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'databene commons' is an open source Java library by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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 org.databene.commons;

import java.util.*;

/**
 * Defines duration constants on millisecond base.
 * Created: 09.05.2007 19:22:27
 */
public class Period implements Comparable {

    private static SortedSet instances = new TreeSet();

    public static final Period MILLISECOND = new Period(1L, "ms");
    public static final Period SECOND = new Period(1000L, "s");
    public static final Period MINUTE = new Period(60 * 1000L, "m");
    public static final Period HOUR = new Period(60 * 60 * 1000L, "h");
    public static final Period DAY = new Period(24 * 60 * 60 * 1000L, "d");
    public static final Period WEEK = new Period(7 * 24 * 60 * 60 * 1000L, "w");
    public static final Period MONTH = new Period(30L * DAY.millis, "M");
    public static final Period QUARTER = new Period(3L * MONTH.millis, "M");
    public static final Period YEAR = new Period(365L * DAY.millis, "y");

    private long millis;
    private String name;

    private Period(long millis, String name) {
        this.millis = millis;
        this.name = name;
        instances.add(this);
    }

    public long getMillis() {
        return millis;
    }

    public String getName() {
        return name;
    }

    public static List getInstances() {
        return new ArrayList(instances);
    }

    // java.lang.Object overrides --------------------------------------------------------------------------------------

    @Override
    public String toString() {
        return name;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o)
            return true;
        if (o == null || getClass() != o.getClass())
            return false;
        return millis == ((Period) o).millis;
    }

    @Override
    public int hashCode() {
        return (int) (millis ^ (millis >>> 32));
    }

    // Comparable interface --------------------------------------------------------------------------------------------

    @Override
	public int compareTo(Period that) {
        if (this.millis > that.millis)
            return 1;
        else if (this.millis < that.millis)
            return -1;
        else
            return 0;
    }

    public static Period minInstance() {
        return instances.first();
    }

    public static Period maxInstance() {
        return instances.last();
    }
    
}