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Ehcache is an open source, standards-based cache used to boost performance, offload the database and simplify scalability. Ehcache is robust, proven and full-featured and this has made it the most widely-used Java-based cache.

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/**
 *  Copyright Terracotta, 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 net.sf.ehcache.util;

/**
 * Utilities for converting times
 * @author Greg Luck
 */
public class TimeUtil {

    /**
     * Constant that contains the amount of milliseconds in a second
     */
    static final long ONE_SECOND = 1000L;

    /**
     * Converts milliseconds to seconds
     * @param timeInMillis
     * @return The equivalent time in seconds
     */
    public static int toSecs(long timeInMillis) {
        // Rounding the result to the ceiling, otherwise a
        // System.currentTimeInMillis that happens right before a new Element
        // instantiation will be seen as 'later' than the actual creation time
        return (int)Math.ceil((double)timeInMillis / ONE_SECOND);
    }

    /**
     * Converts seconds to milliseconds, with a precision of 1 second
     * @param timeInSecs the time in seconds
     * @return The equivalent time in milliseconds
     */
    public static long toMillis(int timeInSecs) {
        return timeInSecs * ONE_SECOND;
    }

    /**
     * Converts a long seconds value to an int seconds value and takes into account overflow
     * from the downcast by switching to Integer.MAX_VALUE.
     * @param seconds Long value
     * @return Same int value unless long > Integer.MAX_VALUE in which case MAX_VALUE is returned
     */
    public static int convertTimeToInt(long seconds) {
        if (seconds > Integer.MAX_VALUE) {
            return Integer.MAX_VALUE;
        } else {
            return (int) seconds;
        }
    }
}