/*
   UnnecessaryNullCheckWithInstanceOf
   
   */
   
   package com.puppycrawl.tools.checkstyle.checks.coding.unnecessarynullcheckwithinstanceof;
   
   import java.util.List;
   import java.util.ArrayList;
  import java.util.Objects;
  import java.util.function.Predicate;
  
  public class InputUnnecessaryNullCheckWithInstanceOfLambda {
      private final List<Object> objects = new ArrayList<>();
      public void simpleLambdas() {
          objects.forEach(obj -> {
              if (obj != null && obj instanceof String) { // violation, 'Unnecessary nullity check'
                  String str = (String) obj;
              }
          });
  
          // violation below, 'Unnecessary nullity check'
          Predicate<Object> isString = obj -> obj != null && obj instanceof String;
  
          // violation below, 'Unnecessary nullity check'
          objects.removeIf(obj -> obj != null && obj instanceof Integer);
      }
      public void validLambdas() {
          objects.forEach(obj -> {
              if (obj instanceof String) {
                  String str = (String) obj;
              }
          });
          objects.stream()
                 .filter(Objects::nonNull)
                 .filter(obj -> obj instanceof String)
                 .forEach(obj -> {
                     String str = (String) obj;
                 });
      }
  }