| /* |
| * Copyright (C) 2008 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.inject.internal; |
| |
| import static java.lang.annotation.RetentionPolicy.RUNTIME; |
| |
| import com.google.inject.BindingAnnotation; |
| import java.lang.annotation.Annotation; |
| import java.lang.annotation.Retention; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** @author jessewilson@google.com (Jesse Wilson) */ |
| public class UniqueAnnotations { |
| private UniqueAnnotations() {} |
| |
| private static final AtomicInteger nextUniqueValue = new AtomicInteger(1); |
| |
| /** |
| * Returns an annotation instance that is not equal to any other annotation instances, for use in |
| * creating distinct {@link com.google.inject.Key}s. |
| */ |
| public static Annotation create() { |
| return create(nextUniqueValue.getAndIncrement()); |
| } |
| |
| static Annotation create(final int value) { |
| return new Internal() { |
| @Override |
| public int value() { |
| return value; |
| } |
| |
| @Override |
| public Class<? extends Annotation> annotationType() { |
| return Internal.class; |
| } |
| |
| @Override |
| public String toString() { |
| return "@" + Internal.class.getName() + "(value=" + value + ")"; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| return o instanceof Internal && ((Internal) o).value() == value(); |
| } |
| |
| @Override |
| public int hashCode() { |
| return (127 * "value".hashCode()) ^ value; |
| } |
| }; |
| } |
| |
| @Retention(RUNTIME) |
| @BindingAnnotation |
| @interface Internal { |
| int value(); |
| } |
| } |