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%Library.ListOfObjects

Class %Library.ListOfObjects Extends (%Collection.AbstractListOfObj, %SerialObject) [ ClassType = serial, OdbcType = VARCHAR, StorageStrategy = Custom, System = 2 ]

For information on this class, see Working with Collections.

The %ListOfObjects class represents a list of references to objects, each of which is associated with a numeric position in the list. The first element in the list is stored at position 1. The objects referred to must be registered. They can be either persistent objects or non-id objects.

Internally, a %ListOfObjects object contains two lists: one for holding the OID values for the objects referred to (or their serialized state in the case of a list of non-id objects); and another for holding the OREF values for any objects that have been explicitly referred to, and hence "swizzled" into memory. Swizzling (loading an object into memory and generating an OREF value for it) happens automatically whenever the user refers to an object within the list. For example, if list is an %ListOfObjects object containing a list of Doctor objects (that is a list of OID values for Doctor objects stored in the database) then the following code fragment will automatically load the Doctor object at location 7 in the list into memory and generate an OREF value referring to the in-memory version of the Doctor object. This OREF value can then be used to access the properties and methods of the Doctor object: Set doc=list.GetAt(7) Write doc.Name Alternatively, we could use cascading dot syntax: Set name=list.GetAt(7).Name When the %ListOfObjects object is closed (removed from memory) it will close (call %Close on) all the references it has swizzled into memory. These classes can be used 'standalone' to store a collection.

Parameters​

CLASSNAMEINOID​

Parameter CLASSNAMEINOID = 0;

This parameter determines how the collection object stores OID values. If this parameter is set to 0, then partially-formed OID values, containing only an ID number, are used. If this parameter is set to 1, then fully-formed OID values, containing both a class name and an ID number, are used.

ELEMENTTYPE​

Parameter ELEMENTTYPE = "%RegisteredObject";

The type (class name) of the elements stored in the collection.

Properties​

Oref​

Property Oref As %RawString [ MultiDimensional ];

Private storage area used to hold OREF values.

ElementType​

Property ElementType As %RawString [ InitialExpression = {..#ELEMENTTYPE} ];

The type (class name) of the elements stored in the collection.

Data​

Property Data As %RawString [ MultiDimensional ];

Data is a private property used to hold the contents of the list.

Size​

Property Size As %Integer [ InitialExpression = 0 ];

Size is the number of elements contained in the list.

Methods​

SizeSet​

Method SizeSet(newvalue As %Integer) As %Status [ Private ]

Count​

Method Count() As %Integer [ CodeMode = expression, Final ]

Returns the number of elements contained in the list.

InsertList​

Method InsertList(inslist As %RawString) As %Status

Inserts a list with value inslist at the end of the list.

Returns a %Status value indicating success or failure.

InsertOrdered​

Method InsertOrdered(element As %RawString) As %Status

Inserts an element with value element into the list at the correct ordered position. The elements in the list are shifted to accommodate the new element as necessary.

Returns a %Status value indicating success or failure.

Next​

Method Next(key As %Integer = 0) As %Integer [ CodeMode = expression, Final ]

Finds and returns the index value of the element at the location following key in the list. If key is a null string (""), then Next returns the position of the first element in the list (1).

Previous​

Method Previous(key As %Integer = 0) As %Integer [ CodeMode = expression, Final ]

Finds and returns the index value of the element at the location preceding key in the list. If key is a null string (""), then Next returns the position of the last element in the list.

BuildValueArray​

ClassMethod BuildValueArray(serialized As %Binary, array As %Binary) As %Status

Constructs array(key)=value for each element in the serialval value.

Returns a %Status value indicating success or failure.

Clear​

Method Clear() As %Status

Clears the contents of the array. Both the OID and OREF values are cleared.

Returns a %Status value indicating success or failure.

Find​

Method Find(element As %ObjectIdentity, key As %Integer) As %String [ CodeMode = generator ]

Starting from, but not including, position key, Find finds the next element in the list whose OID value equals element. If key is a null string, Find starts at the beginning of the list.

Find returns the position of the found element or null string ("") if no element was found.

FindObjectId​

Method FindObjectId(id As %String, key As %Integer) As %String

Starting from, but not including, position key, FindObjectId finds the next element in the list whose ObjectId equals id. If key is a null string, Find starts at the beginning of the list.

Find returns the position of the found element or null string ("") if no element was found.

GetAt​

Method GetAt(key As %Integer) As %RegisteredObject

Finds and returns the OREF value referring to the object at position key in the list.

GetAt returns the value of the element at location key or null string ("") if no element is found.

GetObjectAt​

Method GetObjectAt(key As %Integer, force As %Integer = 0) As %ObjectIdentity

Finds and returns the OID value referring to the object at position key in the list.

Returns the value of the element at location key or null string ("") if no element is found.

GetObjectIdAt​

Method GetObjectIdAt(key As %Integer, force As %Integer = 0) As %String [ CodeMode = expression, Final ]

Finds and returns the ID value referring to the object at position key in the list.

Returns the value of the element at location key or null string ("") if no element is found.

GetNext​

Method GetNext(ByRef key As %Integer) As %RegisteredObject

Finds and returns the OREF value referring to the object at the position after key in the list. If key is a null string (""), it returns the OREF value of the first element in the list.

The value of key, which is passed by reference, is updated to the position value of the returned element or null string ("") if key is at the end of the list.

