private static string GetMaxValue(IFolderRange folderRange)
{
if (folderRange.IsMaxOpenEnded)
{
return("" + char.MaxValue + char.MaxValue + char.MaxValue);
}
return((string)folderRange.MaxValue);
}
private static string GetMinValue(IFolderRange folderRange)
{
if (folderRange.IsMinOpenEnded)
{
return("" + (char.MinValue + 1) + (char.MinValue + 1) + (char.MinValue + 1));
}
return((string)folderRange.MinValue);
}
private Expression CreateFolderRangeExpression(IFolderRange folderRange, Expression fieldExpression)
{
string minValue = GetMinValue(folderRange);
string maxValue = GetMaxValue(folderRange);
var fieldToUpper = Expression.Call(fieldExpression, this.StringToUpper_MethodInfo);
Expression expression = Expression.AndAlso(
Expression.NotEqual(
fieldExpression,
Expression.Constant(null, typeof(string))
),
Expression.AndAlso(
Expression.GreaterThanOrEqual(
Expression.Call(
this.StringCompare_MethodInfo,
fieldToUpper,
Expression.Constant(minValue.ToUpperInvariant())
),
Expression.Constant(0)
),
Expression.OrElse(
Expression.LessThanOrEqual(
Expression.Call(
this.StringCompare_MethodInfo,
fieldToUpper,
Expression.Constant(maxValue.ToUpperInvariant())
),
Expression.Constant(0)
),
Expression.Call(fieldToUpper, StringStartsWith_MethodInfo, Expression.Constant(maxValue.ToUpperInvariant()))
)
)
);
return(expression);
}
public override Expression CreateFilterExpression(int folderRangeIndex, Expression fieldExpression)
{
if (folderRangeIndex != -1)
{
IFolderRange folderRange = this.GetFolderRange(folderRangeIndex);
return(CreateFolderRangeExpression(folderRange, fieldExpression));
}
Expression currentExpression = null;
foreach (IFolderRange folderRange in this.Ranges.Where(f => f.Index != -1))
{
Expression expression = CreateFolderRangeExpression(folderRange, fieldExpression);
expression = Expression.Not(expression);
currentExpression = currentExpression.NestedAnd(expression);
}
return(currentExpression);
}
public void AddFolderRange(IFolderRange folderRange)
{
_folderRanges.Add(folderRange);
}
public void AddFolderRange(IFolderRange folderRange)
{
_folderRanges.Add(folderRange);
}
private Expression CreateFolderRangeExpression(IFolderRange folderRange, Expression fieldExpression)
{
string minValue = GetMinValue(folderRange);
string maxValue = GetMaxValue(folderRange);
var fieldToUpper = Expression.Call(fieldExpression, this.StringToUpper_MethodInfo);
Expression expression = Expression.AndAlso(
Expression.NotEqual(
fieldExpression,
Expression.Constant(null, typeof(string))
),
Expression.AndAlso(
Expression.GreaterThanOrEqual(
Expression.Call(
this.StringCompare_MethodInfo,
fieldToUpper,
Expression.Constant(minValue.ToUpperInvariant())
),
Expression.Constant(0)
),
Expression.OrElse(
Expression.LessThanOrEqual(
Expression.Call(
this.StringCompare_MethodInfo,
fieldToUpper,
Expression.Constant(maxValue.ToUpperInvariant())
),
Expression.Constant(0)
),
Expression.Call(fieldToUpper, StringStartsWith_MethodInfo, Expression.Constant(maxValue.ToUpperInvariant()))
)
)
);
return expression;
}
private static string GetMaxValue(IFolderRange folderRange)
{
if (folderRange.IsMaxOpenEnded)
{
return "" + char.MaxValue + char.MaxValue + char.MaxValue;
}
return (string) folderRange.MaxValue;
}
private static string GetMinValue(IFolderRange folderRange)
{
if (folderRange.IsMinOpenEnded)
{
return "" + (char.MinValue + 1) + (char.MinValue + 1) + (char.MinValue + 1);
}
return (string) folderRange.MinValue;
}
public override Expression CreateFilterExpression(int folderRangeIndex, Expression fieldExpression)
{
if (folderRangeIndex != -1)
{
IFolderRange folderRange = this.GetFolderRange(folderRangeIndex);
int minValue = (int)folderRange.MinValue;
int maxValue = (int)folderRange.MaxValue;
Expression minExpression = Expression.GreaterThanOrEqual(
fieldExpression,
Expression.Constant(minValue)
);
Expression maxExpression = Expression.LessThanOrEqual(
fieldExpression,
Expression.Constant(maxValue)
);
Expression expression;
if (folderRange.IsMinOpenEnded)
{
expression = maxExpression;
}
else if (folderRange.IsMaxOpenEnded)
{
expression = minExpression;
}
else
{
expression = Expression.And(minExpression, maxExpression);
}
return(expression);
}
else
{
Expression currentExpression = null;
foreach (IFolderRange folderRange in this.Ranges.Where(f => f.Index != -1))
{
int minValue = (int)folderRange.MinValue;
int maxValue = (int)folderRange.MaxValue;
Expression minExpression = Expression.GreaterThanOrEqual(
fieldExpression,
Expression.Constant(minValue)
);
Expression maxExpression = Expression.LessThanOrEqual(
fieldExpression,
Expression.Constant(maxValue)
);
if (folderRange.IsMinOpenEnded)
{
currentExpression = currentExpression.NestedAnd(Expression.Not(maxExpression));
}
else if (folderRange.IsMaxOpenEnded)
{
currentExpression = currentExpression.NestedAnd(Expression.Not(minExpression));
}
else
{
currentExpression = currentExpression.NestedAnd(
Expression.Not(
Expression.And(
minExpression,
maxExpression
)
)
);
}
}
return(currentExpression);
}
}
