1 /* 2 * Copyright 2016 Google Inc. All Rights Reserved. 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 com.google.turbine.binder.lookup; 18 19 import com.google.common.collect.ImmutableList; 20 import com.google.errorprone.annotations.Immutable; 21 import java.util.NoSuchElementException; 22 23 /** 24 * The key for a qualified name lookup; effectively an immutable iterator over parts of a qualified 25 * name. 26 */ 27 @Immutable 28 public class LookupKey { 29 private final ImmutableList<String> simpleNames; 30 31 public LookupKey(Iterable<String> simpleNames) { 32 this.simpleNames = ImmutableList.copyOf(simpleNames); 33 } 34 35 /** The first simple name in the qualified type name. */ 36 public String first() { 37 return simpleNames.get(0); 38 } 39 40 boolean hasNext() { 41 return simpleNames.size() > 1; 42 } 43 44 /** 45 * A {@link LookupKey} with the first simple name removed. 46 * 47 * <p>Used when resolving qualified top-level names, e.g. {@code java.util.HashMap.Entry} might be 48 * resolved in the following stages, ending with a resolved class and a {@link LookupKey} for any 49 * remaining nested type names (which may not be canonical). 50 * 51 * <ul> 52 * <li>{@code ((PACKAGE java) (KEY util.HashMap.Entry))} 53 * <li>{@code ((PACKAGE java.util) (KEY HashMap.Entry))} 54 * <li>{@code ((CLASS java.util.HashMap) (KEY Entry))} 55 * </ul> 56 */ 57 public LookupKey rest() { 58 if (!hasNext()) { 59 throw new NoSuchElementException(); 60 } 61 return new LookupKey(simpleNames.subList(1, simpleNames.size())); 62 } 63 64 /** The simple names of the type. */ 65 public ImmutableList<String> simpleNames() { 66 return simpleNames; 67 } 68 } 69
