Package cn.nukkit.entity.mob

Class EntityCreeper

java.lang.Object

cn.nukkit.math.Vector3

cn.nukkit.positiontracking.NamedPosition

cn.nukkit.level.Position

cn.nukkit.level.Location

cn.nukkit.entity.Entity

cn.nukkit.entity.EntityLiving

cn.nukkit.entity.EntityCreature

cn.nukkit.entity.EntityPhysical

cn.nukkit.entity.EntityIntelligent

cn.nukkit.entity.mob.EntityMob

cn.nukkit.entity.mob.EntityWalkingMob

cn.nukkit.entity.mob.EntityCreeper

All Implemented Interfaces:

EntityAsyncPrepare, EntityDamageable, EntityInteractable, EntityNameable, EntityInventoryHolder, InventoryHolder, Metadatable, Cloneable

public class EntityCreeper
extends EntityWalkingMob
implements EntityInteractable

Author:

Box.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	DATA_POWERED
static final int	DATA_SWELL
static final int	DATA_SWELL_DIRECTION
static final int	DATA_SWELL_OLD
static final int	NETWORK_ID

Fields inherited from class cn.nukkit.entity.EntityIntelligent

EMPTY_BEHAVIOR_GROUP, enablePitch, isActive, lookTarget, moveDirectionEnd, moveDirectionStart, moveTarget, needUpdateMoveDirection

Fields inherited from class cn.nukkit.entity.EntityPhysical

fallingTick, globalCycleTickSpread, needsRecalcMovement, offsetBoundingBox, PRECISION, previousCollideMotion, previousCurrentMotion, tickSpread

