Examples of org.jmanage.core.util.Expression

org.jmanage.core.util.Expression
Provides a mechanism to specify application name, mbean name and attribute or operation name as a single String expression. The expression looks like the following:
<appName>/<mbeaName>/<attrName>
The mbeanName could be the "configured" mbean name or the object name. This depends on the context in which Expression object is used.
This object is widely used in the jManage application specifically in the command line UI and the access control system. Date: Feb 26, 2005 @author Rakesh Kalra


            // todo: it will be good to bring in a concept of ExpressionList
            // todo:    object which parses an expression into multiple
            // todo:    Expression objects - RK
            graphAttributes.append("[");
            Expression expr = new Expression(appConfig.getName(),
                    attrConfig.getMBean(),
                    attrConfig.getAttribute());
            graphAttributes.append(expr.toString());
            graphAttributes.append("]");
        }
        return graphAttributes.toString();
    }

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        String[] attributes = form.getAttributes();
        String[] displayNames = request.getParameterValues("displayNames");
        List<GraphAttributeConfig> graphAttrConfigs = 
          new ArrayList<GraphAttributeConfig>(attributes.length);
        for(int i=0; i<attributes.length; i++){
            Expression expression = new Expression(attributes[i]);
            GraphAttributeConfig graphAttrConfig = new GraphAttributeConfig(
                    expression.getMBeanName(),expression.getTargetName(),
                    displayNames[i]);
            graphAttrConfigs.add(graphAttrConfig);
        }
        String graphId = request.getParameter(RequestParams.GRAPH_ID);
        GraphConfig graphConfig = null;

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        AlertForm alertForm = (AlertForm)actionForm;
        String sourceType = request.getParameter(RequestParams.ALERT_SOURCE_TYPE);
        request.setAttribute("alertSourceType",
                            sourceType);
        if(sourceType.equals(AlertSourceConfig.SOURCE_TYPE_NOTIFICATION)){
            Expression expr = new Expression(alertForm.getExpression());
            request.setAttribute("sourceMBean", expr.getMBeanName());
            request.setAttribute("notificationType", expr.getTargetName());
        }else if(sourceType.equals(AlertSourceConfig.SOURCE_TYPE_GAUGE_MONITOR)
                || sourceType.equals(AlertSourceConfig.SOURCE_TYPE_STRING_MONITOR)){
            Expression expr = new Expression(alertForm.getExpression());
            request.setAttribute("sourceMBean", expr.getMBeanName());
            request.setAttribute("attribute", expr.getTargetName());
            MBeanService mbeanService = ServiceFactory.getMBeanService();
            ObjectAttribute objAttr = mbeanService.getObjectAttribute(
                    Utils.getServiceContext(context, expr),
                    expr.getTargetName());
            request.setAttribute("currentAttrValue",
                    objAttr.getDisplayValue());


        }

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    }


    private AlertSourceConfig getAlertSourceConfig(WebContext context,
                                                   AlertForm form){
        AlertSourceConfig sourceConfig = null;
        Expression expression = new Expression(form.getExpression());
        if(AlertSourceConfig.SOURCE_TYPE_NOTIFICATION.equals(
                form.getAlertSourceType())){
            sourceConfig = new AlertSourceConfig(expression.getMBeanName(),
                    expression.getTargetName());
        }else if(AlertSourceConfig.SOURCE_TYPE_GAUGE_MONITOR.equals(
                form.getAlertSourceType())){
            MBeanService mbeanService = ServiceFactory.getMBeanService();
            String attributeDataType = mbeanService.getAttributeDataType(
                    Utils.getServiceContext(context),expression.getTargetName(),
                    expression.getMBeanName());
            sourceConfig = new AlertSourceConfig(expression.getMBeanName(),
                    expression.getTargetName(),
                    CoreUtils.valueOf(form.getMinAttributeValue(),attributeDataType),
                    CoreUtils.valueOf(form.getMaxAttributeValue(),attributeDataType),
                    attributeDataType);
        }else if(AlertSourceConfig.SOURCE_TYPE_STRING_MONITOR.equals(
                form.getAlertSourceType())){
            sourceConfig = new AlertSourceConfig(expression.getMBeanName(),
                    expression.getTargetName(), form.getStringAttributeValue());


        }else if(AlertSourceConfig.SOURCE_TYPE_APPLICATION_DOWN.equals(
                form.getAlertSourceType())){
            sourceConfig = new AlertSourceConfig();

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        String[] attributes = form.getAttributes();
        String[] attributeNames = new String[attributes.length];
        String[] objectNames = new String[attributes.length];
        String[] displayNames = new String[attributes.length];
        for(int i=0; i<attributes.length;i++){
            Expression expression = new Expression(attributes[i]);
            attributeNames[i] = expression.getTargetName();
            displayNames[i] = expression.getTargetName();
            objectNames[i] = expression.getMBeanName();
        }
        request.setAttribute("attributeNames", attributeNames);
        request.setAttribute("objectNames",objectNames);
        request.setAttribute("displayNames",displayNames);
        /*set current page for navigation*/

