63 lines
2.4 KiB
Java
63 lines
2.4 KiB
Java
// Copyright 2014 The Bazel 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 com.google.devtools.common.options;
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import com.google.devtools.common.options.Converters.BooleanConverter;
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/**
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* Converter that can also convert from booleans and enumerations.
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*
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* <p> This is able to additionally convert from the standard set of
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* boolean string values. If there is an overlap in values, those from
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* the underlying enumeration will be taken.
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*/
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public abstract class BoolOrEnumConverter<T extends Enum<T>> extends EnumConverter<T>{
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private T falseValue;
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private T trueValue;
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/**
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* You *must* implement a zero-argument constructor that delegates
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* to this constructor, passing in the appropriate parameters. This
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* comes from the base {@link EnumConverter} class.
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*
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* @param enumType The type of your enumeration; usually a class literal
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* like MyEnum.class
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* @param typeName The intuitive name of your enumeration, for example, the
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* type name for CompilationMode might be "compilation mode".
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* @param trueValue The enumeration value to associate with {@code true}.
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* @param falseValue The enumeration value to associate with {@code false}.
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*/
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protected BoolOrEnumConverter(Class<T> enumType, String typeName, T trueValue, T falseValue) {
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super(enumType, typeName);
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this.trueValue = trueValue;
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this.falseValue = falseValue;
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}
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@Override
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public T convert(String input) throws OptionsParsingException {
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try {
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return super.convert(input);
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} catch (OptionsParsingException eEnum) {
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try {
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BooleanConverter booleanConverter = new BooleanConverter();
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boolean value = booleanConverter.convert(input);
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return value ? trueValue : falseValue;
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} catch (OptionsParsingException eBoolean) {
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throw eEnum;
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}
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}
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}
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}
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