| /* |
| * Copyright 2013 Google Inc. |
| * |
| * 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.gwt.dev.javac.typemodel; |
| |
| import com.google.gwt.core.ext.typeinfo.HasAnnotations; |
| import com.google.gwt.dev.util.collect.HashMap; |
| import com.google.gwt.dev.util.collect.Maps; |
| |
| import java.lang.annotation.Annotation; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| |
| /** |
| * Immutable implementation of the {@link HasAnnotations} |
| * interface. Does not support inheritance. |
| */ |
| class ImmutableAnnotations implements HasAnnotations { |
| |
| public static final ImmutableAnnotations EMPTY = new ImmutableAnnotations() { |
| @Override |
| public Annotation[] getDeclaredAnnotations() { |
| return new Annotation[0]; |
| } |
| }; |
| |
| private final Map<Class<? extends Annotation>, Annotation> members; |
| |
| private ImmutableAnnotations() { |
| this.members = Maps.create(); |
| } |
| |
| private ImmutableAnnotations(ImmutableAnnotations base, |
| Map<Class<? extends Annotation>, Annotation> additions) { |
| this.members = copyOfAnnotations(base, additions); |
| } |
| |
| /** |
| * Returns a possibly new instance with additional annotations. |
| * (If additions is null or empty, the original will be returned.) |
| */ |
| public ImmutableAnnotations plus(Map<Class<? extends Annotation>, Annotation> additions) { |
| if (additions == null || additions.size() == 0) { |
| return this; |
| } |
| return new ImmutableAnnotations(this, additions); |
| } |
| |
| @Override |
| public <T extends Annotation> T getAnnotation(Class<T> annotationClass) { |
| return annotationClass.cast(members.get(annotationClass)); |
| } |
| |
| @Override |
| public Annotation[] getAnnotations() { |
| return getDeclaredAnnotations(); |
| } |
| |
| @Override |
| public Annotation[] getDeclaredAnnotations() { |
| List<Annotation> values = new ArrayList<Annotation>(members.values()); |
| Collections.sort(values, Annotations.ANNOTATION_COMPARATOR); |
| return values.toArray(new Annotation[values.size()]); |
| } |
| |
| @Override |
| public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) { |
| return getAnnotation(annotationClass) != null; |
| } |
| |
| private static Map<Class<? extends Annotation>, Annotation> copyOfAnnotations( |
| ImmutableAnnotations base, Map<Class<? extends Annotation>, Annotation> additions) { |
| Map<Class<? extends Annotation>, Annotation> result = |
| new HashMap<Class<? extends Annotation>, Annotation>(); |
| result.putAll(base.members); |
| for (Annotation addition : additions.values()) { |
| Class<? extends Annotation> type = addition.annotationType(); |
| assert (type != null); |
| assert (!result.containsKey(type)); |
| result.put(type, addition); |
| } |
| return Maps.normalize(result); |
| } |
| } |