package net.minecraft.world.level.block; import com.google.common.cache.CacheBuilder; import com.google.common.cache.CacheLoader; import com.google.common.cache.LoadingCache; import com.google.common.collect.ImmutableMap; import com.mojang.logging.LogUtils; import com.mojang.serialization.MapCodec; import it.unimi.dsi.fastutil.objects.Object2ByteLinkedOpenHashMap; import java.util.Arrays; import java.util.List; import java.util.Map; import java.util.Map.Entry; import java.util.function.Function; import java.util.function.IntFunction; import java.util.function.Supplier; import java.util.stream.Collectors; import java.util.stream.IntStream; import javax.annotation.Nullable; import net.minecraft.SharedConstants; import net.minecraft.core.BlockPos; import net.minecraft.core.Direction; import net.minecraft.core.Holder; import net.minecraft.core.IdMapper; import net.minecraft.core.registries.BuiltInRegistries; import net.minecraft.network.chat.Component; import net.minecraft.network.chat.MutableComponent; import net.minecraft.server.level.ServerLevel; import net.minecraft.stats.Stats; import net.minecraft.tags.BlockTags; import net.minecraft.util.Mth; import net.minecraft.util.RandomSource; import net.minecraft.util.valueproviders.IntProvider; import net.minecraft.world.entity.Entity; import net.minecraft.world.entity.EntityType; import net.minecraft.world.entity.ExperienceOrb; import net.minecraft.world.entity.LivingEntity; import net.minecraft.world.entity.item.ItemEntity; import net.minecraft.world.entity.monster.piglin.PiglinAi; import net.minecraft.world.entity.player.Player; import net.minecraft.world.item.BlockItem; import net.minecraft.world.item.Item; import net.minecraft.world.item.ItemStack; import net.minecraft.world.item.context.BlockPlaceContext; import net.minecraft.world.item.enchantment.EnchantmentHelper; import net.minecraft.world.level.BlockGetter; import net.minecraft.world.level.Explosion; import net.minecraft.world.level.GameRules; import net.minecraft.world.level.ItemLike; import net.minecraft.world.level.Level; import net.minecraft.world.level.LevelAccessor; import net.minecraft.world.level.LevelReader; import net.minecraft.world.level.biome.Biome; import net.minecraft.world.level.block.entity.BlockEntity; import net.minecraft.world.level.block.state.BlockBehaviour; import net.minecraft.world.level.block.state.BlockState; import net.minecraft.world.level.block.state.StateDefinition; import net.minecraft.world.level.block.state.StateHolder; import net.minecraft.world.level.block.state.properties.Property; import net.minecraft.world.level.gameevent.GameEvent; import net.minecraft.world.level.storage.loot.LootParams; import net.minecraft.world.level.storage.loot.parameters.LootContextParams; import net.minecraft.world.phys.Vec3; import net.minecraft.world.phys.shapes.BooleanOp; import net.minecraft.world.phys.shapes.Shapes; import net.minecraft.world.phys.shapes.VoxelShape; import org.slf4j.Logger; public class Block extends BlockBehaviour implements ItemLike { public static final MapCodec CODEC = simpleCodec(Block::new); private static final Logger LOGGER = LogUtils.getLogger(); private final Holder.Reference builtInRegistryHolder = BuiltInRegistries.BLOCK.createIntrusiveHolder(this); public static final IdMapper BLOCK_STATE_REGISTRY = new IdMapper<>(); private static final LoadingCache SHAPE_FULL_BLOCK_CACHE = CacheBuilder.newBuilder() .maximumSize(512L) .weakKeys() .build(new CacheLoader() { public Boolean load(VoxelShape p_49972_) { return !Shapes.joinIsNotEmpty(Shapes.block(), p_49972_, BooleanOp.NOT_SAME); } }); public