BCD-UI

Class: DataProviderHolder

bcdui.core. DataProviderHolder

This acts as a holder for the real DataProvider and behaves like a DataProvider itself. It is possible to instantiate this even without a source, we then only become ready, once a source was set and became ready. Use this if a DataProvider or even its type is not known in the moment you need it as a parameter. If we are executed, we pass through it directly or once out source is added later. We mirror our source's state but reduce them to only initialized and loaded = ready.

new bcdui.core.DataProviderHolder(args, id)

core/dataProviders.js, line 154
Name Type Description
args object optional The argument map
Name Type Description
source bcdui.core.DataProvider optional The data provider to be wrapped, unless set later via bcdui.core.DataProviderHolder#setSource
id string optional id

Extends

Members

constantidstring

A globally unique id of the object. DataProviders do also register themselves at bcdui.factory.objectRegistry when an id is provided to the constructor. This id is only needed in declarative contexts, like jsp or, when a DataProvider is accessed in a xPath like . If not provided in the constructor, a random id starting with 'bcd' is set, but the object is not automatically registered.

constantsavedStatus

Example
if( model.getStatus() === model.savedStatus )
  ...

constantsaveFailedStatus

Methods

inherited addStatusListener(args)

core/abstractExecutable.js, line 217
Listen for any status to be reached. For use cases with the ready status (by far the most common), see onReady() and onceReady() convenience functions.
Name Type Description
args function | StatusListener | AddStatusListenerParam Either a function executed on all status transitions or a parameter map AddStatusListenerParam

inherited debugIsWaitingFor(){string}

core/dataProvider.js, line 358
Returns:
Type Description
string Human readable message, which DataProviders, this DataProvider depends on, are not currently in ready state

inherited debugStatus(){string}

core/dataProvider.js, line 371
Returns:
Type Description
string Human readable message about the current state state

inherited execute(doesRefresh)

core/abstractExecutable.js, line 532
Executes the process implemented by the concrete sub-class.
Name Type Default Description
doesRefresh boolean true optional Set this parameter to "false" if this method should do nothing when the object is already in the ready status. The default is "true" meaning that the process is re-started when it is currently ready.

inherited fetchData(){Promise}

core/dataProvider.js, line 727
asynchronously fetch data for this data provider.
Returns:
Type Description
Promise resolving once data has been loaded, first argument is this instance
Example
new bcdui.core.SimpleModel("data.xml").fetchData().then((dp)=>{ console.info(dp.getData()); })

inherited fire()

core/dataProvider.js, line 304
This informs modification listeners, registered via onChange(args), that a change set was completed and data is consistent again.
Example
// Use of data modification events
var model = new bcdui.core.StaticModel({ data: { value: 3 } });
model.execute();
model.onChange( function(m) {
  console.log(m.getData().value);
});
model.getData().value ++;
model.fire(); // console prints '4'

inherited getData(){*}

core/dataProvider.js, line 325
Access to the data of this DataProvider for read and modification access
Returns:
Type Description
* The data provided by the specific sub-class.

inherited abstractgetFailedStatus(){Array.<bcdui.core.Status>}

core/abstractExecutable.js, line 423
Getter for the list of error statuses of this class. This implementation returns an empty list.
Returns:
Type Description
Array.<bcdui.core.Status> The status objects corresponding to failures in the object's process.

inherited getName(){string}

core/dataProvider.js, line 315
Getter for the name of the data provider. This name is for example used to set parameters names of a bcdui.core.TransformationChain.
Returns:
Type Description
string The name of the data provider. This name should be unique within the scope it is used and is usually not globally unique (as the id).

getReadyStatus(){bcdui.core.Status}

core/dataProviders.js, line 318
Returns:
Type Description
bcdui.core.Status Returns the final state indicating the the value is available.

inherited getStatus(){bcdui.core.Status}

core/abstractExecutable.js, line 376
Getter for the status of this object. See bcdui.core.status for possible return values.
Returns:
Type Description
bcdui.core.Status The current status.

inherited hasFailed(){boolean}

core/abstractExecutable.js, line 396
Tests if the object has reached a failure status. These status codes are returned by the "getFailedStatus" method.
Returns:
Type Description
boolean True, if the object's process has failed.

inherited isClean(){boolean}

core/dataProvider.js, line 709
True, if DataProvider is ready and there are no uncommitted write transactions, see isReady() and fire().
Returns:
Type Description
boolean

inherited isReady(){boolean}

core/abstractExecutable.js, line 386
Tests if the current state is the readyStatus. This status is the same status as returned by "getReadyStatus".
Returns:
Type Description
boolean True, if the object is ready.

