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c0f8da0c6e
This was a surprisingly involved change. Some of the difficulties included java.util.Optional purposely not being Serializable (so I had to move a few Optionals in mapreduce classes to @Nullable) and having to add the Truth Java8 extension library for assertion support. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=171863777
73 lines
3 KiB
Java
73 lines
3 KiB
Java
// Copyright 2017 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.util;
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import static com.google.common.base.Preconditions.checkArgument;
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import java.util.Optional;
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import javax.annotation.Nullable;
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/** Utility methods related to preconditions checking. */
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public class PreconditionsUtils {
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/**
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* Checks whether the provided reference is null, throws IAE if it is, and returns it if not.
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*
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* <p>This method and its overloads are to substitute for checkNotNull() in cases where it's
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* preferable to throw an IAE instead of an NPE, such as where we want an IAE to indicate that
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* it's just a bad argument/parameter and reserve NPEs for bugs and unexpected null values.
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*/
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public static <T> T checkArgumentNotNull(T reference) {
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checkArgument(reference != null);
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return reference;
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}
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/** Checks whether the provided reference is null, throws IAE if it is, and returns it if not. */
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public static <T> T checkArgumentNotNull(T reference, @Nullable Object errorMessage) {
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checkArgument(reference != null, errorMessage);
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return reference;
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}
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/** Checks whether the provided reference is null, throws IAE if it is, and returns it if not. */
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public static <T> T checkArgumentNotNull(
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T reference, @Nullable String errorMessageTemplate, @Nullable Object... errorMessageArgs) {
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checkArgument(reference != null, errorMessageTemplate, errorMessageArgs);
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return reference;
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}
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/** Checks if the provided Optional is present, returns its value if so, and throws IAE if not. */
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public static <T> T checkArgumentPresent(Optional<T> reference) {
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checkArgumentNotNull(reference);
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checkArgument(reference.isPresent());
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return reference.get();
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}
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/** Checks if the provided Optional is present, returns its value if so, and throws IAE if not. */
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public static <T> T checkArgumentPresent(Optional<T> reference, @Nullable Object errorMessage) {
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checkArgumentNotNull(reference, errorMessage);
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checkArgument(reference.isPresent(), errorMessage);
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return reference.get();
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}
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/** Checks if the provided Optional is present, returns its value if so, and throws IAE if not. */
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public static <T> T checkArgumentPresent(
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Optional<T> reference,
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@Nullable String errorMessageTemplate,
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@Nullable Object... errorMessageArgs) {
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checkArgumentNotNull(reference, errorMessageTemplate, errorMessageArgs);
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checkArgument(reference.isPresent(), errorMessageTemplate, errorMessageArgs);
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return reference.get();
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}
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}
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