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eed2e0c45f
They can be inferred correctly even in Java 7, and display as compiler warnings in IntelliJ. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=173451087
56 lines
1.9 KiB
Java
56 lines
1.9 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 google.registry.util.PreconditionsUtils.checkArgumentNotNull;
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import com.google.common.collect.ImmutableMap;
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import javax.xml.bind.annotation.XmlEnumValue;
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/** Efficient lookup from xml enums to java enums */
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public final class XmlToEnumMapper<T extends Enum<?>> {
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private final ImmutableMap<String, T> map;
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/** Look up T from the {@link XmlEnumValue} */
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public T xmlToEnum(String value) {
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return map.get(value);
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}
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/**
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* Creates a new {@link XmlToEnumMapper} from xml value to enum value.
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*/
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public static <T extends Enum<?>> XmlToEnumMapper<T> create(T[] enumValues) {
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return new XmlToEnumMapper<>(enumValues);
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}
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private XmlToEnumMapper(T[] enumValues) {
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ImmutableMap.Builder<String, T> mapBuilder = new ImmutableMap.Builder<>();
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for (T value : enumValues) {
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try {
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XmlEnumValue xmlAnnotation = value
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.getDeclaringClass()
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.getField(value.name())
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.getAnnotation(XmlEnumValue.class);
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checkArgumentNotNull(xmlAnnotation, "Cannot map enum value to xml name: " + value);
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String xmlName = xmlAnnotation.value();
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mapBuilder = mapBuilder.put(xmlName, value);
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} catch (NoSuchFieldException e) {
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throw new RuntimeException(e);
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}
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}
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map = mapBuilder.build();
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}
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}
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