气象相关，转换风力，风向的工具类

import java.util.LinkedHashMap;
import java.util.Map;

/**
 * 气象工具
 */
public class WeatherUtil {

    // 风力
    private static final Map<String, Range> WIND_POWER = new LinkedHashMap<String, Range>() {
        {
            put("无风", new Range(0.0, 0.2));
            put("软风", new Range(0.3, 1.5));
            put("轻风", new Range(1.6, 3.3));
            put("微风", new Range(3.4, 5.4));
            put("和风", new Range(5.5, 7.9));
            put("劲风", new Range(8.0, 10.7));
            put("强风", new Range(10.8, 13.8));
            put("疾风", new Range(13.9, 17.1));
            put("大风", new Range(17.2, 20.7));
            put("烈风", new Range(20.8, 24.4));
            put("狂风", new Range(24.5, 28.4));
            put("暴风", new Range(28.5, 32.6));
            put("飓风", new Range(32.7, 100));
        }
    };

    // 风力等级
    private static final Map<String, String> WIND_POWER_LEVEL = new LinkedHashMap<String, String>() {
        {
            put("无风", "零级");
            put("软风", "一级");
            put("轻风", "二级");
            put("微风", "三级");
            put("和风", "四级");
            put("劲风", "五级");
            put("强风", "六级");
            put("疾风", "七级");
            put("大风", "八级");
            put("烈风", "九级");
            put("狂风", "十级");
            put("暴风", "十一级");
            put("飓风", "十二级");
        }
    };

    // 风向
    private static final Map<String, Range> WIND_DIRECTION = new LinkedHashMap<String, Range>() {
        {
            put("北", new Range(348.76, 11.25));
            put("东北偏北", new Range(11.26, 33.75));
            put("东北", new Range(33.76, 56.25));
            put("东北偏东", new Range(56.26, 78.75));
            put("东", new Range(78.76, 101.25));
            put("东南偏东", new Range(101.26, 123.75));
            put("东南", new Range(123.76, 146.25));
            put("东南偏南", new Range(146.26, 168.75));
            put("南", new Range(168.76, 191.25));
            put("西南偏南", new Range(191.26, 213.75));
            put("西南", new Range(213.76, 236.25));
            put("西南偏西", new Range(236.26, 258.75));
            put("西", new Range(258.76, 281.25));
            put("西北偏西", new Range(281.26, 303.75));
            put("西北", new Range(303.76, 326.25));
            put("西北偏北", new Range(326.26, 348.75));
        }
    };

    /**
     * 查找风力
     * @param windSpeed
     * @return
     */
    public static String findWindPower(Double windSpeed) {
        String windPower = "";
        if (windSpeed == null)
            return windPower;

        for (Map.Entry<String, Range> power : WIND_POWER.entrySet()) {
            String key = power.getKey();
            Range range = power.getValue();
            Double upper = range.getUpper();

            // windSpeed <= upper
            if (windSpeed.compareTo(upper) <= 0) {
                windPower = key;
                break;
            }
        }

        return windPower;
    }

    /**
     * 查找风向
     * @param value
     * @return
     */
    public static String findWindDirection(Double value) {
        String windDirection = "";
        if (value == null)
            return windDirection;

        for (Map.Entry<String, Range> direction : WIND_DIRECTION.entrySet()) {
            String key = direction.getKey();
            Range range = direction.getValue();
            Double lower = range.getLower();
            Double upper = range.getUpper();

            // lower <= value && upper <= value
            if (lower.compareTo(value) <= 0 && upper.compareTo(value) <= 0) {
                windDirection = key;
                break;
            }

            // lower <= value || value <= upper
            if (lower.compareTo(value) <= 0 || value.compareTo(upper) <= 0) {
                windDirection = key;
                break;
            }
        }

        return windDirection;
    }

    private static class Range {
        public double lower, upper;

        public Range(double lower, double upper) {
            this.lower = lower;
            this.upper = upper;
        }

        public double getLower() {
            return lower;
        }

        public void setLower(double lower) {
            this.lower = lower;
        }

        public double getUpper() {
            return upper;
        }

        public void setUpper(double upper) {
            this.upper = upper;
        }
    }
}