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.

   {
      URL url = Thread.currentThread().getContextClassLoader().getResource(scriptName);
      if (url == null)
         throw new IllegalArgumentException("Resource not found: " + scriptName);


      interpreter = new Interpreter ();
      //System.out.println(Thread.currentThread().getContextClassLoader());
      interpreter.setClassLoader(Thread.currentThread().getContextClassLoader());
      //interpreter.eval (new java.io.InputStreamReader (url.openStream()), new NameSpace (this.rootContextName), this.rootContextName);
      interpreter.eval (new java.io.InputStreamReader (url.openStream()));
      //interpreter.source (url.getFile(), new bsh.NameSpace(this.rootContextName));

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    public Object getComponentInstance(PicoContainer pico)
            throws PicoInitializationException, PicoIntrospectionException {


        if (instance == null) {
            try {
                Interpreter i = new Interpreter();
                i.set("adapter", this);
                i.set("picoContainer", pico);
                i.set("componentKey", getComponentKey());
                i.set("componentImplementation", getComponentImplementation());
                i.set("parameters", parameters != null ? Arrays.asList(parameters) : Collections.EMPTY_LIST);
                i.eval("import " + getComponentImplementation().getName() + ";");


                String scriptPath = "/" + getComponentImplementation().getName().replace('.', '/') + ".bsh";


                // Inside IDEA, this relies on the compilation output path being the same directory as the source path.
                // kludge - copy ScriptableDemoBean.bsh to the same location in the test output compile class path.
                // the same problem exists for maven, but some custom jelly script will be able to fix that.
                URL scriptURL = getComponentImplementation().getResource(scriptPath);
                if (scriptURL == null) {
                    throw new BeanShellScriptInitializationException("Couldn't load script at path " + scriptPath);
                }
                Reader sourceReader = new InputStreamReader(scriptURL.openStream());
                i.eval(sourceReader, i.getNameSpace(), scriptURL.toExternalForm());


                instance = i.get("instance");
                if (instance == null) {
                    throw new BeanShellScriptInitializationException("The 'instance' variable was not instantiated");
                }
            } catch (EvalError e) {
                throw new BeanShellScriptInitializationException(e);

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    public BeanShellContainerBuilder(URL script, ClassLoader classLoader) {
        super(script, classLoader);
    }
    
    protected PicoContainer createContainerFromScript(PicoContainer parentContainer, Object assemblyScope) {
        Interpreter i = new Interpreter();
        try {
            i.set("parent", parentContainer);
            i.set("assemblyScope", assemblyScope);
            i.eval(getScriptReader(), i.getNameSpace(), "nanocontainer.bsh");
            return (PicoContainer) i.get("pico");
        } catch (EvalError e) {
            throw new NanoContainerMarkupException(e);
        } catch (IOException e) {
            throw new NanoContainerMarkupException(e);
        }

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    * @param stream the stream
    * @throws Exception for any error
    */
   protected void loadScript (InputStream stream) throws Exception
   {
      Interpreter interpreter = new Interpreter ();
      interpreter.setClassLoader(Thread.currentThread().getContextClassLoader());
      interpreter.eval (new java.io.InputStreamReader (stream));


      scriptService = (ScriptService)interpreter.getInterface(ScriptService.class);


      // We now load the script preferences
      //
      String[] depends = null;
      try
      {
         depends = scriptService.dependsOn();
      }
      catch (Exception e)
      {
         log.trace("dependsOn", e);
      }
      if (depends != null)
      {
         dependsServices = new ObjectName[depends.length];
         for (int i=0; i<depends.length; i++)
            dependsServices[i] = new ObjectName (depends[i]);
      }


      String myName = null;
      try
      {
         myName = scriptService.objectName ();
      }
      catch (Exception e)
      {
         log.trace("objectName", e);
      }
      if (myName != null)
         this.preferedObjectName = new ObjectName (myName);


      Class[] intfs = null;
      try
      {
         intfs = scriptService.getInterfaces ();
         if (intfs != null)
            log.debug("getInterfaces=" + Arrays.asList(intfs));
      }
      catch (Exception e)
      {
         log.trace("getInterfaces", e);
      }
      if (intfs != null)
      {
         for (int i=0; i<intfs.length; i++)
         {
            Object iface = interpreter.getInterface(intfs[i]);
            supportedInterfaces.put (intfs[i], iface);
         }
      }


      this.mbeanInfo = generateMBeanInfo (intfs);

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  {
    super();
    
    this.bshScript = bshScript;


    interpreter = new Interpreter();
    
    interpreter.setClassLoader(Thread.currentThread().getContextClassLoader());


    try
    {

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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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    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;

View Full Code Here

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