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/*
 * Copyright 2015-16, Yahoo! Inc.
 * Licensed under the terms of the Apache License 2.0. See LICENSE file at the project root for terms.
 */

package com.yahoo.sketches.hll;

/**
 * @author Kevin Lang
 */
public final class CompositeBucketIterator implements BucketIterator {
  private final BucketIterator[] iters;

  private int index = 0;

  /**
   * Constructs with given list (or array) of iterators
   * @param iters the given list (or array) of iterators
   */
  public CompositeBucketIterator(BucketIterator... iters) {
    this.iters = iters;
  }

  @Override
  public boolean next() {
    while (index < iters.length && !iters[index].next()) {
      iters[index] = null; // give up the reference
      ++index;
    }
    return index < iters.length;
  }

  @Override
  public int getKey() {
    return iters[index].getKey();
  }

  @Override
  public byte getValue() {
    return iters[index].getValue();
  }
}