src/main/java/org/apache/giraph/utils/UnmodifiableIntArrayIterator.java

/*
 * 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.giraph.utils;

import com.google.common.collect.UnmodifiableIterator;
import org.apache.hadoop.io.IntWritable;

/**
 * {@link UnmodifiableIterator} over a primitive int array
 */
public class UnmodifiableIntArrayIterator
        extends UnmodifiableIterator<IntWritable> {

    private final int[] arr;
    private int offset;

    public UnmodifiableIntArrayIterator(int[] arr) {
        this.arr = arr;
        offset = 0;
    }

    @Override
    public boolean hasNext() {
        return offset < arr.length;
    }

    @Override
    public IntWritable next() {
        return new IntWritable(arr[offset++]);
    }
}