diff options
author | Googler <noreply@google.com> | 2015-05-19 09:46:33 +0000 |
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committer | Han-Wen Nienhuys <hanwen@google.com> | 2015-05-21 09:44:32 +0000 |
commit | 173ee825277d64c8a852f25b6d6e0a85917342ec (patch) | |
tree | ee1c3b375d9ba2a3643954c88ecefaf1dca87d03 /src/main/java/com/google/devtools/common/options/BoolOrEnumConverter.java | |
parent | ddae7544cb4b61c8f7e42d98a033a11a0f58bc57 (diff) |
Add a converter for enum flags that can also be boolean.
A new converter class is added that makes it possible for enum flags to define a conversion from booleans to one of the enumeration values. This is in addition to the enumeration conversions.
Fields that define such a converter can be used with the --flag and --noflag
forms in addition to their --flag=value enumeration style.
--
MOS_MIGRATED_REVID=93972718
Diffstat (limited to 'src/main/java/com/google/devtools/common/options/BoolOrEnumConverter.java')
-rw-r--r-- | src/main/java/com/google/devtools/common/options/BoolOrEnumConverter.java | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/common/options/BoolOrEnumConverter.java b/src/main/java/com/google/devtools/common/options/BoolOrEnumConverter.java new file mode 100644 index 0000000000..1a11ee8a18 --- /dev/null +++ b/src/main/java/com/google/devtools/common/options/BoolOrEnumConverter.java @@ -0,0 +1,62 @@ +// Copyright 2014 Google Inc. 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; + } + + 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; + } + } + } +} |