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WlmDataSourceFileSystem Class Reference

This class encapsulates data structures and operations for connecting to a file-based data source in the framework of the DICOM basic worklist management service. More...

Inheritance diagram for WlmDataSourceFileSystem:

## Public Member Functions

| WlmDataSourceFileSystem ()
| default constructor.
| ~WlmDataSourceFileSystem ()
| destructor
OFCondition | ConnectToDataSource ()
| Connects to the data source.
OFCondition | DisconnectFromDataSource ()
| Disconnects from the data source.
void | SetDfPath (const OFString &value)
| Set value in member variable.
void | SetEnableRejectionOfIncompleteWlFiles (OFBool value)
| Set value in member variable.
OFBool | IsCalledApplicationEntityTitleSupported ()
| Checks if the called application entity title is supported.
void | HandleExistentButEmptyDescriptionAndCodeSequenceAttributes (DcmItem *dataset, const DcmTagKey &descriptionTagKey, const DcmTagKey &codeSequenceTagKey)
| This function performs a check on two attributes in the given dataset.
void | HandleExistentButEmptyReferencedStudyOrPatientSequenceAttributes (DcmDataset *dataset, const DcmTagKey &sequenceTagKey)
| This function performs a check on a sequence attribute in the given dataset.
WlmDataSourceStatusType | StartFindRequest (const DcmDataset &findRequestIdentifiers)
| Based on the search mask which was passed, this function determines all the records in the worklist database files which match the values of matching key attributes in the search mask.
DcmDataset * | NextFindResponse (WlmDataSourceStatusType &rStatus)
| This function will return the next dataset that matches the given search mask, if there is one more resulting dataset to return.
Public Member Functions inherited from WlmDataSource
| WlmDataSource ()
| default constructor.
virtual | ~WlmDataSource ()
| destructor
void | SetCalledApplicationEntityTitle (const OFString &value)
| Set value in member variable.
void | SetFailOnInvalidQuery (OFBool value)
| Set value in member variable.
void | SetNoSequenceExpansion (OFBool value)
| Set value in a member variable.
void | SetReturnedCharacterSet (WlmReturnedCharacterSetType value)
| Set value in member variable.
WlmDataSourceStatusType | CancelFindRequest ()
| This function handles a C-CANCEL Request during the processing of a C-FIND Request.
DcmAttributeTag * | GetOffendingElements ()
| Get value from member variable.
DcmLongString * | GetErrorComments ()
| Get value from member variable.
virtual void | SetDbDsn (const OFString &)
| Set value in a member variable in a derived class.
virtual void | SetDbUserName (const OFString &)
| Set value in a member variable in a derived class.
virtual void | SetDbUserPassword (const OFString &)
| Set value in a member variable in a derived class.
virtual void | SetCfgFileMatchRecords (const OFString &)
| Set value in a member variable in a derived class.
virtual void | SetCfgFileSelectValues (const OFString &)
| Set value in a member variable in a derived class.
virtual void | SetDatabaseType (WlmDatabaseType)
| Set value in a member variable in a derived class.
virtual void | SetSerialNumber (const int value)
| Set value in a member variable in a derived class.
virtual void | SetInstitutionId (const unsigned int)
| Set value in a member variable in a derived class.
virtual void | SetCreateNullvalues (OFBool)
| Set value in a member variable in a derived class.
virtual void | SetPfFileName (const OFString &)
| Set value in a member variable in a derived class.
virtual void | SetModalityToReturn (const OFString &)
| Set value in a member variable in a derived class.
virtual void | SetCommaSeparatePatientName (OFBool)
| Set value in a member variable in a derived class.
virtual void | SetReturnPatientUidInAccessionNumber (OFBool)
| Set value in a member variable in a derived class.

