src/main/java/freemarker/template/TemplateModelIterator.java

/*
 * Copyright (c) 2003 The Visigoth Software Society. All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
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 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Visigoth Software Society (http://www.visigoths.org/)."
 *    Alternately, this acknowledgement may appear in the software itself,
 *    if and wherever such third-party acknowledgements normally appear.
 *
 * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the 
 *    project contributors may be used to endorse or promote products derived
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 * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
 *    nor may "FreeMarker" or "Visigoth" appear in their names
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Visigoth Software Society. For more
 * information on the Visigoth Software Society, please see
 * http://www.visigoths.org/
 */

package freemarker.template;

/**
 * Used to iterate over a set of template models <em>once</em>; usually returned from
 * {@link TemplateCollectionModel#iterator()}. Note that it's not a {@link TemplateModel}.
 * 
 * @author Attila Szegedi, szegedia at users dot sourceforge dot net
 */
public interface TemplateModelIterator {

    /**
     * Returns the next model.
     * @throws TemplateModelException if the next model can not be retrieved
     *   (i.e. because the iterator is exhausted).
     */
    TemplateModel next() throws TemplateModelException;

    /**
     * @return whether there are any more items to iterate over.
     */
    boolean hasNext() throws TemplateModelException;
}