    001package net.minecraft.entity.projectile;
    002
    003import cpw.mods.fml.relauncher.Side;
    004import cpw.mods.fml.relauncher.SideOnly;
    005import java.util.List;
    006import net.minecraft.block.Block;
    007import net.minecraft.enchantment.EnchantmentThorns;
    008import net.minecraft.entity.Entity;
    009import net.minecraft.entity.EntityLiving;
    010import net.minecraft.entity.IProjectile;
    011import net.minecraft.entity.monster.EntityEnderman;
    012import net.minecraft.entity.player.EntityPlayer;
    013import net.minecraft.entity.player.EntityPlayerMP;
    014import net.minecraft.item.Item;
    015import net.minecraft.item.ItemStack;
    016import net.minecraft.nbt.NBTTagCompound;
    017import net.minecraft.network.packet.Packet70GameEvent;
    018import net.minecraft.util.AxisAlignedBB;
    019import net.minecraft.util.DamageSource;
    020import net.minecraft.util.MathHelper;
    021import net.minecraft.util.MovingObjectPosition;
    022import net.minecraft.util.Vec3;
    023import net.minecraft.world.World;
    024
    025public class EntityArrow extends Entity implements IProjectile
    026{
    027    private int xTile = -1;
    028    private int yTile = -1;
    029    private int zTile = -1;
    030    private int inTile = 0;
    031    private int inData = 0;
    032    private boolean inGround = false;
    033
    034    /** 1 if the player can pick up the arrow */
    035    public int canBePickedUp = 0;
    036
    037    /** Seems to be some sort of timer for animating an arrow. */
    038    public int arrowShake = 0;
    039
    040    /** The owner of this arrow. */
    041    public Entity shootingEntity;
    042    private int ticksInGround;
    043    private int ticksInAir = 0;
    044    private double damage = 2.0D;
    045
    046    /** The amount of knockback an arrow applies when it hits a mob. */
    047    private int knockbackStrength;
    048
    049    public EntityArrow(World par1World)
    050    {
    051        super(par1World);
    052        this.renderDistanceWeight = 10.0D;
    053        this.setSize(0.5F, 0.5F);
    054    }
    055
    056    public EntityArrow(World par1World, double par2, double par4, double par6)
    057    {
    058        super(par1World);
    059        this.renderDistanceWeight = 10.0D;
    060        this.setSize(0.5F, 0.5F);
    061        this.setPosition(par2, par4, par6);
    062        this.yOffset = 0.0F;
    063    }
    064
    065    public EntityArrow(World par1World, EntityLiving par2EntityLiving, EntityLiving par3EntityLiving, float par4, float par5)
    066    {
    067        super(par1World);
    068        this.renderDistanceWeight = 10.0D;
    069        this.shootingEntity = par2EntityLiving;
    070
    071        if (par2EntityLiving instanceof EntityPlayer)
    072        {
    073            this.canBePickedUp = 1;
    074        }
    075
    076        this.posY = par2EntityLiving.posY + (double)par2EntityLiving.getEyeHeight() - 0.10000000149011612D;
    077        double var6 = par3EntityLiving.posX - par2EntityLiving.posX;
    078        double var8 = par3EntityLiving.posY + (double)par3EntityLiving.getEyeHeight() - 0.699999988079071D - this.posY;
    079        double var10 = par3EntityLiving.posZ - par2EntityLiving.posZ;
    080        double var12 = (double)MathHelper.sqrt_double(var6 * var6 + var10 * var10);
    081
    082        if (var12 >= 1.0E-7D)
    083        {
    084            float var14 = (float)(Math.atan2(var10, var6) * 180.0D / Math.PI) - 90.0F;
    085            float var15 = (float)(-(Math.atan2(var8, var12) * 180.0D / Math.PI));
    086            double var16 = var6 / var12;
    087            double var18 = var10 / var12;
    088            this.setLocationAndAngles(par2EntityLiving.posX + var16, this.posY, par2EntityLiving.posZ + var18, var14, var15);
    089            this.yOffset = 0.0F;
    090            float var20 = (float)var12 * 0.2F;
    091            this.setThrowableHeading(var6, var8 + (double)var20, var10, par4, par5);
    092        }
    093    }
    094
    095    public EntityArrow(World par1World, EntityLiving par2EntityLiving, float par3)
    096    {
    097        super(par1World);
    098        this.renderDistanceWeight = 10.0D;
    099        this.shootingEntity = par2EntityLiving;
    100
