public bool TryLoad(string path, IndexLoadOptions options)
{
try
{
_directory = FSDirectory.Open(path);
_reader = IndexReader.Open(_directory, options.ReadOnly);
if (options.ForceUnlock && _directory.FileExists(IndexWriter.WRITE_LOCK_NAME))
{
_directory.ClearLock(IndexWriter.WRITE_LOCK_NAME);
}
var fields = _reader.GetFieldNames(IndexReader.FieldOption.ALL);
_numFields = fields.Count;
CountTerms();
foreach (var file in _directory.ListAll())
{
try
{
string fpath = Path.Combine(_directory.Directory.ToString(), file);
if (_lastModified == null)
{
_lastModified = File.GetLastWriteTimeUtc(fpath);
}
else
{
var mod = File.GetLastWriteTimeUtc(fpath);
if (mod > _lastModified.Value)
{
_lastModified = mod;
}
}
}
catch
{
// ignore
}
}
_loaded = true;
return(true);
}
catch
{
_directory = null;
_reader = null;
_numFields = 0;
_numTerms = 0;
_loaded = false;
_lastModified = null;
return(false);
}
}
private void EnsureIndexVersionMatches(FSDirectory directory)
{
if (directory.FileExists(indexVersionFilename) == false)
{
throw new InvalidOperationException("Could not find " + indexVersionFilename + " for '" + this.name + "', resetting index");
}
using (var indexInput = directory.OpenInput(indexVersionFilename))
{
var versionToCheck = IndexVersion;
var versionFromDisk = indexInput.ReadString();
if (versionFromDisk != versionToCheck)
{
throw new InvalidOperationException("Index for " + this.name + " is of version " + versionFromDisk +
" which is not compatible with " + versionToCheck + ", resetting index");
}
}
}
/// <summary>Returns true if a file with the given name exists. </summary>
public override bool FileExists(string name)
{
//always from the real dir
return(_realDirectory.FileExists(name));
}