com.hp.hpl.jena.sparql.util.Utils.java Source code

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Here is the source code for com.hp.hpl.jena.sparql.util.Utils.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hp.hpl.jena.sparql.util;

import java.math.BigDecimal;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;

import org.apache.commons.lang3.time.FastDateFormat;

import com.hp.hpl.jena.datatypes.xsd.XSDDateTime;

/** Miscellaneous operations - not query specific */

public class Utils {
    private static final FastDateFormat dateTimeFmt_display = FastDateFormat.getInstance("yyyy/MM/dd HH:mm:ss z");
    private static final FastDateFormat dateFmt_yyyymmdd = FastDateFormat.getInstance("yyyy-MM-dd");
    private static final FastDateFormat dateTimeFmt_XSD = FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss.SSS");
    private static final FastDateFormat timeFmt_hhmmssSS = FastDateFormat.getInstance("HH:mm:ss.SSS");

    static public String className(Object obj) {
        if (obj == null)
            return "null";
        return classShortName(obj.getClass());
    }

    static public String classShortName(Class<?> cls) {
        String tmp = cls.getName();
        int i = tmp.lastIndexOf('.');
        tmp = tmp.substring(i + 1);
        return tmp;
    }

    public static String nowAsXSDDateTimeString() {
        return calendarToXSDDateTimeString(new GregorianCalendar());
    }

    public static String todayAsXSDDateString() {
        return calendarToXSDDateString(new GregorianCalendar());
    }

    public static String XSDDateTime2String(XSDDateTime xdt) {
        return xdt.toString();
    }

    /** Return "now" as readable string (date in yyyy/MM/dd format) */
    public static String nowAsString() {
        return nowAsString(dateTimeFmt_display);
    }

    public static String nowAsString(String formatString) {
        FastDateFormat df = FastDateFormat.getInstance(formatString);
        return df.format(new Date());
    }

    public static String nowAsString(FastDateFormat dateFormat) {
        return dateFormat.format(new Date());
    }

    public static String calendarToXSDDateTimeString(Calendar cal) {
        return calendarToXSDString(cal, dateTimeFmt_XSD);
    }

    public static String calendarToXSDDateString(Calendar cal) {
        return calendarToXSDString(cal, dateFmt_yyyymmdd);
    }

    public static String calendarToXSDTimeString(Calendar cal) {
        return calendarToXSDString(cal, timeFmt_hhmmssSS);
    }

    private static String calendarToXSDString(Calendar cal, FastDateFormat fmt) {
        // c.f. Constructor on Jena's XSDDateTime
        // Only issue is that it looses the timezone through (Xerces)
        // normalizing to UTC.
        Date date = cal.getTime();
        String lex = fmt.format(date);
        lex = lex + calcTimezone(cal);
        return lex;
    }

    private static String calcTimezone(Calendar cal) {
        Date date = cal.getTime();
        TimeZone z = cal.getTimeZone();
        int tz = z.getRawOffset();

        if (z.inDaylightTime(date)) {
            int tzDst = z.getDSTSavings();
            tz = tz + tzDst;
        }

        String sign = "+";
        if (tz < 0) {
            sign = "-";
            tz = -tz;
        }

        int tzH = tz / (60 * 60 * 1000); // Integer divide towards zero.
        int tzM = (tz - tzH * 60 * 60 * 1000) / (60 * 1000);

        String tzH_str = Integer.toString(tzH);
        String tzM_str = Integer.toString(tzM);

        if (tzH < 10)
            tzH_str = "0" + tzH_str;
        if (tzM < 10)
            tzM_str = "0" + tzM_str;
        return sign + tzH_str + ":" + tzM_str;
    }

    static public String stringForm(BigDecimal decimal) {
        return decimal.toPlainString();
    }

    static public String stringForm(double d) {
        if (Double.isInfinite(d)) {
            if (d < 0)
                return "-INF";
            return "INF";
        }

        if (Double.isNaN(d))
            return "NaN";

        // Otherwise, SPARQL form always has "e0"
        String x = Double.toString(d);
        if ((x.indexOf('e') != -1) || (x.indexOf('E') != -1))
            return x;
        // Renormalize?
        return x + "e0";
    }

    static public String stringForm(float f) {
        // No SPARQL short form.
        return Float.toString(f);
    }
}