package com.onaro.sanscreen.client.view.changes;

import com.onaro.sanscreen.server.changes.*;
import com.onaro.sanscreen.types.*;

public class ChangesUtil {
    /**
     * Some of the elements described in a change may not exist in the SAN at the time of the change.
     * <p>e.g. a host in a host down change is already gone from the SAN.
     * In order to get information on the host, the query should be of 1 milli second before
     * This method returns the right query time according to the type of the change
     * @param change
     * @return the time of the change or 1 milli second before for changes that describes elements going down.
     */
    public static long getQueryTime(Change change) {
        ChangeType changeType = change.getType();
        long time = change.getTime();

        //if the change type belongs to these group, the device will not be in the SAN at the time of the change.
        //Therefor, in order to query the device, a time stamp of one milli second earlier is used.
        return ChangeType.DOWN_CHANGE_TYPES.contains(changeType) ? time - 1 : time;

    }
}