UnitsFormat.java

 /*
  * RHQ Management Platform
  * Copyright (C) 2005-2008 Red Hat, Inc.
  * All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License, version 2, as
  * published by the Free Software Foundation, and/or the GNU Lesser
  * General Public License, version 2.1, also as published by the Free
  * Software Foundation.
  *
  * 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 General Public License and the GNU Lesser General Public License
  * for more details.
  *
  * You should have received a copy of the GNU General Public License
  * and the GNU Lesser General Public License along with this program;
  * if not, write to the Free Software Foundation, Inc.,
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
package org.rhq.core.clientapi.util.units;

import java.math.BigDecimal;
import java.util.HashMap;
import java.util.Locale;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class UnitsFormat {
    private static final HashMap<UnitsConstants, Object> formatters;

    static {
        formatters = new HashMap<UnitsConstants, Object>();

        formatters.put(UnitsConstants.UNIT_NONE, new NoFormatter());
        formatters.put(UnitsConstants.UNIT_BYTES, new BytesFormatter());
        formatters.put(UnitsConstants.UNIT_BITS, new BitRateFormatter());
        formatters.put(UnitsConstants.UNIT_DURATION, new DurationFormatter());
        formatters.put(UnitsConstants.UNIT_DATE, new DateFormatter());
        formatters.put(UnitsConstants.UNIT_PERCENTAGE, new PercentageFormatter());
        formatters.put(UnitsConstants.UNIT_TEMPERATURE, new TemperatureFormatter());

    }

    private static Log log = LogFactory.getLog(UnitsFormat.class);

    public static FormattedNumber format(UnitNumber val) {
        return format(val, Locale.getDefault());
    }

    public static FormattedNumber format(UnitNumber val, Locale locale) {
        return format(val, locale, null);
    }

    private static Formatter getFormatter(UnitsConstants unitType) {
        Formatter res;

        res = (Formatter) formatters.get(unitType);
        if (res == null) {
            throw new IllegalStateException("Unhandled unit type: " + unitType);
        }

        return res;
    }

    public static FormattedNumber format(UnitNumber val, Locale locale, FormatSpecifics specifics) {
        FormattedNumber res;
        Formatter formatter;

        formatter = getFormatter(val.getUnits());

        res = formatter.format(val, locale, specifics);
        if (log.isDebugEnabled()) {
            log.debug("format(" + val.getValue() + ") -> " + res);
        }

        return res;
    }

    static BigDecimal getBaseValue(double value, UnitsConstants unitType, ScaleConstants scale) {
        return getFormatter(unitType).getBaseValue(value, scale);
    }

    static BigDecimal getScaledValue(BigDecimal baseValue, UnitsConstants unitType, ScaleConstants scale) {
        return getFormatter(unitType).getScaledValue(baseValue, scale);
    }
}