/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j 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 <http://www.gnu.org/licenses/>.
 */
package org.neo4j.util;

import static java.util.Objects.requireNonNull;

import java.util.Objects;
import java.util.UUID;

public class Id {
    protected final UUID uuid;
    private String shortName;

    public Id(UUID uuid) {
        requireNonNull(uuid, "UUID should be not null.");
        this.uuid = uuid;
    }

    public UUID uuid() {
        return uuid;
    }

    /**
     * Returns true if this id has the first 8 characters equals to the provided ones
     */
    public boolean startsWith(String prefix) {
        return Objects.equals(shortName(), prefix);
    }

    public String shortName() {
        if (shortName == null) {
            shortName = uuid.toString().substring(0, 8);
        }
        return shortName;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        Id id = (Id) o;
        return Objects.equals(uuid, id.uuid);
    }

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

    @Override
    public String toString() {
        return shortName();
    }
}
