public DxfSectionReaderBase(
IDxfStreamReader reader,
DxfDocumentBuilder builder,
NotificationEventHandler notification = null)
{
this._reader = reader;
this._builder = builder;
this._notification = notification;
}
/// <inheritdoc/>
public override CadDocument Read()
{
this._document = new CadDocument(false);
this._builder = new DxfDocumentBuilder(this._document, this.OnNotificationHandler);
this._reader = this._reader ?? this.getReader();
while (this._reader.LastValueAsString != DxfFileToken.EndOfFile)
{
if (this._reader.LastValueAsString != DxfFileToken.BeginSection)
{
this._reader.ReadNext();
continue;
}
else
{
this._reader.ReadNext();
}
switch (this._reader.LastValueAsString)
{
case DxfFileToken.HeaderSection:
this._document.Header = this.ReadHeader();
break;
case DxfFileToken.ClassesSection:
this._document.Classes = this.readClasses();
break;
case DxfFileToken.TablesSection:
this.readTables();
break;
case DxfFileToken.BlocksSection:
this.readBlocks();
break;
case DxfFileToken.EntitiesSection:
this.readEntities();
break;
case DxfFileToken.ObjectsSection:
this.readObjects();
break;
default:
this.OnNotificationHandler(this, new NotificationEventArgs($"Section not implemented {this._reader.LastValueAsString}"));
break;
}
this._reader.ReadNext();
}
this._builder.BuildDocument();
return(this._document);
}
private IDxfStreamReader getSectionHandler(string sectionName)
{
//Get the needed handler
m_reader = m_reader ?? getHandler();
//Go to the start of header section
m_reader.Find(sectionName);
return(m_reader);
}
/// <summary>
/// Read the OBJECTS section of the DXF file.
/// </summary>
private void readObjects()
{
//Get the needed handler
this._reader = this.goToSection(DxfFileToken.ObjectsSection);
DxfObjectsSectionReader reader = new DxfObjectsSectionReader(
this._reader,
this._builder,
this.OnNotificationHandler);
reader.Read();
}
/// <summary>
/// Read the ENTITIES section of the DXF file.
/// </summary>
public void ReadEntities(CadDocument document)
{
//https://help.autodesk.com/view/OARX/2021/ENU/?guid=GUID-7D07C886-FD1D-4A0C-A7AB-B4D21F18E484
//Get the needed handler
m_reader = getSectionHandler(DxfFileToken.EntitiesSection);
//Advance to the first value in the section
m_reader.ReadNext();
//Loop until the section ends
while (!m_reader.EndSectionFound)
{
document.AddEntity(readEntity());
}
}
private IDxfStreamReader goToSection(string sectionName)
{
//Get the needed handler
this._reader = this._reader ?? this.getReader();
if (this._reader.LastValueAsString == sectionName)
{
return(this._reader);
}
//Go to the start of header section
this._reader.Find(sectionName);
return(this._reader);
}
/// <summary>
/// Read the BLOCKS section of the DXF file.
/// </summary>
public void ReadBlocks()
{
//Get the needed handler
m_reader = getSectionHandler(DxfFileToken.BlocksSection);
//Advance to the first value in the section
m_reader.ReadNext();
//Loop until the section ends
while (!m_reader.EndSectionFound)
{
//if (m_reader.LastValueAsString == DxfFileToken.ClassEntry)
// classes.Add(readBlock());
//else
// m_reader.ReadNext();
}
throw new NotImplementedException();
}
/// <inheritdoc/>
public override CadHeader ReadHeader()
{
this._reader = this.goToSection(DxfFileToken.HeaderSection);
CadHeader header = new CadHeader();
Dictionary <string, DxfCode[]> headerMap = CadHeader.GetHeaderMap();
this._reader.ReadNext();
//Loop until the section ends
while (!this._reader.EndSectionFound)
{
//Get the current header variable
string currVar = this._reader.LastValueAsString;
if (this._reader.LastValueAsString == null || !headerMap.TryGetValue(currVar, out var codes))
{
//this.notificationHandler(this, new NotificationEventArgs($"Header variable not implemented {currVar}"));
this._reader.ReadNext();
continue;
}
object[] parameters = new object[codes.Length];
for (int i = 0; i < codes.Length; i++)
{
this._reader.ReadNext();
parameters[i] = this._reader.LastValue;
}
//Set the header value by name
header.SetValue(currVar, parameters);
this._reader.ReadNext();
}
return(header);
}
/// <summary>
/// Read the TABLES section of the DXF file.
/// </summary>
/// <param name="document">Document where the tables reside.</param>
public void ReadTables(CadDocument document)
{
if (document == null)
{
throw new ArgumentNullException(nameof(document));
}
//https://help.autodesk.com/view/OARX/2021/ENU/?guid=GUID-A9FD9590-C97B-4E41-9F26-BD82C34A4F9F
//Get the needed handler
m_reader = getSectionHandler(DxfFileToken.TablesSection);
//Advance to the first value in the section
m_reader.ReadNext();
//Loop until the section ends
while (!m_reader.EndSectionFound)
{
readTable(document);
if (m_reader.LastValueAsString == DxfFileToken.EndTable)
{
m_reader.ReadNext();
}
}
}
/// <summary>
/// Read the CLASSES section of the DXF file.
/// </summary>
/// <returns></returns>
public DxfClassCollection ReadClasses()
{
//Get the needed handler
m_reader = getSectionHandler(DxfFileToken.ClassesSection);
DxfClassCollection classes = new DxfClassCollection();
//Advance to the first value in the section
m_reader.ReadNext();
//Loop until the section ends
while (!m_reader.EndSectionFound)
{
if (m_reader.LastValueAsString == DxfFileToken.ClassEntry)
{
classes.Add(readClass());
}
else
{
m_reader.ReadNext();
}
}
return(classes);
}
/// <summary>
/// Read the HEADER section of the file.
/// </summary>
/// <returns></returns>
public CadHeader ReadHeader()
{
//Get the needed handler
m_reader = getSectionHandler(DxfFileToken.HeaderSection);
CadHeader header = new CadHeader();
Dictionary <string, DxfCode[]> headerMap = CadHeader.GetHeaderMap();
//Loop until the section ends
while (!m_reader.EndSectionFound)
{
//Get next key/value
m_reader.ReadNext();
//Get the current header variable
string currVar = m_reader.LastValueAsString;
if (!headerMap.TryGetValue(currVar, out var codes))
{
continue;
}
object[] parameters = new object[codes.Length];
for (int i = 0; i < codes.Length; i++)
{
m_reader.ReadNext();
parameters[i] = m_reader.LastValue;
}
//Set the header value by name
header.SetValue(currVar, parameters);
}
return(header);
}
/// <summary>
/// Read the CLASSES section of the DXF file.
/// </summary>
/// <returns></returns>
private DxfClassCollection readClasses()
{
//Get the needed handler
this._reader = this.goToSection(DxfFileToken.ClassesSection);
DxfClassCollection classes = new DxfClassCollection();
//Advance to the first value in the section
this._reader.ReadNext();
//Loop until the section ends
while (!this._reader.EndSectionFound)
{
if (this._reader.LastValueAsString == DxfFileToken.ClassEntry)
{
classes.Add(this.readClass());
}
else
{
this._reader.ReadNext();
}
}
return(classes);
}
public DxfObjectsSectionReader(IDxfStreamReader reader, DxfDocumentBuilder builder, NotificationEventHandler notification = null)
: base(reader, builder, notification)
{
}
