Code/net/minecraft/util/HashOps.java

package net.minecraft.util;

import com.google.common.hash.HashCode;
import com.google.common.hash.HashFunction;
import com.google.common.hash.Hasher;
import com.google.common.hash.Hashing;
import com.mojang.datafixers.util.Pair;
import com.mojang.serialization.DataResult;
import com.mojang.serialization.DynamicOps;
import com.mojang.serialization.ListBuilder;
import com.mojang.serialization.MapLike;
import com.mojang.serialization.RecordBuilder;
import com.mojang.serialization.RecordBuilder.AbstractUniversalBuilder;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.function.BiConsumer;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.stream.IntStream;
import java.util.stream.LongStream;
import java.util.stream.Stream;

public class HashOps implements DynamicOps<HashCode> {
    private static final byte TAG_EMPTY = 1;
    private static final byte TAG_MAP_START = 2;
    private static final byte TAG_MAP_END = 3;
    private static final byte TAG_LIST_START = 4;
    private static final byte TAG_LIST_END = 5;
    private static final byte TAG_BYTE = 6;
    private static final byte TAG_SHORT = 7;
    private static final byte TAG_INT = 8;
    private static final byte TAG_LONG = 9;
    private static final byte TAG_FLOAT = 10;
    private static final byte TAG_DOUBLE = 11;
    private static final byte TAG_STRING = 12;
    private static final byte TAG_BOOLEAN = 13;
    private static final byte TAG_BYTE_ARRAY_START = 14;
    private static final byte TAG_BYTE_ARRAY_END = 15;
    private static final byte TAG_INT_ARRAY_START = 16;
    private static final byte TAG_INT_ARRAY_END = 17;
    private static final byte TAG_LONG_ARRAY_START = 18;
    private static final byte TAG_LONG_ARRAY_END = 19;
    private static final byte[] EMPTY_PAYLOAD = new byte[]{1};
    private static final byte[] FALSE_PAYLOAD = new byte[]{13, 0};
    private static final byte[] TRUE_PAYLOAD = new byte[]{13, 1};
    public static final byte[] EMPTY_MAP_PAYLOAD = new byte[]{2, 3};
    public static final byte[] EMPTY_LIST_PAYLOAD = new byte[]{4, 5};
    private static final DataResult<Object> UNSUPPORTED_OPERATION_ERROR = DataResult.error(() -> "Unsupported operation");
    private static final Comparator<HashCode> HASH_COMPARATOR = Comparator.comparingLong(HashCode::padToLong);
    private static final Comparator<Entry<HashCode, HashCode>> MAP_ENTRY_ORDER = Entry.<HashCode, HashCode>comparingByKey(HASH_COMPARATOR)
        .thenComparing(Entry.comparingByValue(HASH_COMPARATOR));
    private static final Comparator<Pair<HashCode, HashCode>> MAPLIKE_ENTRY_ORDER = Comparator.<Pair<HashCode, HashCode>, HashCode>comparing(Pair::getFirst, HASH_COMPARATOR)
        .thenComparing(Pair::getSecond, HASH_COMPARATOR);
    public static final HashOps CRC32C_INSTANCE = new HashOps(Hashing.crc32c());
    final HashFunction hashFunction;
    final HashCode empty;
    private final HashCode emptyMap;
    private final HashCode emptyList;
    private final HashCode trueHash;
    private final HashCode falseHash;

    public HashOps(HashFunction p_397329_) {
        this.hashFunction = p_397329_;
        this.empty = p_397329_.hashBytes(EMPTY_PAYLOAD);
        this.emptyMap = p_397329_.hashBytes(EMPTY_MAP_PAYLOAD);
        this.emptyList = p_397329_.hashBytes(EMPTY_LIST_PAYLOAD);
        this.falseHash = p_397329_.hashBytes(FALSE_PAYLOAD);
        this.trueHash = p_397329_.hashBytes(TRUE_PAYLOAD);
    }

    public HashCode empty() {
        return this.empty;
    }

    public HashCode emptyMap() {
        return this.emptyMap;
    }

    public HashCode emptyList() {
        return this.emptyList;
    }

    public HashCode createNumeric(Number p_397688_) {
        return switch (p_397688_) {
            case Byte obyte -> this.createByte(obyte);
            case Short oshort -> this.createShort(oshort);
            case Integer integer -> this.createInt(integer);
            case Long olong -> this.createLong(olong);
            case Double d0 -> this.createDouble(d0);
            case Float f -> this.createFloat(f);
            default -> this.createDouble(p_397688_.doubleValue());
        };
    }

