Browser

Browser is returned by model:browse(). It is used to browse the address space.

browser:children()

Get the children of the parent node.

Returns:

Array of browser objects.

browser:path(pathElements)

Resolve a path in the address space starting from the root node.

PathElements:

Path elements. You can mix strings, QualifiedName values, and table elements in the same path.

Strings and QualifiedName values follow hierarchical references. Table elements can select a specific reference type.

Table path elements use these fields:

Field	Type	Description
TargetName	string or QualifiedName	Required browse name of the target node.
ReferenceTypeId	NodeId, optional	Reference type to follow. Defaults to hierarchical references.
IsInverse	boolean, optional	Follow inverse references when true. Defaults to false.
IncludeSubtypes	boolean, optional	Include subtypes of ReferenceTypeId. Defaults to true.

Returns:

Browser object.

Raises:

if the path is not found, or other error occurs.

Examples:

Get one child node by browse name:

-- Resolve path to the objects folder node with id i=85
local objectsFolderPath = model:browse():path("Objects")

Follow hierarchical references:

-- Resolve path to the server object node
local serverObject = model:browse():path({"Objects", "Server"})

Mix browse names and table parameters:

-- Resolve path to server object type definition node
-- it is possible to mix string and table in the path:
--   * for strings it will browsed hierarhical references
--   * for tables it will browsed references by the ReferenceTypeId
local serverObjectTypeDefinition = model:browse():path({
  "Objects", -- #1
  "Server",  -- #2
  {          -- #3
    TargetName = "ServerType", -- This is either a strinf or a QualifiedName
    ReferenceTypeId = ua.ReferenceType.HasTypeDefinition,
    IncludeSubtypes = false,
    IsInverse = false,
  }
})

print(serverObjectTypeDefinition.Attrs.BrowseName.Name) -- "ServerType"
print(serverObjectTypeDefinition.Attrs.NodeId) -- "i=2253"

Full source

browser:getNode(nodeId)

Get the browser object by identifier. Result object will have methods according to the node class.

NodeId:

Node identifier.

Returns:

Browser object.

browser:objectsFolder()

Returns a node under which all the objects are placed.

Returns:

Browser object.

Example:

-- Get the objects folder node with id i=85
local objectsFolder = model:browse():objectsFolder()
print(objectsFolder.Attrs.BrowseName.Name) -- "Objects"
print(objectsFolder.Attrs.NodeId) -- "i=85"

Full source

browser:typesFolder()

Returns a node under which all the types are placed.

Returns:

Browser object.

Example:

-- Resolve path to the server type node which is a type of server object instance
local serverType = model:browse():typesFolder():path({
  "ObjectTypes",
  "BaseObjectType",
  "ServerType"
})
print(serverType.Attrs.BrowseName.Name) -- "ServerType"
print(serverType.Attrs.NodeId) -- "i=2253"

Full source