minecraft-source/src/net/minecraft/world/item/SpawnEggItem.java

package net.minecraft.world.item;

import com.google.common.collect.Maps;
import com.google.common.collect.Iterables;
import javax.annotation.Nullable;
import net.minecraft.nbt.CompoundTag;
import net.minecraft.stats.Stat;
import net.minecraft.stats.Stats;
import net.minecraft.world.level.block.LiquidBlock;
import net.minecraft.world.phys.BlockHitResult;
import net.minecraft.world.phys.HitResult;
import net.minecraft.world.level.ClipContext;
import net.minecraft.world.InteractionResultHolder;
import net.minecraft.world.InteractionHand;
import net.minecraft.world.entity.player.Player;
import net.minecraft.world.level.BaseSpawner;
import net.minecraft.world.level.block.entity.BlockEntity;
import net.minecraft.world.level.block.Block;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.core.BlockPos;
import net.minecraft.world.level.Level;
import net.minecraft.core.Direction;
import java.util.Objects;
import net.minecraft.world.entity.MobSpawnType;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.block.entity.SpawnerBlockEntity;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.InteractionResult;
import net.minecraft.world.entity.EntityType;
import java.util.Map;

public class SpawnEggItem extends Item {
    private static final Map<EntityType<?>, SpawnEggItem> BY_ID;
    private final int color1;
    private final int color2;
    private final EntityType<?> defaultType;
    
    public SpawnEggItem(final EntityType<?> akr, final int integer2, final int integer3, final Properties a) {
        super(a);
        this.defaultType = akr;
        this.color1 = integer2;
        this.color2 = integer3;
        SpawnEggItem.BY_ID.put(akr, this);
    }
    
    @Override
    public InteractionResult useOn(final UseOnContext bfw) {
        final Level bjt3 = bfw.getLevel();
        if (bjt3.isClientSide) {
            return InteractionResult.SUCCESS;
        }
        final ItemStack bek4 = bfw.getItemInHand();
        final BlockPos fk5 = bfw.getClickedPos();
        final Direction fp6 = bfw.getClickedFace();
        final BlockState byg7 = bjt3.getBlockState(fk5);
        final Block bpe8 = byg7.getBlock();
        if (bpe8 == Blocks.SPAWNER) {
            final BlockEntity bwi9 = bjt3.getBlockEntity(fk5);
            if (bwi9 instanceof SpawnerBlockEntity) {
                final BaseSpawner bja10 = ((SpawnerBlockEntity)bwi9).getSpawner();
                final EntityType<?> akr11 = this.getType(bek4.getTag());
                bja10.setEntityId(akr11);
                bwi9.setChanged();
                bjt3.sendBlockUpdated(fk5, byg7, byg7, 3);
                bek4.shrink(1);
                return InteractionResult.SUCCESS;
            }
        }
        BlockPos fk6;
        if (byg7.getCollisionShape(bjt3, fk5).isEmpty()) {
            fk6 = fk5;
        }
        else {
            fk6 = fk5.relative(fp6);
        }
        final EntityType<?> akr12 = this.getType(bek4.getTag());
        if (akr12.spawn(bjt3, bek4, bfw.getPlayer(), fk6, MobSpawnType.SPAWN_EGG, true, !Objects.equals(fk5, fk6) && fp6 == Direction.UP) != null) {
            bek4.shrink(1);
        }
        return InteractionResult.SUCCESS;
    }
    
    @Override
    public InteractionResultHolder<ItemStack> use(final Level bjt, final Player ayg, final InteractionHand ajh) {
        final ItemStack bek5 = ayg.getItemInHand(ajh);
        final HitResult cvf6 = Item.getPlayerPOVHitResult(bjt, ayg, ClipContext.Fluid.SOURCE_ONLY);
        if (cvf6.getType() != HitResult.Type.BLOCK) {
            return InteractionResultHolder.<ItemStack>pass(bek5);
        }
        if (bjt.isClientSide) {
            return InteractionResultHolder.<ItemStack>success(bek5);
        }
        final BlockHitResult cvd7 = (BlockHitResult)cvf6;
        final BlockPos fk8 = cvd7.getBlockPos();
        if (!(bjt.getBlockState(fk8).getBlock() instanceof LiquidBlock)) {
            return InteractionResultHolder.<ItemStack>pass(bek5);
        }
        if (!bjt.mayInteract(ayg, fk8) || !ayg.mayUseItemAt(fk8, cvd7.getDirection(), bek5)) {
            return InteractionResultHolder.<ItemStack>fail(bek5);
        }
        final EntityType<?> akr9 = this.getType(bek5.getTag());
        if (akr9.spawn(bjt, bek5, ayg, fk8, MobSpawnType.SPAWN_EGG, false, false) == null) {
            return InteractionResultHolder.<ItemStack>pass(bek5);
        }
        if (!ayg.abilities.instabuild) {
            bek5.shrink(1);
        }
        ayg.awardStat(Stats.ITEM_USED.get(this));
        return InteractionResultHolder.<ItemStack>success(bek5);
    }
    
    public boolean spawnsEntity(@Nullable final CompoundTag jt, final EntityType<?> akr) {
        return Objects.equals(this.getType(jt), akr);
    }
    
    public int getColor(final int integer) {
        return (integer == 0) ? this.color1 : this.color2;
    }
    
    @Nullable
    public static SpawnEggItem byId(@Nullable final EntityType<?> akr) {
        return SpawnEggItem.BY_ID.get(akr);
    }
    
    public static Iterable<SpawnEggItem> eggs() {
        return Iterables.<SpawnEggItem>unmodifiableIterable(SpawnEggItem.BY_ID.values());
    }
    
    public EntityType<?> getType(@Nullable final CompoundTag jt) {
        if (jt != null && jt.contains("EntityTag", 10)) {
            final CompoundTag jt2 = jt.getCompound("EntityTag");
            if (jt2.contains("id", 8)) {
                return EntityType.byString(jt2.getString("id")).orElse(this.defaultType);
            }
        }
        return this.defaultType;
    }
    
    static {
        BY_ID = Maps.newIdentityHashMap();
    }
}