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.
/**
 * 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 static ch.qos.logback.core.CoreConstants.CODES_URL;

import java.io.File;
import java.util.Date;
import java.util.Locale;

import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.rolling.helper.ArchiveRemover;
import ch.qos.logback.core.rolling.helper.DateTokenConverter;
import ch.qos.logback.core.rolling.helper.RollingCalendar;
import ch.qos.logback.core.spi.ContextAwareBase;

abstract public class TimeBasedFileNamingAndTriggeringPolicyBase<E> extends ContextAwareBase implements TimeBasedFileNamingAndTriggeringPolicy<E> {

    static private String COLLIDING_DATE_FORMAT_URL = CODES_URL + "#rfa_collision_in_dateFormat";

    protected TimeBasedRollingPolicy<E> tbrp;

    protected ArchiveRemover archiveRemover = null;
    protected String elapsedPeriodsFileName;
    protected RollingCalendar rc;

    protected long artificialCurrentTime = -1;
    protected Date dateInCurrentPeriod = null;

    protected long nextCheck;
    protected boolean started = false;
    protected boolean errorFree = true;

    public boolean isStarted() {
        return started;
    }

    public void start() {
        DateTokenConverter<Object> dtc = tbrp.fileNamePattern.getPrimaryDateTokenConverter();
        if (dtc == null) {
            throw new IllegalStateException("FileNamePattern [" + tbrp.fileNamePattern.getPattern() + "] does not contain a valid DateToken");
        }

        if (dtc.getTimeZone() != null) {
            rc = new RollingCalendar(dtc.getDatePattern(), dtc.getTimeZone(), Locale.getDefault());
        } else {
            rc = new RollingCalendar(dtc.getDatePattern());
        }
        addInfo("The date pattern is '" + dtc.getDatePattern() + "' from file name pattern '" + tbrp.fileNamePattern.getPattern() + "'.");
        rc.printPeriodicity(this);

        if (!rc.isCollisionFree()) {
            addError("The date format in FileNamePattern will result in collisions in the names of archived log files.");
            addError(CoreConstants.MORE_INFO_PREFIX + COLLIDING_DATE_FORMAT_URL);
            withErrors();
            return;
        }

        setDateInCurrentPeriod(new Date(getCurrentTime()));
        if (tbrp.getParentsRawFileProperty() != null) {
            File currentFile = new File(tbrp.getParentsRawFileProperty());
            if (currentFile.exists() && currentFile.canRead()) {
                setDateInCurrentPeriod(new Date(currentFile.lastModified()));
            }
        }
        addInfo("Setting initial period to " + dateInCurrentPeriod);
        computeNextCheck();
    }

    public void stop() {
        started = false;
    }

    protected void computeNextCheck() {
        nextCheck = rc.getNextTriggeringDate(dateInCurrentPeriod).getTime();
    }

    protected void setDateInCurrentPeriod(long now) {
        dateInCurrentPeriod.setTime(now);
    }

    // allow Test classes to act on the dateInCurrentPeriod field to simulate old
    // log files needing rollover
    public void setDateInCurrentPeriod(Date _dateInCurrentPeriod) {
        this.dateInCurrentPeriod = _dateInCurrentPeriod;
    }

    public String getElapsedPeriodsFileName() {
        return elapsedPeriodsFileName;
    }

    public String getCurrentPeriodsFileNameWithoutCompressionSuffix() {
        return tbrp.fileNamePatternWithoutCompSuffix.convert(dateInCurrentPeriod);
    }

    public void setCurrentTime(long timeInMillis) {
        artificialCurrentTime = timeInMillis;
    }

    public long getCurrentTime() {
        // if time is forced return the time set by user
        if (artificialCurrentTime >= 0) {
            return artificialCurrentTime;
        } else {
            return System.currentTimeMillis();
        }
    }

    public void setTimeBasedRollingPolicy(TimeBasedRollingPolicy<E> _tbrp) {
        this.tbrp = _tbrp;

    }

    public ArchiveRemover getArchiveRemover() {
        return archiveRemover;
    }

    protected void withErrors() {
        errorFree = false;
    }
    
    protected boolean isErrorFree() {
        return errorFree;
    }

}