inherited onceReady(listenerObject)

core/abstractExecutable.js, line 561
Name Type Description
listenerObject function | OnceReadyParam Either a function to be called on ready status (i.e. onSuccess) or a parameter map OnceReadyParam. To listen for other states see addStatusListener()
Example
myModel.onceReady({onSuccess: myCallback, executeIfNotReady: true})

inherited onChange(listenerObject, trackingXPath)

core/dataProvider.js, line 563
Name Type Description
listenerObject function | OnChangeParam Either a function to be called after changes or a parameter map OnChangeParam. Listeners can be removed with removeDataListener()
trackingXPath string optional xPath to monitor to monitor for changes

inherited onReady(listenerObject)

core/abstractExecutable.js, line 595
Name Type Description
listenerObject function | OnReadyParam Either a function to be called on ready status (i.e. onSuccess) or a parameter map OnReadyParam. To listen for other states see addStatusListener()
Example
myModel.onReady({onSuccess: function(){ console.log("ready") }, executeIfNotReady: true, onlyFuture: true})

inherited promptData()

core/dataProvider.js, line 334
Convenience method for debugging showing data in a prompt for copy-and-paste

query(xPath)

core/dataProviders.js, line 277
Reads a single node from a given xPath
Name Type Description
xPath string xPath to query
Returns:
single node or null if query fails or source isn't set yet

queryNodes(xPath)

core/dataProviders.js, line 290
Get node list from a given xPath
Name Type Description
xPath string xPath to query
Returns:
node list or empty list if query fails or source isn't set yet

read(xPath, fillParams, defaultValue)

core/dataProviders.js, line 225
Reads value from a given xPath (or optionally return default value)
Name Type Description
xPath string xPath pointing to value
fillParams Object optional array or object holding the values for the dot placeholders in the xpath. Values with "'" get 'escaped' with a concat operation to avoid bad xpath expressions
defaultValue string optional default value in case xPath value does not exist
Returns:
text value stored at xPath (or null if nothing found and no defaultValue supplied or when source isn't set yet)

remove(xPath, fillParams, fire)

core/dataProviders.js, line 266
removes given xPath
Name Type Default Description
xPath string xPath pointing to value
fillParams Object optional array or object holding the values for the dot placeholders in the xpath. Values with "'" get 'escaped' with a concat operation to avoid bad xpath expressions
fire boolean false optional if true a fire is triggered to notify data modification listener

inherited removeDataListener(listenerObject)

core/dataProvider.js, line 525
Name Type Description
listenerObject string | function | RemoveDataListenerParam Either a listener function or id or a parameter map RemoveDataListenerParam. Listeners are added with onChange()

inherited removeStatusListener(args)

core/abstractExecutable.js, line 239
Name Type Description
args function | StatusListener | RemoveStatusListenerParam The listener to be removed. This can either be a function or a StatusListener or a parameter map RemoveStatusListenerParam.

inherited sendData()

core/dataProvider.js, line 158
Sends the current data to the original URL

inherited serialize()

core/dataProvider.js, line 509
Serialize dataprovider's data if available
Returns:
String containing the serialized data

setSource()

core/dataProviders.js, line 341
Set the underlying source delayed instead of via the constructor. The DataProviderHolder does only become ready after the source was set and is or becomes ready.

inherited setStatus(args)

core/dataProvider.js, line 693
Name Type Description
args Status

toString(){string}

core/dataProviders.js, line 333
Returns:
Type Description
string Human readable summary of this class.

write(xPath, fillParams, value, fire)

core/dataProviders.js, line 252
Set a value to on a certain xPath and create the xPath where necessary. This combines Element.evaluate() for a single node with creating the path where necessary. It will prefer extending an existing start-part over creating a second one. After the operation the xPath (with the optional value) is guaranteed to exist (pre-existing or created or extended) and the addressed node is returned.
Name Type Default Description
xPath string xPath pointing to the node which is set to the value value or plain xPath to be created if not there. It tries to reuse all matching parts that are already there. If you provide for example "/n:Root/n:MyElem/@attr1" and there is already "/n:Root/n:MyElem@attr1", then ""/n:Root/n:MyElem" will be "re-used" and get a second attribute attr1. Many expressions are allowed, for example "/n:Root/n:MyElem[@attr1='attr1Value']/n:SubElem" is also ok. By nature, some xPath expressions are not allowed, for example using '//' or "/n:Root/n:MyElem/[@attr1 or @attr2]/n:SubElem" is obviously not unambiguous enough and will throw an error. This method is Wrs aware, use for example '/wrs:Wrs/wrs:Data/wrs:*[2]/wrs:C[3]' as xPath and it will turn wrs:R[wrs:C] into wrs:M[wrs:C and wrs:O], see Wrs format.
fillParams Object optional array or object holding the values for the dot placeholders in the xpath. Values with "'" get 'escaped' with a concat operation to avoid bad xpath expressions
value string optional Optional value which should be written, for example to "/n:Root/n:MyElem/@attr" or with "/n:Root/n:MyElem" as the element's text content. If not provided, the xPath contains all values like in "/n:Root/n:MyElem[@attr='a' and @attr1='b']" or needs none like "/n:Root/n:MyElem"
fire boolean false optional If true a fire is triggered to inform data modification listeners
Returns:
The xPath's node (can be null if source isn't set yet or dataProvider isn't ready)