EntityMob.java

package net.minecraft.entity.monster;

import net.minecraft.enchantment.EnchantmentHelper;
import net.minecraft.enchantment.EnchantmentThorns;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityCreature;
import net.minecraft.entity.EntityLiving;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.potion.Potion;
import net.minecraft.util.DamageSource;
import net.minecraft.util.MathHelper;
import net.minecraft.world.EnumSkyBlock;
import net.minecraft.world.World;

public abstract class EntityMob extends EntityCreature implements IMob
{
    public EntityMob(World par1World)
    {
        super(par1World);
        this.experienceValue = 5;
    }

    /**
     * Called frequently so the entity can update its state every tick as required. For example, zombies and skeletons
     * use this to react to sunlight and start to burn.
     */
    public void onLivingUpdate()
    {
        this.updateArmSwingProgress();
        float f = this.getBrightness(1.0F);

        if (f > 0.5F)
        {
            this.entityAge += 2;
        }

        super.onLivingUpdate();
    }

    /**
     * Called to update the entity's position/logic.
     */
    public void onUpdate()
    {
        super.onUpdate();

        if (!this.worldObj.isRemote && this.worldObj.difficultySetting == 0)
        {
            this.setDead();
        }
    }

    /**
     * Finds the closest player within 16 blocks to attack, or null if this Entity isn't interested in attacking
     * (Animals, Spiders at day, peaceful PigZombies).
     */
    protected Entity findPlayerToAttack()
    {
        EntityPlayer entityplayer = this.worldObj.getClosestVulnerablePlayerToEntity(this, 16.0D);
        return entityplayer != null && this.canEntityBeSeen(entityplayer) ? entityplayer : null;
    }

    /**
     * Called when the entity is attacked.
     */
    public boolean attackEntityFrom(DamageSource par1DamageSource, int par2)
    {
        if (this.isEntityInvulnerable())
        {
            return false;
        }
        else if (super.attackEntityFrom(par1DamageSource, par2))
        {
            Entity entity = par1DamageSource.getEntity();

            if (this.riddenByEntity != entity && this.ridingEntity != entity)
            {
                if (entity != this)
                {
                    this.entityToAttack = entity;
                }

                return true;
            }
            else
            {
                return true;
            }
        }
        else
        {
            return false;
        }
    }

    public boolean attackEntityAsMob(Entity par1Entity)
    {
        int i = this.getAttackStrength(par1Entity);

        if (this.isPotionActive(Potion.damageBoost))
        {
            i += 3 << this.getActivePotionEffect(Potion.damageBoost).getAmplifier();
        }

        if (this.isPotionActive(Potion.weakness))
        {
            i -= 2 << this.getActivePotionEffect(Potion.weakness).getAmplifier();
        }

        int j = 0;

        if (par1Entity instanceof EntityLiving)
        {
            i += EnchantmentHelper.getEnchantmentModifierLiving(this, (EntityLiving)par1Entity);
            j += EnchantmentHelper.getKnockbackModifier(this, (EntityLiving)par1Entity);
        }

        boolean flag = par1Entity.attackEntityFrom(DamageSource.causeMobDamage(this), i);

        if (flag)
        {
            if (j > 0)
            {
                par1Entity.addVelocity((double)(-MathHelper.sin(this.rotationYaw * (float)Math.PI / 180.0F) * (float)j * 0.5F), 0.1D, (double)(MathHelper.cos(this.rotationYaw * (float)Math.PI / 180.0F) * (float)j * 0.5F));
                this.motionX *= 0.6D;
                this.motionZ *= 0.6D;
            }

            int k = EnchantmentHelper.getFireAspectModifier(this);

            if (k > 0)
            {
                par1Entity.setFire(k * 4);
            }

            if (par1Entity instanceof EntityLiving)
            {
                EnchantmentThorns.func_92096_a(this, (EntityLiving)par1Entity, this.rand);
            }
        }

        return flag;
    }

    /**
     * Basic mob attack. Default to touch of death in EntityCreature. Overridden by each mob to define their attack.
     */
    protected void attackEntity(Entity par1Entity, float par2)
    {
        if (this.attackTime <= 0 && par2 < 2.0F && par1Entity.boundingBox.maxY > this.boundingBox.minY && par1Entity.boundingBox.minY < this.boundingBox.maxY)
        {
            this.attackTime = 20;
            this.attackEntityAsMob(par1Entity);
        }
    }

    /**
     * Takes a coordinate in and returns a weight to determine how likely this creature will try to path to the block.
     * Args: x, y, z
     */
    public float getBlockPathWeight(int par1, int par2, int par3)
    {
        return 0.5F - this.worldObj.getLightBrightness(par1, par2, par3);
    }

    /**
     * Checks to make sure the light is not too bright where the mob is spawning
     */
    protected boolean isValidLightLevel()
    {
        int i = MathHelper.floor_double(this.posX);
        int j = MathHelper.floor_double(this.boundingBox.minY);
        int k = MathHelper.floor_double(this.posZ);

        if (this.worldObj.getSavedLightValue(EnumSkyBlock.Sky, i, j, k) > this.rand.nextInt(32))
        {
            return false;
        }
        else
        {
            int l = this.worldObj.getBlockLightValue(i, j, k);

            if (this.worldObj.isThundering())
            {
                int i1 = this.worldObj.skylightSubtracted;
                this.worldObj.skylightSubtracted = 10;
                l = this.worldObj.getBlockLightValue(i, j, k);
                this.worldObj.skylightSubtracted = i1;
            }

            return l <= this.rand.nextInt(8);
        }
    }

    /**
     * Checks if the entity's current position is a valid location to spawn this entity.
     */
    public boolean getCanSpawnHere()
    {
        return this.isValidLightLevel() && super.getCanSpawnHere();
    }

    /**
     * Returns the amount of damage a mob should deal.
     */
    public int getAttackStrength(Entity par1Entity)
    {
        return 2;
    }
}