/**
* Copyright (c) 2011-2014, SpaceToad and the BuildCraft Team
* http://www.mod-buildcraft.com
*
* BuildCraft is distributed under the terms of the Minecraft Mod Public
* License 1.0, or MMPL. Please check the contents of the license located in
* http://www.mod-buildcraft.com/MMPL-1.0.txt
*/
package buildcraft.core;
import java.util.BitSet;
import java.util.Random;
import net.minecraft.nbt.NBTTagCompound;
import buildcraft.api.core.BlockIndex;
import buildcraft.api.core.NetworkData;
import buildcraft.core.utils.BitSetUtils;
public class ZoneChunk {
@NetworkData
public BitSet property;
@NetworkData
private boolean fullSet = false;
public ZoneChunk() {
}
public boolean get(int xChunk, int zChunk) {
if (fullSet) {
return true;
} else if (property == null) {
return false;
} else {
return property.get(xChunk + zChunk * 16);
}
}
public void set(int xChunk, int zChunk, boolean value) {
if (value) {
if (fullSet) {
return;
}
if (property == null) {
property = new BitSet(16 * 16);
}
property.set(xChunk + zChunk * 16, value);
if (property.cardinality() >= 16 * 16) {
property = null;
fullSet = true;
}
} else {
if (fullSet) {
property = new BitSet(16 * 16);
property.flip(0, 16 * 16 - 1);
fullSet = false;
} else if (property == null) {
// Note - ZonePlan should usually destroy such chunks
property = new BitSet(16 * 16);
}
property.set(xChunk + zChunk * 16, value);
}
}
public void writeToNBT(NBTTagCompound nbt) {
nbt.setBoolean("fullSet", fullSet);
if (property != null) {
nbt.setByteArray("bits", BitSetUtils.toByteArray(property));
}
}
public void readFromNBT(NBTTagCompound nbt) {
fullSet = nbt.getBoolean("fullSet");
if (nbt.hasKey("bits")) {
property = BitSetUtils.fromByteArray(nbt.getByteArray("bits"));
}
}
public BlockIndex getRandomBlockIndex(Random rand) {
int x, z;
if (fullSet) {
x = rand.nextInt(16);
z = rand.nextInt(16);
} else {
int bitId = rand.nextInt(property.cardinality());
int bitPosition = property.nextSetBit(0);
while (bitId > 0) {
bitId--;
bitPosition = property.nextSetBit(bitPosition);
}
z = bitPosition / 16;
x = bitPosition - 16 * z;
}
return new BlockIndex(x, 0, z);
}
public boolean isEmpty() {
return !fullSet && property.isEmpty();
}
}