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.

        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 ( String path : classPath )
                {
                    try
                    {
                        engine.getClassManager().addClassPath( new File( path ).toURI().toURL() );
                    }
                    catch ( IOException e )
                    {
                        throw new RuntimeException( "bad class path: " + path, e );
                    }
                }
            }


            if ( globalVariables != null )
            {
                for ( String variable : globalVariables.keySet() )
                {
                    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() );
            }

View Full Code Here

        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();

View Full Code Here

        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();

View Full Code Here

            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();

View Full Code Here

    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;

View Full Code Here

            jd.addParameter( p );
            parameterNameToExpressionID.put( parameter.getName(), new Integer(exp.getId()) );
        }


        String bshScript = JRBshGenerator.generateScript( jd );
        Interpreter interpreter = new Interpreter();
        interpreter.setClassLoader(interpreter.getClass().getClassLoader());
        interpreter.eval(new StringReader(bshScript));


        interpreter.eval("bshCalculator = createBshCalculator()");
        
        return interpreter;
    }

View Full Code Here




    synchronized void createInterpreter() {
        // create interpreter just-in-time
        if(interpreter == null) {
            interpreter=new Interpreter();
            try {
                interpreter.set("bsh_prot", this);
            }
            catch(EvalError evalError) {
            }

View Full Code Here

        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();

View Full Code Here

                throw new ContainerException("Invalid telnet-port defined in container configuration; not a valid int");
            }
        }


        // create the interpreter
        bsh = new Interpreter();


        // configure the interpreter
        if (bsh != null) {
            try {
                bsh.set(name, this);

View Full Code Here

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