static final int UPDATE_NEIGHBORS = 1; public static final int UPDATE_CLIENTS = 2; public static final int UPDATE_INVISIBLE = 4; public static final int UPDATE_IMMEDIATE = 8; public static final int UPDATE_KNOWN_SHAPE = 16; public static final int UPDATE_SUPPRESS_DROPS = 32; public static final int UPDATE_MOVE_BY_PISTON = 64; public static final int UPDATE_SKIP_SHAPE_UPDATE_ON_WIRE = 128; public static final int UPDATE_SKIP_BLOCK_ENTITY_SIDEEFFECTS = 256; public static final int UPDATE_SKIP_ON_PLACE = 512; public static final int UPDATE_NONE = 260; public static final int UPDATE_ALL = 3; public static final int UPDATE_ALL_IMMEDIATE = 11; public static final int UPDATE_SKIP_ALL_SIDEEFFECTS = 816; public static final float INDESTRUCTIBLE = -1.0F; public static final float INSTANT = 0.0F; public static final int UPDATE_LIMIT = 512; protected final StateDefinition stateDefinition; private BlockState defaultBlockState; @Nullable private Item item; private static final int CACHE_SIZE = 256; private static final ThreadLocal> OCCLUSION_CACHE = ThreadLocal.withInitial(() -> { Object2ByteLinkedOpenHashMap object2bytelinkedopenhashmap = new Object2ByteLinkedOpenHashMap(256, 0.25F) { @Override protected void rehash(int p_49979_) { } }; object2bytelinkedopenhashmap.defaultReturnValue((byte)127); return object2bytelinkedopenhashmap; }); @Override protected MapCodec codec() { return CODEC; } public static int getId(@Nullable BlockState p_49957_) { if (p_49957_ == null) { return 0; } else { int i = BLOCK_STATE_REGISTRY.getId(p_49957_); return i == -1 ? 0 : i; } } public static BlockState stateById(int p_49804_) { BlockState blockstate = BLOCK_STATE_REGISTRY.byId(p_49804_); return blockstate == null ? Blocks.AIR.defaultBlockState() : blockstate; } public static Block byItem(@Nullable Item p_49815_) { return p_49815_ instanceof BlockItem ? ((BlockItem)p_49815_).getBlock() : Blocks.AIR; } public static BlockState pushEntitiesUp(BlockState p_49898_, BlockState p_49899_, LevelAccessor p_238252_, BlockPos p_49901_) { VoxelShape voxelshape = Shapes.joinUnoptimized(p_49898_.getCollisionShape(p_238252_, p_49901_), p_49899_.getCollisionShape(p_238252_, p_49901_), BooleanOp.ONLY_SECOND) .move(p_49901_); if (voxelshape.isEmpty()) { return p_49899_; } else { for (Entity entity : p_238252_.getEntities(null, voxelshape.bounds())) { double d0 = Shapes.collide(Direction.Axis.Y, entity.getBoundingBox().move(0.0, 1.0, 0.0), List.of(voxelshape), -1.0); entity.teleportRelative(0.0, 1.0 + d0, 0.0); } return p_49899_; } } public static VoxelShape box(double p_49797_, double p_49798_, double p_49799_, double p_49800_, double p_49801_, double p_49802_) { return Shapes.box(p_49797_ / 16.0, p_49798_ / 16.0, p_49799_ / 16.0, p_49800_ / 16.0, p_49801_ / 16.0, p_49802_ / 16.0); } public static VoxelShape[] boxes(int p_394659_, IntFunction p_396964_) { return IntStream.rangeClosed(0, p_394659_).mapToObj(p_396964_).toArray(VoxelShape[]::new); } public static VoxelShape cube(double p_397240_) { return cube(p_397240_, p_397240_, p_397240_); } public static VoxelShape cube(double p_392676_, double p_397245_, double p_392114_) { double d0 = p_397245_ / 2.0; return column(p_392676_, p_392114_, 8.0 - d0, 8.0 + d0); } public static VoxelShape column(double p_392765_, double p_395995_, double p_395266_) { return column(p_392765_, p_392765_, p_395995_, p_395266_); } public static VoxelShape column(double p_391575_, double p_395994_, double p_393149_, double p_395899_) { double d0 = p_391575_ / 2.0; double d1 = p_395994_ / 2.0; return box(8.0 - d0, p_393149_, 8.0 - d1, 8.0 + d0, p_395899_, 8.0 + d1); } public static VoxelShape boxZ(double p_396620_, double p_393157_, double p_396151_) { return boxZ(p_396620_, p_396620_, p_393157_, p_396151_); } public static VoxelShape boxZ(double p_397878_, double p_397911_, double p_395144_, double p_396997_) { double d0 = p_397911_ / 2.0; return boxZ(p_397878_, 8.0 - d0, 8.0 + d0, p_395144_, p_396997_); } public static VoxelShape boxZ(double p_392239_, double p_394276_, double p_393192_, double p_393113_, double p_394147_) { double d0 = p_392239_ / 2.0; return box(8.0 - d0, p_394276_, p_393113_, 8.0 + d0, p_393192_, p_394147_); } public static BlockState updateFromNeighbourShapes(BlockState p_49932_, LevelAccessor p_49933_, BlockPos p_49934_) { BlockState blockstate = p_49932_; BlockPos.MutableBlockPos blockpos$mutableblockpos = new BlockPos.MutableBlockPos(); for (Direction direction : UPDATE_SHAPE_ORDER) { blockpos$mutableblockpos.setWithOffset(p_49934_, direction); blockstate = blockstate.updateShape( p_49933_, p_49933_, p_49934_, direction, blockpos$mutableblockpos, p_49933_.getBlockState(blockpos$mutableblockpos), p_49933_.getRandom() ); } return blockstate; } public static void updateOrDestroy(BlockState p_49903_, BlockState p_49904_, LevelAccessor p_49905_, BlockPos p_49906_, int p_49907_) { updateOrDestroy(p_49903_, p_49904_, p_49905_, p_49906_, p_49907_, 512); } public static void updateOrDestroy(BlockState p_49909_, BlockState p_49910_, LevelAccessor p_49911_, BlockPos p_49912_, int p_49913_, int p_49914_) { if (p_49910_ != p_49909_) { if (p_49910_.isAir()) { if (!p_49911_.isClientSide()) { p_49911_.destroyBlock(p_49912_, (p_49913_ & 32) == 0, null, p_49914_); } } else { p_49911_.setBlock(p_49912_, p_49910_, p_49913_ & -33, p_49914_); } } } public Block(BlockBehaviour.Properties p_49795_) { super(p_49795_); StateDefinition.Builder builder = new StateDefinition.Builder<>(this); this.createBlockStateDefinition(builder); this.stateDefinition = builder.create(Block::defaultBlockState, BlockState::new); this.registerDefaultState(this.stateDefinition.any()); if (SharedConstants.IS_RUNNING_IN_IDE) { String s = this.getClass().getSimpleName(); if (!s.endsWith("Block")) { LOGGER.error("Block classes should end with Block and {} doesn't.", s); } } } public static boolean isExceptionForConnection(BlockState p_152464_) { return p_152464_.getBlock() instanceof LeavesBlock || p_152464_.is(Blocks.BARRIER) || p_152464_.is(Blocks.CARVED_PUMPKIN) || p_152464_.is(Blocks.JACK_O_LANTERN) || p_152464_.is(Blocks.MELON) || p_152464_.is(Blocks.PUMPKIN) || p_152464_.is(BlockTags.SHULKER_BOXES); } public static boolean shouldRenderFace(BlockState p_152445_, BlockState p_362730_, Direction p_152448_) { VoxelShape voxelshape = p_362730_.getFaceOcclusionShape(p_152448_.getOpposite()); if (voxelshape == Shapes.block()) { return false; } else if (p_152445_.skipRendering(p_362730_, p_152448_)) { return false; } else if (voxelshape == Shapes.empty()) { return true; } else { VoxelShape voxelshape1 = p_152445_.getFaceOcclusionShape(p_152448_); if (voxelshape1 == Shapes.empty()) { return true; } else { Block.ShapePairKey block$shapepairkey = new Block.ShapePairKey(voxelshape1, voxelshape); Object2ByteLinkedOpenHashMap object2bytelinkedopenhashmap = OCCLUSION_CACHE.get(); byte b0 = object2bytelinkedopenhashmap.getAndMoveToFirst(block$shapepairkey); if (b0 != 127) { return b0 != 0; } else { boolean flag = Shapes.joinIsNotEmpty(voxelshape1, voxelshape, BooleanOp.ONLY_FIRST); if (object2bytelinkedopenhashmap.size() == 256) { object2bytelinkedopenhashmap.removeLastByte(); } object2bytelinkedopenhashmap.putAndMoveToFirst(block$shapepairkey, (byte)(flag ? 