## Protected Member Functions

OFBool | SetReadlock ()
| This function sets a read lock on the LOCKFILE in the directory that is specified through dfPath and calledApplicationEntityTitle.
OFBool | ReleaseReadlock ()
| This function releases a read lock on the LOCKFILE in the given directory.
void | HandleNonSequenceElementInResultDataset (DcmElement *element, unsigned long idx)
| This function takes care of handling a certain non-sequence element within the structure of a certain result dataset.
void | HandleSequenceElementInResultDataset (DcmElement *element, unsigned long idx)
| This function takes care of handling a certain sequence element within the structure of a certain result dataset.
| WlmDataSourceFileSystem (const WlmDataSourceFileSystem &Src)
| Protected undefined copy-constructor.
WlmDataSourceFileSystem & | operator= (const WlmDataSourceFileSystem &Src)
| Protected undefined operator=.
Protected Member Functions inherited from WlmDataSource
OFBool | CheckSearchMask (DcmDataset *searchMask)
| This function checks if the search mask has a correct format.
void | CheckNonSequenceElementInSearchMask (DcmDataset *searchMask, int &invalidMatchingKeyAttributeCount, DcmElement *element, DcmSequenceOfItems *supSequenceElement=NULL)
| This function checks if a non-sequence element in the search mask has a correct format.
void | CheckSequenceElementInSearchMask (DcmDataset *searchMask, int &invalidMatchingKeyAttributeCount, DcmElement *element, DcmSequenceOfItems *supSequenceElement=NULL)
| This function checks if a sequence element in the search mask has a correct format.
void | ExpandEmptySequenceInSearchMask (DcmElement *&element)
| According to the 2001 DICOM standard (part 4, section C.2.2.2.6), if a search mask contains a sequence attribute which contains no item or a single empty item, all attributes from that particular sequence are in fact queried and shall be returned by the SCP.
OFBool | IsSupportedMatchingKeyAttribute (DcmElement *element, DcmSequenceOfItems *supSequenceElement=NULL)
| This function checks if the given element refers to an attribute which is a supported matching key attribute.
OFBool | IsSupportedReturnKeyAttribute (DcmElement *element, DcmSequenceOfItems *supSequenceElement=NULL)
| This function checks if the given element refers to an attribute which is a supported return key attribute.
void | ClearDataset (DcmDataset *idents)
| This function removes all elements from the given DcmDataset object.
void | PutOffendingElements (const DcmTagKey &tag)
| This function inserts the tag of an offending element into the corresponding member variable, unless this tag is already con- tained in this variable.
void | PutErrorElements (const DcmTagKey &tag)
| This function inserts the tag of an error element into the corresponding member variable, without checking if it is already contained in this variable.
OFBool | CheckMatchingKey (const DcmElement *elem)
| This function checks if the passed matching key's value only uses characters which are part of its data type's character repertoire.
OFBool | ContainsOnlyValidCharacters (const char *s, const char *charset)
| This function returns OFTrue if all the characters of s can be found in the string charset.
OFBool | GetStringValue (const DcmElement *elem, OFString &resultVal)
| This function returns the value of the given DICOM string element (attribute) in the parameter resultVal and returns OFTrue if successful.
OFString | DeleteLeadingAndTrailingBlanks (const OFString &value)
| This function makes a copy of value without leading and trailing blanks.
| WlmDataSource (const WlmDataSource &Src)
| Protected undefined copy-constructor.
WlmDataSource & | operator= (const WlmDataSource &Src)
| Protected undefined operator=.

## Protected Attributes

WlmFileSystemInteractionManager | fileSystemInteractionManager
| manager for file system interaction
OFString | dfPath
| path to database files
OFBool | enableRejectionOfIncompleteWlFiles
| indicates if wl-files which are lacking return type 1 attributes or information in such attributes shall be rejected or not
int | handleToReadLockFile
| handle to the read lock file
Protected Attributes inherited from WlmDataSource
OFBool | failOnInvalidQuery
| indicates if the application shall fail on an invalid C-Find RQ message
OFString | callingApplicationEntityTitle
| calling AE Title
OFString | calledApplicationEntityTitle
| called AE title
DcmDataset * | identifiers
| the search mask which is contained in the C-Find RQ message
DcmAttributeTag * | errorElements
| list of error elements
DcmAttributeTag * | offendingElements
| list of offending elements
DcmLongString * | errorComment
| error comment
OFBool | foundUnsupportedOptionalKey
| indicates if we encountered an unsupported optional key attribute in the search mask
OFBool | readLockSetOnDataSource
| indicates if a read lock was set on the data source
OFBool | noSequenceExpansion
| indicates if the expansion of empty sequence attributes shall take place or not
WlmReturnedCharacterSetType | returnedCharacterSet
| returned character set type
OFList< DcmDataset * > | matchingDatasets
| array of matching datasets
OFString | specificCharacterSet
| potentially specified specific character set (in search mask)
WlmSuperiorSequenceInfoType * | superiorSequenceArray
| information about superior sequence elements; necessary for inserting values into resultDataset
unsigned long | numOfSuperiorSequences
| number of elements in above array

## Detailed Description

This class encapsulates data structures and operations for connecting to a file-based data source in the framework of the DICOM basic worklist management service.

