org.apache.mahout.common.iterator.CountingIterator Maven / Gradle / Ivy

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.mahout.common.iterator;

import com.google.common.collect.AbstractIterator;

/**
 * Iterates over the integers from 0 through {@code to-1}.
 */
public final class CountingIterator extends AbstractIterator {

  private int count;
  private final int to;

  public CountingIterator(int to) {
    this.to = to;
  }

  @Override
  protected Integer computeNext() {
    if (count < to) {
      return count++;
    } else {
      return endOfData();
    }
  }

}