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DP44/enriched-partialglm/DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.TestModification/Model.md
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2026-04-17 14:55:32 -04:00

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source_files, generated_at, model, schema_version, sha256
source_files generated_at model schema_version sha256
DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.TestModification/Model/Enums.cs
DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.TestModification/Model/TestModificationModel.cs
DTS Viewer/DTS.Viewer.Modules/DTS.Viewer.TestModification/Model/TestModelManipulation.cs
2026-04-16T11:09:33.877186+00:00 zai-org/GLM-5-FP8 1 1e3214665d63bf12

Test Modification Module Documentation

1. Purpose

This module provides functionality for modifying test data within the DTS Viewer application. It manages the state of user-initiated modifications to channel parameters (sensitivity, EU multiplier/offset, T0 timing, line fit, software filters, data flags, and descriptions) and handles the persistence of these changes to both .dts metadata files and binary .chn channel files. The module supports backup/restore operations to allow reverting modifications and maintains change tracking to indicate which properties have been modified from their original values.

2. Public Interface

Enums.cs

Keys Enum

public enum Keys
{
    ApplyShiftT0ModsTestOnly // System Setting for whether to restrict "Shift T0" test modifications to "Test" only.
}
  • Defines a configuration key for controlling T0 modification behavior.

TestModificationModel.cs

TestModificationModel Class

Implements ITestModificationModel. A model class that tracks modification state for a selected test channel.

Calibration Properties:

Property Type Description
CalDate string Returns calibration date as short date string, or empty if Cal is null.
ModifyDate string Returns modify date/time string, or empty if Cal is null.
CalSensitivity double Gets/sets sensitivity from first calibration record. Returns double.NaN if unavailable.
ProportionalToExcitation bool Returns whether calibration is proportional to excitation.
ShowSensorCal bool Returns true if Cal and Sensor are non-null and calibration is not non-linear.
NonLinear bool Returns whether calibration is non-linear.
Cal ISensorCalDbRecord The latest calibration record for the channel.
Sensor ISensorDbRecord The sensor corresponding to the channel.

Channel Selection & Modification Tracking:

Property Type Description
SelectedChannel ITestChannel The currently selected test channel.
Description string Channel description string.
IsModifiedDescription bool True if Description differs from SelectedChannel.ChannelDescriptionString.
EuMultiplier double EU multiplier value.
IsModifiedEuMultiplier bool True if EuMultiplier differs from SelectedChannel.Multiplier.
EuOffset double EU offset value.
IsModifiedEuOffset bool True if EuOffset differs from SelectedChannel.UserOffsetEu.
T0 double T0 timing offset (in ms).
IsModifiedT0 bool True if T0 is not 0.
T1 double Line fit start point (in ms).
T2 double Line fit end point (in ms).
IsModifiedLineFit bool True if T1 or T2 is not 0.
Sensitivity double Sensitivity value.
IsModifiedSensitivity bool True if Sensitivity differs from SelectedChannel.Sensitivity.
SelectedFilter IFilterClass Selected software filter (defaults to FilterClassType.Unfiltered).
IsModifiedFilter bool True if SelectedFilter differs from channel's software filter.
SelectedDataFlag DataFlag Selected data flag.
IsModifiedDataFlag bool True if SelectedDataFlag differs from channel's data flag.
IsModified bool Aggregate flag indicating any modification exists and SelectedChannel is not null.

Control Enable/Disable Properties:

Property Type Default
EnableSensitivityControl bool true
EnableLineFitControl bool true
EnableEUOffsetControl bool true
EnableEUMultiplierControl bool true
EnableFilterControl bool true
EnableDescriptionControl bool true
IsDataFlagEnabled bool true
IsT0Enabled bool true

T0 Mode Properties:

Property Type Description
T0Mode T0Mode Gets/sets T0 mode (Test or DAS). When IsT0ModeTestOnly is true, setter forces value to T0Mode.Test.
IsT0ModeTestOnly bool When true, restricts T0 mode to Test only.

Other Properties:

Property Type Description
Parent ITestModificationViewModel Reference to parent view model.
IsSaved bool Property exists but has no implementation visible.

Methods:

public bool ValidateT0()
  • Validates that T0 falls within the dataset's time range (between start and end times).
  • Returns true if SelectedChannel or SelectedChannel.ParentModule is null.
  • Calculates valid range from StartRecordSampleNumber, TriggerSampleNumbers[0], NumberOfSamples, and SampleRateHz.
public void OnPropertyChanged(string propertyName)
  • Raises PropertyChanged event.
  • Updates IsModified aggregate flag when non-IsModified properties change.
  • Calls Parent?.PublishChanges().

Commands:

public DelegateCommand UpdateDatabaseCommand
  • Executes UpdateDatabaseMethod() which delegates to Parent.UpdateDatabaseMethod().

TestModelManipulation.cs

TestModelManipulation Class

Static utility class for file-based test modification operations.

Constants:

Constant Value Description
UNUSED_START_TIME 0 Placeholder for test serialization.
UNUSED_DATA_COLLECTION_LENGTH 0 Placeholder for test serialization.
BackupHeaderExtension ".header.bak" Extension for header-only backups.
BackupFileExtension ".bak" Extension for full file backups.