Fields inherited from class cn.nukkit.entity.EntityLiving

attackTime, invisible, movementSpeed, turtleTicks

Fields inherited from class cn.nukkit.entity.Entity

absorption, age, blocksAround, boundingBox, chunk, closed, collisionBlocks, DATA_AERIAL_ATTACK, DATA_AGENT, DATA_AIR, DATA_ALWAYS_SHOW_NAMETAG, DATA_AMBIENT_SOUND_EVENT_NAME, DATA_AMBIENT_SOUND_INTERVAL, DATA_AMBIENT_SOUND_INTERVAL_RANGE, DATA_AREA_EFFECT_CLOUD_PARTICLE_ID, DATA_AREA_EFFECT_CLOUD_RADIUS, DATA_AREA_EFFECT_CLOUD_WAITING, DATA_ARMOR_STAND_POSE_INDEX, DATA_AUX_POWER, DATA_BALLOON_ATTACHED_ENTITY, DATA_BASE_RUNTIME_ID, DATA_BLOCK_TARGET, DATA_BOUNDING_BOX_HEIGHT, DATA_BOUNDING_BOX_WIDTH, DATA_BUBBLE_TIME, DATA_BUOYANCY_DATA, DATA_CAN_RIDE_TARGET, DATA_CHANGE_ON_PICKUP, DATA_CHANGE_RATE, DATA_CHARGE_AMOUNT, DATA_CLIENT_EVENT, DATA_COLOR, DATA_COLOR_2, DATA_COLOUR, DATA_COMMAND_BLOCK_COMMAND, DATA_COMMAND_BLOCK_EXECUTE_ON_FIRST_TICK, DATA_COMMAND_BLOCK_LAST_OUTPUT, DATA_COMMAND_BLOCK_TICK_DELAY, DATA_COMMAND_BLOCK_TRACK_OUTPUT, DATA_CONTAINER_BASE_SIZE, DATA_CONTAINER_EXTRA_SLOTS_PER_STRENGTH, DATA_CONTAINER_TYPE, DATA_CONTROLLING_RIDER_SEAT_NUMBER, DATA_DISPLAY_ITEM, DATA_DISPLAY_OFFSET, DATA_DURATION, DATA_EATING_COUNTER, DATA_ENDER_CRYSTAL_TIME_OFFSET, DATA_ENDERMAN_HELD_RUNTIME_ID, DATA_ENTITY_AGE, DATA_EXPERIENCE_VALUE, DATA_FALL_DAMAGE_MULTIPLIER, DATA_FIREBALL_POWER_X, DATA_FIREBALL_POWER_Y, DATA_FIREBALL_POWER_Z, DATA_FISH_ANGLE, DATA_FISH_X, DATA_FISH_Z, DATA_FLAG_ACTION, DATA_FLAG_ADMIRING, DATA_FLAG_ALWAYS_SHOW_NAMETAG, DATA_FLAG_ANGRY, DATA_FLAG_BABY, DATA_FLAG_BLOCKED_USING_DAMAGED_SHIELD, DATA_FLAG_BLOCKED_USING_SHIELD, DATA_FLAG_BLOCKING, DATA_FLAG_BREAKING_OBSTRUCTION, DATA_FLAG_BREATHING, DATA_FLAG_BRIBED, DATA_FLAG_CAN_CLIMB, DATA_FLAG_CAN_FLY, DATA_FLAG_CAN_POWER_JUMP, DATA_FLAG_CAN_SHOW_NAMETAG, DATA_FLAG_CELEBRATING, DATA_FLAG_CELEBRATING_SPECIAL, DATA_FLAG_CHARGE_ATTACK, DATA_FLAG_CHARGED, DATA_FLAG_CHESTED, DATA_FLAG_CONTAINER_PRIVATE, DATA_FLAG_CONVERTING, DATA_FLAG_CRITICAL, DATA_FLAG_CROAKING, DATA_FLAG_DANCING, DATA_FLAG_DELAYED_ATTACK, DATA_FLAG_DIGGING, DATA_FLAG_DOOR_BREAKER, DATA_FLAG_DOOR_OPENER, DATA_FLAG_EAT_MOB, DATA_FLAG_EATING, DATA_FLAG_ELDER, DATA_FLAG_EMERGING, DATA_FLAG_EMOTING, DATA_FLAG_ENCHANTED, DATA_FLAG_ENTITY_GROW_UP, DATA_FLAG_EVOKER_SPELL, DATA_FLAG_FACING_TARGET_TO_RANGE_ATTACK, DATA_FLAG_FALL_THROUGH_SCAFFOLDING, DATA_FLAG_FIRE_IMMUNE, DATA_FLAG_GLIDING, DATA_FLAG_GRAVITY, DATA_FLAG_HAS_COLLISION, DATA_FLAG_HIDDEN_WHEN_INVISIBLE, DATA_FLAG_IDLING, DATA_FLAG_IGNITED, DATA_FLAG_IMMOBILE, DATA_FLAG_IN_ASCENDABLE_BLOCK, DATA_FLAG_IN_SCAFFOLDING, DATA_FLAG_INLOVE, DATA_FLAG_INTERESTED, DATA_FLAG_INVISIBLE, DATA_FLAG_IS_AVOIDING_BLOCKS, DATA_FLAG_IS_AVOIDING_MOBS, DATA_FLAG_IS_ILLAGER_CAPTAIN, DATA_FLAG_IS_IN_UI, DATA_FLAG_IS_TRANSFORMING, DATA_FLAG_JUMP_GOAL_JUMP, DATA_FLAG_LAYING_DOWN, DATA_FLAG_LAYING_EGG, DATA_FLAG_LEASHED, DATA_FLAG_LINGER, DATA_FLAG_MOVING, DATA_FLAG_NO_AI, DATA_FLAG_ONFIRE, DATA_FLAG_ORPHANED, DATA_FLAG_OVER_DESCENDABLE_BLOCK, DATA_FLAG_OVER_SCAFFOLDING, DATA_FLAG_PLAYING_DEAD, DATA_FLAG_POWERED, DATA_FLAG_PREGNANT, DATA_FLAG_RAM_ATTACK, DATA_FLAG_REARING, DATA_FLAG_RESTING, DATA_FLAG_RIDER_CAN_PICK, DATA_FLAG_RIDING, DATA_FLAG_ROARING, DATA_FLAG_ROLLING, DATA_FLAG_SADDLED, DATA_FLAG_SCARED, DATA_FLAG_SHEARED, DATA_FLAG_SHOW_TRIDENT_ROPE, DATA_FLAG_SHOWBASE, DATA_FLAG_SILENT, DATA_FLAG_SITTING, DATA_FLAG_SLEEPING, DATA_FLAG_SNEAKING, DATA_FLAG_SNEEZING, DATA_FLAG_SNIFFING, DATA_FLAG_SPIN_ATTACK, DATA_FLAG_SPRINTING, DATA_FLAG_STACKABLE, DATA_FLAG_STALKING, DATA_FLAG_STUNNED, DATA_FLAG_SWIMMER, DATA_FLAG_SWIMMING, DATA_FLAG_TAMED, DATA_FLAG_TEMPTED, DATA_FLAG_TRADE_INTEREST, DATA_FLAG_TRANSITION_BLOCKING, DATA_FLAG_TRANSITION_SETTING, DATA_FLAG_TRANSITION_SITTING, DATA_FLAG_TRUSTING, DATA_FLAG_VIBRATING, DATA_FLAG_WALKER, DATA_FLAG_WALLCLIMBING, DATA_FLAG_WASD_CONTROLLED, DATA_FLAGS, DATA_FLAGS_EXTENDED, DATA_FREEZING_EFFECT_STRENGTH, DATA_FUSE_LENGTH, DATA_GOAT_HORN_COUNT, DATA_HAS_COMMAND_BLOCK, DATA_HAS_DISPLAY, DATA_HAS_NPC_COMPONENT, DATA_HEALTH, DATA_HEARTBEAT_INTERVAL_TICKS, DATA_HEARTBEAT_SOUND_EVENT, DATA_HIGH_TIER_CURED_DISCOUNT, DATA_HITBOX, DATA_HURT_DIRECTION, DATA_HURT_TIME, DATA_INTERACT_TEXT, DATA_INTERACTIVE_TAG, DATA_IS_BUOYANT, DATA_JUMP_DURATION, DATA_LAYING_AMOUNT, DATA_LAYING_AMOUNT_PREVIOUS, DATA_LEAD_HOLDER_EID, DATA_LIMITED_LIFE, DATA_LOW_TIER_CURED_DISCOUNT, DATA_MARK_VARIANT, DATA_MAX_AIR, DATA_MAX_STRENGTH, DATA_MAX_TRADE_TIER, DATA_MOVEMENT_SOUND_DISTANCE_OFFSET, DATA_NAME_AUTHOR, DATA_NAME_RAW_TEXT, DATA_NAMETAG, DATA_NEARBY_CURED_DISCOUNT, DATA_NEARBY_CURED_DISCOUNT_TIMESTAMP, DATA_NPC_ACTIONS, DATA_NPC_SKIN_DATA, DATA_OLD_SWELL, DATA_OWNER_EID, DATA_PADDLE_TIME_LEFT, DATA_PADDLE_TIME_RIGHT, DATA_PICKUP_COUNT, DATA_PLAYER_BED_POSITION, DATA_PLAYER_FLAGS, DATA_PLAYER_INDEX, DATA_POTION_AMBIENT, DATA_POTION_AUX_VALUE, DATA_POTION_COLOR, DATA_PUFFERFISH_SIZE, DATA_RIDER_MAX_ROTATION, DATA_RIDER_MIN_ROTATION, DATA_RIDER_ROTATION_LOCKED, DATA_RIDER_ROTATION_OFFSET, DATA_RIDER_SEAT_POSITION, DATA_SCALE, DATA_SCORE_TAG, DATA_SHULKER_ATTACH_FACE, DATA_SHULKER_ATTACH_POS, DATA_SHULKER_ATTACHED, DATA_SHULKER_PEEK_ID, DATA_SITTING_AMOUNT, DATA_SITTING_AMOUNT_PREVIOUS, DATA_SKIN_ID, DATA_SPAWN_TIME, DATA_SPAWNING_FRAMES, DATA_SPELL_CASTING_COLOR, DATA_STRENGTH, DATA_SWELL_DIR, DATA_TARGET_EID, DATA_TRADE_EXPERIENCE, DATA_TRADE_TIER, DATA_TRADING_CAREER, DATA_TRADING_PLAYER_EID, DATA_TYPE_BYTE, DATA_TYPE_FLOAT, DATA_TYPE_INT, DATA_TYPE_LONG, DATA_TYPE_NBT, DATA_TYPE_POS, DATA_TYPE_SHORT, DATA_TYPE_STRING, DATA_TYPE_VECTOR3F, DATA_UPDATE_PROPERTIES, DATA_USING_ITEM, DATA_VARIANT, DATA_WITHER_INVULNERABLE_TICKS, DATA_WITHER_TARGET_1, DATA_WITHER_TARGET_2, DATA_WITHER_TARGET_3, dataProperties, deadTicks, effects, EMPTY_ARRAY, entityCollisionReduction, entityCount, entityUniqueId, fallDistance, fireProof, fireTicks, firstMove, freezingTicks, hasSpawned, headYawDelta, health, highestPosition, id, inBlock, inEndPortal, inPortalTicks, invulnerable, isCollided, isCollidedHorizontally, isCollidedVertically, isPlayer, isStatic, justCreated, keepMovement, lastDamageCause, lastHeadYaw, lastMotionX, lastMotionY, lastMotionZ, lastPitch, lastUpdate, lastX, lastY, lastYaw, lastZ, maxFireTicks, motionChanged, motionX, motionY, motionZ, namedTag, noClip, noDamageTicks, onGround, passengers, pitchDelta, positionChanged, riding, scale, server, temporalVector, ticksLived, timing, yawDelta, ySize

