CellTowerDatabase.java 文件源码

/**
 * Internal db query to retrieve all cell tower candidates for a given cid/lac.
 * @param mcc
 * @param mnc
 * @param cid
 * @param lac
 * @return
 */
private List<CellInfo> _query(Integer mcc, Integer mnc, int cid, int lac) {
    if (this.reader == null) return null;

    // we need at least CID/LAC
    if (cid == NeighboringCellInfo.UNKNOWN_CID) return null;

    android.util.Log.d("LNLP/Query", "(" + mcc + "," + mnc + "," + cid + "," + lac + ")");

    List<CellInfo> cil = _queryDirect(mcc, mnc, cid, lac);
    if (cil == null || cil.size() == 0) {
        if (cid > 0xffff) {
            _queryDirect(mcc, mnc, cid & 0xffff, lac);
        }
    }
    if (cil != null && cil.size() > 0) {
        return cil;
    }

    if (mcc != null && mnc != null) {
        return query(mcc, null, cid, lac);
    }

    if (mcc != null || mnc != null) {
        return query(null,null,cid,lac);
    }

    return null;
}