private Expression MakeSimpleCondition(FieldCondition fieldCondition)
{
PropertyInfo leftPropertyInfo = fieldCondition.LeftElementType.GetProperty(fieldCondition.LeftFieldName);
if (leftPropertyInfo == null)
{
throw new SpoltyException("Left field not found");
}
PropertyInfo rightPropertyInfo = fieldCondition.RightElementType.GetProperty(fieldCondition.RightFieldName);
if (rightPropertyInfo == null)
{
throw new SpoltyException("Right field not found");
}
ParameterExpression leftParam =
ExpressionHelper.CreateOrGetParameterExpression(fieldCondition.LeftElementType, fieldCondition.LeftElementType.Name, Factory.Store);
ParameterExpression rightParam =
ExpressionHelper.CreateOrGetParameterExpression(fieldCondition.RightElementType, fieldCondition.RightElementType.Name, Factory.Store);
Expression leftExpression =
ExpressionHelper.CreateMemberExpression(fieldCondition.LeftElementType, fieldCondition.LeftFieldName, leftParam);
Expression rightExpression =
ExpressionHelper.CreateMemberExpression(fieldCondition.RightElementType, fieldCondition.RightFieldName, rightParam);
rightExpression =
ExpressionHelper.ConvertOrCastInnerPropertyExpression(leftPropertyInfo.PropertyType, rightPropertyInfo, rightExpression);
Expression body = MakeComparisonExpression(leftExpression, rightExpression, fieldCondition.Operator);
return body;
}
private Expression MakeInnerJoin(Expression outerExpression, Expression innerExpression,
string[] leftFieldsNames, string[] rightFieldsNames,
ConditionList conditions)
{
Checker.CheckArgumentNull(outerExpression, "outerExpression");
Checker.CheckArgumentNull(innerExpression, "innerExpression");
Checker.CheckArgumentNull(leftFieldsNames, "leftFieldsNames");
Checker.CheckArgumentNull(outerExpression, "outerExpression");
int fieldsCount = leftFieldsNames.Length;
if (fieldsCount != rightFieldsNames.Length)
{
throw new SpoltyException("Number of fields mismatch");
}
Type outerType = ExpressionHelper.GetGenericType(outerExpression);
ParameterExpression outerParam = ExpressionHelper.CreateOrGetParameterExpression(outerType, outerType.Name, Factory.Store);
Type innerType = ExpressionHelper.GetGenericType(innerExpression);
ParameterExpression innerParam = ExpressionHelper.CreateOrGetParameterExpression(innerType, innerType.Name, Factory.Store);
var clw = new ConditionList();
for (int index = 1; index < fieldsCount; index++)
{
var fieldCondition =
new FieldCondition(leftFieldsNames[index],
ConditionOperator.EqualTo, rightFieldsNames[index], outerType, innerType);
clw.Add(fieldCondition);
}
PropertyInfo outerPropertyInfo = outerType.GetProperty(leftFieldsNames[0]);
if (outerPropertyInfo == null)
{
throw new SpoltyException("Property not found");
}
PropertyInfo innerPropertyInfo = innerType.GetProperty(rightFieldsNames[0]);
if (innerPropertyInfo == null)
{
throw new SpoltyException("Property not found");
}
Expression outerPropertyExpression = Expression.Property(outerParam, outerPropertyInfo);
Expression innerPropertyExpression = Expression.Property(innerParam, innerPropertyInfo);
Type type = outerPropertyInfo.PropertyType;
innerPropertyExpression =
ExpressionHelper.ConvertOrCastInnerPropertyExpression(type, innerPropertyInfo, innerPropertyExpression);
LambdaExpression outerKeySelector = Expression.Lambda(outerPropertyExpression, outerParam);
LambdaExpression innerKeySelector = Expression.Lambda(innerPropertyExpression, innerParam);
LambdaExpression resultSelector = Expression.Lambda(outerParam, outerParam, innerParam);
if (conditions != null && conditions.Count > 0)
{
clw.AddConditions(conditions);
}
Expression resultJoinExpression = CallJoinMethod(outerExpression, innerExpression, outerKeySelector,
innerKeySelector,
resultSelector);
resultJoinExpression = Factory.CreateConditionExpressionMaker().Make(clw, resultJoinExpression);
return resultJoinExpression;
}
