/* * Copyright (c) 2002-2003 by OpenSymphony * All rights reserved. */package com.opensymphony.workflow.util.beanshell;import bsh.Interpreter;import bsh.TargetError;import com.opensymphony.module.propertyset.PropertySet;import com.opensymphony.workflow.*;import com.opensymphony.workflow.spi.WorkflowEntry;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import java.util.Map;/** * Beanshell inline script validator. * The input is determined to be invalid of the script throws a  {@link InvalidInputException}. */public class BeanShellValidator implements Validator {    //~ Static fields/initializers /////////////////////////////////////////////    private static final Log log = LogFactory.getLog(BeanShellValidator.class);    //~ Methods ////////////////////////////////////////////////////////////////    public void validate(Map transientVars, Map args, PropertySet ps) throws WorkflowException {        Interpreter i = new Interpreter();        ClassLoader loader = Thread.currentThread().getContextClassLoader();        try {            String contents = (String) args.get(AbstractWorkflow.BSH_SCRIPT);            WorkflowContext context = (WorkflowContext) transientVars.get("context");            WorkflowEntry entry = (WorkflowEntry) transientVars.get("entry");            if (loader != null) {                i.setClassLoader(loader);            }            i.set("entry", entry);            i.set("context", context);            i.set("transientVars", transientVars);            i.set("propertySet", ps);            Object o = i.eval(contents);            if (o != null) {                throw new InvalidInputException(o);            }        } catch (TargetError e) {            if (e.getTarget() instanceof WorkflowException) {                throw (WorkflowException) e.getTarget();            } else {                throw new WorkflowException("Unexpected exception in beanshell validator script:" + e.getMessage(), e);            }        } catch (Exception e) {            String message = "Error executing beanshell validator";            throw new WorkflowException(message, e);        } finally {            if (loader != null) {                i.setClassLoader(null);            }        }    }}