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package gtPlusPlus.core.util;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.Arrays;
import net.minecraft.nbt.NBTTagCompound;
public class MovingAverageLong {
private final long[] storage;
private int ptr;
public MovingAverageLong(int sampleSize) {
storage = new long[sampleSize];
}
public void set(long average) {
Arrays.fill(storage, average);
}
public void sample(long data) {
storage[ptr] = data;
ptr = (ptr + 1) % storage.length;
}
public long get() {
BigInteger result = BigInteger.ZERO;
for (long l : storage) {
result = result.add(BigInteger.valueOf(l));
}
return result.divide(BigInteger.valueOf(storage.length))
.longValue();
}
public void write(NBTTagCompound tagCompound, String key) {
ByteBuffer buf = ByteBuffer.allocate(storage.length * Long.BYTES)
.order(ByteOrder.nativeOrder());
buf.asLongBuffer()
.put(storage);
tagCompound.setByteArray(key, buf.array());
}
/**
* if read failed, the internal states would not be changed.
*
* @return true if successful, false otherwise.
*/
public boolean read(NBTTagCompound tagCompound, String key) {
ByteBuffer buf = ByteBuffer.wrap(tagCompound.getByteArray(key));
if (buf.remaining() != storage.length * Long.BYTES)
// not very good...
return false;
buf.asLongBuffer()
.get(storage);
return true;
}
}
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