    001    package net.minecraft.src;
    002
    003    import java.util.List;
    004    import java.util.Random;
    005
    006    public class BlockDetectorRail extends BlockRail
    007    {
    008        public BlockDetectorRail(int par1, int par2)
    009        {
    010            super(par1, par2, true);
    011            this.setTickRandomly(true);
    012        }
    013
    014        /**
    015         * How many world ticks before ticking
    016         */
    017        public int tickRate()
    018        {
    019            return 20;
    020        }
    021
    022        /**
    023         * Can this block provide power. Only wire currently seems to have this change based on its state.
    024         */
    025        public boolean canProvidePower()
    026        {
    027            return true;
    028        }
    029
    030        /**
    031         * Triggered whenever an entity collides with this block (enters into the block). Args: world, x, y, z, entity
    032         */
    033        public void onEntityCollidedWithBlock(World par1World, int par2, int par3, int par4, Entity par5Entity)
    034        {
    035            if (!par1World.isRemote)
    036            {
    037                int var6 = par1World.getBlockMetadata(par2, par3, par4);
    038
    039                if ((var6 & 8) == 0)
    040                {
    041                    this.setStateIfMinecartInteractsWithRail(par1World, par2, par3, par4, var6);
    042                }
    043            }
    044        }
    045
    046        /**
    047         * Ticks the block if it's been scheduled
    048         */
    049        public void updateTick(World par1World, int par2, int par3, int par4, Random par5Random)
    050        {
    051            if (!par1World.isRemote)
    052            {
    053                int var6 = par1World.getBlockMetadata(par2, par3, par4);
    054
    055                if ((var6 & 8) != 0)
    056                {
    057                    this.setStateIfMinecartInteractsWithRail(par1World, par2, par3, par4, var6);
    058                }
    059            }
    060        }
    061
    062        /**
    063         * Is this block powering the block on the specified side
    064         */
    065        public boolean isPoweringTo(IBlockAccess par1IBlockAccess, int par2, int par3, int par4, int par5)
    066        {
    067            return (par1IBlockAccess.getBlockMetadata(par2, par3, par4) & 8) != 0;
    068        }
    069
    070        /**
    071         * Is this block indirectly powering the block on the specified side
    072         */
    073        public boolean isIndirectlyPoweringTo(IBlockAccess par1IBlockAccess, int par2, int par3, int par4, int par5)
    074        {
    075            return (par1IBlockAccess.getBlockMetadata(par2, par3, par4) & 8) == 0 ? false : par5 == 1;
    076        }
    077
    078        /**
    079         * Update the detector rail power state if a minecart enter, stays or leave the block.
    080         */
    081        private void setStateIfMinecartInteractsWithRail(World par1World, int par2, int par3, int par4, int par5)
    082        {
    083            boolean var6 = (par5 & 8) != 0;
    084            boolean var7 = false;
    085            float var8 = 0.125F;
    086            List var9 = par1World.getEntitiesWithinAABB(EntityMinecart.class, AxisAlignedBB.getAABBPool().addOrModifyAABBInPool((double)((float)par2 + var8), (double)par3, (double)((float)par4 + var8), (double)((float)(par2 + 1) - var8), (double)((float)(par3 + 1) - var8), (double)((float)(par4 + 1) - var8)));
    087
    088            if (!var9.isEmpty())
    089            {
    090                var7 = true;
    091            }
    092
    093            if (var7 && !var6)
    094            {
    095                par1World.setBlockMetadataWithNotify(par2, par3, par4, par5 | 8);
    096                par1World.notifyBlocksOfNeighborChange(par2, par3, par4, this.blockID);
    097                par1World.notifyBlocksOfNeighborChange(par2, par3 - 1, par4, this.blockID);
    098                par1World.markBlocksDirty(par2, par3, par4, par2, par3, par4);
    099            }
    100
    101            if (!var7 && var6)
    102            {
    103                par1World.setBlockMetadataWithNotify(par2, par3, par4, par5 & 7);
    104                par1World.notifyBlocksOfNeighborChange(par2, par3, par4, this.blockID);
    105                par1World.notifyBlocksOfNeighborChange(par2, par3 - 1, par4, this.blockID);
    106                par1World.markBlocksDirty(par2, par3, par4, par2, par3, par4);
    107            }
    108
    109            if (var7)
    110            {
    111                par1World.scheduleBlockUpdate(par2, par3, par4, this.blockID, this.tickRate());
    112            }
    113        }
    114    }