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arraysjexl
Pratik
Pratik

Reputation: 978

How to use Array in JEXL?

Using JEXL, I am trying to initialize array and than adding elements into it, however below code gives me 'unsolvable property '0' error.

var abc=[]; 
abc[0]=5;

1) How can I initialize empty array and keep adding values in it?

2) Can I use it like List, where I do not need to specify size at the time of initialization ?

Upvotes: 0

Views: 4212

Answers (2)

David Costanzo
David Costanzo

Reputation: 266

In JEXL, the syntax [] creates a Java array, not a List. As an array, it has a fixed size, so you cannot add values to it. However, JEXL 3.2 has a new syntax for creating an ArrayList literal. Basically, you add ... as the final element.

So in JEXL 3.2, your example could be written as:

var abc=[...]; 
abc.add(5);

See the JEXL literal syntax reference for more information.

Upvotes: 0

Ori Marko
Ori Marko

Reputation: 58774

in JEXL syntax you can initialize objects with new function.

Other option is to add to context arraylist:

This is a working example with jexl2:

    JexlEngine jexl = new JexlEngine();
    String jexlExp = "var abc=new(\"java.util.ArrayList\", 1);abc[0]=5";
    Expression e = jexl.createExpression( jexlExp );
    List<Integer> abc = new ArrayList<>(1);
    JexlContext jc = new MapContext();
    //jc.set("abc", abc ); second option to add arraylist to context
    Object o = e.evaluate(jc);

Upvotes: 0

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