| // Copyright 2014 The Bazel Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.devtools.common.options; |
| |
| import com.google.devtools.common.options.Converters.BooleanConverter; |
| |
| /** |
| * Converter that can also convert from booleans and enumerations. |
| * |
| * <p> This is able to additionally convert from the standard set of |
| * boolean string values. If there is an overlap in values, those from |
| * the underlying enumeration will be taken. |
| */ |
| public abstract class BoolOrEnumConverter<T extends Enum<T>> extends EnumConverter<T>{ |
| private T falseValue; |
| private T trueValue; |
| |
| /** |
| * You *must* implement a zero-argument constructor that delegates |
| * to this constructor, passing in the appropriate parameters. This |
| * comes from the base {@link EnumConverter} class. |
| * |
| * @param enumType The type of your enumeration; usually a class literal |
| * like MyEnum.class |
| * @param typeName The intuitive name of your enumeration, for example, the |
| * type name for CompilationMode might be "compilation mode". |
| * @param trueValue The enumeration value to associate with {@code true}. |
| * @param falseValue The enumeration value to associate with {@code false}. |
| */ |
| protected BoolOrEnumConverter(Class<T> enumType, String typeName, T trueValue, T falseValue) { |
| super(enumType, typeName); |
| this.trueValue = trueValue; |
| this.falseValue = falseValue; |
| } |
| |
| @Override |
| public T convert(String input) throws OptionsParsingException { |
| try { |
| return super.convert(input); |
| } catch (OptionsParsingException eEnum) { |
| try { |
| BooleanConverter booleanConverter = new BooleanConverter(); |
| boolean value = booleanConverter.convert(input); |
| return value ? trueValue : falseValue; |
| } catch (OptionsParsingException eBoolean) { |
| throw eEnum; |
| } |
| } |
| } |
| } |