org.springframework.analytics.metrics.AggregateCounterResolution.java Source code

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Here is the source code for org.springframework.analytics.metrics.AggregateCounterResolution.java

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/*
 * Copyright 2016 the original author or authors.
 *
 * 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.springframework.analytics.metrics;

import org.joda.time.DateTime;
import org.joda.time.Days;
import org.joda.time.Hours;
import org.joda.time.Minutes;
import org.joda.time.Months;
import org.joda.time.ReadablePeriod;
import org.joda.time.Years;

/**
 * The resolution options available for querying an aggregate counter.
 *
 * @author Luke Taylor
 */
public enum AggregateCounterResolution {
    minute(Minutes.minutes(1)), hour(Hours.hours(1)), day(Days.days(1)), month(Months.months(1)), year(
            Years.years(1));

    public final ReadablePeriod unitPeriod;

    private AggregateCounterResolution(ReadablePeriod unitPeriod) {
        this.unitPeriod = unitPeriod;
    }

    /**
     * Subtracts this resolution a given number of times from a supplied date.
     *
     * @param dt the date to subtract from
     * @param n the number of periods of this resolution to subtract
     * @return the resulting date in the past.
     */
    public DateTime minus(DateTime dt, int n) {
        DateTime start = dt;
        for (int i = 0; i < n; i++) {
            start = start.minus(unitPeriod);
        }
        return start;
    }
}