public static string GetContext(Entry termEntry, string[] lexemes, out ArrayList hgltPairs)
{
string context = cNoContextSign;
int contextsNumber = Math.Min(MinimalNumberOfContexts, termEntry.Count);
int[] shifts = new int[termEntry.Count];
hgltPairs = new ArrayList();
Collector.Init(termEntry.Offsets, shifts);
try
{
// it is possible situation when temporary file is removed
// during this processing.
IResource res = Core.ResourceStore.TryLoadResource(termEntry.DocIndex);
if (res != null)
{
Core.PluginLoader.InvokeResourceTextProviders(res, Collector);
if (Collector.Body.Length > 0)
{
context = cFragmentsDelimiter;
int leftBorder = Int32.MaxValue, rightBorder = Int32.MinValue;
int prevContextLength = 0;
for (int i = 0; i < contextsNumber; i++)
{
InstanceOffset instance = termEntry.Instance(i);
int origOffset = instance.OffsetNormal;
int offset = Collector.ConvertOffset(origOffset, instance.SectionId);
ArrayList delimiterOffsets = new ArrayList();
// workaround of possible invalid text body reconstruction
// by plugin, when search terms appear out of the text margins...
if (offset < Collector.Body.Length)
{
if (offset < leftBorder || offset > rightBorder)
{
leftBorder = Math.Max(0, offset - cContextSideLength);
rightBorder = Math.Min(Collector.Body.Length - 1, offset + cContextSideLength);
TuneBorders(offset, Collector.Body, ref leftBorder, ref rightBorder);
string fragment = Collector.Body.Substring(leftBorder, rightBorder - leftBorder + 1);
InsertSectionDelimiters(ref fragment, leftBorder, rightBorder, context.Length, delimiterOffsets);
prevContextLength = context.Length;
context += fragment + cFragmentsDelimiter;
}
else
if (contextsNumber < termEntry.Count)
{
contextsNumber++;
}
int startOffset = offset - leftBorder + prevContextLength;
string lexeme = lexemes[instance.BaseID];
lexeme = ReconstructWordform(instance.Offset, lexeme, OMEnv.DictionaryServer);
TuneOffsetByBorders(ref startOffset, delimiterOffsets);
hgltPairs.Add(new OffsetData(startOffset, lexeme.Length));
}
}
context = context.Replace("\r\n", " ");
context = context.Replace("\n", " ");
context = context.Replace("\r", " ");
context = context.Replace("\t", " ");
Trace.WriteLine("ContextExtractor -- context for [" + termEntry.DocIndex + "/" + res.Type + "] is [" + context + "]");
foreach (OffsetData pair in hgltPairs)
{
if (pair.Start + pair.Length >= context.Length)
{
Trace.WriteLine(" highlight prefix of token [" + context.Substring(pair.Start) + "]");
}
else
{
Trace.WriteLine(" highlight token [" + context.Substring(pair.Start, pair.Length) + "]");
}
}
}
}
}
catch
{
// Here we catch exceptions described in the OM-10659, reason
// for which is still is not found. Just hide the bug.
}
return(context);
}