/// <summary>
/// Creates a new instance of the <see cref="ContainerRecord"/> class.
/// </summary>
/// <param name="physicalRecord">The physical structure of the container record.</param>
private ContainerRecord(Record physicalRecord)
{
m_physicalRecord = physicalRecord;
}
/// <summary>
/// Writes the given record to the PQDIF file.
/// </summary>
/// <param name="record">The record to be written to the file.</param>
/// <param name="lastRecord">Indicates whether this record is the last record in the file.</param>
public void WriteRecord(Record record, bool lastRecord = false)
{
byte[] bodyImage;
if (m_disposed)
throw new ObjectDisposedException(GetType().Name);
using (BlockAllocatedMemoryStream bodyStream = new BlockAllocatedMemoryStream())
using (BinaryWriter bodyWriter = new BinaryWriter(bodyStream))
{
// Write the record body to the memory stream
WriteCollection(bodyWriter, record.Body.Collection);
// Read and compress the body to a byte array
bodyImage = bodyStream.ToArray();
if (m_compressionAlgorithm == CompressionAlgorithm.Zlib && m_compressionStyle == CompressionStyle.RecordLevel)
bodyImage = ZlibStream.CompressBuffer(bodyImage);
}
// Fix the pointer to the next
// record before writing this record
if (m_stream.CanSeek && m_stream.Length > 0)
{
m_writer.Write((int)m_stream.Length);
m_stream.Seek(0L, SeekOrigin.End);
}
// Make sure the header points to the correct location based on the size of the body
record.Header.HeaderSize = 64;
record.Header.BodySize = bodyImage.Length;
record.Header.NextRecordPosition = (int)m_stream.Length + record.Header.HeaderSize + record.Header.BodySize;
// Write up to the next record position
m_writer.Write(record.Header.RecordSignature.ToByteArray());
m_writer.Write(record.Header.RecordTypeTag.ToByteArray());
m_writer.Write(record.Header.HeaderSize);
m_writer.Write(record.Header.BodySize);
// The PQDIF standard defines the NextRecordPosition to be 0 for the last record in the file
// We treat seekable streams differently because we can go back and fix the pointers later
if (m_stream.CanSeek || lastRecord)
m_writer.Write(0);
else
m_writer.Write(record.Header.NextRecordPosition);
// Write the rest of the header as well as the body
m_writer.Write(record.Header.Checksum);
m_writer.Write(record.Header.Reserved);
m_writer.Write(bodyImage);
// If the stream is seekable, seek to the next record
// position so we can fix the pointer if we end up
// writing another record to the file
if (m_stream.CanSeek)
m_stream.Seek(-(24 + record.Header.BodySize), SeekOrigin.Current);
// Dispose of the writer if this is the last record
if (!m_stream.CanSeek && lastRecord)
Dispose();
}
/// <summary>
/// Creates a new instance of the <see cref="MonitorSettingsRecord"/> class.
/// </summary>
/// <param name="physicalRecord">The physical structure of the monitor settings record.</param>
private MonitorSettingsRecord(Record physicalRecord)
{
m_physicalRecord = physicalRecord;
}
// Static Methods
/// <summary>
/// Creates a new container record from the given physical record
/// if the physical record is of type container. Returns null if
/// it is not.
/// </summary>
/// <param name="physicalRecord">The physical record used to create the container record.</param>
/// <returns>The new container record, or null if the physical record does not define a container record.</returns>
public static ContainerRecord CreateContainerRecord(Record physicalRecord)
{
bool isValidPhysicalRecord = physicalRecord.Header.TypeOfRecord == RecordType.Container;
return (isValidPhysicalRecord) ? new ContainerRecord(physicalRecord) : null;
}
// Static Methods
/// <summary>
/// Creates a new monitor settings record from the given physical record
/// if the physical record is of type monitor settings. Returns null if
/// it is not.
/// </summary>
/// <param name="physicalRecord">The physical record used to create the monitor settings record.</param>
/// <returns>The new monitor settings record, or null if the physical record does not define a monitor settings record.</returns>
public static MonitorSettingsRecord CreateMonitorSettingsRecord(Record physicalRecord)
{
bool isValidMonitorSettingsRecord = physicalRecord.Header.TypeOfRecord == RecordType.MonitorSettings;
return isValidMonitorSettingsRecord ? new MonitorSettingsRecord(physicalRecord) : null;
}
/// <summary>
/// Creates a new instance of the <see cref="DataSourceRecord"/> class.
/// </summary>
/// <param name="physicalRecord">The physical structure of the data source record.</param>
private DataSourceRecord(Record physicalRecord)
{
m_physicalRecord = physicalRecord;
}
// Static Methods
/// <summary>
/// Creates a new data source record from the given physical record
/// if the physical record is of type data source. Returns null if
/// it is not.
/// </summary>
/// <param name="physicalRecord">The physical record used to create the data source record.</param>
/// <returns>The new data source record, or null if the physical record does not define a data source record.</returns>
public static DataSourceRecord CreateDataSourceRecord(Record physicalRecord)
{
bool isValidDataSourceRecord = physicalRecord.Header.TypeOfRecord == RecordType.DataSource;
return isValidDataSourceRecord ? new DataSourceRecord(physicalRecord) : null;
}
/// <summary>
/// Creates a new instance of the <see cref="ObservationRecord"/> class.
/// </summary>
/// <param name="physicalRecord">The physical structure of the observation record.</param>
/// <param name="dataSource">The data source record that defines the channels in this observation record.</param>
/// <param name="settings">The monitor settings to be applied to this observation record.</param>
private ObservationRecord(Record physicalRecord, DataSourceRecord dataSource, MonitorSettingsRecord settings)
{
m_physicalRecord = physicalRecord;
m_dataSource = dataSource;
m_settings = settings;
}
// Static Methods
/// <summary>
/// Creates a new observation record from the given physical record
/// if the physical record is of type observation. Returns null if
/// it is not.
/// </summary>
/// <param name="physicalRecord">The physical record used to create the observation record.</param>
/// <param name="dataSource">The data source record that defines the channels in this observation record.</param>
/// <param name="settings">The monitor settings to be applied to this observation record.</param>
/// <returns>The new observation record, or null if the physical record does not define a observation record.</returns>
public static ObservationRecord CreateObservationRecord(Record physicalRecord, DataSourceRecord dataSource, MonitorSettingsRecord settings)
{
bool isValidObservationRecord = physicalRecord.Header.TypeOfRecord == RecordType.Observation;
return isValidObservationRecord ? new ObservationRecord(physicalRecord, dataSource, settings) : null;
}
