NullPointerTester.java 文件源码

/**
 * Returns true if the the given member is a method that overrides {@link Object#equals(Object)}.
 *
 * <p>The documentation for {@link Object#equals} says it should accept null, so don't require an
 * explicit {@code @Nullable} annotation (see <a
 * href="https://github.com/google/guava/issues/1819">#1819</a>).
 *
 * <p>It is not necessary to consider visibility, return type, or type parameter declarations. The
 * declaration of a method with the same name and formal parameters as {@link Object#equals} that
 * is not public and boolean-returning, or that declares any type parameters, would be rejected at
 * compile-time.
 */
private static boolean isEquals(Member member) {
  if (!(member instanceof Method)) {
    return false;
  }
  Method method = (Method) member;
  if (!method.getName().contentEquals("equals")) {
    return false;
  }
  Class<?>[] parameters = method.getParameterTypes();
  if (parameters.length != 1) {
    return false;
  }
  if (!parameters[0].equals(Object.class)) {
    return false;
  }
  return true;
}