d20-charsheet/src/main/lombok/org/leumasjaffe/charsheet/observer/helper/IntValueHelper.java

package org.leumasjaffe.charsheet.observer.helper;

import java.util.function.BiFunction;

import org.leumasjaffe.charsheet.model.observable.IntValue;

public class IntValueHelper implements BiFunction<String, IntValue, Boolean> {
    public Boolean apply( final String str, final IntValue ref ) {
      if ( ! Character.isDigit(str.charAt(0)) ) return false;
      final int newValue = Integer.parseInt( str );
      if ( newValue == ref.value( ) ) return false;
      ref.value( newValue );
      return true;
    }
  }