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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
47 lines
1.6 KiB
Java
47 lines
1.6 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.tools.params;
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import google.registry.util.TypeUtils.TypeInstantiator;
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import java.util.Optional;
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/**
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* Class for parameters that can handle special string "null" or empty values to
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* indicate a desire to pass an empty value (i.e. when clearing out nullable
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* fields on a resource).
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*/
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public class OptionalParameterConverterValidator<T, C extends ParameterConverterValidator<T>>
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extends ParameterConverterValidator<Optional<T>> {
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private static final String NULL_STRING = "null";
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ParameterConverterValidator<T> validator = new TypeInstantiator<C>(getClass()){}.instantiate();
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@Override
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public void validate(String name, String value) {
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if (!value.isEmpty() && !value.equals(NULL_STRING)) {
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validator.validate(name, value);
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}
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}
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@Override
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public final Optional<T> convert(String value) {
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if (value.equals(NULL_STRING) || value.isEmpty()) {
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return Optional.empty();
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} else {
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return Optional.of(validator.convert(value));
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}
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}
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}
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