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c458c05801
The dark lord Gosling designed the Java package naming system so that ownership flows from the DNS system. Since we own the domain name registry.google, it seems only appropriate that we should use google.registry as our package name.
48 lines
1.6 KiB
Java
48 lines
1.6 KiB
Java
// Copyright 2016 The Domain Registry 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 com.google.common.base.Optional;
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import google.registry.util.TypeUtils.TypeInstantiator;
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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.absent();
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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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