## Constructor & Destructor Documentation

## WlmDataSourceFileSystem()

WlmDataSourceFileSystem::WlmDataSourceFileSystem | ( | const WlmDataSourceFileSystem & | Src | ) |

protected

Protected undefined copy-constructor.

Shall never be called.

Parameters

  Src | Source object.

References WlmDataSourceFileSystem().

Referenced by WlmDataSourceFileSystem(), and operator=().

## Member Function Documentation

## ConnectToDataSource()

OFCondition WlmDataSourceFileSystem::ConnectToDataSource | ( |  | ) |

virtual

Connects to the data source.

Returns
  Indicates if the connection was established successfully.

Implements WlmDataSource.

## DisconnectFromDataSource()

OFCondition WlmDataSourceFileSystem::DisconnectFromDataSource | ( |  | ) |

virtual

Disconnects from the data source.

Returns
  Indicates if the disconnection was completed successfully.

Implements WlmDataSource.

## HandleExistentButEmptyDescriptionAndCodeSequenceAttributes()

void WlmDataSourceFileSystem::HandleExistentButEmptyDescriptionAndCodeSequenceAttributes | ( | DcmItem * | dataset,
|  | const DcmTagKey & | descriptionTagKey,
|  | const DcmTagKey & | codeSequenceTagKey )

This function performs a check on two attributes in the given dataset.

At two different places in the definition of the DICOM worklist management service, a description attribute and a code sequence attribute with a return type of 1C are mentioned, and the condition specifies that either the description attribute or the code sequence attribute or both shall be supported by an SCP. (I am talking about RequestedProcedureDescription vs. RequestedProcedureCodeSequence and ScheduledProcedureStepDescription vs. ScheduledProtocolCodeSequence.) In both cases, this implementation actually supports both, the description and the code sequence attributes. In cases where the description attribute is actually empty or the code sequence attribute is actually empty or contains exactly one item with an empty CodeValue and an empty CodingSchemeDesignator, we want to remove the empty attribute from the dataset. This is what this function does. (Please note, that this function will always only delete one of the two, and this function will start checking the sequence attribute.

Parameters

  dataset | Dataset in which the consistency of the two attributes shall be checked.
  descriptionTagKey | DcmTagKey of the description attribute which shall be checked.
  codeSequenceTagKey | DcmTagKey of the codeSequence attribute which shall be checked.

## HandleExistentButEmptyReferencedStudyOrPatientSequenceAttributes()

void WlmDataSourceFileSystem::HandleExistentButEmptyReferencedStudyOrPatientSequenceAttributes | ( | DcmDataset * | dataset,
|  | const DcmTagKey & | sequenceTagKey )

This function performs a check on a sequence attribute in the given dataset.

At two different places in the definition of the DICOM worklist management service, a sequence attribute with a return type of 2 is mentioned containing two 1C attributes in its item; the condition of the two 1C attributes specifies that in case a sequence item is present, then these two attributes must be existent and must contain a value. (I am talking about ReferencedStudySequence and ReferencedPatientSequence.) In cases where the sequence attribute contains exactly one item with an empty ReferencedSOPClass and an empty ReferencedSOPInstance, we want to remove the item from the sequence. This is what this function does.

Parameters

  dataset | Dataset in which the consistency of the sequence attribute shall be checked.
  sequenceTagKey | DcmTagKey of the sequence attribute which shall be checked.

## HandleNonSequenceElementInResultDataset()

void WlmDataSourceFileSystem::HandleNonSequenceElementInResultDataset | ( | DcmElement * | element,
|  | unsigned long | idx )

protected

This function takes care of handling a certain non-sequence element within the structure of a certain result dataset.

This function assumes that all elements in the result dataset are supported. In detail, a value for the current element with regard to the currently processed matching record will be requested from the fileSystemInteractionManager, and this value will be set in the element.

Parameters

  element | Pointer to the currently processed element.
  idx | Index of the matching record (identifies this record).

