/// <summary>
/// Internal Helper method which does the actual loading of the Graph from the Resource
/// </summary>
/// <param name="handler">RDF Handler to use</param>
/// <param name="asm">Assembly to get the resource stream from</param>
/// <param name="resource">Full name of the Resource (without the Assembly Name)</param>
/// <param name="parser">Parser to use (if null then will be auto-selected)</param>
private static void LoadGraphInternal(IRdfHandler handler, Assembly asm, String resource, IRdfReader parser)
{
//Resource is in the given assembly
using (Stream s = asm.GetManifestResourceStream(resource))
{
if (s == null)
{
//Resource did not exist in this assembly
throw new RdfParseException("The Embedded Resource '" + resource + "' does not exist inside of " + GetAssemblyName(asm));
}
else
{
//Resource exists
//Did we get a defined parser to use?
if (parser != null)
{
parser.Load(handler, new StreamReader(s));
}
else
{
//Need to select a Parser or use StringParser
String ext = MimeTypesHelper.GetTrueResourceExtension(resource);
MimeTypeDefinition def = MimeTypesHelper.GetDefinitionsByFileExtension(ext).FirstOrDefault(d => d.CanParseRdf);
if (def != null)
{
//Resource has an appropriate file extension and we've found a candidate parser for it
parser = def.GetRdfParser();
parser.Load(handler, new StreamReader(s));
}
else
{
//Resource did not have a file extension or we didn't have a parser associated with the extension
//Try using StringParser instead
String data;
using (StreamReader reader = new StreamReader(s))
{
data = reader.ReadToEnd();
#if !PORTABLE
reader.Close();
#endif
}
parser = StringParser.GetParser(data);
parser.Load(handler, new StringReader(data));
}
}
}
}
}
public static void Load(IRdfHandler handler, string filename, Stream inputStream, IRdfReader parser)
{
if (handler == null)
{
throw new RdfParseException("Cannot read RDF using a null RDF Handler");
}
if (inputStream == null)
{
throw new RdfParseException("Cannot read RDF from a null Stream");
}
if (parser == null)
{
if (filename != null)
{
try
{
String ext = MimeTypesHelper.GetTrueFileExtension(filename);
parser = MimeTypesHelper.GetParserByFileExtension(ext);
}
catch (RdfParserSelectionException)
{
//If error then we couldn't determine MIME Type from the File Extension
RaiseWarning("Unable to select a parser by determining MIME Type from the File Extension");
}
}
}
if (parser == null)
{
//Unable to determine format from File Extension
//Read file in locally and use the StringParser to select a parser
RaiseWarning("Attempting to select parser based on analysis of the data file, this requires loading the file into memory");
StreamReader reader = new StreamReader(inputStream);
String data = reader.ReadToEnd();
reader.Close();
parser = StringParser.GetParser(data);
RaiseWarning("Used the StringParser to guess the parser to use - it guessed " + parser.GetType().Name);
parser.Warning += RaiseWarning;
parser.Load(handler, new StringReader(data));
}
else
{
//Parser was selected based on File Extension or one was explicitly specified
parser.Warning += RaiseWarning;
parser.Load(handler, new StreamReader(inputStream));
}
}
/// <summary>
/// Loads the contents of the given File using a RDF Handler using the given RDF Parser
/// </summary>
/// <param name="handler">RDF Handler to use</param>
/// <param name="filename">File to load from</param>
/// <param name="parser">Parser to use</param>
public static void Load(IRdfHandler handler, String filename, IRdfReader parser)
{
if (handler == null)
{
throw new RdfParseException("Cannot read RDF using a null RDF Handler");
}
if (filename == null)
{
throw new RdfParseException("Cannot read RDF from a null File");
}
//Try to get a Parser from the File Extension if one isn't explicitly specified
if (parser == null)
{
try
{
parser = MimeTypesHelper.GetParser(MimeTypesHelper.GetMimeTypes(Path.GetExtension(filename)));
RaiseWarning("Selected Parser " + parser.ToString() + " based on file extension, if this is incorrect consider specifying the parser explicitly");
}
