/// <summary>
/// Initializes a new instance of the <see cref="RestWebServiceMetadataProvider"/> class.
/// </summary>
public RestWebServiceMetadataProvider()
: base()
{
m_serviceUri = string.Empty;
m_serviceDataFormat = RestDataFormat.RestXml;
}
/// <summary>
/// Serializes <see cref="Metadata"/> to <see cref="SerializableMetadata"/> in the specified <paramref name="dataFormat"/>.
/// </summary>
/// <param name="outputStream"><see cref="Stream"/> where serialized <see cref="Metadata"/> is to be outputted.</param>
/// <param name="dataFormat"><see cref="RestDataFormat"/> in which the <see cref="Metadata"/> is to be serialized.</param>
/// <exception cref="ArgumentNullException"><paramref name="outputStream"/> is null.</exception>
/// <exception cref="NotSupportedException">Specified <paramref name="dataFormat"/> is not supported.</exception>
public void ExtractMetadata(ref Stream outputStream, RestDataFormat dataFormat)
{
if (outputStream == null)
throw new ArgumentNullException("outputStream");
// Serialize data to the provided stream.
if (dataFormat == RestDataFormat.AsmxXml)
{
// Serialize to ASMX XML data format.
XmlSerializer serializer = new XmlSerializer(typeof(SerializableMetadata));
serializer.Serialize(outputStream, new SerializableMetadata(m_metadata));
}
else if (dataFormat == RestDataFormat.RestXml)
{
// Serialize to REST XML data format.
DataContractSerializer serializer = new DataContractSerializer(typeof(SerializableMetadata));
serializer.WriteObject(outputStream, new SerializableMetadata(m_metadata));
}
else if (dataFormat == RestDataFormat.RestJson)
{
// Serialize to REST JSON data format.
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(SerializableMetadata));
serializer.WriteObject(outputStream, new SerializableMetadata(m_metadata));
}
else
{
// Data format is not supported.
throw new NotSupportedException(string.Format("{0} data format is not supported.", dataFormat));
}
}
/// <summary>
/// Loads saved <see cref="RestWebServiceMetadataProvider"/> settings from the config file if the <see cref="MetadataProviderBase.PersistSettings"/> property is set to true.
/// </summary>
public override void LoadSettings()
{
base.LoadSettings();
if (PersistSettings)
{
// Ensure that settings category is specified.
if (string.IsNullOrEmpty(SettingsCategory))
throw new InvalidOperationException("SettingsCategory property has not been set.");
// Load settings from the specified category.
ConfigurationFile config = ConfigurationFile.Current;
CategorizedSettingsElementCollection settings = config.Settings[SettingsCategory];
settings.Add("ServiceUri", m_serviceUri, "URI where the REST web service is hosted.");
settings.Add("ServiceDataFormat", m_serviceDataFormat, "Format (AsmxXml; RestXml; RestJson) in which the REST web service exposes the data.");
ServiceUri = settings["ServiceUri"].ValueAs(m_serviceUri);
ServiceDataFormat = settings["ServiceDataFormat"].ValueAs(m_serviceDataFormat);
}
}
/// <summary>
/// Updates the <see cref="Metadata"/> from <paramref name="streamData"/>
/// </summary>
/// <param name="streamData"><see cref="Stream"/> containing serialized <see cref="SerializableMetadata"/>.</param>
/// <param name="dataFormat"><see cref="RestDataFormat"/> in which the <see cref="SerializableMetadata"/> is serialized.</param>
/// <exception cref="ArgumentNullException"><paramref name="streamData"/> is null.</exception>
/// <exception cref="NotSupportedException">Specified <paramref name="dataFormat"/> is not supported.</exception>
public void UpdateMetadata(Stream streamData, RestDataFormat dataFormat)
{
if (streamData == null)
throw new ArgumentNullException("streamData");
// Deserialize serialized metadata.
SerializableMetadata deserializedMetadata = null;
if (dataFormat == RestDataFormat.AsmxXml)
{
// Data is in ASMX XML format.
XmlSerializer serializer = new XmlSerializer(typeof(SerializableMetadata));
deserializedMetadata = (SerializableMetadata)serializer.Deserialize(streamData);
}
else if (dataFormat == RestDataFormat.RestXml)
{
// Data is in REST XML format.
DataContractSerializer serializer = new DataContractSerializer(typeof(SerializableMetadata));
deserializedMetadata = (SerializableMetadata)serializer.ReadObject(streamData);
}
else if (dataFormat == RestDataFormat.RestJson)
{
// Data is in REST JSON format.
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(SerializableMetadata));
deserializedMetadata = (SerializableMetadata)serializer.ReadObject(streamData);
}
else
{
// Data format is not supported.
throw new NotSupportedException(string.Format("{0} data format is not supported.", dataFormat));
}
// Update metadata from the deserialized metadata.
foreach (SerializableMetadataRecord deserializedMetadataRecord in deserializedMetadata.MetadataRecords)
{
m_metadata.Write(deserializedMetadataRecord.HistorianID, deserializedMetadataRecord.Deflate());
}
}
