catalog-be/src/main/java/org/openecomp/sdc/be/components/utils/Utils.java

   1 package org.openecomp.sdc.be.components.utils;
   2
   3 import org.apache.tinkerpop.shaded.minlog.Log;
   4
   5 import javax.validation.constraints.NotNull;
   6 import java.security.SecureRandom;
   7 import java.util.List;
   8 import java.util.regex.Matcher;
   9 import java.util.regex.Pattern;
  10
  11 public class Utils {
  12
  13     private static final Pattern COUNTER_PATTERN = Pattern.compile("\\d+$");
  14     private static final SecureRandom random = new SecureRandom();
  15
  16
  17     private Utils() {}
  18
  19     public static int getNextCounter(@NotNull List<String> existingValues) {
  20         if (existingValues.isEmpty()) {
  21             return 0;
  22         }
  23         int maxCurrentCounter = 0;
  24         try {
  25             maxCurrentCounter = existingValues.stream()
  26                     .map(COUNTER_PATTERN::matcher)
  27                     .filter(Matcher::find)
  28                     .map(matcher -> matcher.group(0))
  29                     .mapToInt(Integer::parseInt)
  30                     .max()
  31                     .orElse(0);
  32         }
  33         catch (Exception e) {
  34             Log.warn("Failed in retrieivng counter from existing value: ", e);
  35             maxCurrentCounter = random.nextInt(100) + 50;
  36         }
  37         return ++maxCurrentCounter;
  38     }
  39 }