org.elasticsearch.common.inject.multibindings.RealElement Maven / Gradle / Ivy

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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 org.elasticsearch.common.inject.multibindings;

import java.lang.annotation.Annotation;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author [email protected] (Jesse Wilson)
 */
class RealElement implements Element {
    private static final AtomicInteger nextUniqueId = new AtomicInteger(1);

    private final int uniqueId;

    RealElement() {
        uniqueId = nextUniqueId.getAndIncrement();
    }

    @Override
    public int uniqueId() {
        return uniqueId;
    }

    @Override
    public Class annotationType() {
        return Element.class;
    }

    @Override
    public String toString() {
        return "@" + Element.class.getName() + "(uniqueId=" + uniqueId + ")";
    }

    @Override
    public boolean equals(Object o) {
        return ((Element) o).uniqueId() == uniqueId();
    }

    @Override
    public int hashCode() {
        return Integer.hashCode(uniqueId);
    }
}