public override void Validate(Type entityType)
{
if (Expr1Source == null)
{
throw new Exception("Unable to validate 1st expression: " + this.Expr1Source);
}
this._block1 = BaseBlock.CreateLHSBlock(Expr1Source, entityType);
if (_op == Operator.In && !(Expr2Source is IList))
{
throw new Exception("The 'in' operator requires that its right hand argument be an array");
}
// Special purpose Enum handling
var enumType = GetEnumType(this._block1);
if (enumType != null)
{
if (Expr2Source != null)
{
var et = TypeFns.GetNonNullableType(enumType);
var expr2Enum = Enum.Parse(et, (String)Expr2Source);
this._block2 = BaseBlock.CreateRHSBlock(expr2Enum, entityType, null);
}
else
{
this._block2 = BaseBlock.CreateRHSBlock(null, entityType, null);
}
}
else
{
this._block2 = BaseBlock.CreateRHSBlock(Expr2Source, entityType, this._block1.DataType);
}
}
public static DataType FromType(Type type)
{
var nnType = TypeFns.GetNonNullableType(type);
return(_typeMap[nnType]);
}
public override Expression ToExpression(Expression inExpr)
{
var exprs = _exprs.Select(e => e.ToExpression(inExpr)).ToList();
var expr = exprs[0];
// TODO: add the rest ...
if (FnName == "toupper")
{
var mi = TypeFns.GetMethodByExample((String s) => s.ToUpper());
return(Expression.Call(expr, mi));
}
else if (FnName == "tolower")
{
var mi = TypeFns.GetMethodByExample((String s) => s.ToLower());
return(Expression.Call(expr, mi));
}
else if (FnName == "trim")
{
var mi = TypeFns.GetMethodByExample((String s) => s.Trim());
return(Expression.Call(expr, mi));
}
else if (FnName == "length")
{
return(GetPropertyExpression(expr, "Length", typeof(int)));
}
else if (FnName == "indexof")
{
var mi = TypeFns.GetMethodByExample((String s) => s.IndexOf("xxx"));
return(Expression.Call(exprs[0], mi, exprs[1]));
}
else if (FnName == "concat")
{
// TODO: check if this works...
var mi = TypeFns.GetMethodByExample((String s) => String.Concat(s, "xxx"));
return(Expression.Call(mi, exprs[0], exprs[1]));
}
else if (FnName == "substring")
{
var mi = TypeFns.GetMethodByExample((String s) => s.Substring(1, 5));
return(Expression.Call(exprs[0], mi, exprs.Skip(1)));
}
else if (FnName == "replace")
{
// TODO: check if this works...
var mi = TypeFns.GetMethodByExample((String s) => s.Replace("aaa", "bbb"));
return(Expression.Call(exprs[0], mi, exprs[1], exprs[2]));
}
else if (FnName == "year")
{
return(GetPropertyExpression(expr, "Year", typeof(int)));
}
else if (FnName == "month")
{
return(GetPropertyExpression(expr, "Month", typeof(int)));
}
else if (FnName == "day")
{
return(GetPropertyExpression(expr, "Day", typeof(int)));
}
else if (FnName == "hour")
{
return(GetPropertyExpression(expr, "Hour", typeof(int)));
}
else if (FnName == "minute")
{
return(GetPropertyExpression(expr, "Minute", typeof(int)));
}
else if (FnName == "second")
{
return(GetPropertyExpression(expr, "Second", typeof(int)));
}
else if (FnName == "round")
{
// TODO: confirm that this works - is using static method.
