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/**
 * Copyright 2016 Shopify
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the Software
 * is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package com.shopify.graphql.support;

import java.io.Serializable;

/**
 * Created by dylansmith on 2016-11-01.
 */

public class ID implements Serializable {
    protected final String id;

    public ID(String id) {
        this.id = id;
    }

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

    @Override
    public boolean equals(Object o) {
        if (super.equals(o)) {
            return true;
        }
        return o instanceof ID && id.equals(((ID) o).id);
    }

    // like `a.equals(b)` except handles nulls
    public static boolean equals(ID a, ID b) {
        if (a == null) {
            return b == null;
        }
        return a.equals(b);
    }

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