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Stream API from Java 8 rewritten on iterators for Java 7 and below

There is a newer version: 1.2.2

package com.annimon.stream.operator;

import com.annimon.stream.function.ToDoubleFunction;
import com.annimon.stream.iterator.PrimitiveIterator;
import java.util.Iterator;

public class ObjMapToDouble extends PrimitiveIterator.OfDouble {

    private final Iterator iterator;
    private final ToDoubleFunction mapper;

    public ObjMapToDouble(Iterator iterator, ToDoubleFunction mapper) {
        this.iterator = iterator;
        this.mapper = mapper;
    }

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

    @Override
    public double nextDouble() {
        return mapper.applyAsDouble(iterator.next());
    }
}