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CodeSonar® 9.2p0 CONFIDENTIAL CodeSecure Inc
Java

JAVA.CLASS.IOF.BAD : Inappropriate Instanceof (Java)

要旨

The code contains an instanceof test that should not be used.

プロパティ

クラス名 Inappropriate Instanceof (Java)
日本語クラス名 Inappropriate Instanceof (Java)
クラス分類 信頼性 (reliability)
ニーモニック JAVA.CLASS.IOF.BAD
カテゴリー
CWE CWE:1076 Insufficient Adherence to Expected Conventions
対応言語 Available for Java and Kotlin.
有効/無効設定 このワーニングクラスのチェックはデフォルトで有効になっています。チェックを無効にするにはプロジェクト設定ファイル （configuration file）に以下の WARNING_FILTER ルールを追加してください。 
WARNING_FILTER += discard class="Inappropriate Instanceof (Java)"

例

Consider the following program:

public class Foo {

  public String s
  
  @Override
  public boolean equals(Object obj) {
      if(obj != null)
          if (obj instanceof String) /* "Inappropriate Instanceof (Java)" warning issued here
                                      * - should only check for Foo or a class derived from Foo.
                                      */
              return s.equals(obj);
      return false;
  }
}

In this example, the programmer should modify equals() as follows.

  @Override
  public boolean equals(Object obj) {
      if(obj != null)
          if (obj instanceof Foo)
              return s.equals(((Foo) obj).s);
    return false;
  }

解決法

Check if the instanceof operator can be actually removed and that it is not the sign of an actual programming bug.

関連のある設定ファイルパラメータ

設定ファイルの以下のパラメータがこのワーニングクラスのチェックに影響します。

 

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