com.liferay.weather.util.WeatherWebCacheItem.java Source code

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Here is the source code for com.liferay.weather.util.WeatherWebCacheItem.java

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/**
 * Copyright (c) 2000-present 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.weather.util;

import com.liferay.portal.kernel.util.GetterUtil;
import com.liferay.portal.kernel.util.HttpUtil;
import com.liferay.portal.kernel.util.Time;
import com.liferay.portal.kernel.webcache.WebCacheException;
import com.liferay.portal.kernel.webcache.WebCacheItem;
import com.liferay.portal.kernel.xml.Attribute;
import com.liferay.portal.kernel.xml.Document;
import com.liferay.portal.kernel.xml.Element;
import com.liferay.portal.kernel.xml.SAXReaderUtil;
import com.liferay.weather.model.Weather;

/**
 * @author Brian Wing Shun Chan
 * @author Samuel Kong
 * @author Preston Crary
 */
public class WeatherWebCacheItem implements WebCacheItem {

    public WeatherWebCacheItem(String zip) {
        _zip = zip;

        if (_zip.equals("Frankfurt/Main")) {
            _zip = "Frankfurt, Germany";
        }
    }

    @Override
    public Object convert(String key) throws WebCacheException {
        Weather weather = null;

        try {
            weather = doConvert();
        } catch (Exception e) {
            throw new WebCacheException(_zip);
        }

        return weather;
    }

    @Override
    public long getRefreshTime() {
        return _REFRESH_TIME;
    }

    protected Weather doConvert() throws Exception {
        String xml = HttpUtil.URLtoString("http://api.openweathermap.org/data/2.5/weather?q="
                + HttpUtil.encodeURL(_zip) + "&units=imperial&mode=xml");

        Document document = SAXReaderUtil.read(xml);

        Element rootElement = document.getRootElement();

        Element cityElement = rootElement.element("city");

        Attribute cityIdAttribute = cityElement.attribute("id");

        String cityId = cityIdAttribute.getText();

        Element temperatureElement = rootElement.element("temperature");

        Attribute temperatureAttribute = temperatureElement.attribute("value");

        float temperature = GetterUtil.getFloat(temperatureAttribute.getData());

        Element weatherElement = rootElement.element("weather");

        Attribute iconAttribute = weatherElement.attribute("icon");

        String iconURL = "http://openweathermap.org/img/w/" + iconAttribute.getText() + ".png";

        return new Weather(_zip, cityId, iconURL, temperature);
    }

    private static final long _REFRESH_TIME = Time.MINUTE * 60;

    private String _zip;

}