int IEqualityComparer.GetHashCode(object obj)
{
RegExCacheIndex ri = (RegExCacheIndex)obj;
string pat = (ri.CaseSensitive ? "T:" : "F:") + ri.Pattern;
return(pat.GetHashCode());
}
private static Regex getCachedRegEx(string pattern, RegexOptions opt)
{
Context.CheckCancelled(); // Check if the user has cancelled
Boolean caseSensitive = (opt & RegexOptions.IgnoreCase) == RegexOptions.IgnoreCase;
RegExCacheIndex ri = new RegExCacheIndex(pattern, caseSensitive);
if (regExCache.ContainsKey(ri))
{
Context.TraceEvent(100, 0, "RegExFilter: Returning Cached RegEx");
Regex cachedRegEx;
lock (regExCache.SyncRoot)
{
cachedRegEx = (Regex)regExCache[ri];
}
return(cachedRegEx);
}
else
{
Context.TraceEvent(100, 0, "RegExFilter: Adding RegEx to Cache");
Regex newRegEx = new Regex(pattern, opt);
lock (regExCache.SyncRoot)
{
regExCache.Add(ri, newRegEx);
}
return(newRegEx);
}
}
bool IEqualityComparer.Equals(object x, object y)
{
RegExCacheIndex left = (RegExCacheIndex)x;
RegExCacheIndex right = (RegExCacheIndex)y;
if (left.CaseSensitive == right.CaseSensitive)
{
if (left.CaseSensitive == true)
{
return(string.Compare(left.Pattern, right.Pattern, false) == 0);
}
else
{
return(string.Compare(left.Pattern, right.Pattern, true) == 0);
}
}
else
{
return(false);
}
}
private static Regex getCachedRegEx(string pattern, RegexOptions opt)
{
Context.CheckCancelled(); // Check if the user has cancelled
Boolean caseSensitive = (opt & RegexOptions.IgnoreCase) == RegexOptions.IgnoreCase;
RegExCacheIndex ri = new RegExCacheIndex(pattern, caseSensitive);
if (regExCache.ContainsKey(ri))
{
Context.TraceEvent(100, 0, "RegExFilter: Returning Cached RegEx");
Regex cachedRegEx;
lock (regExCache.SyncRoot)
{
cachedRegEx = (Regex)regExCache[ri];
}
return cachedRegEx;
}
else
{
Context.TraceEvent(100, 0, "RegExFilter: Adding RegEx to Cache");
Regex newRegEx = new Regex(pattern, opt);
lock(regExCache.SyncRoot)
{
regExCache.Add(ri, newRegEx);
}
return newRegEx;
}
}