Fields inherited from class cn.nukkit.level.Location

headYaw, pitch, yaw

Fields inherited from class cn.nukkit.level.Position

level

Fields inherited from class cn.nukkit.math.Vector3

x, y, z, ZERO

Constructor Summary

Constructors

Constructor	Description
EntityCreeper(FullChunk chunk, CompoundTag nbt)

Method Summary

Modifier and Type	Method	Description
boolean	attack(EntityDamageEvent source)
boolean	canDoInteraction()
IBehaviorGroup	getBehaviorGroup()	返回此实体持有的行为组IBehaviorGroup 默认实现只会返回一个空行为EmptyBehaviorGroup常量，若你想让实体具有AI，你需要覆写此方法
Item[]	getDrops()
float	getHeight()
String	getInteractButtonText(Player player)
int	getNetworkId()
String	getOriginalName()	The name that English name of the type of this entity.
float	getWidth()
protected void	initEntity()
boolean	isPowered()
boolean	isPreventingSleep(Player player)
boolean	onInteract(Player player, Item item, Vector3 clickedPos)
void	onStruckByLightning(Entity entity)
void	setPowered(boolean powered)
void	setPowered(EntityLightningStrike bolt)

Methods inherited from class cn.nukkit.entity.mob.EntityMob

calculateEnchantmentProtectionFactor, canEquipByDispenser, damageArmor, getArmorInventory, getEquipmentInventory, getInventory, saveNBT, setOnFire, spawnTo, spawnToAll

Methods inherited from class cn.nukkit.entity.EntityIntelligent

asyncPrepare, enableHeadYaw, getJumpingHeight, getLookTarget, getMemoryStorage, getMoveDirectionEnd, getMoveDirectionStart, getMoveTarget, hasMoveDirection, isActive, isEnablePitch, isNeedUpdateMoveDirection, onUpdate, setActive, setEnablePitch, setLookTarget, setMoveDirectionEnd, setMoveDirectionStart, setMoveTarget, setNeedUpdateMoveDirection

Methods inherited from class cn.nukkit.entity.EntityPhysical

addPreviousLiquidMovement, addTmpMoveMotion, addTmpMoveMotionXZ, calculateOffsetBoundingBox, canBeMovedByCurrents, getFallingTick, getFootHeight, getGravity, getLiquidMovementSpeed, getMovementSpeedAtBlock, getOffsetBoundingBox, handleCollideMovement, handleFloatingMovement, handleFrictionMovement, handleGravity, handleLiquidMovement, hasWaterAt, onCollide, resetFallDistance, updateMovement

Methods inherited from class cn.nukkit.entity.EntityCreature

applyNameTag, playerApplyNameTag

Methods inherited from class cn.nukkit.entity.EntityLiving

blockedByShield, collidingWith, entityBaseTick, entityBaseTick, getAirTicks, getAttackTime, getAttackTimeBefore, getDrag, getLineOfSight, getLineOfSight, getLineOfSight, getLineOfSight, getMovementSpeed, getTargetBlock, getTargetBlock, getTargetBlock, hasLineOfSight, isAttackTimeByShieldKb, isBlocking, isPersistent, kill, knockBack, knockBack, onBlock, postAttack, preAttack, setAirTicks, setBlocking, setHealth, setMovementSpeed, setPersistent