    101        if (par2EntityLiving instanceof EntityPlayer)
    102        {
    103            this.canBePickedUp = 1;
    104        }
    105
    106        this.setSize(0.5F, 0.5F);
    107        this.setLocationAndAngles(par2EntityLiving.posX, par2EntityLiving.posY + (double)par2EntityLiving.getEyeHeight(), par2EntityLiving.posZ, par2EntityLiving.rotationYaw, par2EntityLiving.rotationPitch);
    108        this.posX -= (double)(MathHelper.cos(this.rotationYaw / 180.0F * (float)Math.PI) * 0.16F);
    109        this.posY -= 0.10000000149011612D;
    110        this.posZ -= (double)(MathHelper.sin(this.rotationYaw / 180.0F * (float)Math.PI) * 0.16F);
    111        this.setPosition(this.posX, this.posY, this.posZ);
    112        this.yOffset = 0.0F;
    113        this.motionX = (double)(-MathHelper.sin(this.rotationYaw / 180.0F * (float)Math.PI) * MathHelper.cos(this.rotationPitch / 180.0F * (float)Math.PI));
    114        this.motionZ = (double)(MathHelper.cos(this.rotationYaw / 180.0F * (float)Math.PI) * MathHelper.cos(this.rotationPitch / 180.0F * (float)Math.PI));
    115        this.motionY = (double)(-MathHelper.sin(this.rotationPitch / 180.0F * (float)Math.PI));
    116        this.setThrowableHeading(this.motionX, this.motionY, this.motionZ, par3 * 1.5F, 1.0F);
    117    }
    118
    119    protected void entityInit()
    120    {
    121        this.dataWatcher.addObject(16, Byte.valueOf((byte)0));
    122    }
    123
    124    /**
    125     * Similar to setArrowHeading, it's point the throwable entity to a x, y, z direction.
    126     */
    127    public void setThrowableHeading(double par1, double par3, double par5, float par7, float par8)
    128    {
    129        float var9 = MathHelper.sqrt_double(par1 * par1 + par3 * par3 + par5 * par5);
    130        par1 /= (double)var9;
    131        par3 /= (double)var9;
    132        par5 /= (double)var9;
    133        par1 += this.rand.nextGaussian() * 0.007499999832361937D * (double)par8;
    134        par3 += this.rand.nextGaussian() * 0.007499999832361937D * (double)par8;
    135        par5 += this.rand.nextGaussian() * 0.007499999832361937D * (double)par8;
    136        par1 *= (double)par7;
    137        par3 *= (double)par7;
    138        par5 *= (double)par7;
    139        this.motionX = par1;
    140        this.motionY = par3;
    141        this.motionZ = par5;
    142        float var10 = MathHelper.sqrt_double(par1 * par1 + par5 * par5);
    143        this.prevRotationYaw = this.rotationYaw = (float)(Math.atan2(par1, par5) * 180.0D / Math.PI);
    144        this.prevRotationPitch = this.rotationPitch = (float)(Math.atan2(par3, (double)var10) * 180.0D / Math.PI);
    145        this.ticksInGround = 0;
    146    }
    147
    148    @SideOnly(Side.CLIENT)
    149
    150    /**
    151     * Sets the position and rotation. Only difference from the other one is no bounding on the rotation. Args: posX,
    152     * posY, posZ, yaw, pitch
    153     */
    154    public void setPositionAndRotation2(double par1, double par3, double par5, float par7, float par8, int par9)
    155    {
    156        this.setPosition(par1, par3, par5);
    157        this.setRotation(par7, par8);
    158    }
    159
    160    @SideOnly(Side.CLIENT)
    161
    162    /**
    163     * Sets the velocity to the args. Args: x, y, z
    164     */
    165    public void setVelocity(double par1, double par3, double par5)
    166    {
    167        this.motionX = par1;
    168        this.motionY = par3;
    169        this.motionZ = par5;
    170
    171        if (this.prevRotationPitch == 0.0F && this.prevRotationYaw == 0.0F)
    172        {
    173            float var7 = MathHelper.sqrt_double(par1 * par1 + par5 * par5);
    174            this.prevRotationYaw = this.rotationYaw = (float)(Math.atan2(par1, par5) * 180.0D / Math.PI);
    175            this.prevRotationPitch = this.rotationPitch = (float)(Math.atan2(par3, (double)var7) * 180.0D / Math.PI);
    176            this.prevRotationPitch = this.rotationPitch;
    177            this.prevRotationYaw = this.rotationYaw;
    178            this.setLocationAndAngles(this.posX, this.posY, this.posZ, this.rotationYaw, this.rotationPitch);
    179            this.ticksInGround = 0;
    180        }
    181    }
    182
    183    /**
    184     * Called to update the entity's position/logic.
