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Java project for connecting the Coinbase V2 API

There is a newer version: 1.2

package com.coinbase.domain.trade;

import java.util.*;
/**
 * The MIT License (MIT)
 *
 *	Copyright (c) 2021 antlen
 *
 *	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.
 *
 * ------------------------------------------------
 *
 * Takes N CbTrade or List of CbTrade  objects and returns as a unified collection
 * @author antlen
 */
public class CbTradeCollection {
    private final List trades = new ArrayList<>();
    private final List> groups = new ArrayList<>();

    public CbTradeCollection add(CbTrade t){
        trades.add(t);
        return this;
    }

    public CbTradeCollection add(Collection t){
        groups.add(t);
        return this;
    }

    public Collection toCollection(){
        TreeSet res = new TreeSet<>(Comparator.comparing(CbTrade::getCreationDateTime));

        for(Collection t : groups){
            res.addAll(t);
        }

        for(CbTrade t : trades){
            res.add(t);
        }
        return res;
    }
}