Examples of org.apache.commons.jexl2.Expression

org.apache.commons.jexl2.parser.JexlNode
Represents a single JEXL expression.
This simple interface provides access to the underlying expression through {@link Expression#getExpression()}.

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 884175 2009-11-25 16:23:41Z henrib $

        if (vars == null) {
            throw new IllegalArgumentException("vars");
        }
        
        engine = new JexlEngine();
        context = new MapContext(vars);
        variables = vars;
        
        log.trace("Using variables: {}", vars);
    }

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        for (Entry<Object,Object> entry : System.getProperties().entrySet()){
            sysVars.put((String)entry.getKey(), entry.getValue());
        }
        
        engine = new JexlEngine();
        context = new MapContext(sysVars);
        variables = sysVars;
        
        log.trace("Using variables: {}", sysVars);
    }

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


        JexlContext ctx = new MapContext(vars);


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


        return result;

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    /**
     * {@inheritDoc }
     */
    public Object evaluate(Object context, String expression) {
        Expression jexlExpression = engine.createExpression(expression);
        JexlContext jexlContext = new ObjectContext(engine, context);
        
        return jexlExpression.evaluate(jexlContext);
    }

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    }


    // JEXL-52: can be implemented by deriving Interpreter.{g,s}etAttribute; later
    public void test52base() throws Exception {
        JexlEngine jexl = new JexlEngine();
        Uberspect uber = jexl.getUberspect();
        // most likely, call will be in an Interpreter, getUberspect
        String[] names = ((Introspector) uber).getMethodNames(Another.class);
        assertTrue("should find methods", names.length > 0);
        int found = 0;
        for (String name : names) {

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            property = ((ASTIntegerLiteral) propertyNode).getLiteral();
            antVar = true;
        } else if (propertyNode instanceof ASTArrayAccess) {
            // first objectNode is the identifier
            objectNode = propertyNode;
            ASTArrayAccess narray = (ASTArrayAccess) objectNode;
            Object nobject = narray.jjtGetChild(0).jjtAccept(this, object);
            if (nobject == null) {
                throw new JexlException(objectNode, "array element is null");
            } else {
                object = nobject;
            }
            // can have multiple nodes - either an expression, integer literal or
            // reference
            last = narray.jjtGetNumChildren() - 1;
            for (int i = 1; i < last; i++) {
                objectNode = narray.jjtGetChild(i);
                if (objectNode instanceof JexlNode.Literal<?>) {
                    object = objectNode.jjtAccept(this, object);
                } else {
                    Object index = objectNode.jjtAccept(this, null);
                    object = getAttribute(object, index, objectNode);
                }
            }
            property = narray.jjtGetChild(last).jjtAccept(this, null);
        } else {
            throw new JexlException(objectNode, "illegal assignment form");
        }
        // deal with ant variable; set context
        if (antVar) {

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    /** {@inheritDoc} */
    public Object visit(ASTForeachStatement node, Object data) {
        Object result = null;
        /* first objectNode is the loop variable */
        ASTReference loopReference = (ASTReference) node.jjtGetChild(0);
        ASTIdentifier loopVariable = (ASTIdentifier) loopReference.jjtGetChild(0);
        /* second objectNode is the variable to iterate */
        Object iterableValue = node.jjtGetChild(1).jjtAccept(this, data);
        // make sure there is a value to iterate on and a statement to execute
        if (iterableValue != null && node.jjtGetNumChildren() >= 3) {
            /* third objectNode is the statement to execute */

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    /** {@inheritDoc} */
    public Object visit(ASTForeachStatement node, Object data) {
        Object result = null;
        /* first objectNode is the loop variable */
        ASTReference loopReference = (ASTReference) node.jjtGetChild(0);
        ASTIdentifier loopVariable = (ASTIdentifier) loopReference.jjtGetChild(0);
        /* second objectNode is the variable to iterate */
        Object iterableValue = node.jjtGetChild(1).jjtAccept(this, data);
        // make sure there is a value to iterate on and a statement to execute
        if (iterableValue != null && node.jjtGetNumChildren() >= 3) {
            /* third objectNode is the statement to execute */

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         */
        Object left = node.jjtGetChild(0).jjtAccept(this, data);
        for(int c = 2, size = node.jjtGetNumChildren(); c < size; c += 2) {
            Object right = node.jjtGetChild(c).jjtAccept(this, data);
            try {
                JexlNode op = node.jjtGetChild(c - 1);
                if (op instanceof ASTAdditiveOperator) {
                    String which = ((ASTAdditiveOperator) op).image;
                    if ("+".equals(which)) {
                        left = arithmetic.add(left, right);
                        continue;
                    }
                    if ("-".equals(which)) {
                        left = arithmetic.subtract(left, right);
                        continue;
                    }
                    throw new UnsupportedOperationException("unknown operator " + which);
                }
                throw new IllegalArgumentException("unknown operator " + op);
            } catch (RuntimeException xrt) {
                JexlNode xnode = findNullOperand(xrt, node, left, right);
                throw new JexlException(xnode, "+/- error", xrt);
            }
        }
        return left;
    }

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        Object object = node.jjtGetChild(0).jjtAccept(this, data);
        // can have multiple nodes - either an expression, integer literal or
        // reference
        int numChildren = node.jjtGetNumChildren();
        for (int i = 1; i < numChildren; i++) {
            JexlNode nindex = node.jjtGetChild(i);
            if (nindex instanceof JexlNode.Literal<?>) {
                object = nindex.jjtAccept(this, object);
            } else {
                Object index = nindex.jjtAccept(this, null);
                object = getAttribute(object, index, nindex);
            }
        }


        return object;

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