/* * Copyright (c) 2002-2003 by OpenSymphony * All rights reserved. */package com.opensymphony.workflow.util.bsf;import com.opensymphony.module.propertyset.PropertySet;import com.opensymphony.util.TextUtils;import com.opensymphony.workflow.AbstractWorkflow;import com.opensymphony.workflow.InvalidInputException;import com.opensymphony.workflow.Validator;import com.opensymphony.workflow.WorkflowContext;import com.opensymphony.workflow.WorkflowException;import com.opensymphony.workflow.spi.WorkflowEntry;import org.apache.bsf.BSFEngine;import org.apache.bsf.BSFManager;import java.util.Map;/** * Validates a step using a BSF script. * * @author $Author: hani $ * @version $Revision: 1.5 $ */public class BSFValidator implements Validator {    //~ Methods ////////////////////////////////////////////////////////////////    public void validate(Map transientVars, Map args, PropertySet ps) throws WorkflowException {        String language = (String) args.get(AbstractWorkflow.BSF_LANGUAGE);        String source = (String) args.get(AbstractWorkflow.BSF_SOURCE);        int row = TextUtils.parseInt((String) args.get(AbstractWorkflow.BSF_ROW));        int col = TextUtils.parseInt((String) args.get(AbstractWorkflow.BSF_COL));        String script = (String) args.get(AbstractWorkflow.BSF_SCRIPT);        WorkflowContext context = (WorkflowContext) transientVars.get("context");        WorkflowEntry entry = (WorkflowEntry) transientVars.get("entry");        BSFManager mgr = new BSFManager();        ClassLoader loader = Thread.currentThread().getContextClassLoader();        if (loader != null) {            mgr.setClassLoader(loader);        }        mgr.registerBean("entry", entry);        mgr.registerBean("context", context);        mgr.registerBean("transientVars", transientVars);        mgr.registerBean("propertySet", ps);        try {            BSFEngine engine = mgr.loadScriptingEngine(language);            Object o = engine.eval(source, row, col, script);            if (o != null) {                throw new InvalidInputException(o);            }        } catch (Exception e) {            String message = "Could not execute BSF validator";            throw new WorkflowException(message, e);        }    }}