Default Method

Summary

Restores the specified Context Group to the default values as stored in the internal table maintained by LEADTOOLS.

Syntax

Objective-C

C++/CLI

public bool Default( 
   DicomContextGroup contextGroup 
)

- (BOOL)isDefaultContextGroup:(LTDicomContextGroup *)group;

public: 
bool Default(  
   DicomContextGroup^ contextGroup 
)

Parameters

contextGroup
DicomContextGroup object that specifies the Context Group to be restored. If this parameter is set to null, the method restores all the Context Groups in the Context Group Table.

Return Value

true, the specified Context Group was restored successfully. false, the method failed to allocate memory.

Remarks

LEADTOOLS maintains an internal table of the Context Groups defined by the DICOM Content Mapping Resource (DCMR). Use the Load method to load Context Groups from this table into the Context Group Table. After a Context Group is loaded, its Coded Concepts can be deleted, their Code Meanings can be modified, and new Concepts can be added to the Group. Use the Default method to discard all the changes made to the Context Group.
If the internal table does not contain a Context Group with the same Context ID as that of the specified Context Group, the method will just return successfully without affecting the Context Group.

Example

using Leadtools; 
using Leadtools.Dicom; 
 
 
       
public void InsertContextGroup() 
{ 
 
   DicomDateTimeValue version = new DicomDateTimeValue(); 
 
   version.Year = 2004; 
   version.Month = 3; 
   version.Day = 22; 
   version.Hours = 0; 
   version.Minutes = 0; 
   version.Seconds = 0; 
   version.Fractions = 0; 
   version.Offset = 0; 
 
   // Insert a (testing) Context Group 
   DicomContextGroup group = DicomContextGroupTable.Instance.Insert("CID XXXX", "New Context Group", true, version, DicomContextGroupTableInsertFlags.None); 
   if (group == null) 
   { 
      return; 
   } 
 
   // Fill the Context Group with some (testing) Coded Concepts 
   DicomContextGroupTable.Instance.InsertCodedConcept(group, "CSD1", null, "CV1", "CM1", DicomDateTimeValue.Empty, null, DicomContextGroupTableInsertFlags.None); 
   DicomContextGroupTable.Instance.InsertCodedConcept(group, "CSD2", null, "CV2", "CM2", DicomDateTimeValue.Empty, null, DicomContextGroupTableInsertFlags.None); 
   DicomContextGroupTable.Instance.InsertCodedConcept(group, "CSD3", null, "CV3", "CM3", DicomDateTimeValue.Empty, null, DicomContextGroupTableInsertFlags.None); 
 
   EnumCodedConcepts(group); 
 
   // Delete the Context Group 
   DicomContextGroupTable.Instance.Delete(group); 
} 
 
void DisplayCodedConcept(DicomCodedConcept concept) 
{ 
   DicomContextGroup group = DicomContextGroupTable.Instance.GetContextGroup(concept); 
   StringBuilder title = new StringBuilder(); 
   StringBuilder msg = new StringBuilder(); 
 
   title.AppendFormat("Coded Concept ({0} '{1}')", group.ContextIdentifier, group.ContextIdentifierValue); 
 
   msg.AppendFormat("Coding Scheme Designator: {0}{1}Coding Scheme Version: {2}{1}Code Value:{3}{1}Code Meaning: {4}", 
         concept.CodingSchemeDesignator, 
         Environment.NewLine, 
         concept.CodingSchemeVersion != null ? concept.CodingSchemeVersion : "N/A", 
         concept.CodeValue, 
         concept.CodeMeaning); 
 
   Console.WriteLine($"{title.ToString()}: {msg.ToString()}"); 
} 
void EnumCodedConcepts(DicomContextGroup group) 
{ 
   // Enumerate the Coded Concepts in the Context Group (3 possible ways)  
 
   // One possible way to enumerate the Coded Concepts 
   DicomCodedConcept concept = DicomContextGroupTable.Instance.GetFirstCodedConcept(group); 
   while (concept != null) 
   { 
      DisplayCodedConcept(concept); 
      concept = DicomContextGroupTable.Instance.GetNextCodedConcept(concept); 
   } 
 
   // This code is commented out on purpose, it shows two other ways of  
   // enumerating the Coded Concepts 
 
   /* 
   // Another way to enumerate the Coded Concepts 
   for (int i = 0; i < DicomContextGroupTable.Instance.GetCodedConceptCount(group); i++) 
   { 
      concept = DicomContextGroupTable.Instance.FindCodedConceptByIndex(group, i); 
      DisplayCodedConcept(concept); 
   } 
 
