processdefinition.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: ProcessDefinition.java,v 1.19 2005/05/17 16:40:23 jmettraux Exp $
 */

//
// ProcessDefinition.java
//
// [e-mail]
//
// generated with 
// jtmpl 1.1.01 2004/05/19 ([e-mail])
//

package openwfe.org.engine.expressions;

import openwfe.org.ApplicationContext;
import openwfe.org.xml.XmlUtils;
import openwfe.org.engine.workitem.InFlowWorkItem;
import openwfe.org.engine.expressions.raw.RawExpression;


/**
 * This class is only used by droflo for flow edition.
 *
 * <p><font size=2>CVS Info :
 * <br>$Author: jmettraux $
 * <br>$Id: ProcessDefinition.java,v 1.19 2005/05/17 16:40:23 jmettraux Exp $ </font>
 *
 * @author [e-mail]
 */
public class ProcessDefinition

    extends AbstractCompositeFlowExpression

{

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

    //
    // CONSTANTS & co

    //
    // FIELDS

    private java.util.Map expressions = new java.util.HashMap(10);

    private DefineExpression self = null;

    //
    // CONSTRUCTORS

    /*
    public ProcessDefinition ()
    {
        super();

        log.debug("ProcessDefinition(0)");
    }
    */

    public ProcessDefinition
        (final ApplicationContext context,
         final DefineExpression definition)
    throws 
        BuildException
    {
        super();

        log.debug("ProcessDefinition(1)");

        setApplicationContext(context);
        //setParentDefinition(parentDefinition);

        log.debug
            ("ProcessDefinition() definition : "+
             definition.getClass().getName()+"  "+
             definition.getId());

        this.setSelf(definition);

        this.setId(definition.getId());

        log.debug("ProcessDefinition() set ProcessDefinition id to "+getId());
    }

    public ProcessDefinition 
        (final ApplicationContext context,
         final String wfdUrl,
         final String wfdName,
         final String wfdRevision)
    throws 
        BuildException
    {
        super();

        log.debug("ProcessDefinition(2)");

        setApplicationContext(context);

        final FlowExpressionId id = new FlowExpressionId();

        id.setWorkflowDefinitionUrl(wfdUrl);
        id.setWorkflowDefinitionName(wfdName);
        id.setWorkflowDefinitionRevision(wfdRevision);

        setId(id);

        // 
        // creating 'self'

        final DefineExpression de = new DefineExpression();

        final java.util.Map deParams = new java.util.HashMap();
        deParams.put("name", wfdName);
        deParams.put("revision", wfdRevision);

        de.init(context(), null, getId(), null, deParams, null);

        setSelf(de);
    }

    //
    // BEAN METHODS

    public java.util.Map getExpressions ()
    {
        return this.expressions;
    }

    /**
     * 'self' is the DefineExpression at the root of the ProcessDefinition
     * (usually a workflow-definition).
     */
    public DefineExpression getSelf ()
    {
        return this.self;
    }

    public void setExpressions (final java.util.Map m)
    {
        this.expressions = m;
    }

    public void setSelf (final DefineExpression self)
    {
        this.self = self;
    }

    //
    // METHODS from CompositeFlowExpression

    /**
     * Overrides the method as found in removeChild()
     */
    public void removeChild (final FlowExpressionId fei)
    {
        getExpressions().remove(fei);

        final java.util.Iterator it = getExpressions().values().iterator();
        while (it.hasNext())
        {
            final Object o = it.next();

            if (o instanceof CompositeFlowExpression)
            {
                final CompositeFlowExpression cfe = (CompositeFlowExpression)o;

                cfe.getChildren().remove(fei);
            }
            else if (o instanceof OneChildExpression)
            {
                final OneChildExpression oce = (OneChildExpression)o;

                if (oce.getChildExpressionId().equals(fei))
                    oce.setChildExpressionId(null);
            }
        }
    }

    //
    // METHODS

    public FlowExpression get (final FlowExpressionId fei)
    {
        //log.debug("get() trying to get "+fei);

        return (FlowExpression)getExpressions().get(fei);
    }

    public void add (final FlowExpression fe)
    {
        addChild(fe.getId());
        getExpressions().put(fe.getId(), fe);
        log.debug("put child "+fe.getId()+"  add(1)");
    }

    /**
     * Adds a new expression as a child of the given 'parent', this method is
     * a droflo edition method.
     */
    public void add 
        (final String expressionName, final FlowExpressionId parentId)
    throws
        BuildException
    {
        FlowExpression parent = null;

        if (parentId != null)
            parent = (FlowExpression)getExpressions().get(parentId);
        else
            parent = getSelf();

        final FlowExpression fe = getExpressionMap()
            .instantiateExpression(expressionName);

        final FlowExpressionId id = parent.getId().copy();
        
        final int c = newChildId(parent);
        if (c < 0)
        {
            throw new BuildException
                ("Cannot add child to an expression of class "+
                 parent.getClass());
        }

        id.setExpressionName(expressionName);
        id.setExpressionId(parent.getId().getExpressionId()+"."+c);

        fe.setId(id);
        fe.setParent(parentId);

        // add child in this definition
        
        getExpressions().put(fe.getId(), fe);
        log.debug("put child "+fe.getId()+"  add(2)");

        // add child to parent

        addChild(parent, fe.getId());
    }

    /*
     * Adds a child to a parent expression
     */
    private void addChild 
        (final FlowExpression parent, final FlowExpressionId childId)
    {
        if (parent instanceof CompositeFlowExpression)
        {
            ((CompositeFlowExpression)parent).addChild(childId);
        }
        else if (parent instanceof OneChildExpression)
        {
            ((OneChildExpression)parent).setChildExpressionId(childId);
        }
                 
    }

    /*
     * Returns the last int id in the expression id, ie for "0.4.5" will 
     * return "5".
     */
    private int getChildId (final FlowExpressionId fei)
    {
        int i = fei.getExpressionId().lastIndexOf(".");

        if (i < 0) return Integer.parseInt(fei.getExpressionId());

        return Integer.parseInt(fei.getExpressionId().substring(i+1));
    }