TransformingIterator.java

/**
 * Copyright (C) 2009-2014 FoundationDB, LLC
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.foundationdb.server.spatial;

import java.util.Iterator;

public abstract class TransformingIterator<FROM, TO> implements Iterator<TO>
{
    // Iterator interface

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

    @Override
    public TO next()
    {
        return transform(input.next());
    }

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

    // TransformingIterator interface

    public abstract TO transform(FROM x);

    public TransformingIterator(Iterator<FROM> input)
    {
        this.input = input;
    }

    // Object state

    private final Iterator<FROM> input;
}