1 /* 2 * Copyright (C) 2016 The Dagger Authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package dagger.internal.codegen.base; 18 19 import java.util.HashSet; 20 import java.util.Set; 21 22 /** A collector for names to be used in the same namespace that should not conflict. */ 23 public final class UniqueNameSet { 24 private final Set<String> uniqueNames = new HashSet<>(); 25 26 /** 27 * Generates a unique name using {@code base}. If {@code base} has not yet been added, it will be 28 * returned as-is. If your {@code base} is healthy, this will always return {@code base}. 29 */ getUniqueName(CharSequence base)30 public String getUniqueName(CharSequence base) { 31 String name = base.toString(); 32 for (int differentiator = 2; !uniqueNames.add(name); differentiator++) { 33 name = base.toString() + differentiator; 34 } 35 return name; 36 } 37 38 /** 39 * Adds {@code name} without any modification to the name set. Has no effect if {@code name} is 40 * already present in the set. 41 */ claim(CharSequence name)42 public void claim(CharSequence name) { 43 uniqueNames.add(name.toString()); 44 } 45 } 46