1 : 0)); return flag; } } } } public static boolean canSupportRigidBlock(BlockGetter p_49937_, BlockPos p_49938_) { return p_49937_.getBlockState(p_49938_).isFaceSturdy(p_49937_, p_49938_, Direction.UP, SupportType.RIGID); } public static boolean canSupportCenter(LevelReader p_49864_, BlockPos p_49865_, Direction p_49866_) { BlockState blockstate = p_49864_.getBlockState(p_49865_); return p_49866_ == Direction.DOWN && blockstate.is(BlockTags.UNSTABLE_BOTTOM_CENTER) ? false : blockstate.isFaceSturdy(p_49864_, p_49865_, p_49866_, SupportType.CENTER); } public static boolean isFaceFull(VoxelShape p_49919_, Direction p_49920_) { VoxelShape voxelshape = p_49919_.getFaceShape(p_49920_); return isShapeFullBlock(voxelshape); } public static boolean isShapeFullBlock(VoxelShape p_49917_) { return SHAPE_FULL_BLOCK_CACHE.getUnchecked(p_49917_); } public void animateTick(BlockState p_220827_, Level p_220828_, BlockPos p_220829_, RandomSource p_220830_) { } public void destroy(LevelAccessor p_49860_, BlockPos p_49861_, BlockState p_49862_) { } public static List getDrops(BlockState p_49870_, ServerLevel p_49871_, BlockPos p_49872_, @Nullable BlockEntity p_49873_) { LootParams.Builder lootparams$builder = new LootParams.Builder(p_49871_) .withParameter(LootContextParams.ORIGIN, Vec3.atCenterOf(p_49872_)) .withParameter(LootContextParams.TOOL, ItemStack.EMPTY) .withOptionalParameter(LootContextParams.BLOCK_ENTITY, p_49873_); return p_49870_.getDrops(lootparams$builder); } public static List getDrops( BlockState p_49875_, ServerLevel p_49876_, BlockPos p_49877_, @Nullable BlockEntity p_49878_, @Nullable Entity p_49879_, ItemStack p_49880_ ) { LootParams.Builder lootparams$builder = new LootParams.Builder(p_49876_) .withParameter(LootContextParams.ORIGIN, Vec3.atCenterOf(p_49877_)) .withParameter(LootContextParams.TOOL, p_49880_) .withOptionalParameter(LootContextParams.THIS_ENTITY, p_49879_) .withOptionalParameter(LootContextParams.BLOCK_ENTITY, p_49878_); return p_49875_.getDrops(lootparams$builder); } public static void dropResources(BlockState p_49951_, Level p_49952_, BlockPos p_49953_) { if (p_49952_ instanceof ServerLevel) { getDrops(p_49951_, (ServerLevel)p_49952_, p_49953_, null).forEach(p_152406_ -> popResource(p_49952_, p_49953_, p_152406_)); p_49951_.spawnAfterBreak((ServerLevel)p_49952_, p_49953_, ItemStack.EMPTY, true); } } public static void dropResources(BlockState p_49893_, LevelAccessor p_49894_, BlockPos p_49895_, @Nullable BlockEntity p_49896_) { if (p_49894_ instanceof ServerLevel) { getDrops(p_49893_, (ServerLevel)p_49894_, p_49895_, p_49896_).forEach(p_49859_ -> popResource((ServerLevel)p_49894_, p_49895_, p_49859_)); p_49893_.spawnAfterBreak((ServerLevel)p_49894_, p_49895_, ItemStack.EMPTY, true); } } public static void dropResources( BlockState p_49882_, Level p_49883_, BlockPos p_49884_, @Nullable BlockEntity p_49885_, @Nullable Entity p_49886_, ItemStack p_49887_ ) { if (p_49883_ instanceof ServerLevel) { getDrops(p_49882_, (ServerLevel)p_49883_, p_49884_, p_49885_, p_49886_, p_49887_).forEach(p_49944_ -> popResource(p_49883_, p_49884_, p_49944_)); p_49882_.spawnAfterBreak((ServerLevel)p_49883_, p_49884_, p_49887_, true); } } public static void popResource(Level p_49841_, BlockPos p_49842_, ItemStack p_49843_) { double d0 = EntityType.ITEM.getHeight() / 2.0; double d1 = p_49842_.getX() + 0.5 + Mth.nextDouble(p_49841_.random, -0.25, 0.25); double d2 = p_49842_.getY() + 0.5 + Mth.nextDouble(p_49841_.random, -0.25, 0.25) - d0; double d3 = p_49842_.getZ() + 