Code/net/minecraft/world/level/block/state/pattern/BlockPattern.java

package net.minecraft.world.level.block.state.pattern;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.MoreObjects;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import java.util.function.Predicate;
import javax.annotation.Nullable;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.core.Vec3i;
import net.minecraft.world.level.LevelReader;

public class BlockPattern {
    private final Predicate<BlockInWorld>[][][] pattern;
    private final int depth;
    private final int height;
    private final int width;

    public BlockPattern(Predicate<BlockInWorld>[][][] p_61182_) {
        this.pattern = p_61182_;
        this.depth = p_61182_.length;
        if (this.depth > 0) {
            this.height = p_61182_[0].length;
            if (this.height > 0) {
                this.width = p_61182_[0][0].length;
            } else {
                this.width = 0;
            }
        } else {
            this.height = 0;
            this.width = 0;
        }
    }

    public int getDepth() {
        return this.depth;
    }

    public int getHeight() {
        return this.height;
    }

    public int getWidth() {
        return this.width;
    }

    @VisibleForTesting
    public Predicate<BlockInWorld>[][][] getPattern() {
        return this.pattern;
    }

    @Nullable
    @VisibleForTesting
    public BlockPattern.BlockPatternMatch matches(LevelReader p_155965_, BlockPos p_155966_, Direction p_155967_, Direction p_155968_) {
        LoadingCache<BlockPos, BlockInWorld> loadingcache = createLevelCache(p_155965_, false);
        return this.matches(p_155966_, p_155967_, p_155968_, loadingcache);
    }

    @Nullable
    private BlockPattern.BlockPatternMatch matches(BlockPos p_61198_, Direction p_61199_, Direction p_61200_, LoadingCache<BlockPos, BlockInWorld> p_61201_) {
        for (int i = 0; i < this.width; i++) {
            for (int j = 0; j < this.height; j++) {
                for (int k = 0; k < this.depth; k++) {
                    if (!this.pattern[k][j][i].test(p_61201_.getUnchecked(translateAndRotate(p_61198_, p_61199_, p_61200_, i, j, k)))) {
                        return null;
                    }
                }
            }
        }

        return new BlockPattern.BlockPatternMatch(p_61198_, p_61199_, p_61200_, p_61201_, this.width, this.height, this.depth);
    }

    @Nullable
    public BlockPattern.BlockPatternMatch find(LevelReader p_61185_, BlockPos p_61186_) {
        LoadingCache<BlockPos, BlockInWorld> loadingcache = createLevelCache(p_61185_, false);
        int i = Math.max(Math.max(this.width, this.height), this.depth);

        for (BlockPos blockpos : BlockPos.betweenClosed(p_61186_, p_61186_.offset(i - 1, i - 1, i - 1))) {
            for (Direction direction : Direction.values()) {
                for (Direction direction1 : Direction.values()) {
                    if (direction1 != direction && direction1 != direction.getOpposite()) {
                        BlockPattern.BlockPatternMatch blockpattern$blockpatternmatch = this.matches(blockpos, direction, direction1, loadingcache);
                        if (blockpattern$blockpatternmatch != null) {
                            return blockpattern$blockpatternmatch;
                        }
                    }
                }
            }
        }

        return null;
    }

    public static LoadingCache<BlockPos, BlockInWorld> createLevelCache(LevelReader p_61188_, boolean p_61189_) {
        return CacheBuilder.newBuilder().build(new BlockPattern.BlockCacheLoader(p_61188_, p_61189_));
    }

    protected static BlockPos translateAndRotate(BlockPos p_61191_, Direction p_61192_, Direction p_61193_, int p_61194_, int p_61195_, int p_61196_) {
        if (p_61192_ != p_61193_ && p_61192_ != p_61193_.getOpposite()) {
            Vec3i vec3i = new Vec3i(p_61192_.getStepX(), p_61192_.getStepY(), p_61192_.getStepZ());
            Vec3i vec3i1 = new Vec3i(p_61193_.getStepX(), p_61193_.getStepY(), p_61193_.getStepZ());
            Vec3i vec3i2 = vec3i.cross(vec3i1);
            return p_61191_.offset(
                vec3i1.getX() * -p_61195_ + vec3i2.getX() * p_61194_ + vec3i.getX() * p_61196_,
                vec3i1.getY() * -p_61195_ + vec3i2.getY() * p_61194_ + vec3i.getY() * p_61196_,
                vec3i1.getZ() * -p_61195_ + vec3i2.getZ() * p_61194_ + vec3i.getZ() * p_61196_
            );
        } else {
            throw new IllegalArgumentException("Invalid forwards & up combination");
        }
    }

    static class BlockCacheLoader extends CacheLoader<BlockPos, BlockInWorld> {
        private final LevelReader level;
        private final boolean loadChunks;

        public BlockCacheLoader(LevelReader p_61207_, boolean p_61208_) {
            this.level = p_61207_;
            this.loadChunks = p_61208_;
        }

        public BlockInWorld load(BlockPos p_61210_) {
            return new BlockInWorld(this.level, p_61210_, this.loadChunks);
        }
    }

    public static class BlockPatternMatch {
        private final BlockPos frontTopLeft;
        private final Direction forwards;
        private final Direction up;
        private final LoadingCache<BlockPos, BlockInWorld> cache;
        private final int width;
        private final int height;
        private final int depth;

        public BlockPatternMatch(
            BlockPos p_61221_, Direction p_61222_, Direction p_61223_, LoadingCache<BlockPos, BlockInWorld> p_61224_, int p_61225_, int p_61226_, int p_61227_
        ) {
            this.frontTopLeft = p_61221_;
            this.forwards = p_61222_;
            this.up = p_61223_;
            this.cache = p_61224_;
            this.width = p_61225_;
            this.height = p_61226_;
            this.depth = p_61227_;
        }

        public BlockPos getFrontTopLeft() {
            return this.frontTopLeft;
        }

        public Direction getForwards() {
            return this.forwards;
        }

        public Direction getUp() {
            return this.up;
        }

        public int getWidth() {
            return this.width;
        }

        public int getHeight() {
            return this.height;
        }

        public int getDepth() {
            return this.depth;
        }

        public BlockInWorld getBlock(int p_61230_, int p_61231_, int p_61232_) {
            return this.cache.getUnchecked(BlockPattern.translateAndRotate(this.frontTopLeft, this.getForwards(), this.getUp(), p_61230_, p_61231_, p_61232_));
        }

        @Override
        public String toString() {
            return MoreObjects.toStringHelper(this).add("up", this.up).add("forwards", this.forwards).add("frontTopLeft", this.frontTopLeft).toString();
        }
    }
}