jndiregister.java

一个很好实用的工作流OSWORKFLOW开发例子.有着非常优秀的灵活性.

/*
 * Copyright (c) 2002-2003 by OpenSymphony
 * All rights reserved.
 */
package com.opensymphony.workflow.util.jndi;

import com.opensymphony.module.propertyset.PropertySet;

import com.opensymphony.workflow.*;
import com.opensymphony.workflow.spi.WorkflowEntry;

import java.util.Map;

import javax.naming.InitialContext;
import javax.naming.NamingException;


/**
 * Invoke a register registred in JNDI.
 * Args must contain a {@link AbstractWorkflow#JNDI_LOCATION} key.
 * @author $Author: hani $
 * @version $Revision: 1.5 $
 */
public class JNDIRegister implements Register {
    //~ Methods ////////////////////////////////////////////////////////////////

    public Object registerVariable(WorkflowContext context, WorkflowEntry entry, Map args, PropertySet ps) throws WorkflowException {
        String location = (String) args.get(AbstractWorkflow.JNDI_LOCATION);

        if (location == null) {
            throw new WorkflowException(AbstractWorkflow.JNDI_LOCATION + " argument is null");
        }

        Register r;

        try {
            try {
                r = (Register) new InitialContext().lookup(location);
            } catch (NamingException e) {
                //ok, couldn't find it, look in env
                r = (Register) new InitialContext().lookup("java:comp/env/" + location);
            }
        } catch (NamingException e) {
            String message = "Could not look up JNDI register at: " + location;
            throw new WorkflowException(message, e);
        }

        return r.registerVariable(context, entry, args, ps);
    }
}