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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);
}
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