110 lines
4.4 KiB
Java
110 lines
4.4 KiB
Java
/*
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* This file is part of BlueMap, licensed under the MIT License (MIT).
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*
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* Copyright (c) Blue (Lukas Rieger) <https://bluecolored.de>
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* Copyright (c) contributors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package de.bluecolored.bluemap.core.world.mca.chunk;
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import de.bluecolored.bluemap.core.storage.Compression;
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import de.bluecolored.bluemap.core.world.mca.MCAUtil;
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import de.bluecolored.bluemap.core.world.mca.MCAWorld;
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import lombok.Getter;
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import lombok.RequiredArgsConstructor;
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import org.jetbrains.annotations.Nullable;
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import java.io.BufferedInputStream;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.List;
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import java.util.function.BiFunction;
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public class ChunkLoader {
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private final MCAWorld world;
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public ChunkLoader(MCAWorld world) {
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this.world = world;
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}
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// sorted list of chunk-versions, loaders at the start of the list are preferred over loaders at the end
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private static final List<ChunkVersionLoader<?>> CHUNK_VERSION_LOADERS = List.of(
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new ChunkVersionLoader<>(Chunk_1_18.Data.class, Chunk_1_18::new, 2844),
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new ChunkVersionLoader<>(Chunk_1_16.Data.class, Chunk_1_16::new, 2500),
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new ChunkVersionLoader<>(Chunk_1_15.Data.class, Chunk_1_15::new, 2200),
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new ChunkVersionLoader<>(Chunk_1_13.Data.class, Chunk_1_13::new, 0)
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);
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private ChunkVersionLoader<?> lastUsedLoader = CHUNK_VERSION_LOADERS.get(0);
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public MCAChunk load(byte[] data, int offset, int length, Compression compression) throws IOException {
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InputStream in = new ByteArrayInputStream(data, offset, length);
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in.mark(-1);
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// try last used version
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ChunkVersionLoader<?> usedLoader = lastUsedLoader;
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MCAChunk chunk;
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try (InputStream decompressedIn = new BufferedInputStream(compression.decompress(in))) {
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chunk = usedLoader.load(world, decompressedIn);
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}
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// check version and reload chunk if the wrong loader has been used and a better one has been found
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ChunkVersionLoader<?> actualLoader = findBestLoaderForVersion(chunk.getDataVersion());
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if (actualLoader != null && usedLoader != actualLoader) {
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in.reset(); // reset read position
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try (InputStream decompressedIn = new BufferedInputStream(compression.decompress(in))) {
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chunk = actualLoader.load(world, decompressedIn);
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}
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lastUsedLoader = actualLoader;
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}
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return chunk;
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}
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private @Nullable ChunkVersionLoader<?> findBestLoaderForVersion(int version) {
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for (ChunkVersionLoader<?> loader : CHUNK_VERSION_LOADERS) {
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if (loader.mightSupport(version)) return loader;
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}
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return null;
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}
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@RequiredArgsConstructor
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@Getter
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private static class ChunkVersionLoader<D extends MCAChunk.Data> {
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private final Class<D> dataType;
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private final BiFunction<MCAWorld, D, MCAChunk> constructor;
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private final int dataVersion;
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public MCAChunk load(MCAWorld world, InputStream in) throws IOException {
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D data = MCAUtil.BLUENBT.read(in, dataType);
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return mightSupport(data.getDataVersion()) ? constructor.apply(world, data) : new MCAChunk(world, data) {};
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}
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public boolean mightSupport(int dataVersion) {
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return dataVersion >= this.dataVersion;
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}
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}
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}
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