LogicalParser Class

public class LogicalParser : IAsyncDisposable, 
	IDisposable

Public Class LogicalParser
	Implements IAsyncDisposable, IDisposable

public ref class LogicalParser : IAsyncDisposable, 
	IDisposable

Gemstone.PQDIF.Logical.LogicalParser = function();

Type.createClass(
	'Gemstone.PQDIF.Logical.LogicalParser',
	null,
	IAsyncDisposable,
	IDisposable);

Inheritance

Object    LogicalParser

Implements

IAsyncDisposable, IDisposable

This class makes the data from PQD files readily available to applications and defines several redundant properties throughout the logical hierarchy of the PQDIF file to also facilitate the association of definitions with instances within the logical structure. The following list enumerates some of the more useful associations within the hierarchy.

• DataSource
• Settings
• ChannelDefinition
• Definition
• Definition

Usage consists of iterating through observations (ObservationRecord) to examine each of the the measurements recorded in the file. As was noted in the list above, the data source (DataSourceRecord) and settings for the monitor (MonitorSettingsRecord) associated with each observation is exposed as a property on the observation record. Note that the same data source and monitor settings records may be referenced by multiple observation records in the file.

The following example demonstrates how to read all observation records from a PQDIF file using the logical parser.

ContainerRecord containerRecord;
List<ObservationRecord> observationRecords = new List<ObservationRecord>();
string filePath = args[0];

await using LogicalParser parser = new LogicalParser(filePath);
await parser.OpenAsync();
containerRecord = parser.ContainerRecord;

while (await parser.HasNextObservationRecordAsync())
    observationRecords.Add(await parser.NextObservationRecordAsync());

Reference