/// <summary>
/// Opens a reader to the given source file.
/// </summary>
/// <param name="sourceFile">The source file to be loaded.</param>
/// <param name="importerConfig">The configuration of the importer.</param>
internal static StreamReader OpenReader(ResourceLink sourceFile, CsvImporterConfig importerConfig)
{
if (importerConfig.Encoding != null)
{
return(new StreamReader(sourceFile.OpenInputStream(), importerConfig.Encoding));
}
else
{
return(new StreamReader(sourceFile.OpenInputStream()));
}
}
/// <summary>
/// Tries to laod the given table file.
/// Null is returned if opening is not possible.
/// </summary>
/// <param name="tableFileSource">The file to be loaded.</param>
/// <param name="importerConfig">Configuration for the import process.</param>
public ITableFile OpenTableFile(ResourceLink tableFileSource, TableImporterConfig importerConfig)
{
CsvImporterConfig csvImporterConfig = importerConfig as CsvImporterConfig;
if (csvImporterConfig == null)
{
throw new SeeingSharpException(string.Format("Invalid configuration object: {0}", importerConfig));
}
return(new CsvTableFile(tableFileSource, csvImporterConfig));
}
/// <summary>
/// Creates a default importer configuration object.
/// </summary>
/// <param name="sourceFile">The source file for which the default configuration should be created.</param>
public TableImporterConfig CreateDefaultConfig(ResourceLink sourceFile)
{
switch (sourceFile.FileExtension.ToLower())
{
case "csv":
return(new CsvImporterConfig());
case "txt":
CsvImporterConfig result = new CsvImporterConfig();
result.SeparationChar = '\t';
return(result);
default:
return(new CsvImporterConfig());
}
}
/// <summary>
/// Initializes a new instance of the <see cref="CsvTableFile"/> class.
/// </summary>
/// <param name="tableFileSource">The file from which to load the table data.</param>
/// <param name="importerConfig">The configuration for the import process.</param>
internal CsvTableFile(ResourceLink tableFileSource, CsvImporterConfig importerConfig)
{
m_importerConfig = importerConfig;
m_tableFileSource = tableFileSource;
using (StreamReader inStreamReader = CsvUtil.OpenReader(tableFileSource, importerConfig))
{
// Read until we reach the header row
for (int loop = 0; loop < m_importerConfig.HeaderRowIndex; loop++)
{
inStreamReader.ReadLine();
}
// Read the header row and ensure that we have something there
string headerRow = inStreamReader.ReadLine();
if (string.IsNullOrEmpty(headerRow))
{
throw new SeeingSharpException(string.Format("No header row found in csv file{0}", tableFileSource));
}
m_headerRow = new CsvTableHeaderRow(this, headerRow);
}
}