Class: Ord

baja. Ord


new Ord()

Object Resolution Descriptor.

An ORD is how we can access Objects in the Server from BajaScript. It's
similar to a URI but is much more powerful and extensible. For more
information, please see the Niagara developer documentation on ORDs and how
they're used.

If more than one ORD needs to be resolved then use a baja.BatchResolve.

This Constructor shouldn't be invoked directly. Please use the make()
methods to create an instance of an ORD.

See:
Example

Resolve an ORD

baja.Ord.make("station:|slot:/Folder/NumericWritable").get({ lease: true })
    .then(function (numericWritable) {
      baja.outln(numericWritable.getOutDisplay());
    });

Extends

Members


<static> DEFAULT :baja.Ord

Default ORD instance.

Type:

Methods


<static> make(ord)

Make an ORD.

The argument can be a String, Ord or an Object.

If an Object is passed in then if there's a base and child property,
this will be used to construct the ORD (by calling toString on each).
Otherwise toString will be called on the Object for the ORD.

Parameters:
Name Type Description
ord String | baja.Ord | Object
Returns:
Type
baja.Ord
Example

Resolve an ORD

baja.Ord.make("station:|slot:/Folder/NumericWritable").get({ lease: true })
    .then(function (numericWritable) {
      baja.outln(numericWritable.getOutDisplay());
    });

<static> replaceBackups(ord)

Slot and file path ord queries may contain "../" to do relative traversal up the tree. If
there is more than one backup, the ord will contain "/../", which will be replaced by the
browser within a URL by removing other sections. For example, https://127.0.0.1/a/b/c/d/../e/f
is converted to https://127.0.0.1/a/b/c/e/f and https://127.0.0.1/a/b/c/d/../../e/f is
converted to https://127.0.0.1/a/b/c/f. This will result in unintended behavior in subsequent
ord resolution with that URL. Therefore, all but the last "../" is replaced with {@code
":..|"}. This function replicates the behavior of BOrdUtil#replaceBackups.

Parameters:
Name Type Description
ord baja.Ord

ord that is searched for "../" backups

Since:
  • Niagara 4.3U1
Returns:

the original ord if no changes are necessary or an updated ord with the
necessary replacements

Type
baja.Ord

decodeAsync(str [, batch])

The string encoding of certain Simples may include Type information, or
other data that may be require asynchronous operations to decode. BOX is
designed to handle these situations when decoding data from the station,
but when user code needs to decode string-encoded Simples directly, prefer
this method as it gives the individual Simple a chance to import Types,
etc. to ensure that the decoded Simple is fully correct.

The default implementation just returns decodeFromString directly.

Parameters:
Name Type Argument Description
str string
batch baja.comm.Batch <optional>

optional batch to use

Inherited From:
Returns:

may return the Simple instance
directly, or a Promise resolving to same - so wrap in Promise.resolve()
if unsure.

Type
baja.Simple | Promise.<baja.Simple>

decodeFromString(str)

Decode an ORD from a String.

Parameters:
Name Type Description
str String

the ORD String.

Overrides:
Returns:

the decoded ORD.

Type
baja.Ord

encodeToString()

Encode an ORD to a String.

Overrides:
Returns:

the ORD encoded to a String.

Type
String

equals(obj)

Equality test.

Parameters:
Name Type Description
obj
Inherited From:
Returns:
Type
Boolean

equivalent(obj)

Equivalence test.

equivalent() is used to compare if two Objects have equivalent
state, but might not want to return true for equals since it
it has implied semantics for many operations. The default
implementation returns the result of baja.Object#equals.

Parameters:
Name Type Description
obj
Inherited From:
Returns:
Type
Boolean

get( [obj])

Resolve the ORD and get the resolved Object from the ORD Target.

This method calls baja.Ord#resolve and calls get on the ORD
Target to pass the object onto the ok function callback.

For more information on how to use this method please see
baja.Ord#resolve.

Parameters:
Name Type Argument Description
obj Object <optional>
See:
  • module:baja/ord/OrdTarget#resolve
Returns:

a promise that will be resolved with the value specified
by the ORD.

