Examples of bsh.Interpreter

bsh.Interpreter
uate statements and expressions bsh.eval("foo=Math.sin(0.5)"); bsh.eval("bar=foo*5; bar=Math.cos(bar);"); bsh.eval("for(i=0; i<10; i++) { print(\"hello\"); }"); // same as above using java syntax and apis only bsh.eval("for(int i=0; i<10; i++) { System.out.println(\"hello\"); }"); // Source from files or streams bsh.source("myscript.bsh"); // or bsh.eval("source(\"myscript.bsh\")"); // Use set() and get() to pass objects in and out of variables bsh.set( "date", new Date() ); Date date = (Date)bsh.get( "date" ); // This would also work: Date date = (Date)bsh.eval( "date" ); bsh.eval("year = date.getYear()"); Integer year = (Integer)bsh.get("year"); // primitives use wrappers // With Java1.3+ scripts can implement arbitrary interfaces... // Script an awt event handler (or source it from a file, more likely) bsh.eval( "actionPerformed( e ) { print( e ); }"); // Get a reference to the script object (implementing the interface) ActionListener scriptedHandler = (ActionListener)bsh.eval("return (ActionListener)this"); // Use the scripted event handler normally... new JButton.addActionListener( script );
In the above examples we showed a single interpreter instance, however you may wish to use many instances, depending on the application and how you structure your scripts. Interpreter instances are very light weight to create, however if you are going to execute the same script repeatedly and require maximum performance you should consider scripting the code as a method and invoking the scripted method each time on the same interpreter instance (using eval()).
See the BeanShell User's Manual for more information.

public class BeanShellHelloWorld {


  public static void main(String[] args) throws FileNotFoundException, IOException, EvalError {
    
    JButton button = new JButton("HelloWorld");
        button.addActionListener((ActionListener)new Interpreter().source("actionHandler.bsh") );


        JFrame f = new JFrame();
        f.setTitle("BeanShell Test");
        f.setSize(200, 100);
        f.getContentPane().add( button );

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    mainPanel = new JPanel();
    mainPanel.setLayout(new BorderLayout());


    JConsole bshConsole = new JConsole();
    Interpreter interpreter = new Interpreter(bshConsole);


    interpreter.println("Hello World");
    Thread t = new Thread(interpreter);
    t.start();
    
    getContentPane().add(new JSplitPane(JSplitPane.VERTICAL_SPLIT, mainPanel, bshConsole));
  }

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    JSplitPane contentPanel = null;
    if (useConsole) {
      String welcomeMessage = getWelcomeMessage();


      bshConsole = new JConsole();
      Interpreter interpreter = new Interpreter(bshConsole);


      configureInterpreter(interpreter, cacheDelegate);


      interpreter.println(welcomeMessage);
        
      interpreter.setShowResults(!interpreter.getShowResults());// show() in beanShell
      System.setOut(bshConsole.getOut());
      System.setErr(bshConsole.getErr());
      Thread t = new Thread(interpreter);
      t.start();

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    protected Object executeBeanShellScript(String beanShellScript, Map context) throws EvalError {
        // Ensure there is something to execute.
        if (beanShellScript == null || beanShellScript.trim().equals("")) return null;


        // Initialize the BeanShell interpreter.
        Interpreter bshInterpreter = (Interpreter) _bshIntepreterThread.get();
        if (bshInterpreter == null) {
            bshInterpreter = new Interpreter();
            ClassLoader loader = Thread.currentThread().getContextClassLoader();
            if (loader != null) bshInterpreter.setClassLoader(loader);
            _bshIntepreterThread.set(bshInterpreter);
        }


        // Set context.
        Iterator contextIt = context.keySet().iterator();
        while (contextIt.hasNext()) {
            String contextVar = (String) contextIt.next();
            bshInterpreter.set(contextVar, context.get(contextVar));
        }


        // Launch the BeanShell script.
        return bshInterpreter.eval(beanShellScript);
    }

