Question Re: Groovy CPI: String to Integer in Technology Q&A

Groovy CPI: String to Integer

anirban_pwc — Wed, 10 Nov 2021 18:06:15 GMT

Hi Experts -

I'm trying to increment a local variable value by 1, but when I read the header value, it maps to a String "value", then I'm trying to cast it to an Integer with the statement:

counter_var = Integer.parseInt(value)

but receiving a Java exception:

java.lang.Exception: java.lang.NumberFormatException: For input string

Please help me resolve this issue.

Thank you,

Anirban

import com.sap.gateway.ip.core.customdev.util.Message
import java.util.HashMap
def Message processData(Message message) {
       //Headers 
       def map = message.getHeaders()
       def value = map.get("INCREMENT")
       if(value == null)
       { 
           def counter_var = 0       
       }
       else 
       {
           counter_var = Integer.parseInt(value)
       }
       
       message.setHeader("INCREMENT", counter_var + 1)
       return message;
}

Re: Groovy CPI: String to Integer

sunny_kapoor — Wed, 10 Nov 2021 18:25:16 GMT

Hi amallick,

Script looks fine just move the counter_var declaration outside.

If you still see the error just check the value of INCREMENT header in the Trace mode, may be it is not having the proper number in String fromat.

import com.sap.gateway.ip.core.customdev.util.Message;
import java.util.HashMap;

def Message processData(Message message) {
       def map = message.getHeaders()
       def value = map.get("INCREMENT");
       def counter_var;
       if(value == null)
       { 
         counter_var = 0       
       }
       else 
       {
           counter_var = Integer.parseInt(value)
       }
       
       message.setHeader("INCREMENT", counter_var + 1)
       return message;
}

Re: Groovy CPI: String to Integer

former_member683114 — Wed, 10 Nov 2021 20:23:49 GMT

Hi amallick,

As sunny.kapoor2 mentioned Declaration of counter_var should be outside. And
If condition should verify empty string condition as well. - if(value == null || value == "")
It's also better to use an additional condition value.isNumber() == true and handle the case before casting the string to integer. Below Nested condition is just an example. You can make changes and optimize the code as required.

import com.sap.gateway.ip.core.customdev.util.Message;
import java.util.HashMap;

def Message processData(Message message) {
       def map = message.getHeaders()
       def value = map.get("INCREMENT");
       def counter_var;
       if(value == null || value == "")
       { 
         counter_var = 0       
       }
       else 
       {
          if(value.isNumber() == false)
		{
		  //make the counter to zero / raise custom exception / take any other action
		}
	    else
		counter_var = Integer.parseInt(value)
       }
       
       message.setHeader("INCREMENT", counter_var + 1)
       return message;
}

Re: Groovy CPI: String to Integer

anirban_pwc — Wed, 10 Nov 2021 20:52:08 GMT

Thank you, sunny.kapoor2 and @ganesh m for your kind responses.

This is the script that finally worked for me:

import com.sap.gateway.ip.core.customdev.util.Message;
import java.util.HashMap;

def Message processData(Message message) {
       def map = message.getHeaders()
       String value = map.get("INCREMENT");
       def counter_var;
       if(value == null || value == "")
       { 
         counter_var = 0       
       }
       else 
       {
		  counter_var = Integer.parseInt(value)
       }
       
       message.setHeader("INCREMENT", counter_var + 1)
       return message;
}