internal SingleFilterInfo ParseFilter(string filterPart)
{
string[] filterStringParts;
SingleFilterInfo filterInfo = new SingleFilterInfo();
filterInfo.OperatorValue = DetermineFilterOperator(filterPart);
switch (filterInfo.OperatorValue)
{
case FilterOperator.GreaterThan:
filterStringParts = filterPart.Split(new string[] { ">" }, StringSplitOptions.RemoveEmptyEntries);
break;
case FilterOperator.LessThan:
filterStringParts = filterPart.Split(new string[] { "<" }, StringSplitOptions.RemoveEmptyEntries);
break;
case FilterOperator.EqualTo:
filterStringParts = filterPart.Split(new string[] { "=" }, StringSplitOptions.RemoveEmptyEntries);
break;
case FilterOperator.Like:
filterStringParts = filterPart.Split(new string[] { filterInfo.OperatorValue.ToString() }, StringSplitOptions.RemoveEmptyEntries);
break;
default:
throw new ArgumentOutOfRangeException("Filter Operator", "No operator was found. Valid operators are >[=], <[=], = and 'Like'.");
}
filterInfo.PropName = filterStringParts[0].Replace("[", "").Replace("]", "").Replace(" AND ", "").Trim();
// Get the property descriptor for the filter property name.
PropertyDescriptor filterPropDesc = TypeDescriptor.GetProperties(typeof(T))[filterInfo.PropName];
// Convert the filter compare value to the property type.
if (filterPropDesc == null)
{
throw new InvalidOperationException("Specified property to filter " + filterInfo.PropName + " on does not exist on type: " + typeof(T).Name);
}
filterInfo.PropDesc = filterPropDesc;
string comparePartNoQuotes = StripOffQuotes(filterStringParts[1]);
try
{
TypeConverter converter = TypeDescriptor.GetConverter(filterPropDesc.PropertyType);
filterInfo.CompareValue = converter.ConvertFromString(comparePartNoQuotes);
}
catch (NotSupportedException)
{
throw new InvalidOperationException("Specified filter value " + comparePartNoQuotes + " can not be converted" +
"from string. Implement a type converter for " + filterPropDesc.PropertyType.ToString());
}
return(filterInfo);
}
internal void ApplyFilter(SingleFilterInfo filterParts)
{
List <T> results;
// Check to see if the property type we are filtering by implements the IComparable interface.
Type interfaceType = TypeDescriptor.GetProperties(typeof(T))[filterParts.PropName].PropertyType.GetInterface("IComparable");
if (interfaceType == null)
{
throw new InvalidOperationException("Filtered property must implement IComparable.");
}
results = new List <T>();
// Check each value and add to the results list.
foreach (T item in this)
{
if (filterParts.PropDesc.GetValue(item) != null)
{
IComparable compareValue;
if (filterParts.PropName == "Employers")
{
// probably need to find the exact employer here. and then implement icomparabel on that particular employer
compareValue = (IComparable)filterParts.PropDesc.GetValue(item);
EmployersDefendant emps = (EmployersDefendant)filterParts.PropDesc.GetValue(item);
foreach (EmployerDefendant emp in emps)
{
if (string.IsNullOrEmpty(emp.SeparationDate))
{
if (emp.EmployerName.StartsWith(filterParts.CompareValue.ToString(), StringComparison.CurrentCultureIgnoreCase))
{
results.Add(item);
break;
}
}
}
}
else
{
compareValue = (IComparable)filterParts.PropDesc.GetValue(item);
// like operator works differently than the >, < and = operators, so handle it by itself.
if (filterParts.OperatorValue == FilterOperator.Like)
{
if (compareValue.ToString().StartsWith(filterParts.CompareValue.ToString(), StringComparison.CurrentCultureIgnoreCase))
{
results.Add(item);
}
}
else
{
int result = compareValue.CompareTo(filterParts.CompareValue);
if (filterParts.OperatorValue == FilterOperator.EqualTo && result == 0)
{
results.Add(item);
}
else if (filterParts.OperatorValue == FilterOperator.GreaterThan && result > 0)
{
results.Add(item);
}
else if (filterParts.OperatorValue == FilterOperator.LessThan && result < 0)
{
results.Add(item);
}
}
//if( compareValue.ToString().StartsWith( filterParts.CompareValue.ToString(), StringComparison.CurrentCultureIgnoreCase ) )
//{
// results.Add( item );
//}
}
}
}
// clearing the current list and adding the found results back in
this.ClearItems();
foreach (T itemFound in results)
{
this.Add(itemFound);
}
}
