Groovy example source code file (Groovy3509Bug.groovy)

This example Groovy source code file (Groovy3509Bug.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

groovy3509bug, groovytestcase, integer, integer, level1, level1, level2, level2, list, root, root

The Groovy Groovy3509Bug.groovy source code

package groovy.bugs

class Groovy3509Bug extends GroovyTestCase {

    void testGPathInconcistency() {
        def data = [
                [a: null],
                [a: [b: 1]],
                [a: [b: 2]]
        ]
        assert data.a.b.sum() == 3

        data = [
                [a: [b: 1]],
                [a: [b: 2]],
                [a: null]
        ]
        assert data.a.b.sum() == 3

        data = [
                [a: [b: [c:1]]],
                [a: [b: null]],
                [a: [b: [c:2]]]
        ]
        assert data.a.b.c.sum() == 3
    }

    void testOriginalCase() {
        // initialize structure
        def root = new Root()
        for (i in 0..2) {
            def level1 = new Level1()
            level1.level2 = new Level2()
            level1.level2.level3 = i
            root.level1 << level1
        }

        // given
        assert root.level1[0].level2.level3 == 0
        assert root.level1[1].level2.level3 == 1
        assert root.level1[2].level2.level3 == 2

        // then
        assert root?.level1?.level2?.level3.sum() == 3

        // but now we have a null property in between
        root.level1[0].level2 = null

        // even with this intermediary null node, we should still get 3
        assert root?.level1?.level2?.level3.sum() == 3
    }
}

class Root {
  List level1 = []
}

class Level2 {
  Integer level3
}

class Level1 {
  Level2 level2
}