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

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


        Expression expression = new Expression(args[0]);
        /* set the values */
        MBeanService service = ServiceFactory.getMBeanService();
        String[][] attributes = getAttributes(args);
        AttributeListData[] attrListData =
                service.setAttributes(
                        context.getServiceContext(expression.getAppName(),
                                expression.getMBeanName()),
                        attributes);
        Out.println();
        Out.println("Changed Attributes:");
        CommandUtils.printAttributeLists(attrListData);
        return true;

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    private String mbeanName = WILDCARD;
    /* this could be attribute or operation name */
    private String targetName = WILDCARD;


    public ACLContext(String aclContext){
        Expression expr = new Expression(aclContext);
        if(expr.getAppName() != null){
            appName = expr.getAppName();
        }
        if(expr.getMBeanName() != null){
            // todo: we need to convert the MBean name to canonical name
            //   for comparision. It will be good to further improve
            //    the comparision by allowing wild card comparisions.
            mbeanName = expr.getMBeanName();
        }
        if(expr.getTargetName() != null){
            targetName = expr.getTargetName();
        }
    }

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        }
        return false;
    }
    
    public String toString(){
        return new Expression(appName, mbeanName, targetName).toString();
    }

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        String[] args = context.getCommand().getArgs();
        if(args.length == 0){
            usage();
            return false;
        }
        Expression expression = new Expression(args[0]);
        if(expression.getAppName() == null ||
                expression.getMBeanName() == null ||
                expression.getTargetName() == null){
            usage();
            return false;
        }
        String[] params = new String[args.length - 1];
        for(int i=0; i<params.length; i++){
            params[i] = args[i+1];
        }
        /* execute the operation */
        MBeanService service = ServiceFactory.getMBeanService();
        ServiceContext serviceContext = context.getServiceContext(expression.getAppName(),
                        expression.getMBeanName());
        OperationResultData[] resultData =
                service.invoke(serviceContext,
                        expression.getTargetName(),
                        params);


        for(int i=0; i<resultData.length; i++){
            Out.println();
            Out.print(resultData[i].getApplicationName() + " > ");

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        if(args.length < 3){
            usage();
            return false;
        }


        Expression expression = new Expression(args[0]);
        /* set the values */
        MBeanService service = ServiceFactory.getMBeanService();
        String[][] attributes = getAttributes(args);
        if(logger.isLoggable(Level.FINE)){
            logger.log(Level.FINE, "Setting attr. name=" + attributes[0][0] +
                    " value=" + attributes[0][1]);
        }
        AttributeListData[] attrListData =
                service.setAttributes(
                        context.getServiceContext(expression.getAppName(),
                                expression.getMBeanName()),
                        attributes);
        Out.println();
        Out.println("Changed Attributes:");
        CommandUtils.printAttributeLists(attrListData);
        return true;

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        Map<String, ObjectAttribute> attrMap = new HashMap<String, ObjectAttribute>();
        Map<String, ObjectAttribute> wholeAttrMap = new HashMap<String, ObjectAttribute>();
        StringTokenizer st = new StringTokenizer(displayNames, "|");
        MBeanService mbeanService = ServiceFactory.getMBeanService();
        for (Object anExpression : exprList) {
            Expression expression = (Expression) anExpression;
            ServiceContext srvcContext = null;
            ObjectAttribute objAttribute = null;
            try {
                srvcContext = Utils.getServiceContext(context, expression);
                objAttribute = mbeanService.getObjectAttribute(srvcContext,
                        expression.getTargetName());
            } finally {
                if (srvcContext != null)
                    srvcContext.getServerConnection().close();
            }
            assert objAttribute != null;
            assert objAttribute.getStatus() == ObjectAttribute.STATUS_OK;
            if(attribRepWhole.equals(expression.toString()))
              wholeAttrMap.put(st.nextToken(), objAttribute);
            else
              attrMap.put(st.nextToken(), objAttribute);
        }

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           expression = expression.substring(1, expression.length()-1);
           if(expression.endsWith("|true")){
             expression = expression.substring(0, expression.indexOf("|true"));
             attribRepWhole = expression;
           }
           exprList.add(new Expression(expression));
       }
       return exprList;
   }

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        assert attributes != null;
        List exprList = parse(attributes);
        List<ObjectAttribute> objectAttrList = new LinkedList<ObjectAttribute>();
        MBeanService mbeanService = ServiceFactory.getMBeanService();
        for (Object anExpression : exprList) {
            Expression expression = (Expression) anExpression;
            ServiceContext srvcContext = null;
            ObjectAttribute objAttribute = null;
            try {
                srvcContext = Utils.getServiceContext(context, expression);
                objAttribute = mbeanService.getObjectAttribute(srvcContext,
                        expression.getTargetName());
            } finally {
                if (srvcContext != null)
                    srvcContext.getServerConnection().close();
            }
            assert objAttribute != null;

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            while(!expression.endsWith("]")){
                assert tokenizer.hasMoreTokens();
                expression += "," + tokenizer.nextToken();
            }
            expression = expression.substring(1, expression.length()-1);
            exprList.add(new Expression(expression));
        }
        return exprList;
    }

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