001    /*
002     * Copyright 1999-2001,2004 The Apache Software Foundation.
003     * 
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     * 
008     *      http://www.apache.org/licenses/LICENSE-2.0
009     * 
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */ 
016    
017    package org.apache.commons.workflow;
018    
019    
020    /**
021     * <p>An <strong>Iterator</strong> is a <code>Block</code> that conditionally
022     * repeats the nested Steps associated with the Block more than once (such as
023     * a Block that implements "while" or "for" functionality).  This is a tagging
024     * interface only - it is useful to help Steps that implement "break" or
025     * "continue" type processing to detect whether they have been invoked
026     * correctly (nested inside an Iterator) or not.</p>
027     *
028     * @version $Revision: 155475 $ $Date: 2005-02-26 13:31:11 +0000 (Sat, 26 Feb 2005) $
029     * @author Craig R. McClanahan
030     */
031    
032    public interface Iterator extends Block {
033    
034    
035        // No extra functionality is defined
036    
037    
038    }