ymanv.forex.provider.impl.EuropeanCentralBank.java Source code

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Here is the source code for ymanv.forex.provider.impl.EuropeanCentralBank.java

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/**
 * Copyright (C) 2014 https://github.com/ymanv
 *
 * This software is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser 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 Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package ymanv.forex.provider.impl;

import static ymanv.forex.util.CurrencyUtils.USD;

import java.io.IOException;
import java.io.StringReader;
import java.math.BigDecimal;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;

import org.springframework.stereotype.Component;

import ymanv.forex.model.entity.rate.RateEntity;
import ymanv.forex.provider.AProvider;
import ymanv.forex.provider.impl.ecb.Day;
import ymanv.forex.provider.impl.ecb.Rate;
import ymanv.forex.provider.impl.ecb.Result;
import ymanv.forex.util.CurrencyUtils;

/**
 * European Central Bank daily update.
 * <p>
 * Update occurs at 15:00:00 Europe/Paris according to the <a href="http://www.ecb.europa.eu/stats/exchange/eurofxref/html/index.en.html" >ECB website</a>.
 * 
 */
@Component
public class EuropeanCentralBank extends AProvider {

    public static final String URL_DAILY = "http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml";
    public static final String URL_HIST = "http://www.ecb.europa.eu/stats/eurofxref/eurofxref-hist.xml";

    private static final TimeZone TZ = TimeZone.getTimeZone("Europe/Paris");
    private static final String BASE_CURRENCY = CurrencyUtils.EUR;

    @Override
    public List<RateEntity> getRates() throws IOException {
        return getRates(handler.sendGet(URL_DAILY), false);
    }

    private List<RateEntity> getRates(String response, boolean usdBase) throws IOException {
        SimpleDateFormat sf = new SimpleDateFormat(DATE_FORMAT_STRNG);
        Calendar sfCalendar = sf.getCalendar();
        sfCalendar.setTimeZone(TZ);

        List<RateEntity> rates = new ArrayList<>();

        String cleanResponse = response.substring(response.indexOf("<Cube>"), response.lastIndexOf("</Cube>") + 7);
        try {
            JAXBContext context = JAXBContext.newInstance(Result.class);
            Unmarshaller un = context.createUnmarshaller();
            Result res = (Result) un.unmarshal(new StringReader(cleanResponse));

            for (Day d : res.getDays()) {
                Date date = d.getDate();
                sf.parse(sf.format(date));
                sfCalendar.set(Calendar.HOUR, 15);
                date = sf.getCalendar().getTime();

                if (!usdBase) {
                    for (Rate r : d.getRates()) {
                        rates.add(new RateEntity(BASE_CURRENCY, r.getTocur(), new BigDecimal(r.getValue()), date));
                    }
                } else {
                    BigDecimal usdToEurValue = null;

                    for (Rate r : d.getRates()) {
                        if (USD.equals(r.getTocur())) {
                            usdToEurValue = invert(new BigDecimal(r.getValue()));
                            break;
                        }
                    }

                    for (Rate r : d.getRates()) {
                        if (USD.equals(r.getTocur())) {
                            rates.add(new RateEntity(USD, BASE_CURRENCY, usdToEurValue, date));
                        } else {
                            rates.add(new RateEntity(USD, r.getTocur(),
                                    new BigDecimal(r.getValue()).multiply(usdToEurValue), date));
                        }
                    }
                }
            }

            return rates;
        } catch (ParseException | JAXBException e) {
            throw new IOException(e);
        }
    }

    public List<RateEntity> getHistoricalRatesUSDBase() throws IOException {
        return getRates(handler.sendGet(URL_HIST), true);
    }
}