1 // Copyright 2017 The Bazel Authors. All rights reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 package com.google.devtools.common.options; 15 16 import com.google.common.collect.ImmutableList; 17 18 /** 19 * A function from an option parser's static setup (what flags it knows about) to a list of 20 * expansion Strings to use for one of its options. 21 */ 22 @FunctionalInterface 23 public interface ExpansionFunction { 24 25 /** 26 * Compute the expansion for an option. May be called at any time during or after the {@link 27 * OptionsParser}'s construction, or not at all. 28 * 29 * @param optionsData the parser's indexed information about its own options, before expansion 30 * information is computed 31 * @return An expansion to use on an empty list 32 */ 33 ImmutableList<String> getExpansion(IsolatedOptionsData optionsData); 34 } 35
