private int GetRecordHandle(int termId)
{
recordKey.SetIntKey(termId);
IEnumerator enumerator = TermId2RecordHandle.SearchForRange(recordKey, recordKey).GetEnumerator();
try
{
if (!enumerator.MoveNext())
{
return(-1);
}
int offset = ((KeyPair)enumerator.Current)._offset;
if (enumerator.MoveNext())
{
throw new FormatException("TermIndexAccessor -- Amount of offsets can not exceed 1 in the B-Tree");
}
return(offset);
}
finally
{
IDisposable disposable = enumerator as IDisposable;
if (disposable != null)
{
disposable.Dispose();
}
}
}
public override void Close()
{
base.Close();
// check whether close was issued before the index was actually loaded
if (TermId2RecordHandle != null)
{
TermId2RecordHandle.Close();
TermId2RecordHandle.Dispose();
TermId2RecordHandle = null;
}
}
protected void LoadOffsetsFromIndex()
{
foreach (int handle in _indexFile.GetAllFiles(false))
{
if (Core.State == CoreState.ShuttingDown)
{
break;
}
if (handle != HandleOfHeaderFile)
{
TermIndexRecord record = GetRecordByHandle(handle);
recordKey.SetIntKey(record.HC);
TermId2RecordHandle.InsertKey(recordKey, handle);
}
}
if (Core.State == CoreState.ShuttingDown)
{
TermId2RecordHandle.Clear();
}
}
public int AddRecord(int docId, int termId, object instances, int maxTermInDoc)
{
#region Preconditions
if (_indexFile == null)
{
throw new ApplicationException("Aplication has not initialized Accessor yet");
}
#endregion Preconditions
int recordHandle = GetRecordHandle(termId);
BinaryWriter writer;
if (recordHandle <= 0)
{
writer = _indexFile.AllocFile(out recordHandle);
TermId2RecordHandle.InsertKey(recordKey, recordHandle);
IndexConstructor.WriteCount(writer, termId);
}
else
{
int lastClusterHandle = GetRecordHandle(-termId);
int saved = lastClusterHandle;
writer = _indexFile.AppendFile(recordHandle, ref lastClusterHandle);
if (saved != lastClusterHandle)
{
if (saved > 0)
{
TermId2RecordHandle.DeleteKey(recordKey, saved);
}
TermId2RecordHandle.InsertKey(recordKey, lastClusterHandle);
}
}
++_savedRecords;
using ( writer )
{
IndexConstructor.WriteEntry(writer, docId, termId, instances, maxTermInDoc);
}
return(termId);
}