var mi = TypeFns.GetMethodByExample((Double d) => Math.Round(d));
return(Expression.Call(mi, expr));
}
else if (FnName == "ceiling")
{
var mi = TypeFns.GetMethodByExample((Double d) => Math.Ceiling(d));
return(Expression.Call(mi, expr));
}
else if (FnName == "floor")
{
var mi = TypeFns.GetMethodByExample((Double d) => Math.Floor(d));
return(Expression.Call(mi, expr));
}
else if (FnName == "startswith")
{
var mi = TypeFns.GetMethodByExample((String s) => s.StartsWith("xxx"));
return(Expression.Call(exprs[0], mi, exprs[1]));
}
else if (FnName == "endsWith")
{
var mi = TypeFns.GetMethodByExample((String s) => s.EndsWith("xxx"));
return(Expression.Call(exprs[0], mi, exprs[1]));
}
else if (FnName == "substringof")
{
var mi = TypeFns.GetMethodByExample((String s) => s.Contains("xxx"));
return(Expression.Call(exprs[0], mi, exprs[1]));
}
else
{
throw new Exception("Unable to locate Fn: " + FnName);
}
}
private static BasePredicate PredicateFromKeyValue(String key, Object value)
{
Operator op = Operator.FromString(key);
if (op != null)
{
if (op.OpType == OperatorType.AndOr)
{
var preds2 = PredicatesFromObject(value);
return(new AndOrPredicate(op, preds2));
}
else if (op.OpType == OperatorType.Unary)
{
BasePredicate pred = PredicateFromObject(value);
return(new UnaryPredicate(op, pred));
}
else
{
throw new Exception("Invalid operator in context: " + key);
}
}
if (value == null || TypeFns.IsPredefinedType(value.GetType()))
{
return(new BinaryPredicate(BinaryOperator.Equals, key, value));
}
else if (value is IDictionary <string, object> && ((IDictionary <string, object>)value).ContainsKey("value"))
{
return(new BinaryPredicate(BinaryOperator.Equals, key, value));
}
if (!(value is Dictionary <string, object>))
{
throw new Exception("Unable to resolve value associated with key:" + key);
}
var preds = new List <BasePredicate>();
var map = (Dictionary <string, object>)value;
foreach (var subKey in map.Keys)
{
Operator subOp = Operator.FromString(subKey);
Object subVal = map[subKey];
BasePredicate pred;
if (subOp != null)
{
if (subOp.OpType == OperatorType.AnyAll)
{
BasePredicate subPred = PredicateFromObject(subVal);
pred = new AnyAllPredicate(subOp, key, subPred);
}
else if (subOp.OpType == OperatorType.Binary)
{
pred = new BinaryPredicate(subOp, key, subVal);
}
else
{
throw new Exception("Unable to resolve OperatorType for key: " + subKey);
}
// next line old check was for null not 'ContainsKey'
}
else if (subVal is IDictionary <string, object> && ((IDictionary <string, object>)subVal).ContainsKey("value"))
{
pred = new BinaryPredicate(BinaryOperator.Equals, key, subVal);
}
else
{
throw new Exception("Unable to resolve BasePredicate after: " + key);
}
preds.Add(pred);
}
return(CreateCompoundPredicate(preds));
}
// will return either a PropBlock or a LitBlock
#region Modified code - Added entityMetadataProvider parameter
public static BaseBlock CreateRHSBlock(Object exprSource,
Type entityType, DataType otherExprDataType, IEntityMetadataProvider entityMetadataProvider)
{
if (exprSource == null)
{
return(new LitBlock(exprSource, otherExprDataType));
}
if (exprSource is String)
{
String source = (String)exprSource;
if (entityType == null)
{
// if entityType is unknown then assume that the rhs is a
// literal
return(new LitBlock(source, otherExprDataType));
}
if (PropertySignature.IsProperty(entityType, source, entityMetadataProvider))
{
return(new PropBlock(source, entityType, entityMetadataProvider));
}
else
{
return(new LitBlock(source, otherExprDataType));
}
}
if (TypeFns.IsPredefinedType(exprSource.GetType()))
{
return(new LitBlock(exprSource, otherExprDataType));
}
if (exprSource is IDictionary <string, Object> )
{
var exprMap = (IDictionary <string, Object>)exprSource;
// note that this is NOT the same a using get and checking for null
// because null is a valid 'value'.
