iteratorexpression.java

一个工作流设计及定义的系统,可以直接与数据库结合进行系统工作流程的定义及应用.

/*
 * Copyright (c) 2005, John Mettraux, OpenWFE.org
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 * . Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.  
 * 
 * . 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.
 * 
 * . Neither the name of the "OpenWFE" nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
 *
 * $Id: IteratorExpression.java,v 1.9 2005/05/17 16:40:23 jmettraux Exp $
 */

//
// IteratorExpression.java
//
// [e-mail]
//
// generated with 
// jtmpl 1.0.04 20.11.2001 John Mettraux ([e-mail])
//

package openwfe.org.engine.expressions;

import openwfe.org.OpenWfeException;
import openwfe.org.engine.workitem.InFlowWorkItem;


/**
 * A sequential iterator (exactly like a 'for' in java or c)
 *
 * <p><font size=2>CVS Info :
 * <br>$Author: jmettraux $
 * <br>$Date: 2005/05/17 16:40:23 $
 * <br>$Id: IteratorExpression.java,v 1.9 2005/05/17 16:40:23 jmettraux Exp $ </font>
 *
 * @author [e-mail]
 */
public class IteratorExpression

    extends OneChildExpression

{

    private final static org.apache.log4j.Logger log = org.apache.log4j.Logger
        .getLogger(IteratorExpression.class.getName());

    //
    // CONSTANTS & co

    //
    // FIELDS

    private Iterator iterator = null;

    //
    // CONSTRUCTORS

    //
    // BEAN METHODS

    /**
     * Returns the iterator attached to this iteratorExpression.
     */
    public Iterator getIterator () { return this.iterator; }

    /**
     * Sets the iterator attached to this iteratorExpression.
     */
    public void setIterator (Iterator i) { this.iterator = i; }

    //
    // METHODS from FlowExpression

    public void apply (final InFlowWorkItem wi) 
        throws ApplyException
    {
        this.iterator = new Iterator(this, wi);

        try
        {
            this.iterator.next(this, wi);

            this.storeItself();
        }
        catch (final OpenWfeException owe)
        {
            throw new ApplyException
                ("Failed to iterate to first element", owe);
        }
    }

    public void reply (InFlowWorkItem wi)
        throws ReplyException
    {
        try
        {
            if (this.iterator.hasNext()) 
            {
                log.debug("reply() iterator has next");

                this.iterator.next(this, wi);

                this.storeItself();
            }
            else
            {
                log.debug("reply() iterator hasn't next : replying to parent");

                replyToParent(wi);
            }
        }
        catch (Exception e)
        {
            throw new ReplyException
                ("Failed to iterate to next element", e);
        }
    }

    /*
    public Object clone ()
    {
        IteratorExpression result = new IteratorExpression();

        result.setId(getId().copy());

        if (getParent() != null)
            result.setParent(getParent().copy());

        result.setAttributes(this.getAttributes());

        if (this.getChildExpressionId() != null)
            result.setChildExpressionId(this.getChildExpressionId().copy());

        // the rest is fetched from attributes

        return result;
    }
    */

    //
    // METHODS

}