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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

There is a newer version: 9.1.6

package proguard.util;

/** A circular buffer over the primitive integer type. */
public class CircularIntBuffer {
  private final int[] buffer;
  private int head;
  private int curSize;

  /** Create a new CircularIntBuffer that can grow to a given maxSize. */
  public CircularIntBuffer(int maxSize) {
    buffer = new int[maxSize];
    head = 0;
  }

  /** Push a value into the buffer overriding the oldest element when exceeding max size. */
  public void push(int value) {
    head = (head + 1) % buffer.length;
    buffer[head] = value;
    if (curSize < buffer.length) {
      curSize++;
    }
  }

  /** Get the element at an offset of the head. */
  public int peek(int offset) {
    if (offset >= curSize) {
      throw new IndexOutOfBoundsException(
          "Offset [" + offset + "] out of bounds for buffer of size " + curSize + ".");
    }
    return buffer[Math.floorMod(head - offset, buffer.length)];
  }

  /** Get the head value. */
  public int peek() {
    return peek(0);
  }

  /** Get current size of the buffer. */
  public int size() {
    return curSize;
  }
}