package net.minecraft.util;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableList.Builder;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReferenceArray;

public class DebugBuffer<T> {

    private final AtomicReferenceArray<T> data;
    private final AtomicInteger index;

    public DebugBuffer(int i) {
        this.data = new AtomicReferenceArray(i);
        this.index = new AtomicInteger(0);
    }

    public void a(T t0) {
        int i = this.data.length();

        int j;
        int k;

        do {
            j = this.index.get();
            k = (j + 1) % i;
        } while (!this.index.compareAndSet(j, k));

        this.data.set(k, t0);
    }

    public List<T> a() {
        int i = this.index.get();
        Builder<T> builder = ImmutableList.builder();

        for (int j = 0; j < this.data.length(); ++j) {
            int k = Math.floorMod(i - j, this.data.length());
            T t0 = this.data.get(k);

            if (t0 != null) {
                builder.add(t0);
            }
        }

        return builder.build();
    }
}