com.pixelmed.dicom
Class SequenceAttribute

java.lang.Object
  com.pixelmed.dicom.Attribute
      com.pixelmed.dicom.SequenceAttribute

public class SequenceAttribute
extends Attribute

A concrete class specializing Attribute for Sequence (SQ) attributes.

Though an instance of this class may be created using its constructors, there is also a factory class, AttributeFactory.

See Also:

SequenceItem, Attribute, AttributeFactory, AttributeList

Field Summary

Fields inherited from class com.pixelmed.dicom.Attribute

valueLength, valueMultiplicity

Constructor Summary

SequenceAttribute(AttributeTag t)
Construct an (empty) attribute.

Method Summary

void	addItem(AttributeList item) Add an item to the sequence (after any existing items).
void	addItem(AttributeList item, long byteOffset) Add an item to the sequence (after any existing items), keeping tracking of input byte offsets.
void	addItem(SequenceItem item) Add an item to the sequence (after any existing items).
static AttributeList	getAttributeListFromWithinSequenceWithSingleItem(AttributeList list, AttributeTag sequenceTag) Extract the AttributeList of the first item from a specified sequence from within a list of attributes.
static AttributeList	getAttributeListFromWithinSequenceWithSingleItem(SequenceAttribute sequenceAttribute) Extract the AttributeList of the first item from a sequence.
SequenceItem	getItem(int index) Get particular item in the sequence.
static String	getMeaningOfCodedSequenceAttributeOrDefault(AttributeList list, AttributeTag tag, String dflt) Extract the code meaning attribute value from within the first item of the specified code sequence from within a list of attributes.
static Attribute	getNamedAttributeFromWithinSequenceWithSingleItem(AttributeList list, AttributeTag sequenceTag, AttributeTag namedTag) Extract the specified attribute from within the first item of the specified sequence from within a list of attributes.
static Attribute	getNamedAttributeFromWithinSequenceWithSingleItem(SequenceAttribute sequenceAttribute, AttributeTag namedTag) Extract the specified attribute from the first item of the specified sequence.
int	getNumberOfItems() Get the number of items in the sequence.
byte[]	getVR() Get the value representation of this attribute (SQ).
Iterator	iterator() Get an Iterator of the items in the sequence.
void	removeValues() Remove any existing values, making the attribute empty (zero length).
String	toString(DicomDictionary dictionary) Dump the contents of the attribute as a human-readable string.
void	write(DicomOutputStream o) Write the entire attribute (including values) to the output stream.

Methods inherited from class com.pixelmed.dicom.Attribute

addValue, addValue, addValue, addValue, addValue, addValue, addValue, getByteValues, getDelimitedStringValuesOrDefault, getDelimitedStringValuesOrDefault, getDelimitedStringValuesOrDefault, getDelimitedStringValuesOrDefault, getDelimitedStringValuesOrEmptyString, getDelimitedStringValuesOrEmptyString, getDelimitedStringValuesOrEmptyString, getDelimitedStringValuesOrEmptyString, getDelimitedStringValuesOrNull, getDelimitedStringValuesOrNull, getDelimitedStringValuesOrNull, getDelimitedStringValuesOrNull, getDoubleValues, getDoubleValues, getElement, getFloatValues, getGroup, getIntegerValues, getIntegerValues, getLongValues, getLongValues, getOriginalStringValues, getPaddedVL, getShortValues, getSingleDoubleValueOrDefault, getSingleDoubleValueOrDefault, getSingleIntegerValueOrDefault, getSingleIntegerValueOrDefault, getSingleLongValueOrDefault, getSingleLongValueOrDefault, getSingleStringValueOrDefault, getSingleStringValueOrDefault, getSingleStringValueOrDefault, getSingleStringValueOrDefault, getSingleStringValueOrEmptyString, getSingleStringValueOrEmptyString, getSingleStringValueOrEmptyString, getSingleStringValueOrEmptyString, getSingleStringValueOrNull, getSingleStringValueOrNull, getSingleStringValueOrNull, getSingleStringValueOrNull, getStringValues, getStringValues, getStringValues, getStringValues, getTag, getVL, getVM, getVRAsString, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValues, setValues, setValues, toString, writeBase

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SequenceAttribute

public SequenceAttribute(AttributeTag t)

Construct an (empty) attribute.

