el function with generic arraylist return type and with parameter

Question

I want to return ArrayList<HashMap<String,String>> in EL function with three String argument. How to do that?

Answer 1

You can use complex return types in your tld, too. E.g. this will work:

public static List<Map<String, String>> func(String arg1, String arg2,
        String arg3) {

    List<Map<String, String>> out = new ArrayList<HashMap<String, String>>();
    // code code code
    return out;
}

In your .tld file, you'll have to put this:

<function>
  <description>Blah blah blah</description>
  <name>func</name>
  <function-class>your.package.YourClassName</function-class>
  <function-signature>
    java.util.List&lt;java.util.Map&lt;java.lang.String,java.lang.String&gt;&gt; func(java.lang.String,java.lang.String,java.lang.String)
  </function-signature>
</function>

Caveats: As in this example, the angle brackets must be properly escaped in XML. The function signature must not be line wrapped. Non-unary generics, such as Map<String,String>, cannot be used as parameters. (Probably a tokenization bug.) You will have to go with the raw types there.