Methods inherited from class cn.nukkit.entity.Entity

addEffect, addFreezingTicks, addMotion, addMovement, addTag, applyEntityCollision, attack, broadcastLinkPacket, canBePushed, canClimb, canClimbWalls, canCollide, canCollideWith, canPassThrough, canTriggerWalking, checkBlockCollision, checkChunks, checkGroundState, checkObstruction, close, collideWithBlock, containTag, createAddEntityPacket, createEntity, createEntity, createEntity, createEntity, despawnFrom, despawnFromAll, dismountEntity, dismountEntity, doesTriggerPressurePlate, equals, extinguish, fall, fastMove, getAbsorption, getAge, getAllTags, getBaseOffset, getBlocksAround, getBoundingBox, getCollisionBlocks, getCurrentHeight, getDataFlag, getDataProperties, getDataProperty, getDataPropertyBoolean, getDataPropertyByte, getDataPropertyFloat, getDataPropertyInt, getDataPropertyLong, getDataPropertyNBT, getDataPropertyPos, getDataPropertyShort, getDataPropertyString, getDataPropertyType, getDataPropertyVector3f, getDefaultNBT, getDefaultNBT, getDefaultNBT, getDirection, getDirectionPlane, getDirectionVector, getEffect, getEffects, getEntityDefinitions, getEyeHeight, getFreezingEffectStrength, getFreezingTicks, getHealth, getHorizontalFacing, getId, getKnownEntityIds, getLastDamageCause, getLength, getLocation, getMaxHealth, getMetadata, getMotion, getMountedOffset, getName, getNameTag, getPassenger, getPassengers, getPosition, getRiding, getSaveId, getSaveId, getSaveId, getSaveIds, getScale, getScoreTag, getSeatPosition, getServer, getStepHeight, getSwimmingHeight, getUniqueId, getViewers, getVisibleName, handleLavaMovement, hasControllingPassenger, hasCustomName, hasEffect, hashCode, hasMetadata, heal, heal, init, isAlive, isBoss, isClosed, isControlling, isGliding, isImmobile, isInEndPortal, isInsideOfFire, isInsideOfLava, isInsideOfSolid, isInsideOfWater, isNameTagAlwaysVisible, isNameTagVisible, isNoClip, isOnFire, isOnGround, isOnLadder, isPassenger, isSneaking, isSpinAttacking, isSprinting, isSwimming, isTouchingWater, isUndead, isUnderBlock, mountEntity, mountEntity, move, moveFlying, onCollideWithPlayer, onInteract, onPushByPiston, recalculateBoundingBox, recalculateBoundingBox, recalculateEffectColor, registerCustomEntity, registerEntity, registerEntity, removeAllEffects, removeEffect, removeMetadata, removeTag, respawnToAll, scheduleUpdate, sendData, sendData, sendData, sendData, sendPotionEffects, setAbsorption, setCanClimb, setCanClimb, setCanClimbWalls, setCanClimbWalls, setDataFlag, setDataFlag, setDataProperty, setDataProperty, setFreezingEffectStrength, setFreezingTicks, setGliding, setGliding, setImmobile, setImmobile, setLastDamageCause, setMaxHealth, setMetadata, setMotion, setNameTag, setNameTagAlwaysVisible, setNameTagAlwaysVisible, setNameTagVisible, setNameTagVisible, setNoClip, setPosition, setPositionAndRotation, setPositionAndRotation, setRotation, setRotation, setScale, setScoreTag, setSeatPosition, setSneaking, setSneaking, setSpinAttacking, setSpinAttacking, setSprinting, setSprinting, setSwimming, setSwimming, switchLevel, teleport, teleport, teleport, teleport, teleport, teleport, updateFallState, updatePassengerPosition, updatePassengers

Methods inherited from class cn.nukkit.level.Location

abs, add, add, add, add, ceil, clone, divide, floor, fromObject, fromObject, fromObject, fromObject, fromObject, getHeadYaw, getPitch, getYaw, multiply, round, setHeadYaw, setPitch, setYaw, subtract, subtract, subtract, subtract, subtract, toString