    185     */
    186    public void onUpdate()
    187    {
    188        super.onUpdate();
    189
    190        if (this.prevRotationPitch == 0.0F && this.prevRotationYaw == 0.0F)
    191        {
    192            float var1 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionZ * this.motionZ);
    193            this.prevRotationYaw = this.rotationYaw = (float)(Math.atan2(this.motionX, this.motionZ) * 180.0D / Math.PI);
    194            this.prevRotationPitch = this.rotationPitch = (float)(Math.atan2(this.motionY, (double)var1) * 180.0D / Math.PI);
    195        }
    196
    197        int var16 = this.worldObj.getBlockId(this.xTile, this.yTile, this.zTile);
    198
    199        if (var16 > 0)
    200        {
    201            Block.blocksList[var16].setBlockBoundsBasedOnState(this.worldObj, this.xTile, this.yTile, this.zTile);
    202            AxisAlignedBB var2 = Block.blocksList[var16].getCollisionBoundingBoxFromPool(this.worldObj, this.xTile, this.yTile, this.zTile);
    203
    204            if (var2 != null && var2.isVecInside(this.worldObj.getWorldVec3Pool().getVecFromPool(this.posX, this.posY, this.posZ)))
    205            {
    206                this.inGround = true;
    207            }
    208        }
    209
    210        if (this.arrowShake > 0)
    211        {
    212            --this.arrowShake;
    213        }
    214
    215        if (this.inGround)
    216        {
    217            int var18 = this.worldObj.getBlockId(this.xTile, this.yTile, this.zTile);
    218            int var19 = this.worldObj.getBlockMetadata(this.xTile, this.yTile, this.zTile);
    219
    220            if (var18 == this.inTile && var19 == this.inData)
    221            {
    222                ++this.ticksInGround;
    223
    224                if (this.ticksInGround == 1200)
    225                {
    226                    this.setDead();
    227                }
    228            }
    229            else
    230            {
    231                this.inGround = false;
    232                this.motionX *= (double)(this.rand.nextFloat() * 0.2F);
    233                this.motionY *= (double)(this.rand.nextFloat() * 0.2F);
    234                this.motionZ *= (double)(this.rand.nextFloat() * 0.2F);
    235                this.ticksInGround = 0;
    236                this.ticksInAir = 0;
    237            }
    238        }
    239        else
    240        {
    241            ++this.ticksInAir;
    242            Vec3 var17 = this.worldObj.getWorldVec3Pool().getVecFromPool(this.posX, this.posY, this.posZ);
    243            Vec3 var3 = this.worldObj.getWorldVec3Pool().getVecFromPool(this.posX + this.motionX, this.posY + this.motionY, this.posZ + this.motionZ);
    244            MovingObjectPosition var4 = this.worldObj.rayTraceBlocks_do_do(var17, var3, false, true);
    245            var17 = this.worldObj.getWorldVec3Pool().getVecFromPool(this.posX, this.posY, this.posZ);
    246            var3 = this.worldObj.getWorldVec3Pool().getVecFromPool(this.posX + this.motionX, this.posY + this.motionY, this.posZ + this.motionZ);
    247
    248            if (var4 != null)
    249            {
    250                var3 = this.worldObj.getWorldVec3Pool().getVecFromPool(var4.hitVec.xCoord, var4.hitVec.yCoord, var4.hitVec.zCoord);
    251            }
    252
    253            Entity var5 = null;
    254            List var6 = this.worldObj.getEntitiesWithinAABBExcludingEntity(this, this.boundingBox.addCoord(this.motionX, this.motionY, this.motionZ).expand(1.0D, 1.0D, 1.0D));
    255            double var7 = 0.0D;
    256            int var9;
    257            float var11;
    258
    259            for (var9 = 0; var9 < var6.size(); ++var9)
    260            {
    261                Entity var10 = (Entity)var6.get(var9);
    262
    263                if (var10.canBeCollidedWith() && (var10 != this.shootingEntity || this.ticksInAir >= 5))
    264                {
    265                    var11 = 0.3F;
    266                    AxisAlignedBB var12 = var10.boundingBox.expand((double)var11, (double)var11, (double)var11);
    267                    MovingObjectPosition var13 = var12.calculateIntercept(var17, var3);
    268
    269                    if (var13 != null)
    270                    {
    271                        double var14 = var17.distanceTo(var13.hitVec);
    272
    273                        if (var14 < var7 || var7 == 0.0D)
    274                        {
    275                            var5 = var10;
    276                            var7 = var14;
    277                        }
    278                    }
    279                }
    280            }
    281
    282            if (var5 != null)
    283            {
    284                var4 = new MovingObjectPosition(var5);
