Typecasting in Groovy - groovy

Question

I am trying to parse an yaml file in Groovy. However I am facing issue while typecasting the result to Map object.
Here is my logic
import org.yaml.snakeyaml.Yaml
import java.util.Map
Reader reader = null
int tokenCount = 0
def Map map = null
StringTokenizer st = new java.util.StringTokenizer("Country.State.City", ".")
reader = new FileReader("filepath")
String val = null
Yaml yaml = new Yaml()
map = (Map) yaml.load(reader)
tokenCount = st.countTokens()
for (i=1; i < tokenCount; i++) {
String token = st.nextToken()
map = (Map) map.get(token)
}
val = map.get(st.nextToken()).toString()
However I am getting error at line:
map = (Map) map.get(token)
where it says:
"org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'some value' with class 'java.lang.String' to class 'java.util.Map' error at line: 15"..
Where I am going wrong?

Answer 1

your provided yaml file is syntactically incorrect. This is a fixed version:
location: C:\\Users\\amah11\\Desktop\\New folder
type: hi
Header:
Code:
Start: 0
End: 2
value: H00
Owner:
Start: 3
End: 5
value: AIM
User:
Start: 6
End: 8
Value: AIM
number: 1
Note that Code: **Static** in the original messes things up. And all the keys on the final level need a space after the : (e.g. Start:3 is wrong).
The actual error message is:
Caught: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'Static Start:0 End:2 value:H00' with class 'java.lang.String' to class 'java.util.Map'
which is rather clear in showing, that there is something wrong with the original file.
You might want to consider using an editor, that detects errors like this right away.
An alternative to the original code, would be the use of inject on the tokenizer:
def map = new Yaml().load(new FileReader("cardconfig.yml"))
println new StringTokenizer('Header.Code.End', '.').inject(map) { r, s -> r.get(s) }
BTW: you don't need to import java.util in groovy.