/// <summary>
/// Tries to obtain the device ID (database key) for the device of the given name.
/// </summary>
/// <param name="context">The device database context to extend.</param>
/// <param name="deviceName">The device name to search for.</param>
/// <param name="deviceId">Returns the database key, if the device of given name has been found.</param>
/// <returns><c>true</c> if a device of the given name has been found and the ID returned. Otherwise <c>false</c>.</returns>
public static bool TryFindDeviceId(this DeviceDatabaseContext context, string deviceName, out int deviceId)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context), "The context to search device ID on is null");
}
if (String.IsNullOrWhiteSpace(deviceName))
{
throw new ArgumentNullException(nameof(deviceName), "The device name to search device ID for is null, empty or white-space-only");
}
deviceId = -1;
Device result = context.Devices.FirstOrDefault(d => d.Name == deviceName);
if (result == null)
{
return(false);
}
deviceId = result.Id;
return(true);
}
/// <summary>
/// Verifies the consistency of the database and the model (as we currently do NOT create the DB from the model).<br/>
/// Mainly checks whether there are DB entried for each enum and vice versa.
/// </summary>
/// <param name="context">The device database context to extend.</param>
/// <returns><c>true</c> if the model is consistend. Otherwise <c>false</c>. Details can be found as warning in log file.</returns>
public static bool FullConsistencyCheck(this DeviceDatabaseContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context), "The context to run consistency check on is null");
}
return(context.DataTypeConsistencyCheck() &&
context.RetrievableValueConsistencyCheck());
}
/// <summary>
/// Tries to obtain the oid lookup table given lookup ID.
/// </summary>
/// <param name="context">The device database context to extend.</param>
/// <param name="oidLookupId">The OID mapping lookup ID to get.</param>
/// <param name="maximumSupportedSnmpVersion">The maximum supported SNMP version (to put into returned lookup)</param>
/// <param name="oidLookup">Returns the OID lookup, if found.</param>
/// <returns><c>true</c> if a lookup of the given lookup ID has been found and the ID returned. Otherwise <c>false</c>.</returns>
public static bool TryFindDeviceSpecificOidLookup(this DeviceDatabaseContext context, int oidLookupId, SnmpVersion maximumSupportedSnmpVersion, out IDeviceSpecificOidLookup oidLookup)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context), "The context to search OID lookup is null");
}
oidLookup = null;
var result = context.DeviceSpecificOids.Where(d => d.OidMappingId == oidLookupId);
if (!result.Any())
{
return(false);
}
oidLookup = new DeviceSpecificOidLookup(result, maximumSupportedSnmpVersion);
return(true);
}
/// <summary>
/// Tries to obtain the OID lookup ID (database key) for the device version ID.
/// </summary>
/// <param name="context">The device database context to extend.</param>
/// <param name="deviceVersionId">The device version ID to look up the mapping ID for.</param>
/// <param name="oidMappingIds">Returns the comma-separated list of mapping IDs in order of precendence (first ID tried first).</param>
/// <returns><c>true</c> if a lookup of the given ID has been found and returned. Otherwise <c>false</c>.</returns>
public static bool TryFindOidLookupId(this DeviceDatabaseContext context, int deviceVersionId, out string oidMappingIds)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context), "The context to search OID lookup ID on is null");
}
oidMappingIds = string.Empty;
var result = context.DeviceVersionMapping.FirstOrDefault(d => d.DeviceVersionId == deviceVersionId);
if (result == null)
{
return(false);
}
oidMappingIds = result.OidMappingIds;
return(true);
}
/// <summary>
/// Tries to obtain the device version ID (database key) for the given device version (or the highest available version if null).