## HandleSequenceElementInResultDataset()

void WlmDataSourceFileSystem::HandleSequenceElementInResultDataset | ( | DcmElement * | element,
|  | unsigned long | idx )

protected

This function takes care of handling a certain sequence element within the structure of a certain result dataset.

On the basis of the matching record from the data source, this function will add items and values for all elements in these items to the current sequence element in the result dataset. This function assumes that all elements in the result dataset are supported. In case the current sequence element contains no items or more than one item, this element will be left unchanged.

Parameters

  element | Pointer to the currently processed element.
  idx | Index of the matching record (identifies this record).

## IsCalledApplicationEntityTitleSupported()

OFBool WlmDataSourceFileSystem::IsCalledApplicationEntityTitleSupported | ( |  | ) |

virtual

Checks if the called application entity title is supported.

This function expects that the called application entity title was made available for this instance through WlmDataSource::SetCalledApplicationEntityTitle(). If this is not the case, OFFalse will be returned.

Returns
  OFTrue, if the called application entity title is supported; OFFalse, if the called application entity title is not supported or it is not given.

Implements WlmDataSource.

## NextFindResponse()

DcmDataset * WlmDataSourceFileSystem::NextFindResponse | ( | WlmDataSourceStatusType & | rStatus | ) |

virtual

This function will return the next dataset that matches the given search mask, if there is one more resulting dataset to return.

In such a case, rstatus will be set to WLM_PENDING or WLM_PENDING_WARNING, depending on if an unsupported key attribute was encountered in the search mask or not. If there are no more datasets that match the search mask, this function will return an empty dataset and WLM_SUCCESS in rstatus.

Parameters

  rStatus | A value of type WlmDataSourceStatusType that can be used to decide if there are still elements that have to be returned.

Returns
  The next dataset that matches the given search mask, or an empty dataset if there are no more matching datasets in the worklist database files.

Implements WlmDataSource.

## operator=()

WlmDataSourceFileSystem & WlmDataSourceFileSystem::operator= | ( | const WlmDataSourceFileSystem & | Src | ) |

protected

Protected undefined operator=.

Shall never be called.

Parameters

  Src | Source object.

Returns
  Reference to this.

References WlmDataSourceFileSystem().

## ReleaseReadlock()

OFBool WlmDataSourceFileSystem::ReleaseReadlock | ( |  | ) |

protected

This function releases a read lock on the LOCKFILE in the given directory.

Returns
  true in case the read lock has been released successfully, false otherwise.

## SetDfPath()

void WlmDataSourceFileSystem::SetDfPath | ( | const OFString & | value | ) |

virtual

Set value in member variable.

Parameters

  value | The value to set.

Reimplemented from WlmDataSource.

## SetEnableRejectionOfIncompleteWlFiles()

void WlmDataSourceFileSystem::SetEnableRejectionOfIncompleteWlFiles | ( | OFBool | value | ) |

virtual

Set value in member variable.

Parameters

  value | The value to set.

Reimplemented from WlmDataSource.

## SetReadlock()

OFBool WlmDataSourceFileSystem::SetReadlock | ( |  | ) |

protected

This function sets a read lock on the LOCKFILE in the directory that is specified through dfPath and calledApplicationEntityTitle.

Returns
  true in case the read lock has been set successfully, false otherwise.

## StartFindRequest()

WlmDataSourceStatusType WlmDataSourceFileSystem::StartFindRequest | ( | const DcmDataset & | findRequestIdentifiers | ) |

virtual

Based on the search mask which was passed, this function determines all the records in the worklist database files which match the values of matching key attributes in the search mask.

For each matching record, a DcmDataset structure is generated which will later be returned to the SCU as a result of query. The DcmDataset structures for all matching records will be stored in the protected member variable matchingDatasets.

Parameters

  findRequestIdentifiers | Contains the search mask.

Returns
  A WlmDataSourceStatusType value denoting the following: WLM_SUCCESS: No matching records found; WLM_PENDING: Matching records found, all return keys supported by this application; WLM_PENDING_WARNING: Matching records found, not all return keys supported by this application; WLM_FAILED_IDENTIFIER_DOES_NOT_MATCH_SOP_CLASS: Error in the search mask encountered.

Implements WlmDataSource.

The documentation for this class was generated from the following file:

- dcmwlm/include/dcmtk/dcmwlm/wldsfs.h

Generated on for DCMTK Version 3.7.0 by Doxygen 1.15.0