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With inspiration from other libraries

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/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.rolling;

import ch.qos.logback.core.rolling.helper.ArchiveRemover;
import ch.qos.logback.core.spi.ContextAware;

/**
 * This interface lists the set of methods that need to be implemented by
 * triggering policies which are nested within a {@link TimeBasedRollingPolicy}.
 * 
 * @author Ceki Gülcü
 * 
 * @param 
 */
public interface TimeBasedFileNamingAndTriggeringPolicy extends TriggeringPolicy, ContextAware {

    /**
     * Set the host/parent {@link TimeBasedRollingPolicy}.
     * 
     * @param tbrp
     *                parent TimeBasedRollingPolicy
     */
    void setTimeBasedRollingPolicy(TimeBasedRollingPolicy tbrp);

    /**
     * Return the file name for the elapsed periods file name.
     * 
     * @return
     */
    String getElapsedPeriodsFileName();

    /**
     * Return the current periods file name without the compression suffix. This
     * value is equivalent to the active file name.
     * 
     * @return current period's file name (without compression suffix)
     */
    String getCurrentPeriodsFileNameWithoutCompressionSuffix();

    /**
     * Return the archive remover appropriate for this instance.
     */
    ArchiveRemover getArchiveRemover();

    /**
     * Return the current time which is usually the value returned by
     * System.currentMillis(). However, for testing purposed this value
     * may be different than the real time.
     * 
     * @return current time value
     */
    long getCurrentTime();

    /**
     * Set the current time. Only unit tests should invoke this method.
     * 
     * @param now
     */
    void setCurrentTime(long now);

    /**
     * Set some date in the current period. Only unit tests should invoke this
     * method.
     * 
     * WARNING: method removed. A unit test should not set the
     * date in current period. It is the job of the FNATP to compute that.
     * 
     * @param date
     */
    // void setDateInCurrentPeriod(Date date);
}