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PlotSquared, a land and world management plugin for Minecraft.
There is a newer version: 6.11.2
/*
 *       _____  _       _    _____                                _
 *      |  __ \| |     | |  / ____|                              | |
 *      | |__) | | ___ | |_| (___   __ _ _   _  __ _ _ __ ___  __| |
 *      |  ___/| |/ _ \| __|\___ \ / _` | | | |/ _` | '__/ _ \/ _` |
 *      | |    | | (_) | |_ ____) | (_| | |_| | (_| | | |  __/ (_| |
 *      |_|    |_|\___/ \__|_____/ \__, |\__,_|\__,_|_|  \___|\__,_|
 *                                    | |
 *                                    |_|
 *            PlotSquared plot management system for Minecraft
 *               Copyright (C) 2014 - 2022 IntellectualSites
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program.  If not, see .
 */
package com.plotsquared.core.player;

import com.google.common.base.Objects;
import com.google.common.base.Preconditions;
import com.google.inject.TypeLiteral;
import com.plotsquared.core.synchronization.LockKey;
import org.checkerframework.checker.nullness.qual.NonNull;

import java.util.HashMap;
import java.util.Map;

/**
 * Key used to access meta data
 *
 * @param  Meta data type
 */
public final class MetaDataKey {

    private static final Map> keyMap = new HashMap<>();
    private static final Object keyMetaData = new Object();

    private final String key;
    private final TypeLiteral type;
    private final LockKey lockKey;

    private MetaDataKey(final @NonNull String key, final @NonNull TypeLiteral type) {
        this.key = Preconditions.checkNotNull(key, "Key may not be null");
        this.type = Preconditions.checkNotNull(type, "Type may not be null");
        this.lockKey = LockKey.of(this.key);
    }

    /**
     * Get a new named lock key
     *
     * @param key  Key name
     * @param type type
     * @param   Type
     * @return MetaData key instance
     */
    @SuppressWarnings("unchecked")
    public static @NonNull  MetaDataKey of(final @NonNull String key, final @NonNull TypeLiteral type) {
        synchronized (keyMetaData) {
            return (MetaDataKey)
                    keyMap.computeIfAbsent(key, missingKey -> new MetaDataKey<>(missingKey, type));
        }
    }

    @Override
    public String toString() {
        return this.key;
    }

    @Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        final MetaDataKey lockKey = (MetaDataKey) o;
        return Objects.equal(this.key, lockKey.key);
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(this.key);
    }

    /**
     * Get the {@link LockKey} associated with this key
     *
     * @return Lock key
     */
    public @NonNull LockKey getLockKey() {
        return this.lockKey;
    }

    /**
     * Get the meta data type
     *
     * @return Meta data type
     */
    public @NonNull TypeLiteral getType() {
        return this.type;
    }

}