Methods inherited from class cn.nukkit.level.Position

getChunk, getLevel, getLevelBlock, getLevelBlock, getLevelBlock, getLevelBlockAround, getLevelBlockAtLayer, getLevelBlockEntity, getLevelBlockState, getLevelBlockState, getLevelName, getSide, getSide, getTickCachedLevelBlock, getTickCachedLevelBlockAtLayer, getTypedBlockEntity, getValidLevel, isValid, setComponents, setComponents, setLevel, setStrong, setWeak

Methods inherited from class cn.nukkit.positiontracking.NamedPosition

matchesNamedPosition

Methods inherited from class cn.nukkit.math.Vector3

asBlockVector3, asVector3f, cross, distance, distance, distanceManhattan, distanceSquared, distanceSquared, dot, down, down, east, east, getAxis, getChunkSectionY, getChunkVector, getChunkX, getChunkZ, getFloorX, getFloorY, getFloorZ, getForward, getIntermediateWithXValue, getIntermediateWithYValue, getIntermediateWithZValue, getRight, getSideVec, getSouth, getUp, getWest, getX, getY, getZ, length, lengthSquared, maxPlainDistance, maxPlainDistance, maxPlainDistance, maxPlainDistance, maxPlainDistance, normalize, north, north, rawHashCode, setComponentsAdding, setComponentsAdding, setX, setY, setZ, south, south, up, up, west, west

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface cn.nukkit.inventory.EntityInventoryHolder

getBoots, getChestplate, getHelmet, getItemInHand, getLeggings, setBoots, setChestplate, setHelmet, setItemInHand, setLeggings

Methods inherited from interface cn.nukkit.entity.EntityNameable

applyNameTag, getNameTag, isNameTagVisible, isPersistent, playerApplyNameTag, setNameTag, setNameTagVisible, setPersistent

Field Details

NETWORK_ID

public static final int NETWORK_ID

See Also:

• Constant Field Values

DATA_SWELL_DIRECTION

public static final int DATA_SWELL_DIRECTION

See Also:

• Constant Field Values

DATA_SWELL

public static final int DATA_SWELL

See Also:

• Constant Field Values

DATA_SWELL_OLD

public static final int DATA_SWELL_OLD

See Also:

• Constant Field Values

DATA_POWERED

public static final int DATA_POWERED

See Also:

• Constant Field Values

Constructor Details

EntityCreeper

public EntityCreeper(FullChunk chunk,
 CompoundTag nbt)

Method Details

getBehaviorGroup

public IBehaviorGroup getBehaviorGroup()

Description copied from class: EntityIntelligent

返回此实体持有的行为组IBehaviorGroup
默认实现只会返回一个空行为EmptyBehaviorGroup常量，若你想让实体具有AI，你需要覆写此方法

Overrides:

getBehaviorGroup in class EntityIntelligent

Returns:

此实体持有的行为组

getNetworkId

public int getNetworkId()

Specified by:

getNetworkId in class Entity

getWidth

public float getWidth()

Overrides:

getWidth in class Entity

getHeight

public float getHeight()

Overrides:

getHeight in class Entity

isPowered

public boolean isPowered()

setPowered

public void setPowered(EntityLightningStrike bolt)

setPowered

public void setPowered(boolean powered)

onStruckByLightning

public void onStruckByLightning(Entity entity)

Overrides:

onStruckByLightning in class Entity

initEntity

protected void initEntity()

Overrides:

initEntity in class EntityMob

getOriginalName

@PowerNukkitOnly
@Since("1.5.1.0-PN")
public String getOriginalName()

Description copied from class: Entity

The name that English name of the type of this entity.

Overrides:

getOriginalName in class Entity

getDrops

public Item[] getDrops()

Overrides:

getDrops in class EntityLiving

isPreventingSleep

@PowerNukkitOnly
public boolean isPreventingSleep(Player player)

Overrides:

isPreventingSleep in class Entity

attack

public boolean attack(EntityDamageEvent source)

Overrides:

attack in class EntityMob

onInteract

public boolean onInteract(Player player,
 Item item,
 Vector3 clickedPos)

Specified by:

onInteract in interface EntityNameable

Overrides:

onInteract in class EntityCreature

getInteractButtonText

public String getInteractButtonText(Player player)

Specified by:

getInteractButtonText in interface EntityInteractable

canDoInteraction

public boolean canDoInteraction()

Specified by:

canDoInteraction in interface EntityInteractable