internal Iterator(DB db, ReadOptions opt)
{
_db = db;
if (opt == null)
{
opt = new ReadOptions();
}
_handle = LevelDBImpl.leveldb_create_iterator(db._dbHandle, opt.Handle);
IsFirstMove = true;
}
private void OpenImpl(string name)
{
if (_optionsHandle == IntPtr.Zero)
{
SetOptions();
}
IntPtr err;
_dbHandle = LevelDBImpl.leveldb_open(_optionsHandle, name, out err);
LevelDBImpl.ThrowError(err);
}
private void SetOptions(bool createIfMissing = false, bool errorIfExists = false, bool paranoidChecks = false, int writeBufferSize = 0, int maxOpenFile = 0, Cache blockCache = null, int blockSize = 0, int blockRestartInterval = 0, CompressionType compressionType = CompressionType.NoCompression)
{
IntPtr handle = LevelDBImpl.leveldb_options_create();
if (createIfMissing)
{
LevelDBImpl.leveldb_options_set_create_if_missing(handle, true);
}
if (errorIfExists)
{
LevelDBImpl.leveldb_options_set_error_if_exists(handle, true);
}
if (paranoidChecks)
{
LevelDBImpl.leveldb_options_set_paranoid_checks(handle, true);
}
if (writeBufferSize > 0)
{
LevelDBImpl.leveldb_options_set_write_buffer_size(handle, (UIntPtr)writeBufferSize);
}
if (maxOpenFile > 0)
{
LevelDBImpl.leveldb_options_set_max_open_files(handle, maxOpenFile);
}
if (blockCache != null)
{
LevelDBImpl.leveldb_options_set_cache(handle, blockCache.Handle);
}
if (blockSize > 0)
{
LevelDBImpl.leveldb_options_set_block_size(handle, (UIntPtr)blockSize);
}
if (blockRestartInterval > 0)
{
LevelDBImpl.leveldb_options_set_block_restart_interval(handle, blockRestartInterval);
}
LevelDBImpl.leveldb_options_set_compression(handle, (int)compressionType);
_optionsHandle = handle;
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
}
if (_optionsHandle != IntPtr.Zero)
{
LevelDBImpl.leveldb_options_destroy(_optionsHandle);
}
if (_dbHandle != IntPtr.Zero)
{
LevelDBImpl.leveldb_close(_dbHandle);
}
}
public void Delete(byte[] key, WriteOptions options)
{
LevelDBImpl.Delete(_dbHandle, options.Handle, key);
}
public void Put(byte[] key, byte[] value, WriteOptions options)
{
LevelDBImpl.Put(_dbHandle, options.Handle, key, value);
}
public byte[] Get(byte[] key, ReadOptions options)
{
return(LevelDBImpl.Get(_dbHandle, options.Handle, key));
}
public void Next()
{
LevelDBImpl.leveldb_iter_next(_handle);
}
public void Previous()
{
LevelDBImpl.leveldb_iter_prev(_handle);
}
public void Seek(string key)
{
LevelDBImpl.leveldb_iter_seek(_handle, key, key.UTF8Length());
}
public void SeekToLast()
{
LevelDBImpl.leveldb_iter_seek_to_last(_handle);
}
public void SeekToFirst()
{
LevelDBImpl.leveldb_iter_seek_to_first(_handle);
}
public static Cache Create(int capacity)
{
return(new Cache(LevelDBImpl.leveldb_cache_create_lru((UIntPtr)capacity)));
}
public WriteOptions()
{
_handle = LevelDBImpl.leveldb_writeoptions_create();
}
public ReadOptions()
{
_handle = LevelDBImpl.leveldb_readoptions_create();
}
