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changes.mady.by.user Sundararajan Athijegannathan

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changes.mady.by.user Sundararajan Athijegannathan

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Code Block
titleJava.super example
var CharArray = Java.type("char[]")
var jString = Java.type("java.lang.String")
var Character = Java.type("java.lang.Character")

function capitalize(s) {
    if(s instanceof CharArray) {
        return new jString(s).toUpperCase()
    }
    if(s instanceof jString) {
        return s.toUpperCase()
    }
    return Character.toUpperCase(s) // must be int
}

var sw = new (Java.type("java.io.StringWriter"))

var FilterWriterAdapter = Java.extend(Java.type("java.io.FilterWriter"))

var cw = new FilterWriterAdapter(sw) {
    write: function(s, off, len) {
        s = capitalize(s)
        // Must handle overloads by arity
        if(off === undefined) {
            cw_super.write(s, 0, s.length())
        } else if (typeof s === "string") {
            cw_super.write(s, off, len)
        }
    }
}
var cw_super = Java.super(cw)

cw.write("abcd")
cw.write("e".charAt(0))
cw.write("fgh".toCharArray())
cw.write("**ijk**", 2, 3)
cw.write("***lmno**".toCharArray(), 3, 4)
cw.flush()
print(sw)

Java Map keys as properties

Nashorn allows java.util.Map instances to be treated like a script object - in that it allows indexed, property access to Map's keys.

Code Block
titlejava.util.Map keys as properties example
var HashMap = Java.type("java.util.HashMap")
var map = new HashMap()
// map key-value access by java get/put method calls
map.put('js', 'nashorn')
print(map.get('js'))
// access keys of map as properties
print(map['js'])
print(map.js)
// also assign new key-value pair 
// as 'property-value'
map['language'] = 'java'
print(map.get("language"))
print(map.language)
print(map['language'])
map.answer = 42
print(map.get("answer"))
print(map.answer)
print(map['answer'])

Lambdas, SAM types and Script functions

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