com.puresoltechnologies.streaming.ConvertingStreamIterator Maven / Gradle / Ivy

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package com.puresoltechnologies.streaming;

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

/**
 * This is a special decorator for {@link Iterator} to convert the iterator
 * elements into a new type.
 * 
 * @author Rick-Rainer Ludwig
 *
 * @param 
 *            is the element type of the base iterator.
 * @param 
 *            is the element type of this iterator.
 */
public class ConvertingStreamIterator extends AbstractStreamIterator {

    private final Iterator origin;
    private final Function converter;

    public ConvertingStreamIterator(Iterator origin, Function converter) {
	Objects.requireNonNull(origin, "Origin iterator must not be null");
	Objects.requireNonNull(converter, "Converter must not be null");
	this.origin = origin;
	this.converter = converter;
    }

    @Override
    protected F findNext() {
	if (origin.hasNext()) {
	    T next = origin.next();
	    return converter.apply(next);
	}
	return null;
    }

}