001 package net.minecraft.block;
002
003 import java.util.List;
004 import java.util.Random;
005 import net.minecraft.entity.Entity;
006 import net.minecraft.entity.item.EntityMinecart;
007 import net.minecraft.util.AxisAlignedBB;
008 import net.minecraft.world.IBlockAccess;
009 import net.minecraft.world.World;
010
011 public 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 }