86 lines
3.2 KiB
Java
86 lines
3.2 KiB
Java
package de.bluecolored.bluemap.core.world.mca.chunk;
|
|
|
|
import de.bluecolored.bluemap.core.storage.Compression;
|
|
import de.bluecolored.bluemap.core.world.mca.MCAUtil;
|
|
import de.bluecolored.bluemap.core.world.mca.MCAWorld;
|
|
import lombok.Getter;
|
|
import lombok.RequiredArgsConstructor;
|
|
import org.jetbrains.annotations.Nullable;
|
|
|
|
import java.io.BufferedInputStream;
|
|
import java.io.ByteArrayInputStream;
|
|
import java.io.IOException;
|
|
import java.io.InputStream;
|
|
import java.util.List;
|
|
import java.util.function.BiFunction;
|
|
|
|
public class ChunkLoader {
|
|
|
|
private final MCAWorld world;
|
|
|
|
public ChunkLoader(MCAWorld world) {
|
|
this.world = world;
|
|
}
|
|
|
|
// sorted list of chunk-versions, loaders at the start of the list are preferred over loaders at the end
|
|
private static final List<ChunkVersionLoader<?>> CHUNK_VERSION_LOADERS = List.of(
|
|
new ChunkVersionLoader<>(Chunk_1_18.Data.class, Chunk_1_18::new, 2844),
|
|
new ChunkVersionLoader<>(Chunk_1_16.Data.class, Chunk_1_16::new, 2500),
|
|
new ChunkVersionLoader<>(Chunk_1_15.Data.class, Chunk_1_15::new, 2200),
|
|
new ChunkVersionLoader<>(Chunk_1_13.Data.class, Chunk_1_13::new, 0)
|
|
);
|
|
|
|
private ChunkVersionLoader<?> lastUsedLoader = CHUNK_VERSION_LOADERS.get(0);
|
|
|
|
public MCAChunk load(byte[] data, int offset, int length, Compression compression) throws IOException {
|
|
InputStream in = new ByteArrayInputStream(data, offset, length);
|
|
in.mark(-1);
|
|
|
|
// try last used version
|
|
ChunkVersionLoader<?> usedLoader = lastUsedLoader;
|
|
MCAChunk chunk;
|
|
try (InputStream decompressedIn = new BufferedInputStream(compression.decompress(in))) {
|
|
chunk = usedLoader.load(world, decompressedIn);
|
|
}
|
|
|
|
// check version and reload chunk if the wrong loader has been used and a better one has been found
|
|
ChunkVersionLoader<?> actualLoader = findBestLoaderForVersion(chunk.getDataVersion());
|
|
if (actualLoader != null && usedLoader != actualLoader) {
|
|
in.reset(); // reset read position
|
|
try (InputStream decompressedIn = new BufferedInputStream(compression.decompress(in))) {
|
|
chunk = actualLoader.load(world, decompressedIn);
|
|
}
|
|
lastUsedLoader = actualLoader;
|
|
}
|
|
|
|
return chunk;
|
|
}
|
|
|
|
private @Nullable ChunkVersionLoader<?> findBestLoaderForVersion(int version) {
|
|
for (ChunkVersionLoader<?> loader : CHUNK_VERSION_LOADERS) {
|
|
if (loader.mightSupport(version)) return loader;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
@RequiredArgsConstructor
|
|
@Getter
|
|
private static class ChunkVersionLoader<D extends MCAChunk.Data> {
|
|
|
|
private final Class<D> dataType;
|
|
private final BiFunction<MCAWorld, D, MCAChunk> constructor;
|
|
private final int dataVersion;
|
|
|
|
public MCAChunk load(MCAWorld world, InputStream in) throws IOException {
|
|
D data = MCAUtil.BLUENBT.read(in, dataType);
|
|
return mightSupport(data.getDataVersion()) ? constructor.apply(world, data) : new MCAChunk(world, data) {};
|
|
}
|
|
|
|
public boolean mightSupport(int dataVersion) {
|
|
return dataVersion >= this.dataVersion;
|
|
}
|
|
|
|
}
|
|
|
|
}
|