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    }