   // A third way to enumerate the Coded Concepts 
   concept = DicomContextGroupTable.Instance.GetLastCodedConcept(group); 
   while (concept != null)  
   { 
      DisplayCodedConcept(concept); 
      concept = DicomContextGroupTable.Instance.GetPreviousCodedConcept(concept); 
   } 
   */ 
} 
 
void EnumContextGroups() 
{ 
   DicomContextGroupTable.Instance.Reset(); 
   // Load all the Context Groups 
   DicomContextGroupTable.Instance.Load(null); 
 
   // Enumerate them (3 possible ways)  
 
   // One possible way to enumerate the Context Groups 
   DicomContextGroup group = DicomContextGroupTable.Instance.GetFirst(); 
   while (group != null) 
   { 
      StringBuilder msg = new StringBuilder(); 
      msg.AppendFormat("{0}{2}{1}{2}{2}Enumerate Coded Concepts?", 
         group.ContextIdentifier, 
         group.Name, 
         Environment.NewLine); 
 
      Console.WriteLine($"Context Group: {msg}"); 
      EnumCodedConcepts(group); 
 
      group = DicomContextGroupTable.Instance.GetNext(group); 
   } 
 
   // This code is commented out on purpose, it shows two other ways of  
   // enumerating Context Groups 
 
   /* 
   // Another way to enumerate the Context Groups 
   for (int i = 0; i < DicomContextGroupTable.Instance.Count; i++) 
   { 
      group = DicomContextGroupTable.Instance.FindIndex(i);  
 
      msg.AppendFormat("{0}{2}{1}{2}{2}Enumerate Coded Concepts?", 
         group.ContextIdentifier, 
         group.Name, 
         Environment.NewLine);  
 
      DialogResult result  = MessageBox.Show(msg.ToString(), "Context Group", MessageBoxButtons.YesNoCancel); 
      if(result == DialogResult.Yes) 
      { 
         EnumCodedConcepts(group);  
      } 
      else if (result == DialogResult.Cancel)  
      { 
         break;  
      } 
   } 
 
   // A third way to enumerate the Context Groups 
   group = DicomContextGroupTable.Instance.GetLast(); 
   while (group != null)  
   { 
 
      msg.AppendFormat("{0}{2}{1}{2}{2}Enumerate Coded Concepts?", 
         group.ContextIdentifier, 
         group.Name, 
         Environment.NewLine); 
 
      DialogResult result = MessageBox.Show(msg.ToString(), "Context Group", MessageBoxButtons.YesNoCancel); 
      if (result == DialogResult.Yes) 
      { 
         EnumCodedConcepts(group); 
      } 
      else if (result == DialogResult.Cancel) 
      { 
         break; 
      } 
      group = group = DicomContextGroupTable.Instance.GetPrev(group);  
   } 
           
   */ 
} 
 
void ModifyContextGroup() 
{ 
   DicomContextGroupTable.Instance.Reset(); 
   DicomContextGroupTable.Instance.Load(null); 
 
   DicomContextGroup group = null; 
   DicomCodedConcept concept = null; 
 
   // Look for a Context Group 
   group = DicomContextGroupTable.Instance.Find(DicomContextIdentifierType.CID6019); 
   if (group == null) 
   { 
      return; 
   } 
 
   // Look for a Coded Concept in the Context Group 
   concept = DicomContextGroupTable.Instance.FindCodedConcept(group, "SRT", "F-01781"); 
   if (concept == null) 
   { 
      return; 
   } 
 
   // Set the Code Meaning of the Coded Concept (French translation)  
   if (DicomContextGroupTable.Instance.SetCodeMeaning(concept, "Situé à 1 heure") == false) 
   { 
      return; 
   } 
 
   DisplayCodedConcept(concept); 
 
   // Delete the Coded Concept 
   DicomContextGroupTable.Instance.DeleteCodedConcept(concept); 
 
   // Add a (testing) Coded Concept to the Context Group 
   concept = DicomContextGroupTable.Instance.InsertCodedConcept(group, 
                                                                  "CSD", 
                                                                  null, 
                                                                  "CV", 
                                                                  "CM", 
                                                                  DicomDateTimeValue.Empty, 
                                                                  null, 
                                                                  DicomContextGroupTableInsertFlags.None); 
 
   if (concept == null) 
   { 
      return; 
   } 
   DisplayCodedConcept(concept); 
 
   // Restore the Context Group (discard all the changes made to the Group)  
   DicomContextGroupTable.Instance.Default(group); 
   EnumCodedConcepts(group); 
   // Delete the Context Group 
   DicomContextGroupTable.Instance.Delete(group); 
}