public virtual Filter GetFilter(XmlElement e)
{
UninterruptableMonitor.Enter(this);
try
{
XmlElement childElement = DOMUtils.GetFirstChildOrFail(e);
if (filterCache is null)
{
filterCache = new LurchTable <object, Filter>(LurchTableOrder.Access, cacheSize);
}
// Test to see if child Element is a query or filter that needs to be
// cached
IQueryBuilder qb = queryFactory.GetQueryBuilder(childElement.Name);
object cacheKey = null;
Query q = null;
Filter f = null;
if (qb != null)
{
q = qb.GetQuery(childElement);
cacheKey = q;
}
else
{
f = filterFactory.GetFilter(childElement);
cacheKey = f;
}
if (filterCache.TryGetValue(cacheKey, out Filter cachedFilter) && cachedFilter != null)
{
return(cachedFilter); // cache hit
}
//cache miss
if (qb != null)
{
cachedFilter = new QueryWrapperFilter(q);
}
else
{
cachedFilter = new CachingWrapperFilter(f);
}
filterCache[cacheKey] = cachedFilter;
return(cachedFilter);
}
finally
{
UninterruptableMonitor.Exit(this);
}
}
