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/**
* 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 com.google.inject.BindingAnnotation;
import java.lang.annotation.Annotation;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
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() {
public int value() {
return value;
}
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();
}
}
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