net.unit8.moshas.dom.RenderingId Maven / Gradle / Ivy

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package net.unit8.moshas.dom;

import java.util.ArrayDeque;
import java.util.concurrent.atomic.AtomicInteger;

/**
 *
 * @author kawasima
 */
public class RenderingId {
    private static final AtomicInteger nextId = new AtomicInteger(1);

    private static final ThreadLocal> renderingId = new ThreadLocal>() {
        @Override
        protected ArrayDeque initialValue() {
            return new ArrayDeque<>(8);
        }
    };
    
    public static int push() {
        Integer id = nextId.incrementAndGet();
        renderingId.get().addFirst(id);
        return id;
    }
    
    public static int get() {
        ArrayDeque deque = renderingId.get();
        return deque.isEmpty() ? 0 : deque.getFirst();
    }
    
    public static int pop() {
        return renderingId.get().removeFirst();
    }
}