private void DisposeHelperObject()
{
if(helperObject != null) {
helperObject.Dispose();
helperObject = null;
}
}
/// <summary>
/// Checks if the file matches the conditions imposed by the filters
/// </summary>
/// <param name="file">The file to check.</param>
public bool AllowFile(string file)
{
// check the parameters
Debug.AssertNotNull(file, "File is null");
// allow all files if the Filter is disabled
if(_enabled == false) {
return true;
}
// use the expression tree to Filter the file
if(_expressionTree != null) {
return EvaluateTree(file);
}
// perform basic filtering
int count = filters.Count;
bool result = true;
helperObject = null;
for(int i = 0; i < count; i++) {
FilterBase filter = filters[i];
// skip disabled filters
if(filter.Enabled == false) {
continue;
}
filter.HelperObject = helperObject;
result &= filter.Allow(file);
helperObject = filter.HelperObject;
filter.HelperObject = null;
// return immediately if result is false
if(result == false) {
DisposeHelperObject();
return false;
}
}
// dispose the helper
DisposeHelperObject();
return result;
}