    285            }
    286
    287            float var20;
    288            float var26;
    289
    290            if (var4 != null)
    291            {
    292                if (var4.entityHit != null)
    293                {
    294                    var20 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionY * this.motionY + this.motionZ * this.motionZ);
    295                    int var23 = MathHelper.ceiling_double_int((double)var20 * this.damage);
    296
    297                    if (this.getIsCritical())
    298                    {
    299                        var23 += this.rand.nextInt(var23 / 2 + 2);
    300                    }
    301
    302                    DamageSource var21 = null;
    303
    304                    if (this.shootingEntity == null)
    305                    {
    306                        var21 = DamageSource.causeArrowDamage(this, this);
    307                    }
    308                    else
    309                    {
    310                        var21 = DamageSource.causeArrowDamage(this, this.shootingEntity);
    311                    }
    312
    313                    if (this.isBurning() && !(var4.entityHit instanceof EntityEnderman))
    314                    {
    315                        var4.entityHit.setFire(5);
    316                    }
    317
    318                    if (var4.entityHit.attackEntityFrom(var21, var23))
    319                    {
    320                        if (var4.entityHit instanceof EntityLiving)
    321                        {
    322                            EntityLiving var24 = (EntityLiving)var4.entityHit;
    323
    324                            if (!this.worldObj.isRemote)
    325                            {
    326                                var24.setArrowCountInEntity(var24.getArrowCountInEntity() + 1);
    327                            }
    328
    329                            if (this.knockbackStrength > 0)
    330                            {
    331                                var26 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionZ * this.motionZ);
    332
    333                                if (var26 > 0.0F)
    334                                {
    335                                    var4.entityHit.addVelocity(this.motionX * (double)this.knockbackStrength * 0.6000000238418579D / (double)var26, 0.1D, this.motionZ * (double)this.knockbackStrength * 0.6000000238418579D / (double)var26);
    336                                }
    337                            }
    338
    339                            if (this.shootingEntity != null)
    340                            {
    341                                EnchantmentThorns.func_92096_a(this.shootingEntity, var24, this.rand);
    342                            }
    343
    344                            if (this.shootingEntity != null && var4.entityHit != this.shootingEntity && var4.entityHit instanceof EntityPlayer && this.shootingEntity instanceof EntityPlayerMP)
    345                            {
    346                                ((EntityPlayerMP)this.shootingEntity).playerNetServerHandler.sendPacketToPlayer(new Packet70GameEvent(6, 0));
    347                            }
    348                        }
    349
    350                        this.playSound("random.bowhit", 1.0F, 1.2F / (this.rand.nextFloat() * 0.2F + 0.9F));
    351
    352                        if (!(var4.entityHit instanceof EntityEnderman))
    353                        {
    354                            this.setDead();
    355                        }
    356                    }
    357                    else
    358                    {
    359                        this.motionX *= -0.10000000149011612D;
    360                        this.motionY *= -0.10000000149011612D;
    361                        this.motionZ *= -0.10000000149011612D;
    362                        this.rotationYaw += 180.0F;
    363                        this.prevRotationYaw += 180.0F;
    364                        this.ticksInAir = 0;
    365                    }
    366                }
    367                else
    368                {
    369                    this.xTile = var4.blockX;
    370                    this.yTile = var4.blockY;
    371                    this.zTile = var4.blockZ;
    372                    this.inTile = this.worldObj.getBlockId(this.xTile, this.yTile, this.zTile);
    373                    this.inData = this.worldObj.getBlockMetadata(this.xTile, this.yTile, this.zTile);
    374                    this.motionX = (double)((float)(var4.hitVec.xCoord - this.posX));
    375                    this.motionY = (double)((float)(var4.hitVec.yCoord - this.posY));
    376                    this.motionZ = (double)((float)(var4.hitVec.zCoord - this.posZ));
