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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you 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.facebook.presto.hadoop.$internal.com.facebook.presto.hadoop.$internal.com.facebook.presto.hadoop.$internal.io.netty.util;

import com.facebook.presto.hadoop.$internal.com.facebook.presto.hadoop.$internal.com.facebook.presto.hadoop.$internal.io.netty.util.internal.PlatformDependent;

import java.util.concurrent.ConcurrentMap;

/**
 * Key which can be used to access {@link Attribute} out of the {@link AttributeMap}. Be aware that it is not be
 * possible to have multiple keys with the same name.
 *
 *
 * @param    the type of the {@link Attribute} which can be accessed via this {@link AttributeKey}.
 */
@SuppressWarnings({ "UnusedDeclaration", "deprecation" }) // 'T' is used only at compile time
public final class AttributeKey extends UniqueName {

    private static final ConcurrentMap names = PlatformDependent.newConcurrentHashMap();

    /**
     * Creates a new {@link AttributeKey} with the specified {@code name}.
     */
    @SuppressWarnings("deprecation")
    public static  AttributeKey valueOf(String name) {
        return new AttributeKey(name);
    }

    /**
     * @deprecated Use {@link #valueOf(String)} instead.
     */
    @Deprecated
    public AttributeKey(String name) {
        super(names, name);
    }
}