Examples of org.apache.commons.jexl.Expression

org.apache.commons.jexl.Expression

Represents a single JEXL expression. This simple interface provides access to the underlying expression through getExpression(), and it provides hooks to add a pre- and post- expression resolver.

An expression is different than a script - it is simply a reference of an expression.
@since 1.0 @author Geir Magnusson Jr. @version $Id: Expression.java 397092 2006-04-26 05:11:28Z dion $

    {
      try
      {
        CallflowNotification notif = (CallflowNotification) notification;
        JexlContext jc = JexlHelper.createContext();
        Expression msgExpression = null;
        msgExpression = ExpressionFactory.createExpression("log." + _filter);


        jc.getVars().put("log", notif.getMessageInfo());
        jc.getVars().put("message", notif.getMessageInfo().getMessage());


        return ((Boolean) msgExpression.evaluate(jc));
      }
      catch (Exception e)
      {
        Log.ignore(e);
      }

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      return null;
    
    synchronized (this)
    {
      JexlContext jc = JexlHelper.createContext();
      Expression msgExpression = null;
      if (msgFilter != null && !msgFilter.trim().equals(""))
      {
        Log.debug("Get messages with filter: " + msgFilter);
        msgExpression = ExpressionFactory.createExpression("log." + msgFilter);
      }
    
      List<MessageInfo> result = new ArrayList<MessageInfo>();
      ListIterator<MessageInfo> it = iterate(false);
      
      int i = 0;
      while (it.hasPrevious() && i < maxMessages)
      {
        MessageInfo info = it.previous();
        jc.getVars().put("log", info);
        jc.getVars().put("message", info.getMessage());
      
        if (msgExpression == null || ((Boolean) msgExpression.evaluate(jc)).booleanValue())
        {
          result.add(0, info);
          i++;
        }
      }

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      return null;
    
    synchronized (this)
    {
      JexlContext jc = JexlHelper.createContext();
      Expression msgExpression = null;
      if (msgFilter != null && !msgFilter.trim().equals(""))
      {
        Log.debug("Get messages with filter: " + msgFilter);
        msgExpression = ExpressionFactory.createExpression("log." + msgFilter);
      }
    
      List<MessageInfo> result = new ArrayList<MessageInfo>();
      ListIterator<MessageInfo> it = iterate(false);
      
      int i = 0;
      while (it.hasPrevious() && i < maxMessages)
      {
        MessageInfo info = it.previous();
        jc.getVars().put("log", info);
        jc.getVars().put("message", info.getMessage());
      
        if (msgExpression == null || ((Boolean) msgExpression.evaluate(jc)).booleanValue())
        {
          result.add(0, info);
          i++;
        }
      }

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        ReflectionUtils.doWithMethods(obj.getClass(), new ReflectionUtils.MethodCallback() {
            @SuppressWarnings("unchecked")
            public void doWith(Method method) throws IllegalArgumentException, IllegalAccessException {
                if (method.getAnnotation(Callback.class) != null) {
                    try {
                        Expression e = ExpressionFactory.createExpression(
                                method.getAnnotation(Callback.class).condition());
                        JexlContext jc = JexlHelper.createContext();
                        jc.getVars().put("this", obj);
                        Object r = e.evaluate(jc);
                        if (!(r instanceof Boolean)) {
                            throw new RuntimeException("Expression did not returned a boolean value but: " + r);
                        }
                        Boolean oldVal = req.getCallbacks().get(method);
                        Boolean newVal = (Boolean) r;

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    private Object doEvaluate(final String expression) throws Exception {
        assert expression != null;


        log.debug("Evaluating expression: {}", expression);
        
        Expression expr = ExpressionFactory.createExpression(expression);


        JexlContext ctx = JexlHelper.createContext();
        ctx.setVars(vars);


        Object result = expr.evaluate(ctx);
        log.debug("Result: {}", result);


        return result;
    }

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    private FlatResolver resolver = new FlatResolver(true);


    protected Expression createExpression(final String expression) throws Exception {
        // assert expression != null;


        Expression expr = ExpressionFactory.createExpression(expression);
        expr.addPreResolver(resolver);


        return expr;
    }

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            throw new IllegalArgumentException("expression");
        }


        log.trace("Evaluating expression: {}", expression);


        Expression expr = createExpression(expression);
        Object obj = expr.evaluate(context);
        log.trace("Result: {}", obj);


        return obj;
    }

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        if (vars == null) {
            return null;
        }
        
        Expression e = ExpressionFactory.createExpression(expression);


        JexlContext jc = JexlHelper.createContext();
        jc.setVars(vars);


        return e.evaluate(jc);
    }

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    @SuppressWarnings(value = "unchecked")
    public Object eval(String expression, Map<String, Object> contextData) {
        Object result = null;
        try {
            // Create expression
            Expression exp = ExpressionFactory.createExpression(expression);


            // Create a context and add data
            JexlContext jc = JexlHelper.createContext();
            if (null != contextData && contextData.size() > 0) {
                for (Map.Entry<String, Object> entry : contextData.entrySet()) {
                    jc.getVars().put(entry.getKey(), entry.getValue());
                }
            }


            // Now evaluate the expression, getting the result
            result = exp.evaluate(jc);
        } catch (Exception ex) {
        }
        return result;
    }

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        JMeterContext jmctx = JMeterContextService.getContext();
        JMeterVariables vars = jmctx.getVariables();


        try
        {
            Expression e = ExpressionFactory.createExpression(exp);
            JexlContext jc = JexlHelper.createContext();
            final Map jexlVars = jc.getVars();
            jexlVars.put("ctx", jmctx); //$NON-NLS-1$                
            jexlVars.put("vars", vars); //$NON-NLS-1$
            jexlVars.put("props", JMeterUtils.getJMeterProperties()); //$NON-NLS-1$
            jexlVars.put("theadName", Thread.currentThread().getName()); //$NON-NLS-1$
            jexlVars.put("sampler", currentSampler); //$NON-NLS-1$ (may be null)
            jexlVars.put("sampleResult", previousResult); //$NON-NLS-1$ (may be null)


            // Now evaluate the expression, getting the result
            Object o = e.evaluate(jc);
            if (o != null)
            {
                str = o.toString();
            }
            if (vars != null && varName.length() > 0) {// vars will be null on TestPlan

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