAULT_CONFIDENCE, DEFAULT_SEED), null, DEFAULT_AGENT);
// no parameters
if (ChildNodes.Count == 0)
{
return(spec);
}
// check expected parameter type: a json object
if (ChildNodes.Count > 1 || !(ChildNodes[0] is ExprConstantNode))
{
throw DeclaredWrongParameterExpr;
}
var constantNode = (ExprConstantNode)ChildNodes[0];
var value = constantNode.GetConstantValue(exprValidationContext.ExprEvaluatorContext);
if (!(value is IDictionary <string, object>))
{
throw DeclaredWrongParameterExpr;
}
// define what to populate
var descriptors = new PopulateFieldWValueDescriptor[] {
new PopulateFieldWValueDescriptor(NAME_EPS_OF_TOTAL_COUNT, typeof(double), spec.HashesSpec.GetType(), vv => {
if (vv != null)
{
spec.HashesSpec.EpsOfTotalCount = (double)vv;
}
}, true),
new PopulateFieldWValueDescriptor(NAME_CONFIDENCE, typeof(double), spec.HashesSpec.GetType(), vv => {
if (vv != null)
{
spec.HashesSpec.Confidence = (double)vv;
}
}, true),
new PopulateFieldWValueDescriptor(NAME_SEED, typeof(int), spec.HashesSpec.GetType(), vv => {
if (vv != null)
{
spec.HashesSpec.Seed = (int)vv;
}
}, true),
new PopulateFieldWValueDescriptor(NAME_TOPK, typeof(int), spec.GetType(), vv => {
if (vv != null)
{
spec.TopkSpec = (int)vv;
}
}, true),
new PopulateFieldWValueDescriptor(NAME_AGENT, typeof(string), spec.GetType(), vv => {
if (vv != null)
{
CountMinSketchAgent transform;
try {
var transformClass = exprValidationContext.EngineImportService.ResolveType((string)vv, false);
transform = TypeHelper.Instantiate <CountMinSketchAgent>(transformClass);
}
catch (Exception e) {
throw new ExprValidationException("Failed to instantiate agent provider: " + e.Message, e);
}
spec.Agent = transform;
}
}, true)
};
// populate from json, validates incorrect names, coerces types, instantiates transform
PopulateUtil.PopulateSpecCheckParameters(descriptors, (IDictionary <String, object>)value, spec, ExprNodeOrigin.AGGPARAM, exprValidationContext);
return(spec);
}
