public BlackboardConstraint() { m_firstValue = new MemoryVar(); m_secondValue = new MemoryVar(); m_valueType = ConditionValueType.Boolean; m_booleanComparison = BooleanComparison.IsTrue; m_numericComparison = NumericComparison.Equal; m_referenceComparison = ReferenceComparison.IsNotNull; }
public Expression <Func <TSourceType, bool> > NumericValueComparison <TSourceType>(string propertyName, NumericComparison comparison, double value) { var expTargetValue = Expression.Constant(value); var expParameter = Expression.Parameter(typeof(TSourceType), "x"); Expression expGetProperty = Expression.PropertyOrField(expParameter, propertyName); Expression body = null; switch (comparison) { case NumericComparison.Eq: body = Expression.Equal(expGetProperty, expTargetValue); break; case NumericComparison.Gt: body = Expression.GreaterThan(expGetProperty, expTargetValue); break; case NumericComparison.Gte: body = Expression.GreaterThanOrEqual(expGetProperty, expTargetValue); break; case NumericComparison.Lt: body = Expression.LessThan(expGetProperty, expTargetValue); break; case NumericComparison.Lte: body = Expression.LessThanOrEqual(expGetProperty, expTargetValue); break; } var lambda = Expression.Lambda <Func <TSourceType, bool> >(body, expParameter); return(lambda); }
/// <summary> /// Does a comparison with the given operator to a numeric FITS keyword value. /// </summary> /// <param name="fitsKeyword"></param> /// <param name="value"></param> /// <param name="comparison"></param> /// <returns></returns> public IFitsQueryExpression NumericValueComparison(string fitsKeyword, double value, NumericComparison comparison) { var exprParamType = typeof(FitsSearchResult); var headerType = typeof(FitsHeaderIndexedRow); var headerKeywordProps = headerType.GetProperties().Where(p => p.HasAttribute <FitsFieldAttribute>()); var matchingProp = headerKeywordProps.FirstOrDefault(p => p.GetCustomAttribute <FitsFieldAttribute>().Name == fitsKeyword); if (matchingProp == null) { throw new FitsDatabaseException($"Cannot add keyword matching for keyword '{fitsKeyword}' to the query, " + $"this keyword doesn't exist in the indexed keywords"); } if (matchingProp.PropertyType != typeof(double)) { throw new FitsDatabaseException($"Cannot add keyword matching for keyword '{fitsKeyword}' to the query, " + $"the given value is not of type '{matchingProp.PropertyType.Name}'"); } var targetValue = Expression.Constant(value); var parameter = Expression.Parameter(exprParamType, "x"); Expression property = Expression.PropertyOrField(parameter, nameof(FitsSearchResult.HeaderData)); property = Expression.PropertyOrField(property, matchingProp.Name); Expression body = null; switch (comparison) { case NumericComparison.Eq: body = Expression.Equal(property, targetValue); break; case NumericComparison.Gt: body = Expression.GreaterThan(property, targetValue); break; case NumericComparison.Gte: body = Expression.GreaterThanOrEqual(property, targetValue); break; case NumericComparison.Lt: body = Expression.LessThan(property, targetValue); break; case NumericComparison.Lte: body = Expression.LessThanOrEqual(property, targetValue); break; } var lambda = Expression.Lambda <Func <FitsSearchResult, bool> >(body, parameter); var expr = new FitsQueryExpression() { Expression = lambda }; return(expr); }