/// <summary>
/// Initializes a new instance of the <see cref="JsonStoreReader"/> class.
/// </summary>
/// <param name="name">The name of the application that generated the persisted files, or the root name of the files</param>
/// <param name="path">The directory in which the main persisted file resides or will reside, or null to create a volatile data store</param>
/// <param name="dataSchemaString">JSON schema used to validate data stream.</param>
/// <param name="extension">The extension for the underlying file.</param>
/// <param name="preloadSchemas">Dictionary of URis to JSON schemas to preload before validating any JSON. Would likely include schemas references by the catalog and data schemas.</param>
public JsonStoreReader(string name, string path, string dataSchemaString, string extension = DefaultExtension, IDictionary <Uri, string> preloadSchemas = null)
: base(dataSchemaString, extension, preloadSchemas)
{
this.Name = name;
this.Path = StoreCommon.GetPathToLatestVersion(name, path);
// load catalog
string metadataPath = System.IO.Path.Combine(this.Path, StoreCommon.GetCatalogFileName(this.Name) + this.Extension);
using (var file = File.OpenText(metadataPath))
using (var reader = new JsonTextReader(file))
using (var validatingReader = new JSchemaValidatingReader(reader))
{
validatingReader.Schema = this.CatalogSchema;
validatingReader.ValidationEventHandler += (s, e) => throw new InvalidDataException(e.Message);
this.catalog = this.Serializer.Deserialize <List <JsonStreamMetadata> >(validatingReader);
}
// compute originating time interval
this.originatingTimeInterval = TimeInterval.Empty;
foreach (var metadata in this.catalog)
{
var metadataTimeInterval = new TimeInterval(metadata.FirstMessageOriginatingTime, metadata.LastMessageOriginatingTime);
this.originatingTimeInterval = TimeInterval.Coverage(new TimeInterval[] { this.originatingTimeInterval, metadataTimeInterval });
}
}
private void WriteCatalog()
{
string metadataPath = System.IO.Path.Combine(this.Path, StoreCommon.GetCatalogFileName(this.Name) + this.Extension);
using (var file = File.CreateText(metadataPath))
using (var writer = new JsonTextWriter(file))
{
this.Serializer.Serialize(writer, this.catalog.Values.ToList());
}
}
private void WriteCatalog()
{
string metadataPath = System.IO.Path.Combine(this.Path, StoreCommon.GetCatalogFileName(this.Name) + this.Extension);
using (var file = File.CreateText(metadataPath))
using (var writer = new JsonTextWriter(file))
using (var validatingWriter = new JSchemaValidatingWriter(writer))
{
validatingWriter.Schema = this.CatalogSchema;
validatingWriter.ValidationEventHandler += (s, e) => throw new InvalidDataException(e.Message);
this.Serializer.Serialize(validatingWriter, this.catalog.Values.ToList());
}
}
/// <summary>
/// Initializes a new instance of the <see cref="JsonStoreReader"/> class.
/// </summary>
/// <param name="name">The name of the application that generated the persisted files, or the root name of the files.</param>
/// <param name="path">The directory in which the main persisted file resides or will reside, or null to create a volatile data store.</param>
/// <param name="extension">The extension for the underlying file.</param>
public JsonStoreReader(string name, string path, string extension = DefaultExtension)
: base(extension)
{
this.Name = name;
this.Path = StoreCommon.GetPathToLatestVersion(name, path);
// load catalog
string metadataPath = System.IO.Path.Combine(this.Path, StoreCommon.GetCatalogFileName(this.Name) + this.Extension);
using (var file = File.OpenText(metadataPath))
using (var reader = new JsonTextReader(file))
{
this.catalog = this.Serializer.Deserialize <List <JsonStreamMetadata> >(reader);
}
// compute originating time interval
this.originatingTimeInterval = TimeInterval.Empty;
foreach (var metadata in this.catalog)
{
var metadataTimeInterval = new TimeInterval(metadata.FirstMessageOriginatingTime, metadata.LastMessageOriginatingTime);
this.originatingTimeInterval = TimeInterval.Coverage(new TimeInterval[] { this.originatingTimeInterval, metadataTimeInterval });
}
}
/// <summary>
/// Indicates whether the specified store file exists.
/// </summary>
/// <param name="name">The name of the store to check.</param>
/// <param name="path">The path of the store to check.</param>
/// <returns>Returns true if the store exists.</returns>
public static bool Exists(string name, string path)
{
return((path == null) ? InfiniteFileReader.IsActive(StoreCommon.GetCatalogFileName(name), path) : StoreCommon.TryGetPathToLatestVersion(name, path, out _));
}