    public HashCode createByte(byte p_396691_) {
        return this.hashFunction.newHasher(2).putByte((byte)6).putByte(p_396691_).hash();
    }

    public HashCode createShort(short p_392813_) {
        return this.hashFunction.newHasher(3).putByte((byte)7).putShort(p_392813_).hash();
    }

    public HashCode createInt(int p_395249_) {
        return this.hashFunction.newHasher(5).putByte((byte)8).putInt(p_395249_).hash();
    }

    public HashCode createLong(long p_392135_) {
        return this.hashFunction.newHasher(9).putByte((byte)9).putLong(p_392135_).hash();
    }

    public HashCode createFloat(float p_394026_) {
        return this.hashFunction.newHasher(5).putByte((byte)10).putFloat(p_394026_).hash();
    }

    public HashCode createDouble(double p_394179_) {
        return this.hashFunction.newHasher(9).putByte((byte)11).putDouble(p_394179_).hash();
    }

    public HashCode createString(String p_392797_) {
        return this.hashFunction.newHasher().putByte((byte)12).putInt(p_392797_.length()).putUnencodedChars(p_392797_).hash();
    }

    public HashCode createBoolean(boolean p_397569_) {
        return p_397569_ ? this.trueHash : this.falseHash;
    }

    private static Hasher hashMap(Hasher p_397613_, Map<HashCode, HashCode> p_396942_) {
        p_397613_.putByte((byte)2);
        p_396942_.entrySet()
            .stream()
            .sorted(MAP_ENTRY_ORDER)
            .forEach(p_392920_ -> p_397613_.putBytes(p_392920_.getKey().asBytes()).putBytes(p_392920_.getValue().asBytes()));
        p_397613_.putByte((byte)3);
        return p_397613_;
    }

    static Hasher hashMap(Hasher p_392551_, Stream<Pair<HashCode, HashCode>> p_398023_) {
        p_392551_.putByte((byte)2);
        p_398023_.sorted(MAPLIKE_ENTRY_ORDER).forEach(p_392939_ -> p_392551_.putBytes(p_392939_.getFirst().asBytes()).putBytes(p_392939_.getSecond().asBytes()));
        p_392551_.putByte((byte)3);
        return p_392551_;
    }

    public HashCode createMap(Stream<Pair<HashCode, HashCode>> p_396656_) {
        return hashMap(this.hashFunction.newHasher(), p_396656_).hash();
    }

    public HashCode createMap(Map<HashCode, HashCode> p_393057_) {
        return hashMap(this.hashFunction.newHasher(), p_393057_).hash();
    }

    public HashCode createList(Stream<HashCode> p_398039_) {
        Hasher hasher = this.hashFunction.newHasher();
        hasher.putByte((byte)4);
        p_398039_.forEach(p_397145_ -> hasher.putBytes(p_397145_.asBytes()));
        hasher.putByte((byte)5);
        return hasher.hash();
    }

    public HashCode createByteList(ByteBuffer p_393066_) {
        Hasher hasher = this.hashFunction.newHasher();
        hasher.putByte((byte)14);
        hasher.putBytes(p_393066_);
        hasher.putByte((byte)15);
        return hasher.hash();
    }

    public HashCode createIntList(IntStream p_392378_) {
        Hasher hasher = this.hashFunction.newHasher();
        hasher.putByte((byte)16);
        p_392378_.forEach(hasher::putInt);
        hasher.putByte((byte)17);
        return hasher.hash();
    }

    public HashCode createLongList(LongStream p_395866_) {
        Hasher hasher = this.hashFunction.newHasher();
        hasher.putByte((byte)18);
        p_395866_.forEach(hasher::putLong);
        hasher.putByte((byte)19);
        return hasher.hash();
    }

    public HashCode remove(HashCode p_394547_, String p_395616_) {
        return p_394547_;
    }

    @Override
    public RecordBuilder<HashCode> mapBuilder() {
        return new HashOps.MapHashBuilder();
    }

    @Override
    public ListBuilder<HashCode> listBuilder() {
        return new HashOps.ListHashBuilder();
    }