if (!exprMap.ContainsKey("value"))
{
throw new Exception(
"Unable to locate a 'value' property on: "
+ exprMap.ToString());
}
Object value = exprMap["value"];
if (exprMap.ContainsKey("isProperty"))
{
return(new PropBlock((String)value, entityType, entityMetadataProvider));
}
else
{
String dt = (String)exprMap["dataType"];
DataType dataType = (dt != null) ? DataType.FromName(dt) : otherExprDataType;
return(new LitBlock(value, dataType));
}
}
if (exprSource is IList)
{
// right now this pretty much implies the values on an 'in' clause
return(new LitBlock(exprSource, otherExprDataType));
}
if (TypeFns.IsEnumType(exprSource.GetType()))
{
return(new LitBlock(exprSource, otherExprDataType));
}
throw new Exception(
"Unable to parse the right hand side of this BinaryExpression: "
+ exprSource.ToString());
}
private Expression BuildBinaryExpr(Expression expr1, Expression expr2, Operator op)
{
if (expr1.Type != expr2.Type)
{
if (TypeFns.IsNullableType(expr1.Type) && !TypeFns.IsNullableType(expr2.Type))
{
if (!expr2.Type.IsEnum)
{
expr2 = Expression.Convert(expr2, expr1.Type);
}
else
{
expr1 = Expression.Convert(expr1, expr2.Type);
}
}
else if (TypeFns.IsNullableType(expr2.Type) && !TypeFns.IsNullableType(expr1.Type))
{
if (!expr1.Type.IsEnum)
{
expr1 = Expression.Convert(expr1, expr2.Type);
}
else
{
expr2 = Expression.Convert(expr2, expr1.Type);
}
}
if (HasNullValue(expr2) && CannotBeNull(expr1))
{
expr1 = Expression.Convert(expr1, TypeFns.GetNullableType(expr1.Type));
}
else if (HasNullValue(expr1) && CannotBeNull(expr2))
{
expr2 = Expression.Convert(expr2, TypeFns.GetNullableType(expr2.Type));
}
}
if (op == BinaryOperator.Equals)
{
return(Expression.Equal(expr1, expr2));
}
else if (op == BinaryOperator.NotEquals)
{
return(Expression.NotEqual(expr1, expr2));
}
else if (op == BinaryOperator.GreaterThan)
{
return(Expression.GreaterThan(expr1, expr2));
}
else if (op == BinaryOperator.GreaterThanOrEqual)
{
return(Expression.GreaterThanOrEqual(expr1, expr2));
}
else if (op == BinaryOperator.LessThan)
{
return(Expression.LessThan(expr1, expr2));
}
else if (op == BinaryOperator.LessThanOrEqual)
{
return(Expression.LessThanOrEqual(expr1, expr2));
}
else if (op == BinaryOperator.StartsWith)
{
var mi = TypeFns.GetMethodByExample((String s) => s.StartsWith("abc"));
return(Expression.Call(expr1, mi, expr2));
}
else if (op == BinaryOperator.EndsWith)
{
var mi = TypeFns.GetMethodByExample((String s) => s.EndsWith("abc"));
return(Expression.Call(expr1, mi, expr2));
}
else if (op == BinaryOperator.Contains)
{
var mi = TypeFns.GetMethodByExample((String s) => s.Contains("abc"));
return(Expression.Call(expr1, mi, expr2));
}
else if (op == BinaryOperator.In)
{
// TODO: need to generalize this past just 'string'
var mi = TypeFns.GetMethodByExample((List <String> list) => list.Contains("abc"), expr1.Type);
return(Expression.Call(expr2, mi, expr1));
}
return(null);
}
private bool CannotBeNull(Expression expr)
{
var t = expr.Type;
return(TypeFns.IsPredefinedType(t) && t != typeof(String));
}
/// <summary>
/// Constructs a generic list.
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
public static IList MakeGenericList(Type type)
{
return((IList)TypeFns.ConstructGenericInstance(typeof(List <>), type));
}