/*
 * 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.kafka.common.utils;

import java.util.Iterator;
import java.util.function.Function;

/**
 * An iterator that maps another iterator's elements from type `F` to type `T`.
 */
public final class MappedIterator<F, T> implements Iterator<T> {
    private final Iterator<? extends F> underlyingIterator;
    private final Function<F, T> mapper;

    public MappedIterator(Iterator<? extends F> underlyingIterator, Function<F, T> mapper) {
        this.underlyingIterator = underlyingIterator;
        this.mapper = mapper;
    }

    @Override
    public boolean hasNext() {
        return underlyingIterator.hasNext();
    }

    @Override
    public T next() {
        return mapper.apply(underlyingIterator.next());
    }

}
