private EntityInfo RestoreOriginal(EntityInfo entityInfo)
{
// fk's can get cleared depending on the order in which deletions occur -
// EF needs the original values of these fk's under certain circumstances - ( not sure entirely what these are).
// so we restore the original fk values right before we attach the entity
// shouldn't be any side effects because we delete it immediately after.
// ??? Do concurrency values also need to be restored in some cases
// This method restores more than it actually needs to because we don't
// have metadata easily avail here, but usually a deleted entity will
// not have much in the way of OriginalValues.
if (entityInfo.OriginalValuesMap == null || entityInfo.OriginalValuesMap.Keys.Count == 0)
{
return(entityInfo);
}
var entity = entityInfo.Entity;
var entityType = entity.GetType();
//var efEntityType = GetEntityType(ObjectContext.MetadataWorkspace, entityType);
//var keyPropertyNames = efEntityType.KeyMembers.Select(km => km.Name).ToList();
var keyPropertyNames = GetKeyProperties(entityType).Select(kp => kp.Name).ToList();
var ovl = entityInfo.OriginalValuesMap.ToList();
for (var i = 0; i < ovl.Count; i++)
{
var kvp = ovl[i];
var propName = kvp.Key;
// keys should be ignored
if (keyPropertyNames.Contains(propName))
{
continue;
}
var pi = entityType.GetProperty(propName);
// unmapped properties should be ignored.
if (pi == null)
{
continue;
}
var nnPropType = TypeFns.GetNonNullableType(pi.PropertyType);
// presumption here is that only a predefined type could be a fk or concurrency property
if (TypeFns.IsPredefinedType(nnPropType))
{
SetPropertyValue(entity, propName, kvp.Value);
}
}
return(entityInfo);
}
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));
}
private bool CannotBeNull(Expression expr)
{
var t = expr.Type;
return(TypeFns.IsPredefinedType(t) && t != typeof(String));
}
// will return either a PropBlock or a LitBlock
public static BaseBlock CreateRHSBlock(object exprSource,
Type entityType, DataType otherExprDataType)
{
if (exprSource == null)
{
return(new LitBlock(exprSource, otherExprDataType));
}
if (exprSource is string)
{
var 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))
{
return(new PropBlock(source, entityType));
}
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());
}
var value = exprMap["value"];
if (exprMap.ContainsKey("isProperty"))
{
return(new PropBlock((string)value, entityType));
}
else
{
var dt = (string)exprMap["dataType"];
var 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());
}
