// XXX: Consider revising foreign lookup support
/// <summary>
/// Gets a <see cref="ChunkRef"/> for a chunk at the given local coordinates relative to this region.
/// </summary>
/// <param name="lcx">The local X-coordinate of a chunk relative to this region.</param>
/// <param name="lcz">The local Z-coordinate of a chunk relative to this region.</param>
/// <returns>A <see cref="ChunkRef"/> at the given local coordinates, or null if no chunk exists.</returns>
/// <remarks>The local coordinates do not strictly need to be within the bounds of the region. If coordinates are detected
/// as being out of bounds, the lookup will be delegated to the correct region and the lookup will be performed there
/// instead. This allows any <see cref="Region"/> to perform a similar task to <see cref="BetaChunkManager"/>, but with a
/// region-local frame of reference instead of a global frame of reference.</remarks>
public ChunkRef GetChunkRef(int lcx, int lcz)
{
if (!LocalBoundsCheck(lcx, lcz))
{
Region alt = GetForeignRegion(lcx, lcz);
return((alt == null) ? null : alt.GetChunkRef(ForeignX(lcx), ForeignZ(lcz)));
}
int cx = lcx + _rx * XDIM;
int cz = lcz + _rz * ZDIM;
ChunkKey k = new ChunkKey(cx, cz);
ChunkRef c = _cache.Fetch(k);
if (c != null)
{
return(c);
}
c = ChunkRef.Create(this, lcx, lcz);
if (c != null)
{
_cache.Insert(c);
}
return(c);
}
/// <inheritdoc/>
public ChunkRef SetChunk(int cx, int cz, Chunk chunk)
{
DeleteChunk(cx, cz);
chunk.SetLocation(cx, cz);
chunk.Save(GetChunkOutStream(cx, cz));
ChunkRef cr = ChunkRef.Create(this, cx, cz);
ChunkKey k = new ChunkKey(cx, cz);
_cache[k] = cr;
return(cr);
}
/// <inheritdoc/>
public ChunkRef CreateChunk(int cx, int cz)
{
DeleteChunk(cx, cz);
Chunk c = Chunk.Create(cx, cz);
c.Save(GetChunkOutStream(cx, cz));
ChunkRef cr = ChunkRef.Create(this, cx, cz);
ChunkKey k = new ChunkKey(cx, cz);
_cache[k] = cr;
return(cr);
}
/// <summary>
/// Saves an existing <see cref="Chunk"/> to the region at the given local coordinates.
/// </summary>
/// <param name="lcx">The local X-coordinate of a chunk relative to this region.</param>
/// <param name="lcz">The local Z-coordinate of a chunk relative to this region.</param>
/// <param name="chunk">A <see cref="Chunk"/> to save to the given location.</param>
/// <returns>A <see cref="ChunkRef"/> represneting the <see cref="Chunk"/> at its new location.</returns>
/// <remarks>If the local coordinates are out of bounds for this region, the action will be forwarded to the correct region
/// transparently. The <see cref="Chunk"/>'s internal global coordinates will be updated to reflect the new location.</remarks>
public ChunkRef SetChunk (int lcx, int lcz, Chunk chunk)
{
if (!LocalBoundsCheck(lcx, lcz)) {
Region alt = GetForeignRegion(lcx, lcz);
return (alt == null) ? null : alt.CreateChunk(ForeignX(lcx), ForeignZ(lcz));
}
DeleteChunk(lcx, lcz);
int cx = lcx + _rx * XDIM;
int cz = lcz + _rz * ZDIM;
chunk.SetLocation(cx, cz);
chunk.Save(GetChunkOutStream(lcx, lcz));
ChunkRef cr = ChunkRef.Create(this, lcx, lcz);
_cache.Insert(cr);
return cr;
}
/// <inheritdoc/>
public ChunkRef GetChunkRef(int cx, int cz)
{
ChunkKey k = new ChunkKey(cx, cz);
ChunkRef c = null;
//WeakReference chunkref = null;
if (_cache.TryGetValue(k, out c))
{
return(c);
}
c = ChunkRef.Create(this, cx, cz);
if (c != null)
{
_cache[k] = c;
}
return(c);
}
