dynamichandler.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: DynamicHandler.java,v 1.13 2005/05/17 16:41:00 jmettraux Exp $
 */

//
// DynamicHandler.java
//
// [e-mail]
//
// generated with 
// jtmpl 1.0.04 31.10.2002 John Mettraux ([e-mail])
//

package openwfe.org.uman.web;

import javax.servlet.http.HttpServletRequest;
import openwfe.org.ReflectionUtils;
import openwfe.org.auth.AuthException;
import openwfe.org.uman.web.actions.EditItemAction;


/**
 * A handler configured dynamically from WEB-INF/handlers.xml
 *
 * <p><font size=2>CVS Info :
 * <br>$Author: jmettraux $
 * <br>$Date: 2005/05/17 16:41:00 $
 * <br>$Id: DynamicHandler.java,v 1.13 2005/05/17 16:41:00 jmettraux Exp $ </font>
 *
 * @author [e-mail]
 */
public class DynamicHandler

    implements Handler

{

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

    //
    // CONSTANTS & co

    //
    // FIELDS

    protected Class handledClass = null;
    protected java.util.List fieldList = null;

    //
    // CONSTRUCTORS

    public DynamicHandler ()
    {
        super();

        this.fieldList = new java.util.ArrayList(5);
    }

    //
    // METHODS from Handler

    public Object updateFromRequest (Object object, HttpServletRequest req)
        throws WumanException
    {
        java.util.Map initParams = new java.util.HashMap(5);

        java.util.Iterator it = this.fieldList.iterator();
        while (it.hasNext())
        {
            Field f = (Field)it.next();
            initParams.put(f.getName(), f.parseRequestValues(req));

            log.debug
                ("initParams.put(\""+f.getName()+
                 "\", \""+f.parseRequestValues(req)+"\")");
        }

        if (object == null)
            //
            // new instance
        {
            try
            {
                return newInstance(initParams);
            }
            catch (Exception e)
            {
                throw new WumanException
                    ("Failed to create new instance of"+
                     this.handledClass.getName(), 
                     e);
            }
        }

        try
        {
            //return ReflectionUtils.initObject(object, initParams);
            return update(object, initParams);
        }
        catch (Exception e)
        {
            throw new WumanException
                ("Failed to init resulting object", e);
        }
    }

    protected Object update 
        (final Object o, final java.util.Map updateParams)
    throws
        Exception
    {
        if ( ! (o instanceof openwfe.org.auth.Permission))
            return ReflectionUtils.initObject(o, updateParams);

        return ReflectionUtils.buildInstance(this.handledClass, updateParams);
    }

    protected Object newInstance (final java.util.Map initParams)
        throws Exception
    {
        if (openwfe.org.auth.Permission.class
                .isAssignableFrom(this.handledClass))
        {
            return ReflectionUtils.buildInstance(this.handledClass, initParams);
        }

        Object result = this.handledClass.newInstance();
        ReflectionUtils.initObject(result, initParams);

        return result;
    }

    public void loadInRequest (Object object, HttpServletRequest req)
        throws WumanException
    {
        String className = "no class";
        if (object != null)
        {
            if (object instanceof String)
                className = (String)object;
            else
                className = object.getClass().getName();
        }

        FieldSet fs = new FieldSet(className);

        java.util.Iterator it = this.fieldList.iterator();
        while (it.hasNext())
        {
            Field f = (Field)((Field)it.next()).clone();

            if (object != null && ! (object instanceof String)) 
            {
                f.setValue(object);
            }

            fs.addField(f);
        }

        req.getSession().setAttribute(FieldSet.FIELD_SET, fs);
    }

    //
    // METHODS

    public void setHandledClass (Class c)
    {
        this.handledClass = c;
    }

    public void addField (Field f)
    {
        this.fieldList.add(f);
    }

}