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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)
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Special treatment of objects of specific Java classes
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.
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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']) |
Java List element access/update via array index access/update syntax
Elements of java.util.List objects can be access as though those are array elements - array like indexed element access and update is supported.
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// Java List elements accessed/modified via
// array element access/update syntax
var ArrayList = Java.type("java.util.ArrayList")
var list = new ArrayList()
// add elements to list by List's add method calls
list.add("js")
list.add("ecmascript")
list.add("nashorn")
// get by List's get(int) method
print(list[0])
print(list[1])
print(list[2])
// access list elements by indexed access as well
print(list[0])
print(list[1])
print(list[2])
// assign to list elements by index as well
list[0] = list[0].toUpperCase()
list[1] = list[1].toUpperCase()
list[2] = list[2].toUpperCase()
print(list.get(0))
print(list.get(1))
print(list.get(2))
print(list[0])
print(list[1])
print(list[2]) |
Lambdas, SAM types and Script functions
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