0.5 + Mth.nextDouble(p_49841_.random, -0.25, 0.25); popResource(p_49841_, () -> new ItemEntity(p_49841_, d1, d2, d3, p_49843_), p_49843_); } public static void popResourceFromFace(Level p_152436_, BlockPos p_152437_, Direction p_152438_, ItemStack p_152439_) { int i = p_152438_.getStepX(); int j = p_152438_.getStepY(); int k = p_152438_.getStepZ(); double d0 = EntityType.ITEM.getWidth() / 2.0; double d1 = EntityType.ITEM.getHeight() / 2.0; double d2 = p_152437_.getX() + 0.5 + (i == 0 ? Mth.nextDouble(p_152436_.random, -0.25, 0.25) : i * (0.5 + d0)); double d3 = p_152437_.getY() + 0.5 + (j == 0 ? Mth.nextDouble(p_152436_.random, -0.25, 0.25) : j * (0.5 + d1)) - d1; double d4 = p_152437_.getZ() + 0.5 + (k == 0 ? Mth.nextDouble(p_152436_.random, -0.25, 0.25) : k * (0.5 + d0)); double d5 = i == 0 ? Mth.nextDouble(p_152436_.random, -0.1, 0.1) : i * 0.1; double d6 = j == 0 ? Mth.nextDouble(p_152436_.random, 0.0, 0.1) : j * 0.1 + 0.1; double d7 = k == 0 ? Mth.nextDouble(p_152436_.random, -0.1, 0.1) : k * 0.1; popResource(p_152436_, () -> new ItemEntity(p_152436_, d2, d3, d4, p_152439_, d5, d6, d7), p_152439_); } private static void popResource(Level p_152441_, Supplier p_152442_, ItemStack p_152443_) { if (p_152441_ instanceof ServerLevel serverlevel && !p_152443_.isEmpty() && serverlevel.getGameRules().getBoolean(GameRules.RULE_DOBLOCKDROPS)) { ItemEntity itementity = p_152442_.get(); itementity.setDefaultPickUpDelay(); p_152441_.addFreshEntity(itementity); } } protected void popExperience(ServerLevel p_49806_, BlockPos p_49807_, int p_49808_) { if (p_49806_.getGameRules().getBoolean(GameRules.RULE_DOBLOCKDROPS)) { ExperienceOrb.award(p_49806_, Vec3.atCenterOf(p_49807_), p_49808_); } } public float getExplosionResistance() { return this.explosionResistance; } public void wasExploded(ServerLevel p_361938_, BlockPos p_49845_, Explosion p_49846_) { } public void stepOn(Level p_152431_, BlockPos p_152432_, BlockState p_152433_, Entity p_152434_) { } @Nullable public BlockState getStateForPlacement(BlockPlaceContext p_49820_) { return this.defaultBlockState(); } public void playerDestroy(Level p_49827_, Player p_49828_, BlockPos p_49829_, BlockState p_49830_, @Nullable BlockEntity p_49831_, ItemStack p_49832_) { p_49828_.awardStat(Stats.BLOCK_MINED.get(this)); p_49828_.causeFoodExhaustion(0.005F); dropResources(p_49830_, p_49827_, p_49829_, p_49831_, p_49828_, p_49832_); } public void setPlacedBy(Level p_49847_, BlockPos p_49848_, BlockState p_49849_, @Nullable LivingEntity p_49850_, ItemStack p_49851_) { } public boolean isPossibleToRespawnInThis(BlockState p_279289_) { return !p_279289_.isSolid() && !p_279289_.liquid(); } public MutableComponent getName() { return Component.translatable(this.getDescriptionId()); } public void fallOn(Level p_152426_, BlockState p_152427_, BlockPos p_152428_, Entity p_152429_, double p_396576_) { p_152429_.causeFallDamage(p_396576_, 1.0F, p_152429_.damageSources().fall()); } public void updateEntityMovementAfterFallOn(BlockGetter p_49821_, Entity p_49822_) { p_49822_.setDeltaMovement(p_49822_.getDeltaMovement().multiply(1.0, 0.0, 1.0)); } public float getFriction() { return this.friction; } public float getSpeedFactor() { return this.speedFactor; } public float getJumpFactor() { return this.jumpFactor; } protected void spawnDestroyParticles(Level p_152422_, Player p_152423_, BlockPos p_152424_, BlockState p_152425_) { p_152422_.levelEvent(p_152423_, 2001, p_152424_, getId(p_152425_)); } public BlockState playerWillDestroy(Level p_49852_, BlockPos p_49853_, BlockState p_49854_, Player