Talend custom function - talend

Question

How i can apply custom function with tmap, or may be with tsystem. I want to decrypt crypted columns on-the-fly with my custom function. I can write all encrypted values to file, then write from file to tsystem, or tmap, and decrypt values. What is the best way for this?

Answer 1

Use Java routines. you can create java methods and call anywhere. for example
public static String decrypt(String encryptStr){
String decrypted = null;
try {
while(encryptStr != null){
try
{
String key = "Bar12345Bar12345"; // 128 bit key
// Create key and cipher
Key aesKey = new SecretKeySpec(key.getBytes(), "AES");
Cipher cipher = Cipher.getInstance("AES");
// encrypt the text
cipher.init(Cipher.ENCRYPT_MODE, aesKey);
// for decryption
byte[] bb = new byte[encryptStr.length()];
for (int i=0; i<encryptStr.length(); i++) {
bb[i] = (byte) encryptStr.charAt(i);
}
// decrypt the text
cipher.init(Cipher.DECRYPT_MODE, aesKey);
decrypted = new String(cipher.doFinal(bb));
}
catch(Exception e)
{
e.printStackTrace();
}
}
} catch (IOException ex) {
Logger.getLogger(Snake_H.class.getName()).log(Level.SEVERE, null, ex);
}
return decrypted;
}
For encrypts follow the same kind of methods. you can call this java method at anywhere like tmap
Reference Talend Routines

Answer 2

If you are speaking about routines, simply call the desired method everywhere you can put some java code.
For example, as an expression for the output flow, you can have something like:yourClass.yourMethod(...)
Hope this helps.