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        if(args.length != 1){
            usage();
            return false;
        }


        Expression expression = new Expression(args[0]);
        if(expression.getAppName() == null || expression.getMBeanName() == null){
            usage();
            return false;
        }


        MBeanService service = ServiceFactory.getMBeanService();
        ObjectInfo objectInfo =
                service.getMBeanInfo(context.getServiceContext(
                        expression.getAppName(), expression.getMBeanName()));
        printObjectInfo(objectInfo);
        return true;
    }

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     */
    private String getAttributesForGraph(String applicationName) throws Exception{
        StringBuffer graphAttributes = new StringBuffer();
        for(String mbean : mbeans){
            for(String attribute : attributes.get(mbean)){
                Expression expr =
                        new Expression(applicationName, mbean, attribute);
                if(graphAttributes.length() > 0){
                    graphAttributes.append(",");
                }
                graphAttributes.append("[");
                graphAttributes.append(expr.toString());
                graphAttributes.append("]");
            }
        }
        return URLEncoder.encode(graphAttributes.toString(), "UTF-8");
    }

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        if(args.length == 0){
            usage();
            return false;
        }


        Expression expression = new Expression(args[0]);
        /* get the values */
        MBeanService service = ServiceFactory.getMBeanService();


        String[] attributeNames = null;
        if(args.length > 1){
            attributeNames = new String[args.length - 1];
            for(int i=0; i< attributeNames.length; i++){
                attributeNames[i] = args[i+1];
            }
        }
        ServiceContext serviceContext =
                context.getServiceContext(expression.getAppName(),
                            expression.getMBeanName());
        AttributeListData[] attributeValues = null;
        if(attributeNames != null){
            attributeValues = service.getAttributes(serviceContext,
                    attributeNames, true);
        }else{

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            String sourceType = alertSrcConfig.getSourceType();
            form.setAlertSourceType(alertSrcConfig.getSourceType());
            request.setAttribute("alertSourceType",sourceType);
            request.setAttribute("sourceMBean", alertSrcConfig.getObjectName());
            // expression
            Expression expression = null;
            if(sourceType.equals(AlertSourceConfig.SOURCE_TYPE_NOTIFICATION) || 
              sourceType.equals(AlertSourceConfig.SOURCE_TYPE_APPLICATION_DOWN)){
                expression = new Expression(null, alertSrcConfig.getObjectName(),
                        alertSrcConfig.getNotificationType());
                request.setAttribute("notificationType",
                        alertSrcConfig.getNotificationType());
            }else if(sourceType.equals(
                    AlertSourceConfig.SOURCE_TYPE_GAUGE_MONITOR) ||sourceType.equals(
                    AlertSourceConfig.SOURCE_TYPE_STRING_MONITOR) ){
                expression = new Expression(null, alertSrcConfig.getObjectName(),
                        alertSrcConfig.getAttributeName());
                request.setAttribute("attribute", alertSrcConfig.getAttributeName());
                MBeanService mbeanService = ServiceFactory.getMBeanService();
                ObjectAttribute objAttr = mbeanService.getObjectAttribute(
                    Utils.getServiceContext(context, expression),
                    expression.getTargetName());
                request.setAttribute("currentAttrValue",
                        objAttr.getDisplayValue());
                if(sourceType.equals(
                    AlertSourceConfig.SOURCE_TYPE_GAUGE_MONITOR)){
                    form.setMinAttributeValue(alertSrcConfig.getLowThreshold().toString());
                    form.setMaxAttributeValue(alertSrcConfig.getHighThreshold().toString());
                }else if(sourceType.equals(
                    AlertSourceConfig.SOURCE_TYPE_STRING_MONITOR)){
                    form.setStringAttributeValue(alertSrcConfig.getStringAttributeValue());
                }
            }
            form.setExpression(expression.toString());
        }
        /*set current page for navigation*/
        request.setAttribute(RequestAttributes.NAV_CURRENT_PAGE, "Edit Alert");
        return mapping.findForward(Forwards.SUCCESS);
    }

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        /* parse the expression and get the hashmap of appname+mbeanname to
            attribute list */
        final Map<AppMBeanKey, List<String>> appMBeanToAttributesMap = 
          new HashMap<AppMBeanKey, List<String>>();


        Expression expression = null;
        for(int i=0; i<args.length; i++){
            expression = new Expression(args[i], expression);
            if(expression.getAppName() == null ||
                    expression.getMBeanName() == null ||
                    expression.getTargetName() == null){
                usage();
                return false;
            }
            AppMBeanKey key = new AppMBeanKey(expression.getAppName(),
                    expression.getMBeanName());
            List<String> attributes = appMBeanToAttributesMap.get(key);
            if(attributes == null){
                attributes = new LinkedList<String>();
                appMBeanToAttributesMap.put(key, attributes);
            }
            attributes.add(expression.getTargetName());
        }


        /* now get the values */
        MBeanService service = ServiceFactory.getMBeanService();
        for(Iterator it=appMBeanToAttributesMap.keySet().iterator(); it.hasNext();){

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