From 173ee825277d64c8a852f25b6d6e0a85917342ec Mon Sep 17 00:00:00 2001
From: Googler <noreply@google.com>
Date: Tue, 19 May 2015 09:46:33 +0000
Subject: 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
---
 .../common/options/BoolOrEnumConverter.java        | 62 ++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/main/java/com/google/devtools/common/options/BoolOrEnumConverter.java

(limited to 'src/main/java/com/google/devtools/common/options/BoolOrEnumConverter.java')

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;
+      }
+    }
+  }
+}
-- 
cgit v1.2.3