/// <summary>
/// Moves to the next entry in the source.
/// After this call, IsValid() is true iff the iterator was not positioned at the last entry in the source.
/// REQUIRES: IsValid()
/// </summary>
public void Next()
{
LevelDBInterop.leveldb_iter_next(this.Handle);
this.Throw();
}
/// <summary>
/// Moves to the previous entry in the source.
/// After this call, IsValid() is true iff the iterator was not positioned at the first entry in source.
/// REQUIRES: IsValid()
/// </summary>
public void Prev()
{
LevelDBInterop.leveldb_iter_prev(this.Handle);
this.Throw();
}
/// <summary>
/// Position at the last key in the source.
/// The iterator is IsValid() after this call iff the source is not empty.
/// </summary>
public void SeekToLast()
{
LevelDBInterop.leveldb_iter_seek_to_last(this.Handle);
this.Throw();
}
/// <summary>
/// Position at the first key in the source that at or past target
/// The iterator is IsValid() after this call iff the source contains
/// an entry that comes at or past target.
/// </summary>
public void Seek(Byte[] key)
{
LevelDBInterop.leveldb_iter_seek(this.Handle, key, (IntPtr)key.Length);
this.Throw();
}
/// <summary>
/// If an error has occurred, throw it.
/// </summary>
private void Throw()
{
LevelDBInterop.leveldb_iter_get_error(this.Handle, out IntPtr error);
LevelDBException.Check(error);
GC.KeepAlive(this);
}
/// <summary>
///
/// </summary>
protected override void FreeUnManagedObjects()
{
LevelDBInterop.leveldb_iter_destroy(this.Handle);
}
/// <summary>
/// Support for iterating over a batch.
/// </summary>
public void Iterate(IntPtr state, Action <IntPtr, IntPtr, IntPtr, IntPtr, IntPtr> put, Action <IntPtr, IntPtr, IntPtr> deleted)
{
LevelDBInterop.leveldb_writebatch_iterate(Handle, state, put, deleted);
}
/// <summary>
///
/// </summary>
public WriteOptions() {
this.Handle = LevelDBInterop.leveldb_writeoptions_create();
}
/// <summary>
/// Store the mapping "key->value" in the database.
/// </summary>
public WriteBatch Put(byte[] key, byte[] value)
{
LevelDBInterop.leveldb_writebatch_put(Handle, key, (IntPtr)key.Length, value, (IntPtr)value.Length);
return(this);
}
/// <summary>
/// If the database contains a mapping for "key", erase it.
/// Else do nothing.
/// </summary>
public WriteBatch Delete(byte[] key)
{
LevelDBInterop.leveldb_writebatch_delete(Handle, key, (IntPtr)key.Length);
return(this);
}
/// <summary>
/// Clear all updates buffered in this batch.
/// </summary>
public void Clear()
{
LevelDBInterop.leveldb_writebatch_clear(Handle);
}
public WriteBatch()
{
Handle = LevelDBInterop.leveldb_writebatch_create();
}
/// <summary>
///
/// </summary>
public Options()
{
this.Handle = LevelDBInterop.leveldb_options_create();
}
/// <summary>
/// Return an iterator over the contents of the database.
/// The result of CreateIterator is initially invalid (caller must
/// call one of the Seek methods on the iterator before using it).
/// </summary>
public Iterator CreateIterator(ReadOptions options)
{
return(new Iterator(LevelDBInterop.leveldb_create_iterator(this.Handle, options.Handle), _encoding));
}
protected override void FreeUnManagedObjects()
{
LevelDBInterop.leveldb_writebatch_destroy(Handle);
}
/// <summary>
/// Return a handle to the current DB state.
/// Iterators and Gets created with this handle will all observe a stable snapshot of the current DB state.
/// </summary>
public SnapShot CreateSnapshot()
{
return(new SnapShot(LevelDBInterop.leveldb_create_snapshot(this.Handle), this));
}
/// <summary>
/// Support for iterating over a batch.
/// </summary>
public void Iterate(object state, Action <object, byte[], int, byte[], int> put, Action <object, byte[], int> deleted)
{
LevelDBInterop.leveldb_writebatch_iterate(this.Handle, state, put, deleted);
}
