/// <summary>
/// Used to to instantiate and return the chain of stream based filters.
/// </summary>
/// <param name="physicalTextReader">The <see cref="PhysicalTextReader" /> that is the source of input to the filter chain.</param>
/// <remarks>
/// The <paramref name="physicalTextReader" /> is the first <see cref="Filter" />
/// in the chain, which is based on a physical stream that feeds the chain.
/// </remarks>
/// <returns>
/// The last <see cref="Filter" /> in the chain.
/// </returns>
internal Filter GetBaseFilter(PhysicalTextReader physicalTextReader)
{
// if there is no a PhysicalTextReader then the chain is empty
if (physicalTextReader == null)
{
return(null);
}
// the physicalTextReader must be the base filter (Based on a physical stream)
if (!physicalTextReader.Base)
{
throw new BuildException(ResourceUtils.GetString("String_UseBaseFilter"), Location);
}
// build the chain and place the base filter at the beginning.
Filter parentFilter = physicalTextReader;
// iterate through the collection of filter elements and instantiate each filter.
foreach (Filter filter in Filters)
{
if (filter.IfDefined && !filter.UnlessDefined)
{
filter.Chain(parentFilter);
filter.InitializeFilter();
parentFilter = filter;
}
}
return(parentFilter);
}
private void WriteWithFilters()
{
StreamReader FileReader = null;
StreamWriter Writer = null;
StringReader Reader = null;
PhysicalTextReader ChainedReader = null;
try
{
FileReader = this.File.OpenText();
Reader = new StringReader(FileReader.ReadToEnd());
FileReader.Close();
FileReader = null;
Writer = this.File.CreateText();
ChainedReader = new PhysicalTextReader(Reader);
Filter FilterReader = this.Filter.GetBaseFilter(ChainedReader);
while (!false)
{
int Focus = FilterReader.Read();
if (!(Focus > -1))
{
break; // TODO: might not be correct. Was : Exit Do
}
Writer.Write((Char)Focus);
}
}
finally
{
if (FileReader != null)
{
FileReader.Close();
}
if (Writer != null)
{
Writer.Close();
}
if (ChainedReader != null)
{
ChainedReader.Close();
}
if (Reader != null)
{
Reader.Close();
}
}
}
private void WriteWithFilters()
{
TextWriter Writer = null;
StringReader Reader = null;
PhysicalTextReader ChainedReader = null;
try
{
Writer = this.GetWriter();
Reader = new StringReader(this.Text.Value);
ChainedReader = new PhysicalTextReader(Reader);
Filter FilterReader = this.Filter.GetBaseFilter(ChainedReader);
while (!false)
{
int Focus = FilterReader.Read();
if (!(Focus > -1))
{
break; // TODO: might not be correct. Was : Exit Do
}
Writer.Write((Char)Focus);
}
this.Properties[this.OutProperty] = Writer.ToString();
}
finally
{
if (Writer != null)
{
Writer.Close();
}
if (ChainedReader != null)
{
ChainedReader.Close();
}
if (Reader != null)
{
Reader.Close();
}
}
}
/// <summary>
/// Used to to instantiate and return the chain of stream based filters.
/// </summary>
/// <param name="physicalTextReader">The <see cref="PhysicalTextReader" /> that is the source of input to the filter chain.</param>
/// <remarks>
/// The <paramref name="physicalTextReader" /> is the first <see cref="Filter" />
/// in the chain, which is based on a physical stream that feeds the chain.
/// </remarks>
/// <returns>
/// The last <see cref="Filter" /> in the chain.
/// </returns>
internal Filter GetBaseFilter(PhysicalTextReader physicalTextReader)
{
// if there is no a PhysicalTextReader then the chain is empty
if (physicalTextReader == null) {
return null;
}
// the physicalTextReader must be the base filter (Based on a physical stream)
if (!physicalTextReader.Base) {
throw new BuildException(ResourceUtils.GetString("String_UseBaseFilter"), Location);
}
// build the chain and place the base filter at the beginning.
Filter parentFilter = physicalTextReader;
// iterate through the collection of filter elements and instantiate each filter.
foreach (Filter filter in Filters) {
if (filter.IfDefined && !filter.UnlessDefined) {
filter.Chain(parentFilter);
filter.InitializeFilter();
parentFilter = filter;
}
}
return parentFilter;
}
