Class FrequencyValidator

java.lang.Object
  TwoColumnValidator
      FrequencyValidator

All Implemented Interfaces:

Validator

public class FrequencyValidator
extends TwoColumnValidator

Validator for parsing symbol-frequency pairs. If valid, produces ValidatorResult having result type LinkedHashMap<String,Integer>. Entries should be given one per line using format as:

    a 25
    b 76
    e 135
 

Blank lines are ignored. Lines with only a frequency are presumed to have string " " as the symbol. FreqValidator ensures that symbols are unique and frequencies are positive integers. Note that symbols can be any distinct strings (not just characters).

Constructor Summary

FrequencyValidator()

Method Summary

LinkedHashMap<String,Integer>

parse(String original) Parses symbol-frequency data.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FrequencyValidator

public FrequencyValidator()

Method Detail

parse

public LinkedHashMap<String,Integer> parse(String original)
                                    throws ValidatorException

Parses symbol-frequency data. Assumes format described in class overview.

Specified by:

parse in interface Validator

Overrides:

parse in class TwoColumnValidator

Parameters:

original - String

Returns:

LinkedHashMap<String,Integer> describing frequency values

Throws:

ValidatorException - if frequencies are not positive integers, or if any error conditions detected through TwoColumnValidator.parse(String)