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Java example source code file (RecordIterator.java)

This example Java source code file (RecordIterator.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

ilookup, ipersistentvector, iterator, object, recorditerator, unsupportedoperationexception, util

The RecordIterator.java Java example source code

/**
 * Copyright (c) Rich Hickey. All rights reserved.
 * The use and distribution terms for this software are covered by the
 * Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
 * which can be found in the file epl-v10.html at the root of this distribution.
 * By using this software in any fashion, you are agreeing to be bound by
 * the terms of this license.
 * You must not remove this notice, or any other, from this software.
 */

/* ghadi shayban Sep 24, 2014 */

package clojure.lang;

import java.util.Iterator;

public final class RecordIterator implements Iterator {

    int i = 0;
    final int basecnt;
    final ILookup rec;
    final IPersistentVector basefields;
    final Iterator extmap;

    public RecordIterator (ILookup rec, IPersistentVector basefields, Iterator extmap) {
        this.rec = rec;
        this.basefields = basefields;
        this.basecnt = basefields.count();
        this.extmap = extmap;
    }

    public boolean hasNext() {
        if (i < basecnt) {
            return true;
        } else {
            return extmap.hasNext();
        }
    }

    public Object next() {
        if (i < basecnt) {
            Object k = basefields.nth(i);
            i++;
            return MapEntry.create(k, rec.valAt(k));
        } else  {
            return extmap.next();
        }
    }

    public void remove() {
        throw new UnsupportedOperationException();
    }
}

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