Java tutorial
/** * Copyright 2014 Zaradai * * Licensed 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.zaradai.kunzite.trader.orders.book; import com.google.common.collect.Maps; import com.zaradai.kunzite.trader.orders.model.Order; import java.util.Map; public final class DefaultOrderBook extends AbstractOrderBook { @Override protected Map<Double, PriceEntry> createEntryMap() { return Maps.newHashMap(); } @Override protected Map<String, Order> createOrderMap() { return Maps.newHashMap(); } @Override protected PriceEntry getOrCreateAtEntryPrice(double entryPrice) { Map<Double, PriceEntry> limitOrders = getLimitOrders(); PriceEntry entry = limitOrders.get(entryPrice); if (entry == null) { entry = new PriceEntry(entryPrice); limitOrders.put(entryPrice, entry); } return entry; } }