Groovy function with parameter - groovy

Question

I have a class which is paring csv based file, but I would like to put a parameter for the token symbol.
Please let me know how can I change the function and use the function on program.
class CSVParser{
static def parseCSV(file,closure) {
def lineCount = 0
file.eachLine() { line ->
def field = line.tokenize(';')
lineCount++
closure(lineCount,field)
}
}
}
use(CSVParser.class) {
File file = new File("test.csv")
file.parseCSV { index,field ->
println "row: ${index} | ${field[0]} ${field[1]} ${field[2]}"
}
}

Answer 1

You'll have to add the parameter in between the file and closure parameters.
When you create a category class with static methods, the first parameter is the object the method is being called on so file must be first.
Having a closure as the last parameter allows the syntax where the open brace of the closure follows the function invocation without parentheses.
Here's how it would look:
class CSVParser{
static def parseCSV(file,separator,closure) {
def lineCount = 0
file.eachLine() { line ->
def field = line.tokenize(separator)
lineCount++
closure(lineCount,field)
}
}
}
use(CSVParser) {
File file = new File("test.csv")
file.parseCSV(',') { index,field ->
println "row: ${index} | ${field[0]} ${field[1]} ${field[2]}"
}
}

Answer 2

Just add the separator as the second parameter to the parseCSV method:
class CSVParser{
static def parseCSV(file, sep, closure) {
def lineCount = 0
file.eachLine() { line ->
def field = line.tokenize(sep)
closure(++lineCount, field)
}
}
}
use(CSVParser.class) {
File file = new File("test.csv")
file.parseCSV(";") { index,field ->
println "row: ${index} | ${field[0]} ${field[1]} ${field[2]}"
}
}