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.


        code=new String(buf);


        // create interpreter just-in-time
        if(interpreter == null) {
            interpreter=new Interpreter();


                if(log.isInfoEnabled()) log.info("beanshell interpreter was created");
            try {
                interpreter.set("bsh_prot", this);

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  public Map<String, Object> eval(Map<String, Object> inputMap, Set<String> outputNames) {
    Map<String, Object> outputMap = new HashMap<String, Object>();


    try {
      log.debug("script input: " + inputMap);
      Interpreter interpreter = new Interpreter();
      for (Map.Entry<String, Object> entry : inputMap.entrySet()) {
        String inputName = entry.getKey();
        Object inputValue = entry.getValue();
        interpreter.set(inputName, inputValue);
      }
      interpreter.eval(expression);
      for (String outputName : outputNames) {
        Object outputValue = interpreter.get(outputName);
        outputMap.put(outputName, outputValue);
      }
      log.debug("script output: " + outputMap);
    }
    catch (ParseException e) {

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        public EvaluationResult evaluate(EvaluationContext context, Message message)
                throws EvaluationException
        {
            try
            {
                Interpreter _interpreter = new Interpreter();


                // TODO import useful stuff
                // predefine useful functions?
                _interpreter.eval("import org.omg.CORBA.*;");


                _interpreter.set("event", message.toAny());
                _interpreter.set("date", new Date());
                _interpreter.set("constraint", constraint_);
                Object _result = _interpreter.eval(constraint_);


                if (_result == null)
                {
                    return EvaluationResult.BOOL_FALSE;
                }

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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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            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);
            for (AltTarget altTarget: this.altTargets) {
                Object retVal = bsh.eval(StringUtil.convertOperatorSubstitutions(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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    public void resetBshInterpreter(Map<String, Object> context) {
        context.remove("bshInterpreter");
    }


    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;

View Full Code Here

     */
    public String getStyleAltRowStyle(Map<String, Object> context) {
        String styles = "";
        try {
            // use the same Interpreter (ie with the same context setup) for all evals
            Interpreter bsh = this.getBshInterpreter(context);
            for (AltRowStyle altRowStyle : this.altRowStyles) {
                Object retVal = bsh.eval(StringUtil.convertOperatorSubstitutions(altRowStyle.useWhen));
                // retVal should be a Boolean, if not something weird is up...
                if (retVal instanceof Boolean) {
                    Boolean boolVal = (Boolean) retVal;
                    if (boolVal.booleanValue()) {
                        styles += altRowStyle.style;

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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(StringUtil.convertOperatorSubstitutions(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(StringUtil.convertOperatorSubstitutions(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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            });
            editor.requestFocus();


//            BSHOutputAdapter out = new BSHOutputAdapter(output);
            ConsoleInterface bshConsole = new BSHConsole(output);
            interpreter = new Interpreter(bshConsole);
            interpreter.setClassLoader(Thread.currentThread().getContextClassLoader());


            CharvaBshCommandInvoker shell = new CharvaBshCommandInvoker();
            try {
                interpreter.set("interpreter", interpreter);

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