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.

            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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                    java.net.URL url = new java.net.URL(classname);
                    classname = url.getFile();
                    File file = new File(classname);
                    classname = file.getName();
                    classname = classname.substring(0, classname.length() - 4);
                    Interpreter i = new Interpreter(); // Construct an interpreter
                    BshClassManager bsh = i.getClassManager();
                    if (!bsh.classExists(classname)) {
                        i.source(url.getFile());
                    }
                    ti = bsh.classForName(classname);
                } catch (IOException ex) {
                    System.err.println("File missing:" + ex);
                    return null;

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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.NO_SUCH_SCRIPT );
                }
                result = interpreter.eval( source );


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

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    private Interpreter i;
    
    /** Creates a new instance of ScriptEngineBeanshell */
    public ScriptEngineBeanshell() {
        i = new Interpreter();
    }

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   * @return the scripted Java class, or <code>null</code> if none could be determined
   * @throws EvalError in case of BeanShell parsing failure
   */
  static Class determineBshObjectType(String scriptSource) throws EvalError {
    Assert.hasText(scriptSource, "Script source must not be empty");
    Interpreter interpreter = new Interpreter();
    Object result = interpreter.eval(scriptSource);
    if (result instanceof Class) {
      return (Class) result;
    }
    else if (result != null) {
      return result.getClass();

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   */
  static Object evaluateBshScript(String scriptSource, Class[] scriptInterfaces, ClassLoader classLoader)
      throws EvalError {


    Assert.hasText(scriptSource, "Script source must not be empty");
    Interpreter interpreter = new Interpreter();
    Object result = interpreter.eval(scriptSource);
    if (result != null) {
      return result;
    }
    else {
      // Simple BeanShell script: Let's create a proxy for it, implementing the given interfaces.
      Assert.notEmpty(scriptInterfaces,
          "Given script requires a script proxy: At least one script interface is required.");
      XThis xt = (XThis) interpreter.eval("return this");
      return Proxy.newProxyInstance(classLoader, scriptInterfaces, new BshObjectInvocationHandler(xt));
    }
  }

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   * @return the scripted Java class, or <code>null</code> if none could be determined
   * @throws EvalError in case of BeanShell parsing failure
   */
  static Class determineBshObjectType(String scriptSource) throws EvalError {
    Assert.hasText(scriptSource, "Script source must not be empty");
    Interpreter interpreter = new Interpreter();
    Object result = interpreter.eval(scriptSource);
    if (result instanceof Class) {
      return (Class) result;
    }
    else if (result != null) {
      return result.getClass();

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   */
  static Object evaluateBshScript(String scriptSource, Class[] scriptInterfaces, ClassLoader classLoader)
      throws EvalError {


    Assert.hasText(scriptSource, "Script source must not be empty");
    Interpreter interpreter = new Interpreter();
    Object result = interpreter.eval(scriptSource);
    if (result != null) {
      return result;
    }
    else {
      // Simple BeanShell script: Let's create a proxy for it, implementing the given interfaces.
      Assert.notEmpty(scriptInterfaces,
          "Given script requires a script proxy: At least one script interface is required.");
      XThis xt = (XThis) interpreter.eval("return this");
      return Proxy.newProxyInstance(classLoader, scriptInterfaces, new BshObjectInvocationHandler(xt));
    }
  }

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     return beanShellPanel;
  }
  
  public Interpreter getInterpreter() {
    if (interpreter == null) {
      interpreter = new Interpreter(getBeanShellPanel().getConsole());
    }
    return interpreter;
  }

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        m_jConsole = new JConsole();


        this.setLayout( new BorderLayout() );
        this.add( m_jConsole, BorderLayout.CENTER );


        m_interpreter = new Interpreter( m_jConsole );
        try
        {
            m_interpreter.set( "phoenix-kernel", kernel );
        }
        catch( EvalError ee )

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