    377                    var20 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionY * this.motionY + this.motionZ * this.motionZ);
    378                    this.posX -= this.motionX / (double)var20 * 0.05000000074505806D;
    379                    this.posY -= this.motionY / (double)var20 * 0.05000000074505806D;
    380                    this.posZ -= this.motionZ / (double)var20 * 0.05000000074505806D;
    381                    this.playSound("random.bowhit", 1.0F, 1.2F / (this.rand.nextFloat() * 0.2F + 0.9F));
    382                    this.inGround = true;
    383                    this.arrowShake = 7;
    384                    this.setIsCritical(false);
    385
    386                    if (this.inTile != 0)
    387                    {
    388                        Block.blocksList[this.inTile].onEntityCollidedWithBlock(this.worldObj, this.xTile, this.yTile, this.zTile, this);
    389                    }
    390                }
    391            }
    392
    393            if (this.getIsCritical())
    394            {
    395                for (var9 = 0; var9 < 4; ++var9)
    396                {
    397                    this.worldObj.spawnParticle("crit", this.posX + this.motionX * (double)var9 / 4.0D, this.posY + this.motionY * (double)var9 / 4.0D, this.posZ + this.motionZ * (double)var9 / 4.0D, -this.motionX, -this.motionY + 0.2D, -this.motionZ);
    398                }
    399            }
    400
    401            this.posX += this.motionX;
    402            this.posY += this.motionY;
    403            this.posZ += this.motionZ;
    404            var20 = MathHelper.sqrt_double(this.motionX * this.motionX + this.motionZ * this.motionZ);
    405            this.rotationYaw = (float)(Math.atan2(this.motionX, this.motionZ) * 180.0D / Math.PI);
    406
    407            for (this.rotationPitch = (float)(Math.atan2(this.motionY, (double)var20) * 180.0D / Math.PI); this.rotationPitch - this.prevRotationPitch < -180.0F; this.prevRotationPitch -= 360.0F)
    408            {
    409                ;
    410            }
    411
    412            while (this.rotationPitch - this.prevRotationPitch >= 180.0F)
    413            {
    414                this.prevRotationPitch += 360.0F;
    415            }
    416
    417            while (this.rotationYaw - this.prevRotationYaw < -180.0F)
    418            {
    419                this.prevRotationYaw -= 360.0F;
    420            }
    421
    422            while (this.rotationYaw - this.prevRotationYaw >= 180.0F)
    423            {
    424                this.prevRotationYaw += 360.0F;
    425            }
    426
    427            this.rotationPitch = this.prevRotationPitch + (this.rotationPitch - this.prevRotationPitch) * 0.2F;
    428            this.rotationYaw = this.prevRotationYaw + (this.rotationYaw - this.prevRotationYaw) * 0.2F;
    429            float var22 = 0.99F;
    430            var11 = 0.05F;
    431
    432            if (this.isInWater())
    433            {
    434                for (int var25 = 0; var25 < 4; ++var25)
    435                {
    436                    var26 = 0.25F;
    437                    this.worldObj.spawnParticle("bubble", this.posX - this.motionX * (double)var26, this.posY - this.motionY * (double)var26, this.posZ - this.motionZ * (double)var26, this.motionX, this.motionY, this.motionZ);
    438                }
    439
    440                var22 = 0.8F;
    441            }
    442
    443            this.motionX *= (double)var22;
    444            this.motionY *= (double)var22;
    445            this.motionZ *= (double)var22;
    446            this.motionY -= (double)var11;
    447            this.setPosition(this.posX, this.posY, this.posZ);
    448            this.doBlockCollisions();
    449        }
    450    }
    451
    452    /**
    453     * (abstract) Protected helper method to write subclass entity data to NBT.
    454     */
    455    public void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
    456    {
    457        par1NBTTagCompound.setShort("xTile", (short)this.xTile);
    458        par1NBTTagCompound.setShort("yTile", (short)this.yTile);
    459        par1NBTTagCompound.setShort("zTile", (short)this.zTile);
    460        par1NBTTagCompound.setByte("inTile", (byte)this.inTile);
    461        par1NBTTagCompound.setByte("inData", (byte)this.inData);
    462        par1NBTTagCompound.setByte("shake", (byte)this.arrowShake);
    463        par1NBTTagCompound.setByte("inGround", (byte)(this.inGround ? 1 : 0));
    464        par1NBTTagCompound.setByte("pickup", (byte)this.canBePickedUp);
    465        par1NBTTagCompound.setDouble("damage", this.damage);
    466    }
    467
    468    /**
    469     * (abstract) Protected helper method to read subclass entity data from NBT.
