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Abstract NPC-Library for Minecraft 1.8+ Servers
There is a newer version: 3.0.0-beta10
/*
 * This file is part of npc-lib, licensed under the MIT License (MIT).
 *
 * Copyright (c) 2022-2023 Julian M., Pasqual K. and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.github.juliarn.npclib.api.protocol.meta;

import com.github.juliarn.npclib.api.protocol.enums.EntityPose;
import com.github.juliarn.npclib.api.protocol.enums.EntityStatus;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

interface DefaultEntityMetadata {

  // https://wiki.vg/Entity_metadata#Entity - see index 0
  EntityMetadataFactory, Byte> ENTITY_STATUS =
    EntityMetadataFactory., Byte>metaFactoryBuilder()
      .baseIndex(0)
      .type(Byte.class)
      .inputConverter(rawEntries -> {
        // if there are no entries the mask is always 0
        int size = rawEntries.size();
        if (size == 0) {
          return (byte) 0;
        }

        // ensure that there are no duplicates
        Set entries;
        if (rawEntries instanceof Set) {
          // already a set - nice
          entries = (Set) rawEntries;
        } else {
          // copy over the elements
          entries = new HashSet<>(size + 1, 1f);
          entries.addAll(rawEntries);
        }

        // calculate the bitmask to send
        byte entryMask = 0;
        for (EntityStatus entry : entries) {
          entryMask |= entry.bitmask();
        }

        return entryMask;
      }).build();

  // https://wiki.vg/Entity_metadata#Entity - see index 0 and 6
  EntityMetadataFactory SNEAKING = EntityMetadataFactory.metaFactoryBuilder()
    .baseIndex(0)
    .type(Byte.class)
    .inputConverter(value -> (byte) (value ? 0x02 : 0x00))
    .addRelatedMetadata(EntityMetadataFactory.metaFactoryBuilder()
      .baseIndex(6)
      .type(EntityPose.class)
      .inputConverter(value -> value ? EntityPose.CROUCHING : EntityPose.STANDING)
      .availabilityChecker(versionAccessor -> versionAccessor.atLeast(1, 14, 0))
      .build())
    .build();

  // https://wiki.vg/Entity_metadata#Player - see index 10
  EntityMetadataFactory SKIN_LAYERS = EntityMetadataFactory.metaFactoryBuilder()
    .baseIndex(10)
    .type(Byte.class)
    .indexShiftVersions(9, 9, 10, 14, 14, 15, 17)
    .inputConverter(value -> (byte) (value ? 0xff : 0x00))
    .build();
}