001package net.minecraft.block;
002
003import java.util.List;
004import java.util.Random;
005import net.minecraft.entity.Entity;
006import net.minecraft.entity.item.EntityMinecart;
007import net.minecraft.util.AxisAlignedBB;
008import net.minecraft.world.IBlockAccess;
009import net.minecraft.world.World;
010
011public class BlockDetectorRail extends BlockRail
012{
013    public BlockDetectorRail(int par1, int par2)
014    {
015        super(par1, par2, true);
016        this.setTickRandomly(true);
017    }
018
019    /**
020     * How many world ticks before ticking
021     */
022    public int tickRate()
023    {
024        return 20;
025    }
026
027    /**
028     * Can this block provide power. Only wire currently seems to have this change based on its state.
029     */
030    public boolean canProvidePower()
031    {
032        return true;
033    }
034
035    /**
036     * Triggered whenever an entity collides with this block (enters into the block). Args: world, x, y, z, entity
037     */
038    public void onEntityCollidedWithBlock(World par1World, int par2, int par3, int par4, Entity par5Entity)
039    {
040        if (!par1World.isRemote)
041        {
042            int var6 = par1World.getBlockMetadata(par2, par3, par4);
043
044            if ((var6 & 8) == 0)
045            {
046                this.setStateIfMinecartInteractsWithRail(par1World, par2, par3, par4, var6);
047            }
048        }
049    }
050
051    /**
052     * Ticks the block if it's been scheduled
053     */
054    public void updateTick(World par1World, int par2, int par3, int par4, Random par5Random)
055    {
056        if (!par1World.isRemote)
057        {
058            int var6 = par1World.getBlockMetadata(par2, par3, par4);
059
060            if ((var6 & 8) != 0)
061            {
062                this.setStateIfMinecartInteractsWithRail(par1World, par2, par3, par4, var6);
063            }
064        }
065    }
066
067    /**
068     * Returns true if the block is emitting indirect/weak redstone power on the specified side. If isBlockNormalCube
069     * returns true, standard redstone propagation rules will apply instead and this will not be called. Args: World, X,
070     * Y, Z, side. Note that the side is reversed - eg it is 1 (up) when checking the bottom of the block.
071     */
072    public boolean isProvidingWeakPower(IBlockAccess par1IBlockAccess, int par2, int par3, int par4, int par5)
073    {
074        return (par1IBlockAccess.getBlockMetadata(par2, par3, par4) & 8) != 0;
075    }
076
077    /**
078     * Returns true if the block is emitting direct/strong redstone power on the specified side. Args: World, X, Y, Z,
079     * side. Note that the side is reversed - eg it is 1 (up) when checking the bottom of the block.
080     */
081    public boolean isProvidingStrongPower(IBlockAccess par1IBlockAccess, int par2, int par3, int par4, int par5)
082    {
083        return (par1IBlockAccess.getBlockMetadata(par2, par3, par4) & 8) == 0 ? false : par5 == 1;
084    }
085
086    /**
087     * Update the detector rail power state if a minecart enter, stays or leave the block.
088     */
089    private void setStateIfMinecartInteractsWithRail(World par1World, int par2, int par3, int par4, int par5)
090    {
091        boolean var6 = (par5 & 8) != 0;
092        boolean var7 = false;
093        float var8 = 0.125F;
094        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)));
095
096        if (!var9.isEmpty())
097        {
098            var7 = true;
099        }
100
101        if (var7 && !var6)
102        {
103            par1World.setBlockMetadataWithNotify(par2, par3, par4, par5 | 8);
104            par1World.notifyBlocksOfNeighborChange(par2, par3, par4, this.blockID);
105            par1World.notifyBlocksOfNeighborChange(par2, par3 - 1, par4, this.blockID);
106            par1World.markBlockRangeForRenderUpdate(par2, par3, par4, par2, par3, par4);
107        }
108
109        if (!var7 && var6)
110        {
111            par1World.setBlockMetadataWithNotify(par2, par3, par4, par5 & 7);
112            par1World.notifyBlocksOfNeighborChange(par2, par3, par4, this.blockID);
113            par1World.notifyBlocksOfNeighborChange(par2, par3 - 1, par4, this.blockID);
114            par1World.markBlockRangeForRenderUpdate(par2, par3, par4, par2, par3, par4);
115        }
116
117        if (var7)
118        {
119            par1World.scheduleBlockUpdate(par2, par3, par4, this.blockID, this.tickRate());
120        }
121    }
122}