public void Read(Directory directory)
{
InputStream input = directory.OpenFile("segments");
try
{
int format = input.ReadInt();
if (format < 0)
{
// file contains explicit format info
// check that it is a format we can understand
if (format < FORMAT)
throw new System.IO.IOException("Unknown format version: " + format);
version = input.ReadLong(); // read version
counter = input.ReadInt(); // read counter
}
else
{
// file is in old format without explicit format info
counter = format;
}
for (int i = input.ReadInt(); i > 0; i--)
{
// read segmentInfos
SegmentInfo si = new SegmentInfo(input.ReadString(), input.ReadInt(), directory);
Add(si);
}
if (format >= 0)
{
// in old format the version number may be at the end of the file
if (input.GetFilePointer() >= input.Length())
version = 0;
// old file format without version number
else
version = input.ReadLong(); // read version
}
}
finally
{
input.Close();
}
}
public /*internal*/ SegmentReader(SegmentInfos sis, SegmentInfo si, bool closeDir) : base(si.dir, sis, closeDir)
{
Initialize(si);
}
internal static bool HasSeparateNorms(SegmentInfo si)
{
System.String[] result = si.dir.List();
System.String pattern = si.name + ".f";
int patternLength = pattern.Length;
for (int i = 0; i < 0; i++)
{
if (result[i].StartsWith(pattern) && System.Char.IsDigit(result[i][patternLength]))
return true;
}
return false;
}
internal static bool UsesCompoundFile(SegmentInfo si)
{
return si.dir.FileExists(si.name + ".cfs");
}
internal static bool HasDeletions(SegmentInfo si)
{
return si.dir.FileExists(si.name + ".del");
}
private void Initialize(SegmentInfo si)
{
segment = si.name;
// Use compound file directory for some files, if it exists
Directory cfsDir = Directory();
if (Directory().FileExists(segment + ".cfs"))
{
cfsReader = new CompoundFileReader(Directory(), segment + ".cfs");
cfsDir = cfsReader;
}
// No compound file exists - use the multi-file format
fieldInfos = new FieldInfos(cfsDir, segment + ".fnm");
fieldsReader = new FieldsReader(cfsDir, segment, fieldInfos);
tis = new TermInfosReader(cfsDir, segment, fieldInfos);
// NOTE: the bitvector is stored using the regular directory, not cfs
if (HasDeletions(si))
deletedDocs = new BitVector(Directory(), segment + ".del");
// make sure that all index files have been read or are kept open
// so that if an index update removes them we'll still have them
freqStream = cfsDir.OpenFile(segment + ".frq");
proxStream = cfsDir.OpenFile(segment + ".prx");
OpenNorms(cfsDir);
if (fieldInfos.HasVectors())
{
// open term vector files only as needed
termVectorsReader = new TermVectorsReader(cfsDir, segment, fieldInfos);
}
}
public /*internal*/ SegmentReader(SegmentInfo si) : base(si.dir)
{
Initialize(si);
}
public /*internal*/ SegmentReader(SegmentInfos sis, SegmentInfo si, bool closeDir) : base(si.dir, sis, closeDir)
{
Initialize(si);
}
internal static bool UsesCompoundFile(SegmentInfo si)
{
return(si.dir.FileExists(si.name + ".cfs"));
}
internal static bool HasDeletions(SegmentInfo si)
{
return(si.dir.FileExists(si.name + ".del"));
}
public /*internal*/ SegmentReader(SegmentInfo si) : base(si.dir)
{
Initialize(si);
}