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• StackQueue.java

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org.jbox2d.particle.StackQueue Maven / Gradle / Ivy

package org.jbox2d.particle;


public class StackQueue {

    private T[] m_buffer;
    private int m_front;
    private int m_back;
    private int m_end;

    public StackQueue() {
    }

    public void reset(T[] buffer) {
        m_buffer = buffer;
        m_front = 0;
        m_back = 0;
        m_end = buffer.length;
    }

    public void push(T task) {
        if (m_back >= m_end) {
            System.arraycopy(m_buffer, m_front, m_buffer, 0, m_back - m_front);
            m_back -= m_front;
            m_front = 0;
            if (m_back >= m_end) {
                return;
            }
        }
        m_buffer[m_back++] = task;
    }

    public T pop() {
        assert (m_front < m_back);
        return m_buffer[m_front++];
    }

    public boolean empty() {
        return m_front >= m_back;
    }

    public T front() {
        return m_buffer[m_front];
    }
}