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The "JANINO" implementation of the "commons-compiler" API: Super-small, super-fast, independent from the JDK's "tools.jar".

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/*
 * Janino - An embedded Java[TM] compiler
 *
 * Copyright (c) 2001-2010, Arno Unkrig
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 *
 *    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 notice, this list of conditions and the
 *       following disclaimer in the documentation and/or other materials provided with the distribution.
 *    3. The name of the author may not be used to endorse or promote products derived from this software without
 *       specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package org.codehaus.janino.util;

import org.codehaus.commons.nullanalysis.Nullable;

/**
 * An object that produces some {@link java.lang.Object} each time the {@link #produce()} method is invoked. This
 * behavior is similar to the {@link java.util.Iterator}, but is represented by one single {@link #produce()} method as
 * opposed to {@link java.util.Iterator}'s two methods {@link java.util.Iterator#hasNext()} and {@link
 * java.util.Iterator#next()}. This simplifies the implementation of certain complex iterations.
 *
 * @param  The type of the products
 * @see       org.codehaus.janino.util.iterator.DirectoryIterator
 * @see       org.codehaus.janino.util.iterator.ProducerIterator
 */
public
interface Producer {

    /**
     * Produces the next object.
     *
     * @return the next object or {@code null} to indicate that no more objects can be produced
     */
    @Nullable T produce();
}