Type
Promise
Example

Resolve/get an ORD

baja.Ord.make("service:baja:UserService|slot:jack").get({ lease: true })
    .then(function (user) {
      baja.outln(user.get('fullName'));
    })
    .catch(function (err) {
      baja.error('ORD failed to resolve: ' + err);
    });

getAgents( [is], batch)

Returns a promise that resolves to the agent list for this Object.

Parameters:
Name Type Argument Description
is Array.<String> <optional>

An optional array of filters to add to the
agent query.

batch baja.comm.Batch

An optional object used to batch network
calls together.

Inherited From:
See:
Returns:

A promise that will resolve with the Agent Info.

Type
Promise

getDataTypeSymbol()

Return the data type symbol.

Returns:

the Symbol used for encoding this data type (primarily
used for facets).

Type
String

getIcon()

Return the Object's Icon.

Inherited From:
Returns:
Type
baja.Icon

getType()

Get the type of this instance.

Inherited From:
Returns:
Type
Type

make(ord)

Make an ORD.

Parameters:
Name Type Description
ord String | baja.Ord | Object
Overrides:
See:
Returns:
Type
baja.Ord

newCopy( [exact])

Every value may be cloned using the newCopy method.

Please note that Simples are immutable so they don't
allocate a new instance.

Parameters:
Name Type Argument Description
exact Boolean <optional>

true if an exact copy of the value should be
made (only valid in the Component architecture).

Inherited From:
See:
Returns:

a copy of the value (or the same instance if the value is a
Simple).


normalize()

Return a normalized version of the ORD.

Returns:
Type
baja.Ord

parse()

Parse an ORD to a number of ORD Query objects.

Returns:

a list of ORDs to resolve.

Type
baja.OrdQueryList

relativizeToSession()

Relativize is used to extract the relative portion
of this ord within an session:

  1. First the ord is normalized.
  2. Starting from the left to right, if any queries are
    found which return true for isSession(), then remove
    everything from that query to the left.
See:
Returns:
Type
baja.Ord

resolve( [obj])

Resolve an ORD.

Resolving an ORD consists of parsing and processing it to get a result.
The result is an ORD Target.

Any network calls that result from processing an ORD are always
asynchronous.

The resolve method requires an ok function callback or an object
literal that contains the method's arguments.

Please note that unlike other methods that require network calls, no
batch object can be specified!

Parameters:
Name Type Argument Description
obj Object <optional>

the object literal that contains the method's
arguments.

Properties
Name Type Argument Description
ok function <optional>

(Deprecated: use Promise) the ok function called
once the ORD has been successfully resolved. The ORD Target is passed to
this function when invoked.

fail function <optional>

(Deprecated: use Promise) the fail function
called if the ORD fails to resolve. An error cause is passed to this
function when invoked.

base <optional>

the base Object to resolve the ORD against.

lease Boolean <optional>

if defined and true, any Components are
temporarily subscribed.

leaseTime Number | baja.RelTime <optional>

the amount of time in
milliseconds to lease for (lease argument must be true). As well as a
Number, this can also be a baja.RelTime. If undefined, BajaScript's
default lease time will be used.

subscriber baja.Subscriber <optional>

if defined the Component is
subscribed using this Subscriber.

cursor Object <optional>

if defined, this specifies parameters for
iterating through a Cursor (providing the ORD resolves to a Collection
or Table). For more information, please see
baja.coll.tableMixIn.cursor.

See:
Returns:

a promise that will be resolved with an
OrdTarget when the ORD has been resolved.

Type
Promise.<Object>
Example

Resolve an ORD

baja.Ord.make("station:|slot:/").resolve({
    lease: true // ensure any resolved Components are leased
  })
    .then(function (target) {
      // process the ORD Target
    })
    .catch(function (err) {
      // ORD failed to resolve
    });

toString()

Return an String representation of the object.

Overrides:
Returns:

a String representation of an ORD.

Type
String

toUri()

Return the ORD as a URI that can be used in a browser.

Returns:
Type
String

valueOf()

Return the inner value of this Object.

Overrides:
Returns:

a String representation of an ORD.

Type
String