com.lithium.flow.util.TimeUtils Maven / Gradle / Ivy

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/*
 * Copyright 2015 Lithium Technologies, Inc.
 *
 * 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 com.lithium.flow.util;

import static com.google.common.base.Preconditions.checkNotNull;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.TimeZone;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * @author Matt Ayres
 */
public class TimeUtils {
	public static long getMillisValue(@Nullable String value) {
		if (value == null) {
			throw new NumberFormatException("value is null");
		}
		if (value.length() == 0) {
			throw new NumberFormatException("value is empty");
		}

		char c = value.charAt(value.length() - 1);
		if (Character.isLetter(c) && value.length() > 1) {
			long millis = Long.parseLong(value.substring(0, value.length() - 1));
			switch (c) {
				case 'y':
					return millis * 1000 * 60 * 60 * 24 * 365;
				case 'M':
					return millis * 1000 * 60 * 60 * 24 * 30;
				case 'w':
					return millis * 1000 * 60 * 60 * 24 * 7;
				case 'd':
					return millis * 1000 * 60 * 60 * 24;
				case 'h':
					return millis * 1000 * 60 * 60;
				case 'm':
					return millis * 1000 * 60;
				case 's':
					return millis * 1000;
				default:
					return millis;
			}
		} else {
			return Long.parseLong(value);
		}
	}

	public static long getTime(@Nonnull String format, @Nonnull String date, @Nonnull String tz) {
		checkNotNull(format);
		checkNotNull(date);
		checkNotNull(tz);
		try {
			DateFormat dateFormat = new SimpleDateFormat(format);
			dateFormat.setTimeZone(TimeZone.getTimeZone(tz));
			return dateFormat.parse(date).getTime();
		} catch (ParseException e) {
			throw new RuntimeException(e);
		}
	}
}