at.orz.arangodb.util.DateUtils.java Source code

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Here is the source code for at.orz.arangodb.util.DateUtils.java

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/*
 * Copyright (C) 2012 tamtam180
 *
 * Licensed 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 at.orz.arangodb.util;

import java.io.Serializable;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.TimeZone;

import com.google.gson.JsonParseException;

/**
 * @author tamtam180 - kirscheless at gmail.com
 *
 */
public class DateUtils {

    static class TripleKey<T, U, V> implements Serializable {
        private static final long serialVersionUID = 2612228100559578823L;
        private T first;
        private U second;
        private V third;

        public TripleKey() {
        }

        public TripleKey(T first, U second, V third) {
            this.first = first;
            this.second = second;
            this.third = third;
        }

        public T getFirst() {
            return first;
        }

        public void setFirst(T first) {
            this.first = first;
        }

        public U getSecond() {
            return second;
        }

        public void setSecond(U second) {
            this.second = second;
        }

        public V getThird() {
            return third;
        }

        public void setThird(V third) {
            this.third = third;
        }

        @Override
        public int hashCode() {
            final int prime = 31;
            int result = 1;
            result = prime * result + ((first == null) ? 0 : first.hashCode());
            result = prime * result + ((second == null) ? 0 : second.hashCode());
            result = prime * result + ((third == null) ? 0 : third.hashCode());
            return result;
        }

        @Override
        public boolean equals(Object obj) {
            if (this == obj)
                return true;
            if (obj == null)
                return false;
            if (getClass() != obj.getClass())
                return false;
            TripleKey<?, ?, ?> other = (TripleKey<?, ?, ?>) obj;
            if (first == null) {
                if (other.first != null)
                    return false;
            } else if (!first.equals(other.first))
                return false;
            if (second == null) {
                if (other.second != null)
                    return false;
            } else if (!second.equals(other.second))
                return false;
            if (third == null) {
                if (other.third != null)
                    return false;
            } else if (!third.equals(other.third))
                return false;
            return true;
        }
    }

    private static class LocalFormat {
        private HashMap<TripleKey<String, Locale, TimeZone>, SimpleDateFormat> sdfMap = new HashMap<DateUtils.TripleKey<String, Locale, TimeZone>, SimpleDateFormat>();

        public SimpleDateFormat getDateFormat(String format, Locale locale, TimeZone timeZone) {
            TripleKey<String, Locale, TimeZone> key = new TripleKey<String, Locale, TimeZone>(format, locale,
                    timeZone);
            SimpleDateFormat sdf = sdfMap.get(key);
            if (sdf == null) {
                sdf = new SimpleDateFormat(format);
                sdf.setTimeZone(timeZone);
                sdfMap.put(key, sdf);
            }
            return sdf;
        }

    }

    private static ThreadLocal<LocalFormat> dateFormats = new ThreadLocal<LocalFormat>() {
        @Override
        protected LocalFormat initialValue() {
            return new LocalFormat();
        }
    };

    private static TimeZone utcTimeZone = TimeZone.getTimeZone("UTC");

    public static Date parse(String text, String format) throws ParseException {

        SimpleDateFormat dateFormat = dateFormats.get().getDateFormat(format, Locale.US, utcTimeZone);
        Date date = dateFormat.parse(text);
        return date;

    }

    /**
     * Parse date-string in "yyyy-MM-dd'T'HH:mm:ss'Z'" format.
     * @param dateString
     * @return
     */
    public static Date parse(String dateString) {

        try {
            return DateUtils.parse(dateString, "yyyy-MM-dd'T'HH:mm:ss'Z'");
        } catch (ParseException e) {
            throw new JsonParseException("time format invalid:" + dateString);
        }

    }

    public static String format(Date date, String format) {

        SimpleDateFormat dateFormat = dateFormats.get().getDateFormat(format, Locale.US, TimeZone.getDefault());
        String text = dateFormat.format(date);
        return text;

    }

}