Usage
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Final classes in JET
Classes in JET are generally final and do not support subclassing. At the moment, final is not enforced. However, this will likely change in an upcoming JET release.
Constructor
new EmptyNodeSet(parent, start)
Convenient class that represents an empty node set
Parameters:
| Name | Type | Description |
|---|---|---|
parent |
any | the parent key |
start |
number | the start index |
Methods
-
getCount : {number}
-
Gets the actual count of the result set.
Returns:
the actual count of the result set.
- Type
- number
-
getData(index) : {null}
-
Gets the data of the specified index. An error is throw when 1) the range is not yet available and 2) the index specified is out of bounds.
Parameters:
Name Type Description indexnumber the index of the node/row in which we want to retrieve the data from. Returns:
the data for the specified index.
- Type
- null
-
getMetadata(index) : {null}
-
Gets the metadata of the specified index. An error is throw when 1) the range is not yet available and 2) the index specified is out of bounds. The metadata that the data source must return are: 1) key - Object, the key of the node/row. 2) state - state of the node, valid values are 'expanded', 'collapsed', 'leaf'. 3) depth - number, the depth of the node/row.
Parameters:
Name Type Description indexnumber the index of the node/row in which we want to retrieve the metadata from. Returns:
the metadata object for the specific index.
- Type
- null
-
getParent : {any}
-
Gets the parent
Returns:
the key of the parent.
- Type
- any
-
getStart : {number}
-
Gets the start index of the result set.
Returns:
the start index of the result set.
- Type
- number