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.

    private Interpreter bshInterpreter;
  
  public BeanShellSampler()
  {
    try{
      bshInterpreter = new Interpreter();
    } catch (NoClassDefFoundError e){
      bshInterpreter=null;
    }
  }

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            Debug.logVerbose("Evaluating -- " + expression, module);
        if (Debug.verboseOn())
            Debug.logVerbose("Using Context -- " + context, module);


        try {
            Interpreter bsh = makeInterpreter(context);
            // evaluate the expression
            o = bsh.eval(expression);
            if (Debug.verboseOn())
                Debug.logVerbose("Evaluated to -- " + o, module);


            // read back the context info
            NameSpace ns = bsh.getNameSpace();
            String[] varNames = ns.getVariableNames();
            for (String varName: varNames) {
                context.put(varName, bsh.get(varName));
            }
        } catch (EvalError e) {
            Debug.logError(e, "BSH Evaluation error.", module);
            throw e;
        }

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        }
        return o;
    }


    public static Interpreter makeInterpreter(Map<String, ? extends Object> context) throws EvalError {
        Interpreter bsh = getMasterInterpreter(null);
        // Set the context for the condition
        if (context != null) {
            for (Map.Entry<String, ? extends Object> entry: context.entrySet()) {
                bsh.set(entry.getKey(), entry.getValue());
            }


            // include the context itself in for easier access in the scripts
            bsh.set("context", context);
        }


        return bsh;
    }

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            BshUtil.masterClassManagers.putIfAbsent(classLoader, master);
            master = BshUtil.masterClassManagers.get(classLoader);
        }


        if (master != null) {
            Interpreter interpreter = new Interpreter(new StringReader(""), System.out, System.err,
                    false, new NameSpace(master, "global"), null, null);
            return interpreter;
        } else {
            Interpreter interpreter = new Interpreter();
            interpreter.setClassLoader(classLoader);
            return interpreter;
        }
    }

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        }
    }


    public static Object runBshAtLocation(String location, Map<String, ? extends Object> context) throws GeneralException {
        try {
            Interpreter interpreter = makeInterpreter(context);


            Interpreter.ParsedScript script = null;
            script = parsedScripts.get(location);
            if (script == null) {
                synchronized (OfbizBshBsfEngine.class) {
                    script = parsedScripts.get(location);
                    if (script == null) {
                        URL scriptUrl = FlexibleLocation.resolveLocation(location);
                        if (scriptUrl == null) {
                            throw new GeneralException("Could not find bsh script at [" + location + "]");
                        }
                        Reader scriptReader = new InputStreamReader(scriptUrl.openStream());
                        script = interpreter.parseScript(location, scriptReader);
                        if (Debug.verboseOn()) Debug.logVerbose("Caching BSH script at: " + location, module);
                        parsedScripts.put(location, script);
                    }
                }
            }


            return interpreter.evalParsedScript(script);
        } catch (MalformedURLException e) {
            String errMsg = "Error loading BSH script at [" + location + "]: " + e.toString();
            Debug.logError(e, errMsg, module);
            throw new GeneralException(errMsg, e);
        } catch (ParseException e) {

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                    ScriptFrameworkErrorType.UNKNOWN );
            }
            // Set class loader to be used for class files
            // and jar files
            Thread.currentThread().setContextClassLoader(cl);
            Interpreter interpreter = new Interpreter();


            interpreter.getNameSpace().clear();
            // Set class loader to be used by interpreter
            // to look for classes by source e.g. interpreter
            // will use this classloader to search classpath
            // for source file ( bla.java ) on import or reference
            interpreter.setClassLoader(cl);
            try {
                interpreter.set("XSCRIPTCONTEXT",
                    ScriptContext.createContext(m_xModel, m_xInvocContext,
                        m_xContext, m_xMultiComponentFactory));


                interpreter.set("ARGUMENTS", aParams);
            }
            catch (bsh.EvalError e) {
                // Framework error setting up context
                throw new ScriptFrameworkErrorException( 
                    e.getMessage(), null,
                    metaData.getLanguageName(), metaData.getLanguage(),
                    ScriptFrameworkErrorType.UNKNOWN );
            }


            try {
                String source = null;
                Object result = null;


                ScriptEditorForBeanShell editor =
                    ScriptEditorForBeanShell.getEditor(
                       sourceUrl );


                if ( editor != null )
                {
                    result = editor.execute();


                    if (result == null)
                    {
                        return new Any(new Type(), null);
                    }
                    return result;
                }


                metaData.loadSource();  
                source = metaData.getSource();


                if ( source == null || source.length() == 0 )
                {
                  throw new ScriptFrameworkErrorException( 
                        "Failed to read script", null,
                      metaData.getLanguageName(), metaData.getLanguage(),
                      ScriptFrameworkErrorType.UNKNOWN );
                }
                result = interpreter.eval( source );


                if (result == null)
                {
                    return new Any(new Type(), null);
                }

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        PrintStream origOut = System.out;
        PrintStream origErr = System.err;


        try
        {
            Interpreter engine = new Interpreter();


            if ( scriptOutput != null )
            {
                System.setErr( scriptOutput );
                System.setOut( scriptOutput );
                engine.setErr( scriptOutput );
                engine.setOut( scriptOutput );
            }


            if ( !Capabilities.haveAccessibility() )
            {
                try
                {
                    Capabilities.setAccessibility( true );
                }
                catch ( Exception e )
                {
                    if ( scriptOutput != null )
                    {
                        e.printStackTrace( scriptOutput );
                    }
                }
            }


            if ( classPath != null && !classPath.isEmpty() )
            {
                for ( Iterator it = classPath.iterator(); it.hasNext(); )
                {
                    String path = (String) it.next();
                    try
                    {
                        engine.getClassManager().addClassPath( new File( path ).toURI().toURL() );
                    }
                    catch ( IOException e )
                    {
                        throw new RuntimeException( "bad class path: " + path, e );
                    }
                }
            }


            if ( globalVariables != null )
            {
                for ( Iterator it = globalVariables.keySet().iterator(); it.hasNext(); )
                {
                    String variable = (String) it.next();
                    Object value = globalVariables.get( variable );
                    try
                    {
                        engine.set( variable, value );
                    }
                    catch ( EvalError e )
                    {
                        throw new RuntimeException( e );
                    }
                }
            }


            try
            {
                return engine.eval( script );
            }
            catch ( TargetError e )
            {
                throw new ScriptEvaluationException( e.getTarget() );
            }

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   */
  protected Interpreter createInterpreter()
  {
    try
    {
      final Interpreter interpreter = new Interpreter();
      initializeInterpreter(interpreter);
      return interpreter;
    }
    catch (Throwable e)
    {

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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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  private THashMap name2var = new THashMap ();


  public static Assignment readFromMatrix (VarSet vars, Reader in) throws IOException
  {
    Variable[] varr = vars.toVariableArray ();
    Interpreter interpreter = new Interpreter ();
    BufferedReader bIn = new BufferedReader (in);
    Assignment assn = new Assignment ();
    String line;


    while ((line = bIn.readLine ()) != null) {
      String[] fields = line.split ("\\s+");
      Object[] vals = new Object [fields.length];
      for (int i = 0; i < fields.length; i++) {
        try {
          vals[i] = interpreter.eval (fields[i]);
        } catch (EvalError e) {
          throw new RuntimeException ("Error reading line: "+line, e);
        }
      }
      assn.addRow (varr, vals);

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