net.bither.model.TrendingGraphicData.java Source code

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Here is the source code for net.bither.model.TrendingGraphicData.java

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/*
 * Copyright 2014 http://Bither.net
 *
 * 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 net.bither.model;

import net.bither.util.ExchangeUtil;
import net.bither.util.TrendingGraphicUtil;

import org.json.JSONArray;
import org.json.JSONException;

import static com.google.common.base.Preconditions.checkState;

public class TrendingGraphicData {

    private static long EXPORED_TIME = 1 * 60 * 60 * 1000;

    private static TrendingGraphicData EmptyData;

    private double high;
    private double low;
    private double[] prices;

    private double[] rates;

    private long createTime = -1;

    public TrendingGraphicData(double high, double low, double[] prices) {
        checkState(prices.length == TrendingGraphicUtil.TRENDING_GRAPIC_COUNT);
        this.high = high;
        this.low = low;
        this.prices = prices;
        this.createTime = System.currentTimeMillis();

        caculateRate();
    }

    public double getHigh() {
        return high;
    }

    public double getLow() {
        return low;
    }

    public double[] getPrices() {
        return prices;
    }

    public double[] getRates() {
        return rates;
    }

    private void caculateRate() {
        int count = prices.length;
        rates = new double[count];
        double interval = high - low;
        for (int i = 0; i < count; i++) {
            rates[i] = Math.max(0, prices[i] - low) / interval;
        }
    }

    public boolean isExpired() {
        return this.createTime == -1 || this.createTime + EXPORED_TIME < System.currentTimeMillis();
    }

    public static TrendingGraphicData format(JSONArray jsonArray) throws JSONException {
        double high = 0;
        double low = Double.MAX_VALUE;
        double rate = ExchangeUtil.getExchangeRate();
        double[] prices = new double[jsonArray.length()];
        for (int i = 0; i < jsonArray.length(); i++) {
            double price = jsonArray.getDouble(i) / 100 * rate;
            if (price == 0) {
                if (i == 0) {
                    int j = i;
                    while (price == 0 && j < jsonArray.length()) {
                        price = jsonArray.getDouble(j) / 100 * rate;
                        j++;
                    }

                } else {
                    int j = i - 1;
                    price = jsonArray.getDouble(i - 1) / 100 * rate;
                    while (price == 0 && j > 0) {
                        price = jsonArray.getDouble(j) / 100 * rate;
                        j--;
                    }
                }
            }
            prices[i] = price;
            if (high < price) {
                high = price;
            }
            if (low > price) {
                low = price;
            }
        }
        TrendingGraphicData trendingGraphicData = new TrendingGraphicData(high, low, prices);
        return trendingGraphicData;

    }

    public static TrendingGraphicData getEmptyData() {
        if (EmptyData == null) {
            double[] prices = new double[TrendingGraphicUtil.TRENDING_GRAPIC_COUNT];
            for (int i = 0; i < prices.length; i++) {
                prices[i] = 0.5;
            }
            EmptyData = new TrendingGraphicData(1, 0, prices);
        }
        return EmptyData;
    }

}