com.liferay.portlet.currencyconverter.util.CurrencyWebCacheItem.java Source code

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Here is the source code for com.liferay.portlet.currencyconverter.util.CurrencyWebCacheItem.java

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/**
 * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
 *
 * This library 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 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library 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.
 */

package com.liferay.portlet.currencyconverter.util;

import com.liferay.portal.kernel.util.GetterUtil;
import com.liferay.portal.kernel.util.HttpUtil;
import com.liferay.portal.kernel.util.StringPool;
import com.liferay.portal.kernel.util.Time;
import com.liferay.portal.kernel.webcache.WebCacheException;
import com.liferay.portal.kernel.webcache.WebCacheItem;
import com.liferay.portlet.currencyconverter.model.Currency;

import java.util.StringTokenizer;

/**
 * @author Brian Wing Shun Chan
 */
public class CurrencyWebCacheItem implements WebCacheItem {

    public CurrencyWebCacheItem(String symbol) {
        _symbol = symbol;
    }

    public Object convert(String key) throws WebCacheException {
        String symbol = _symbol;
        double rate = 0.0;

        try {
            if (symbol.length() == 6) {
                String fromSymbol = symbol.substring(0, 3);
                String toSymbol = symbol.substring(3, 6);

                if (!CurrencyUtil.isCurrency(fromSymbol) || !CurrencyUtil.isCurrency(toSymbol)) {

                    throw new WebCacheException(symbol);
                }
            } else if (symbol.length() == 3) {
                if (!CurrencyUtil.isCurrency(symbol)) {
                    throw new WebCacheException(symbol);
                }
            } else {
                throw new WebCacheException(symbol);
            }

            String text = HttpUtil
                    .URLtoString("http://finance.yahoo.com/d/quotes.csv?s=" + symbol + "=X&f=sl1d1t1c1ohgv&e=.csv");

            StringTokenizer st = new StringTokenizer(text, StringPool.COMMA);

            // Skip symbol

            st.nextToken();

            rate = GetterUtil.getDouble(st.nextToken().replace('"', ' ').trim());
        } catch (Exception e) {
            throw new WebCacheException(e);
        }

        return new Currency(symbol, rate);
    }

    public long getRefreshTime() {
        return _REFRESH_TIME;
    }

    private static final long _REFRESH_TIME = Time.MINUTE * 20;

    private String _symbol;

}