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int item = Math.random()*100

def doCode = { return 'hi' }
Map $_ = [a: 1, b: ['c d': [z: item, doit: doCode]]]

use (UtilCategory) {

    assert $_.dotPath() == [a: 1, b: ['c d': [z: item, doit: doCode]]]
    assert $_.dotPath('') == [a: 1, b: ['c d': [z: item, doit: doCode]]]
    assert $_.dotPath(null) == [a: 1, b: ['c d': [z: item, doit: doCode]]]
    
    assert $_.dotPath('a') == 1
    assert $_.dotPath('b.c d.z') == item
    assert $_.dotPath('b/c d/z', '/') == item
    
    assert $_.dotPath('b.c d.doit')() == 'hi'
    
    assert $_.dotPath('b.c d.y') == null
    assert $_.dotPath('b.c d.z.z') == null
    assert $_.dotPath('b.c d.z.z.') == null
    assert 1.dotPath('toString') == null

}

//========================================

@Category(Object)
class UtilCategory {
    def dotPath(String path = '', String delimiter = /\./) {
        Object myDelegate = this
        
        if (!path) return myDelegate
    
        try {
            return path.split(/$delimiter/).inject(myDelegate) { x, i->
               x = x[i]
            }
        }
        catch (Exception ex) { return null }
    }
}