Public Methods:

public static void UndoAllModification(ITestModificationModel model)
  • Reverts all modifications by restoring .dts and all .chn files from backups.
  • Publishes ChannelsModificationNotification, RefreshTestRequestEvent, and TestModificationEvent.
public static bool BackupExists(ITestModificationModel model)
  • Returns true if either .dts.bak or .chn.bak files exist for the selected channel.
public static bool SaveModification(ITestModificationModel model, bool useISOCodeFilterMapping, bool bUseZeroForUnfiltered)
  • Persists all modifications to disk.
  • Handles T0 changes (applying to test or DAS based on T0Mode).
  • Handles filter changes with optional ISO code mapping.
  • Handles sensitivity, EU multiplier/offset, description, data flag, and line fit changes.
  • Publishes TestModificationEvent on completion.
public static bool SaveModificationDataFlag(ITestModificationModel model)
  • Saves only data flag modifications.
  • Publishes ChannelsModificationNotification and repopulates model from channel.
public static void ApplyLineFit(ITestModificationModel model, Test.Module.Channel channel)
  • Applies linear interpolation between sample indices derived from T1 and T2.
  • Backs up channel file (full backup, not header-only).
  • Modifies ADC data in place using straight-line fit between two points.
public static void PreviewLineFit(ITestModificationModel model)
  • Publishes ChannelsModificationLineFitNotification with calculated start/end indices for UI preview without disk modification.
public static void UndoModification(ITestModificationModel model)
  • Reverts in-memory changes by repopulating from channel.
  • Publishes ChannelsModificationNotification.
public static void PopulateFromChannel(ITestModificationModel model)
  • Initializes model properties from SelectedChannel values.
  • Resets T0, T1, T2 to 0.

3. Invariants

  1. Calibration Record Access: CalSensitivity getter assumes Cal.Records.Records[0] exists if the collection is non-null and non-empty. No bounds checking beyond length > 0.

  2. Modification Flag Consistency: IsModified is always false when SelectedChannel is null, regardless of other modification flags.

  3. T0Mode Restriction: When IsT0ModeTestOnly is true, the T0Mode setter always forces the value to T0Mode.Test, ignoring the provided value.

  4. Backup File Semantics: Backup files (.bak) represent the original unmodified files. If a backup exists, it is never overwritten by subsequent backup operations.

  5. Line Fit Index Ordering: ApplyLineFit automatically swaps start/end indices if startIndex > endIndex.

  6. T0 Validation Range: ValidateT0() calculates time range assuming TriggerSampleNumbers[0] exists (no bounds check on the list).

  7. Channel Matching: SaveModification matches channels by both ChannelId AND BinaryFileName suffix for most operations (except T0 modifications which apply more broadly).

4. Dependencies

Imports (This module depends on):

From TestModificationModel.cs:

  • DTS.Common - Common utilities
  • DTS.Common.Classes.Sensors - Sensor classes
  • DTS.Common.Enums.Sensors - Sensor enums
  • DTS.Common.Interface - Common interfaces
  • DTS.Common.Interface.Sensors - Sensor interfaces
  • DTS.Common.Interface.Sensors.SoftwareFilters - Filter interfaces
  • DTS.SensorDB - Sensor database interfaces (ISensorCalDbRecord, ISensorDbRecord)
  • Prism.Commands - DelegateCommand

From TestModelManipulation.cs:

  • DTS.Common - Common utilities
  • DTS.Common.Classes.Sensors - Sensor classes
  • DTS.Common.Events - Event types (TestModificationEvent, TestModificationArgs, ChannelsModificationNotification, ChannelsModificationLineFitNotification, LineFitArgs, RefreshTestRequestEvent)
  • DTS.Common.Interface - ITestChannel
  • DTS.Common.Settings - SettingsDB
  • DTS.Common.Utilities.Logging - APILogger
  • DTS.Serialization - Serialization utilities (Serialization.SliceRaw.File)
  • Prism.Ioc - ContainerLocator
  • Prism.Events - IEventAggregator

External Type References (Interfaces expected from elsewhere):

  • ITestModificationModel - Interface implemented by TestModificationModel
  • ITestModificationViewModel - Parent view model interface
  • ITestChannel - Test channel interface
  • ISensorCalDbRecord - Calibration database record
  • ISensorDbRecord - Sensor database record
  • IFilterClass / FilterClass - Software filter abstraction
  • T0Mode - Enum for T0 modification scope
  • DataFlag - Enum for data flags
  • Test.Module.Channel / Test.Module.AnalogInputChannel - Channel types from serialization
  • Test / TestSetup - Test structure types

5. Gotchas

  1. Namespace Mismatch: TestModificationModel.cs is declared in namespace DTS.Viewer.ChartOptions.Model despite residing in DTS.Viewer.TestModification/Model/. This may cause confusion when locating the class.

  2. IsSaved Property: The IsSaved property has a getter but no visible setter or backing field implementation. Its behavior is unclear from source alone.

  3. T0 Mode DAS Logic: In SaveModification, when T0Mode == T0Mode.DAS, T0 changes are applied to modules that do not contain the selected channel but share the same BaseSerialNumber as the module that does. This could affect more channels than expected.

  4. Line Fit Data Type: ApplyLineFit casts ADC data to short after floating-point interpolation, which could cause precision loss or overflow for extreme values.

  5. Thread.Sleep in File Writing: WriteDTSFileChanges includes System.Threading.Thread.Sleep(10) after writing the DTS file. The reason for this delay is not documented in source.

  6. Backup Strategy Selection: BackupChannelIfNeeded uses header-only backup for sensitivity/T0/filter changes (when useISOCodeFilterMapping is true), but full backup for line fit. This is a performance optimization but means different modification types have different restore behaviors.

  7. FilterClassType Default: SelectedFilter defaults to FilterClassType.Unfiltered, but the source does not show the definition of FilterClassType enum.

  8. PropertyChanged Event Naming: RebindCalProperties raises events with string property names rather than using nameof() operator, which could lead to runtime errors if property names change.

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