/// </summary>
/// <param name="context">The device database context to extend.</param>
/// <param name="deviceId">The device ID to search versions for.</param>
/// <param name="version">The version number to return the device version ID for. If null, the ID for the highest available version will be retrieved.</param>
/// <param name="deviceVersion">Returns the device version object if a device version of for given device ID and version range has been found.</param>
/// <returns><c>true</c> if a device version of the given version has been found and the ID returned. Otherwise <c>false</c>.</returns>
public static bool TryFindDeviceVersionId(this DeviceDatabaseContext context, int deviceId, SemanticVersion version, out DeviceVersion deviceVersion)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context), "The context to search device version ID on is null");
}
deviceVersion = null;
var result = context.DeviceVersions.Where(d => d.DeviceId == deviceId).OrderByDescending(d => d.HigherOrEqualVersion).ToList();
if (result.Count == 0)
{
// no such device ID at all
return(false);
}
if (version == null)
{
// no specific version requested, returns first entry (i.e. the one with the highest MinimumVersion)
deviceVersion = result[0];
return(true);
}
// need to search for the best match of specified version:
// we take the entry with the highest minimum version where the requested version is below maximum version
foreach (DeviceVersion item in result)
{
if ((item.HigherOrEqualVersion <= version) && ((item.LowerThanVersion == null) || (item.LowerThanVersion > version)))
{
deviceVersion = item;
return(true);
}
}
log.Debug($"TryFindDeviceVersionId: No version range for device ID {deviceId} in database is applicable to requested version '{version}'");
return(false);
}
/// <summary>
/// Verifies the consistency of the database and the model for DataType enum.<br/>
/// </summary>
/// <param name="context">The device database context to extend.</param>
/// <returns><c>true</c> if the model is consistend. Otherwise <c>false</c>. Details can be found as warning in log file.</returns>
public static bool RetrievableValueConsistencyCheck(this DeviceDatabaseContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context), "The context to run retrievable value consistency check on is null");
}
var retrievableValues = context.RetrievalValues.ToList();
bool returnValue = true;
// check if we have an enum for each database entry
foreach (RetrievableValue item in retrievableValues)
{
RetrievableValuesEnum parsedEnum;
bool parseSuccessful = Enum.TryParse <RetrievableValuesEnum>(item.ValueMeaning, out parsedEnum);
if (!parseSuccessful)
{
returnValue = false;
log.Error($"Database entry for value meaning name '{item.ValueMeaning}' cannot be found in C# enum {typeof(RetrievableValuesEnum).FullName}");
}
bool isDefined = Enum.IsDefined(typeof(RetrievableValuesEnum), item.Id);
if (!isDefined)
{
returnValue = false;
log.Error($"Database entry value meaning ID '{item.Id}' doesn't have a correponding C# enum value in {typeof(RetrievableValuesEnum).FullName}");
}
if (parseSuccessful && isDefined && ((int)parsedEnum != item.Id))
{
// Note: It doesn't make sense to do this check if we anyway found NO ENUM AT ALL which matches the ValueMeaning from database
// or if we didn't find any with the given integer value:
// It would just produce redundant error output (it must fail)
returnValue = false;
log.Error($"Database entry for value meaning ID '{item.Id}' of MeaningName '{item.ValueMeaning}' doesn't match C# enum of {typeof(RetrievableValuesEnum).FullName} with same integer value. Enum name instead is '{parsedEnum}'");
}
}
// check if we have a database entry for every enum value
foreach (RetrievableValuesEnum item in Enum.GetValues(typeof(RetrievableValuesEnum)))
{
RetrievableValue idMatchingDataType = retrievableValues.FirstOrDefault(dt => dt.Id == (int)item);
if (idMatchingDataType == null)
{
returnValue = false;
log.Error($"C# enum value '{item}' of {typeof(RetrievableValuesEnum).FullName} does NOT have a matching database entry with same numeric ID of {(int)item}");
}
RetrievableValue nameMatchingDataType = retrievableValues.FirstOrDefault(dt => dt.ValueMeaning.Equals(item.ToString()));
if (nameMatchingDataType == null)
{
returnValue = false;
log.Error($"C# enum value '{item}' of {typeof(RetrievableValuesEnum).FullName} does NOT have a matching database entry with same name");
}
if ((idMatchingDataType != null) && (nameMatchingDataType != null) && (idMatchingDataType != nameMatchingDataType))
{
// Note: It doesn't make sense to do this check if we anyway found NO DB ENTRY AT ALL which matches the TypeName from enum
// or if we didn't find any with the given integer value:
// It would just produce redundant error output (it must fail)
returnValue = false;
log.Error($"C# enum value '{item}' of {typeof(RetrievableValuesEnum).FullName} does NOT have consistent matching database entries. Database entry of same name is '{nameMatchingDataType}' while entry of same ID is '{idMatchingDataType}'");
}
}
return(returnValue);
}