GetObjectNext​

Method GetObjectNext(ByRef key As %Integer) As %ObjectIdentity

Finds and returns the OID value referring to the object at the position after key in the list. If key is a null string (""), it returns the OID value of the first element in the list.

The value of key, which is passed by reference, is updated to the position value of the returned element or null string ("") if key is at the end of the list.

GetObjectIdNext​

Method GetObjectIdNext(ByRef key As %Integer) As %String [ CodeMode = expression, Final ]

Finds and returns the ID value referring to the object at the position after key in the list. If key is a null string (""), it returns the ID value of the first element in the list.

The value of key, which is passed by reference, is updated to the position value of the returned element or null string ("") if key is at the end of the list.

GetPrevious​

Method GetPrevious(ByRef key As %Integer) As %RegisteredObject

Finds and returns the OREF value referring to the object at the position before key in the list. If key is a null string (""), it returns the OREF value of the last element in the list.

The value of key, which is passed by reference, is updated to the position value of the returned element or null string ("") if key is at the beginning of the list.

GetObjectPrevious​

Method GetObjectPrevious(ByRef key As %Integer) As %ObjectIdentity

Finds and returns the OID value referring to the object at the position before key in the list. If key is a null string (""), it returns the OID value of the last element in the list.

The value of key, which is passed by reference, is updated to the position value of the returned element or null string ("") if key is at the beginning of the list.

GetObjectIdPrevious​

Method GetObjectIdPrevious(ByRef key As %Integer) As %String [ CodeMode = expression, Final ]

Finds and returns the ID value referring to the object at the position before key in the list. If key is a null string (""), it returns the ID value of the last element in the list.

The value of key, which is passed by reference, is updated to the position value of the returned element or null string ("") if key is at the beginning of the list.

Insert​

Method Insert(oref As %RegisteredObject) As %Status

Inserts an element with OREF value oref at the end of the list.

Returns a %Status value indicating success or failure.

InsertObject​

Method InsertObject(oid As %ObjectIdentity) As %Status

Inserts an element with OID value oid at the end of the list.

Returns a %Status value indicating success or failure.

InsertObjectId​

Method InsertObjectId(id As %String) As %Status [ CodeMode = expression, Final ]

Inserts an element with ID value id at the end of the list.

Returns a %Status value indicating success or failure.

InsertAt​

Method InsertAt(oref As %RegisteredObject, key As %Integer) As %Status

Inserts an element with OREF value oref at position key.

To make room for the new element, the elements previously at or following position key are moved up by one position.

key must be in the following range:

1 <= index <= Count() + 1

Returns a %Status value indicating success or failure.

InsertObjectAt​

Method InsertObjectAt(oid As %ObjectIdentity, key As %Integer) As %Status

Inserts an element with OID value oid at position key.

To make room for the new element, the elements previously at or following position key are moved up by one position.

key must be in the following range:

1 <= index <= Count() + 1

Returns a %Status value indicating success or failure.

InsertObjectIdAt​

Method InsertObjectIdAt(id As %String, key As %Integer) As %Status [ CodeMode = expression, Final ]

Inserts an element with ID value id at position key.

To make room for the new element, the elements previously at or following position key are moved up by one position.

key must be in the following range:

1 <= index <= Count() + 1

Returns a %Status value indicating success or failure.

RemoveAt​

Method RemoveAt(key As %Integer, Output success As %Boolean) As %ObjectIdentity

Removes the element at position key in the list. The elements following position key are moved to fill in the resulting gap.

RemoveAt returns the OID value of the removed element or null string ("") if no element was removed. It also has a success output argument that returns true if the item was removed and false if it was not.

SetAt​

Method SetAt(oref As %RegisteredObject, key As %Integer) As %Status

Sets the OREF value of the element at position key to oref.

Returns a %Status value indicating success or failure.

SetObjectAt​

Method SetObjectAt(oid As %ObjectIdentity, key As %Integer) As %Status

Sets the OID value of the element at position key to oid.

Returns a %Status value indicating success or failure.

SetObjectIdAt​

Method SetObjectIdAt(id As %String, key As %Integer) As %Status [ CodeMode = expression, Final ]

Sets the ID value of the element at position key to id.

Returns a %Status value indicating success or failure.

%AddToSaveSet​

Method %AddToSaveSet(force As %Integer = 0, refresh As %Integer = 0) As %Status

Overrides %SerialObject implementation. Scans objects for modifications in the related list (Element) and the terminated relationship list (DeleteOref). Modified/Scheduled to delete objects are added to the save graph.

%SerializeObject​

Method %SerializeObject(ByRef serial As %Binary, partial As %Integer = 0) As %Status

%UnSwizzleAt​

Method %UnSwizzleAt(key As %Integer, force As %Integer = 0) As %Status

Unswizzles (removes from memory) the individual element at position key in the list.

Returns a %Status value indicating success or failure.

%GetSerial​

Method %GetSerial(force As %Integer = 0) As %String [ CodeMode = generator, Private ]

%SetSerial​

Method %SetSerial(serialized As %String) As %Status [ Private ]

%OnConstructClone​

Method %OnConstructClone(oref As %RegisteredObject, deep As %Boolean = 0, ByRef cloned As %String) As %Status [ Private ]

%OnNew​

Method %OnNew(initvalue As %String) As %Status [ Private ]