    @Override
    public String toString() {
        return "Hash " + this.hashFunction;
    }

    public <U> U convertTo(DynamicOps<U> p_394392_, HashCode p_396939_) {
        throw new UnsupportedOperationException("Can't convert from this type");
    }

    public Number getNumberValue(HashCode p_396836_, Number p_396683_) {
        return p_396683_;
    }

    public HashCode set(HashCode p_392609_, String p_394861_, HashCode p_396034_) {
        return p_392609_;
    }

    public HashCode update(HashCode p_393943_, String p_397765_, Function<HashCode, HashCode> p_393638_) {
        return p_393943_;
    }

    public HashCode updateGeneric(HashCode p_394295_, HashCode p_397939_, Function<HashCode, HashCode> p_391335_) {
        return p_394295_;
    }

    private static <T> DataResult<T> unsupported() {
        return (DataResult<T>)UNSUPPORTED_OPERATION_ERROR;
    }

    public DataResult<HashCode> get(HashCode p_397791_, String p_393212_) {
        return unsupported();
    }

    public DataResult<HashCode> getGeneric(HashCode p_392165_, HashCode p_395432_) {
        return unsupported();
    }

    public DataResult<Number> getNumberValue(HashCode p_394009_) {
        return unsupported();
    }

    public DataResult<Boolean> getBooleanValue(HashCode p_397324_) {
        return unsupported();
    }

    public DataResult<String> getStringValue(HashCode p_397603_) {
        return unsupported();
    }

    public DataResult<HashCode> mergeToList(HashCode p_395328_, HashCode p_397519_) {
        return unsupported();
    }

    public DataResult<HashCode> mergeToList(HashCode p_392335_, List<HashCode> p_393705_) {
        return unsupported();
    }

    public DataResult<HashCode> mergeToMap(HashCode p_397103_, HashCode p_393644_, HashCode p_397786_) {
        return unsupported();
    }

    public DataResult<HashCode> mergeToMap(HashCode p_394828_, Map<HashCode, HashCode> p_392230_) {
        return unsupported();
    }

    public DataResult<HashCode> mergeToMap(HashCode p_393002_, MapLike<HashCode> p_397657_) {
        return unsupported();
    }

    public DataResult<Stream<Pair<HashCode, HashCode>>> getMapValues(HashCode p_394873_) {
        return unsupported();
    }

    public DataResult<Consumer<BiConsumer<HashCode, HashCode>>> getMapEntries(HashCode p_395753_) {
        return unsupported();
    }

    public DataResult<Stream<HashCode>> getStream(HashCode p_397363_) {
        return unsupported();
    }

    public DataResult<Consumer<Consumer<HashCode>>> getList(HashCode p_391333_) {
        return unsupported();
    }

    public DataResult<MapLike<HashCode>> getMap(HashCode p_391961_) {
        return unsupported();
    }

    public DataResult<ByteBuffer> getByteBuffer(HashCode p_393051_) {
        return unsupported();
    }

    public DataResult<IntStream> getIntStream(HashCode p_395829_) {
        return unsupported();
    }

    public DataResult<LongStream> getLongStream(HashCode p_392986_) {
        return unsupported();
    }

    class ListHashBuilder extends AbstractListBuilder<HashCode, Hasher> {
        public ListHashBuilder() {
            super(HashOps.this);
        }

        protected Hasher initBuilder() {
            return HashOps.this.hashFunction.newHasher().putByte((byte)4);
        }

        protected Hasher append(Hasher p_394930_, HashCode p_392558_) {
            return p_394930_.putBytes(p_392558_.asBytes());
        }

        protected DataResult<HashCode> build(Hasher p_394248_, HashCode p_391292_) {
            assert p_391292_.equals(HashOps.this.empty);

            p_394248_.putByte((byte)5);
            return DataResult.success(p_394248_.hash());
        }
    }

    final class MapHashBuilder extends AbstractUniversalBuilder<HashCode, List<Pair<HashCode, HashCode>>> {
        public MapHashBuilder() {
            super(HashOps.this);
        }

        protected List<Pair<HashCode, HashCode>> initBuilder() {
            return new ArrayList<>();
        }

        protected List<Pair<HashCode, HashCode>> append(HashCode p_391659_, HashCode p_392968_, List<Pair<HashCode, HashCode>> p_394869_) {
            p_394869_.add(Pair.of(p_391659_, p_392968_));
            return p_394869_;
        }

        protected DataResult<HashCode> build(List<Pair<HashCode, HashCode>> p_396177_, HashCode p_392314_) {
            assert p_392314_.equals(HashOps.this.empty());

            return DataResult.success(HashOps.hashMap(HashOps.this.hashFunction.newHasher(), p_396177_.stream()).hash());
        }
    }
}