Thank you for the workaround!
For a slightly more complex case of overriding putAt I found that I can do like
this if I also provide a getAt which might be of interest for others trying to
do similar things:
class TwoD {
List<List<?>> rows = []
TwoD(List rows) {
this.rows = rows
}
def putAt(List list, Object value) {
println "putAt: $list : $value"
Integer rowIdx = list[0] as Integer
Integer colIdx = list[1] as Integer
// Must add parenthesis for assignment to work
(rows[rowIdx][colIdx]) = value
}
// This is never called in putAt but when compiling static, it must exists
for it to compile, otherwise we get the following compilation error:
// [Static type checking] - Cannot find matching method
PutAtTest$TwoD#getAt(java.util.List<E>). Please check if the declared type is
correct and if the method exists.
def getAt(List where) {
println "getAt: $where"
Integer rowIdx = where[0] as Integer
Integer colIdx = where[1] as Integer
return rows[rowIdx][colIdx]
}
String toString() {
StringBuilder sb = new StringBuilder()
rows.each { List row ->
row.each {sb.append(it).append(', ')}
sb.append('\n')
}
sb
}
}
@CompileStatic
@Test
void testOverride() {
def d = new TwoD([[1,2,3], ['a', 'b', 'c']])
println d
d[0,1] = null
println d
assert d[0,1] == null
assert d[1,2] == 'c'
}
Which will output
1, 2, 3,
a, b, c,
putAt: [0, 1] : null
1, null, 3,
a, b, c,
getAt: [0, 1]
getAt: [1, 2]
Regards,
Per
On 2025-04-14, 10:57, "Paul King" <pa...@asert.com.au
<mailto:pa...@asert.com.au>> wrote:
A workaround is to cast, e.g.
list[1] = (String) null
I don't see why that is needed for null. On GROOVY_4_0_X, the map also
needs the cast. On master, only the list needs the cast. I can't
explain that either (yet).
Paul.
On Mon, Apr 14, 2025 at 5:37 PM Per Nyfelt <per.nyf...@nordnet.se
<mailto:per.nyf...@nordnet.se>> wrote:
>
> Hi,
>
> I was recently experimenting with @CompileStatic for performance improvements
> and noticed that when using the short notation of putAt to assign a null
> value I get the following error
>
> [Static type checking] - Cannot call <T>
> org.codehaus.groovy.runtime.DefaultGroovyMethods#putAt(java.util.List<T>,
> int, T) with arguments [java.util.List<java.lang.String>, int,
> java.lang.Object]
>
>
>
> Here is an example:
>
>
>
> import groovy.transform.CompileStatic
> import org.junit.jupiter.api.Test
>
> @CompileStatic
> class PutAtTest {
>
> @Test
> void testList() {
> // These all work
> def list = ['a', 'b', 'c']
> list[0] = 'aa'
> assert list[0] == 'aa'
>
> list.set(2, null)
> assert list[2] == null
>
> list.putAt(0, null)
> assert list[0] == null
>
> // This Fails
> list[1] = null
> assert list[1] == null : "Short notation not working when assigning null"
> }
>
> @Test
> void testMap() {
> // These all work
> def map = [a: 'foo', b: 'bar', c: 'baz']
> map['a'] = 'aa'
> assert map['a'] == 'aa'
>
> map.put('c', null)
> assert map['c'] == null
>
> map.putAt('a', null)
> assert map['a'] == null
>
> // This Fails
> map['b'] = null
> assert map['b'] == null : "Short notation not working when assigning null"
> }
> }
>
>
>
> Is this expected behavior or a bug? Does anyone know of workaround?
>
>
>
> Regards,
>
> Per
