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JHotDraw8 Immutable Collections

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/*
 * @(#)MappedIterator.java
 * Copyright © 2023 The authors and contributors of JHotDraw. MIT License.
 */

package org.jhotdraw8.icollection.impl.iteration;


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

/**
 * Maps an {@link Iterator} to a different element type.
 * 
 * The underlying iterator is referenced - not copied.
 *
 * @param  the mapped element type
 * @param  the original element type
 * @author Werner Randelshofer
 */
public class MappedIterator implements Iterator {
    private final Iterator i;

    private final Function mappingFunction;

    public MappedIterator(Iterator i, Function mappingFunction) {
        this.i = i;
        this.mappingFunction = mappingFunction;
    }

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

    @Override
    public E next() {
        return mappingFunction.apply(i.next());
    }

    @Override
    public void remove() {
        i.remove();
    }
}