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| import org.checkerframework.checker.nullness.qual.EnsuresNonNullIf;
| import org.checkerframework.checker.nullness.qual.NonNull;
| import org.checkerframework.checker.nullness.qual.Nullable;
|
| package com.google.common.base;
|
| class Strings {
| @EnsuresNonNullIf(result = false, expression = "#1")
| static boolean isNullOrEmpty(@Nullable String str);
| }
|
| class Preconditions {
| static <T extends @NonNull Object> T checkNotNull(T reference, @Nullable Object errorMessage);
| }
|
|