Parameters:

t - the tag of the attribute

Method Detail

write

public void write(DicomOutputStream o)
           throws DicomException,
                  IOException

Description copied from class: Attribute

Write the entire attribute (including values) to the output stream.

Specified by:

write in class Attribute

Parameters:

o -

Throws:

IOException

DicomException

toString

public String toString(DicomDictionary dictionary)

Description copied from class: Attribute

Dump the contents of the attribute as a human-readable string.

No new line is appended.

The result is of the form:

 (0xgggg,0xeeee) Name VR=<XX> VL=<0xnnnn> <...>
 

For example:

 (0x0018,0x0020) ScanningSequence VR=<CS> VL=<0x2> <GR>
 

Overrides:

toString in class Attribute

Parameters:

dictionary - the dictionary to use to look up the name

Returns:

a single String value

removeValues

public void removeValues()

Description copied from class: Attribute

Remove any existing values, making the attribute empty (zero length).

Specified by:

removeValues in class Attribute

Throws:

DicomException

addItem

public void addItem(SequenceItem item)

Add an item to the sequence (after any existing items).

Parameters:

item -

addItem

public void addItem(AttributeList item)

Add an item to the sequence (after any existing items).

Parameters:

item - the list of attributes that comprise the item

addItem

public void addItem(AttributeList item,
                    long byteOffset)

Add an item to the sequence (after any existing items), keeping tracking of input byte offsets.

Parameters:

item - the list of attributes that comprise the item

byteOffset - the byte offset in the input stream of the start of the item

iterator

public Iterator iterator()

Get an Iterator of the items in the sequence.

Returns:

a Iterator of items, each encoded as an SequenceItem

getNumberOfItems

public int getNumberOfItems()

Get the number of items in the sequence.

Returns:

the number of items

getItem

public SequenceItem getItem(int index)

Get particular item in the sequence.

Parameters:

index - which item to return, numbered from zero

Returns:

a SequenceItem, null if no items or no such item

getVR

public byte[] getVR()

Get the value representation of this attribute (SQ).

Overrides:

getVR in class Attribute

Returns:

'S','Q' in ASCII as a two byte array; see ValueRepresentation

getAttributeListFromWithinSequenceWithSingleItem

public static AttributeList getAttributeListFromWithinSequenceWithSingleItem(SequenceAttribute sequenceAttribute)

Extract the AttributeList of the first item from a sequence.

Parameters:

sequenceAttribute - the sequence attribute that has one item (may be null in which case returns null)

Returns:

the AttributeList if found else null

getAttributeListFromWithinSequenceWithSingleItem

public static AttributeList getAttributeListFromWithinSequenceWithSingleItem(AttributeList list,
                                                                             AttributeTag sequenceTag)

Extract the AttributeList of the first item from a specified sequence from within a list of attributes.

Parameters:

list - the list that contains the sequence (may not be null)

sequenceTag - the tag of the sequence attribute that has one item

Returns:

the AttributeList if found else null

getNamedAttributeFromWithinSequenceWithSingleItem

public static Attribute getNamedAttributeFromWithinSequenceWithSingleItem(SequenceAttribute sequenceAttribute,
                                                                          AttributeTag namedTag)

Extract the specified attribute from the first item of the specified sequence.

Parameters:

sequenceAttribute - the sequence attribute that has one item (may be null in which case returns null)

namedTag - the tag of the attribute within the item of the sequence

Returns:

the attribute if found else null

getNamedAttributeFromWithinSequenceWithSingleItem

public static Attribute getNamedAttributeFromWithinSequenceWithSingleItem(AttributeList list,
                                                                          AttributeTag sequenceTag,
                                                                          AttributeTag namedTag)

Extract the specified attribute from within the first item of the specified sequence from within a list of attributes.

Parameters:

list - the list that contains the sequence (may not be null)

sequenceTag - the tag of the sequence attribute that has one item

namedTag - the tag of the attribute within the item of the sequence

Returns:

the attribute if found else null

getMeaningOfCodedSequenceAttributeOrDefault

public static String getMeaningOfCodedSequenceAttributeOrDefault(AttributeList list,
                                                                 AttributeTag tag,
                                                                 String dflt)

Extract the code meaning attribute value from within the first item of the specified code sequence from within a list of attributes.

Parameters:

list - the list that contains the code sequence (may not be null)

tag - the tag of the code sequence attribute that has one item

dflt - what to return if there is no such sequence attribute or it is empty or has no code meaning attribute