    470     */
    471    public void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
    472    {
    473        this.xTile = par1NBTTagCompound.getShort("xTile");
    474        this.yTile = par1NBTTagCompound.getShort("yTile");
    475        this.zTile = par1NBTTagCompound.getShort("zTile");
    476        this.inTile = par1NBTTagCompound.getByte("inTile") & 255;
    477        this.inData = par1NBTTagCompound.getByte("inData") & 255;
    478        this.arrowShake = par1NBTTagCompound.getByte("shake") & 255;
    479        this.inGround = par1NBTTagCompound.getByte("inGround") == 1;
    480
    481        if (par1NBTTagCompound.hasKey("damage"))
    482        {
    483            this.damage = par1NBTTagCompound.getDouble("damage");
    484        }
    485
    486        if (par1NBTTagCompound.hasKey("pickup"))
    487        {
    488            this.canBePickedUp = par1NBTTagCompound.getByte("pickup");
    489        }
    490        else if (par1NBTTagCompound.hasKey("player"))
    491        {
    492            this.canBePickedUp = par1NBTTagCompound.getBoolean("player") ? 1 : 0;
    493        }
    494    }
    495
    496    /**
    497     * Called by a player entity when they collide with an entity
    498     */
    499    public void onCollideWithPlayer(EntityPlayer par1EntityPlayer)
    500    {
    501        if (!this.worldObj.isRemote && this.inGround && this.arrowShake <= 0)
    502        {
    503            boolean var2 = this.canBePickedUp == 1 || this.canBePickedUp == 2 && par1EntityPlayer.capabilities.isCreativeMode;
    504
    505            if (this.canBePickedUp == 1 && !par1EntityPlayer.inventory.addItemStackToInventory(new ItemStack(Item.arrow, 1)))
    506            {
    507                var2 = false;
    508            }
    509
    510            if (var2)
    511            {
    512                this.playSound("random.pop", 0.2F, ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.7F + 1.0F) * 2.0F);
    513                par1EntityPlayer.onItemPickup(this, 1);
    514                this.setDead();
    515            }
    516        }
    517    }
    518
    519    /**
    520     * returns if this entity triggers Block.onEntityWalking on the blocks they walk on. used for spiders and wolves to
    521     * prevent them from trampling crops
    522     */
    523    protected boolean canTriggerWalking()
    524    {
    525        return false;
    526    }
    527
    528    @SideOnly(Side.CLIENT)
    529    public float getShadowSize()
    530    {
    531        return 0.0F;
    532    }
    533
    534    public void setDamage(double par1)
    535    {
    536        this.damage = par1;
    537    }
    538
    539    public double getDamage()
    540    {
    541        return this.damage;
    542    }
    543
    544    /**
    545     * Sets the amount of knockback the arrow applies when it hits a mob.
    546     */
    547    public void setKnockbackStrength(int par1)
    548    {
    549        this.knockbackStrength = par1;
    550    }
    551
    552    /**
    553     * If returns false, the item will not inflict any damage against entities.
    554     */
    555    public boolean canAttackWithItem()
    556    {
    557        return false;
    558    }
    559
    560    /**
    561     * Whether the arrow has a stream of critical hit particles flying behind it.
    562     */
    563    public void setIsCritical(boolean par1)
    564    {
    565        byte var2 = this.dataWatcher.getWatchableObjectByte(16);
    566
    567        if (par1)
    568        {
    569            this.dataWatcher.updateObject(16, Byte.valueOf((byte)(var2 | 1)));
    570        }
    571        else
    572        {
    573            this.dataWatcher.updateObject(16, Byte.valueOf((byte)(var2 & -2)));
    574        }
    575    }
    576
    577    /**
    578     * Whether the arrow has a stream of critical hit particles flying behind it.
    579     */
    580    public boolean getIsCritical()
    581    {
    582        byte var1 = this.dataWatcher.getWatchableObjectByte(16);
    583        return (var1 & 1) != 0;
    584    }
    585}