p_49855_) { this.spawnDestroyParticles(p_49852_, p_49855_, p_49853_, p_49854_); if (p_49854_.is(BlockTags.GUARDED_BY_PIGLINS) && p_49852_ instanceof ServerLevel serverlevel) { PiglinAi.angerNearbyPiglins(serverlevel, p_49855_, false); } p_49852_.gameEvent(GameEvent.BLOCK_DESTROY, p_49853_, GameEvent.Context.of(p_49855_, p_49854_)); return p_49854_; } public void handlePrecipitation(BlockState p_152450_, Level p_152451_, BlockPos p_152452_, Biome.Precipitation p_152453_) { } public boolean dropFromExplosion(Explosion p_49826_) { return true; } protected void createBlockStateDefinition(StateDefinition.Builder p_49915_) { } public StateDefinition getStateDefinition() { return this.stateDefinition; } protected final void registerDefaultState(BlockState p_49960_) { this.defaultBlockState = p_49960_; } public final BlockState defaultBlockState() { return this.defaultBlockState; } public final BlockState withPropertiesOf(BlockState p_152466_) { BlockState blockstate = this.defaultBlockState(); for (Property property : p_152466_.getBlock().getStateDefinition().getProperties()) { if (blockstate.hasProperty(property)) { blockstate = copyProperty(p_152466_, blockstate, property); } } return blockstate; } private static > BlockState copyProperty(BlockState p_152455_, BlockState p_152456_, Property p_152457_) { return p_152456_.setValue(p_152457_, p_152455_.getValue(p_152457_)); } @Override public Item asItem() { if (this.item == null) { this.item = Item.byBlock(this); } return this.item; } public boolean hasDynamicShape() { return this.dynamicShape; } @Override public String toString() { return "Block{" + BuiltInRegistries.BLOCK.wrapAsHolder(this).getRegisteredName() + "}"; } @Override protected Block asBlock() { return this; } protected Function getShapeForEachState(Function p_391219_) { return this.stateDefinition.getPossibleStates().stream().collect(ImmutableMap.toImmutableMap(Function.identity(), p_391219_))::get; } protected Function getShapeForEachState(Function p_152459_, Property... p_395474_) { Map, Object> map = Arrays.stream(p_395474_) .collect(Collectors.toMap(p_390903_ -> p_390903_, p_390899_ -> p_390899_.getPossibleValues().getFirst())); ImmutableMap immutablemap = this.stateDefinition .getPossibleStates() .stream() .filter(p_390902_ -> map.entrySet().stream().allMatch(p_390905_ -> p_390902_.getValue((Property)p_390905_.getKey()) == p_390905_.getValue())) .collect(ImmutableMap.toImmutableMap(Function.identity(), p_152459_)); return p_390898_ -> { for (Entry, Object> entry : map.entrySet()) { p_390898_ = setValueHelper(p_390898_, (Property)entry.getKey(), entry.getValue()); } return immutablemap.get(p_390898_); }; } private static , T extends Comparable> S setValueHelper(S p_392443_, Property p_392291_, Object p_395700_) { return p_392443_.setValue(p_392291_, (T)p_395700_); } @Deprecated public Holder.Reference builtInRegistryHolder() { return this.builtInRegistryHolder; } protected void tryDropExperience(ServerLevel p_220823_, BlockPos p_220824_, ItemStack p_220825_, IntProvider p_220826_) { int i = EnchantmentHelper.processBlockExperience(p_220823_, p_220825_, p_220826_.sample(p_220823_.getRandom())); if (i > 0) { this.popExperience(p_220823_, p_220824_, i); } } record ShapePairKey(VoxelShape first, VoxelShape second) { @Override public boolean equals(Object p_363342_) { return p_363342_ instanceof Block.ShapePairKey block$shapepairkey && this.first == block$shapepairkey.first && this.second == block$shapepairkey.second; } @Override public int hashCode() { return System.identityHashCode(this.first) * 31 + System.identityHashCode(this.second); } } }