catch (RdfParserSelectionException)
{
//If error then we couldn't determine MIME Type from the File Extension
RaiseWarning("Unable to select a parser by determining MIME Type from the File Extension");
}
}
if (parser == null)
{
//Unable to determine format from File Extension
//Read file in locally and use the StringParser to select a parser
RaiseWarning("Attempting to select parser based on analysis of the data file, this requires loading the file into memory");
StreamReader reader = new StreamReader(filename);
String data = reader.ReadToEnd();
reader.Close();
parser = StringParser.GetParser(data);
RaiseWarning("Used the StringParser to guess the parser to use - it guessed " + parser.GetType().Name);
parser.Warning += RaiseWarning;
parser.Load(handler, new StringReader(data));
}
else
{
//Parser was selected based on File Extension or one was explicitly specified
parser.Warning += RaiseWarning;
parser.Load(handler, filename);
}
}
/// <summary>
/// Loads RDF data using an RDF Handler from a data: URI
/// </summary>
/// <param name="handler">RDF Handler</param>
/// <param name="u">URI to load from</param>
/// <remarks>
/// Invokes the normal <see cref="UriLoader">UriLoader</see> instead if a the URI provided is not a data: URI
/// </remarks>
/// <exception cref="UriFormatException">Thrown if the metadata portion of the URI which indicates the MIME Type, Character Set and whether Base64 encoding is used is malformed</exception>
public static void Load(IRdfHandler handler, Uri u)
{
if (u == null)
{
throw new RdfParseException("Cannot load RDF from a null URI");
}
if (handler == null)
{
throw new RdfParseException("Cannot read RDF into a null RDF Handler");
}
if (!u.Scheme.Equals("data"))
{
// Invoke the normal URI Loader if not a data: URI
UriLoader.Load(handler, u);
return;
}
String mimetype = "text/plain";
bool mimeSet = false;
bool base64 = false;
String[] uri = u.AbsolutePath.Split(',');
String metadata = uri[0];
String data = uri[1];
// Process the metadata
if (metadata.Equals(String.Empty))
{
// Nothing to do
}
else if (metadata.Contains(';'))
{
if (metadata.StartsWith(";"))
{
metadata = metadata.Substring(1);
}
String[] meta = metadata.Split(';');
for (int i = 0; i < meta.Length; i++)
{
if (meta[i].StartsWith("charset="))
{
// OPT: Do we need to process the charset parameter here at all?
// String charset = meta[i].Substring(meta[i].IndexOf('=') + 1);
}
else if (meta[i].Equals("base64"))
{
base64 = true;
}
else if (meta[i].Contains('/'))
{
mimetype = meta[i];
mimeSet = true;
}
else
{
throw new UriFormatException("This data: URI appears to be malformed as encountered the parameter value '" + meta[i] + "' in the metadata section of the URI");
}
}
}
else
{
if (metadata.StartsWith("charset="))
{
// OPT: Do we need to process the charset parameter here at all?
}
else if (metadata.Equals(";base64"))
{
base64 = true;
}
else if (metadata.Contains('/'))
{
mimetype = metadata;
mimeSet = true;
}
else
{
throw new UriFormatException("This data: URI appears to be malformed as encountered the parameter value '" + metadata + "' in the metadata section of the URI");
}
}
// Process the data
if (base64)
{
StringWriter temp = new StringWriter();
foreach (byte b in Convert.FromBase64String(data))
{
temp.Write((char)((int)b));
}
data = temp.ToString();
}
else
{
data = Uri.UnescapeDataString(data);
}
// Now either select a parser based on the MIME type or let StringParser guess the format
try
{
if (mimeSet)
{
// If the MIME Type was explicitly set then we'll try and get a parser and use it
IRdfReader reader = MimeTypesHelper.GetParser(mimetype);
reader.Load(handler, new StringReader(data));
}
else
{
// If the MIME Type was not explicitly set we'll let the StringParser guess the format
IRdfReader reader = StringParser.GetParser(data);
reader.Load(handler, new StringReader(data));
}
}
catch (RdfParserSelectionException)
{
// If we fail to get a parser then we'll let the StringParser guess the format
IRdfReader reader = StringParser.GetParser(data);
reader.Load(handler, new StringReader(data));
}
}