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  public Map eval(Map inputMap, Set outputNames) {
    Map outputMap = new HashMap();
    
    try {
      log.debug("script input: "+inputMap);
      Interpreter interpreter = new Interpreter();
      Iterator iter = inputMap.keySet().iterator();
      while (iter.hasNext()) {
        String inputName = (String) iter.next();
        Object inputValue = inputMap.get(inputName);
        if (inputValue!=null) {
          interpreter.set(inputName, inputValue);
        }
      }
      interpreter.eval(expression);
      iter = outputNames.iterator();
      while (iter.hasNext()) {
        String outputName = (String) iter.next();
        Object outputValue = interpreter.get(outputName);
        outputMap.put(outputName, outputValue);
      }
      log.debug("script output: "+outputMap);
    } catch (EvalError e) {
      throw new JbpmException("can't evaluate beanshell script '"+expression+"'", e);

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              MonitoringPatternBean mpb = list.get(i);
              String object = null;
              ObjectMapper mapper = new ObjectMapper();
              try {
      object = (String) mapper.getObjectFromMessage(message, mpb.getPattern());
      Interpreter inter = new Interpreter();
      inter.eval(BEANSHELL_VARIABLE + " = " + object + mpb.getConditional());
      Boolean b = (Boolean)inter.get(BEANSHELL_VARIABLE);
      if (b.booleanValue()) {
          mvelMonitor.addEvent(message, mpb);
      }
              } catch (ObjectMappingException e1) {
      throw new ActionProcessingException(e1);

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    public String getBoundaryCommentName() {
        return menuLocation + "#" + name;
    }


    public Interpreter getBshInterpreter(Map<String, Object> context) throws EvalError {
        Interpreter bsh = (Interpreter) context.get("bshInterpreter");
        if (bsh == null) {
            bsh = BshUtil.makeInterpreter(context);
            context.put("bshInterpreter", bsh);
        }
        return bsh;

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        public boolean shouldUse(Map<String, Object> context) {
            boolean shouldUse = true;
            String useWhen = this.getUseWhen(context);
            if (UtilValidate.isNotEmpty(useWhen)) {
                try {
                    Interpreter bsh = (Interpreter) context.get("bshInterpreter");
                    if (bsh == null) {
                        bsh = BshUtil.makeInterpreter(context);
                        context.put("bshInterpreter", bsh);
                    }


                    Object retVal = bsh.eval(useWhen);


                    // retVal should be a Boolean, if not something weird is up...
                    if (retVal instanceof Boolean) {
                        Boolean boolVal = (Boolean) retVal;
                        shouldUse = boolVal.booleanValue();

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        String useWhenStr = this.getUseWhen(context);
        if (UtilValidate.isEmpty(useWhenStr)) {
            return true;
        } else {
            try {
                Interpreter bsh = this.modelForm.getBshInterpreter(context);
                Object retVal = bsh.eval(useWhenStr);
                boolean condTrue = false;
                // retVal should be a Boolean, if not something weird is up...
                if (retVal instanceof Boolean) {
                    Boolean boolVal = (Boolean) retVal;
                    condTrue = boolVal.booleanValue();

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            expanderContext = StringUtil.HtmlEncodingMapWrapper.getHtmlEncodingMapWrapper(context, simpleEncoder);
        }


        try {
            // use the same Interpreter (ie with the same context setup) for all evals
            Interpreter bsh = this.getBshInterpreter(context);
            Iterator altTargetIter = this.altTargets.iterator();
            while (altTargetIter.hasNext()) {
                AltTarget altTarget = (AltTarget) altTargetIter.next();
                Object retVal = bsh.eval(altTarget.useWhen);
                boolean condTrue = false;
                // retVal should be a Boolean, if not something weird is up...
                if (retVal instanceof Boolean) {
                    Boolean boolVal = (Boolean) retVal;
                    condTrue = boolVal.booleanValue();

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