The following node is available in the Open Source KNIME predictive analytics and data mining platform version 2.7.1. Discover over 1000 other nodes, as well as enterprise functionality at
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Java Snippet Row Splitter
Java Snippet based Row Splitter. Use the java editor to enter a
boolean expression that is used to define whether an input row
is passed to the first (true) or second (false)
output. For instance, to filter for every other row, you could use
an expression such as
return $$ROWINDEX$$ % 2 == 0;
This node supports missing values. If the corresponding check box
is set missing values are represented as null values.
If the check box is not set and the snippet accesses a field whose
value is missing, the expression evaluates to false
(no match). It also evaluates to false in case the
snippet throws an exception (other than Abort).
You can halt the entire execution by throwing an Abort
exception such as throw new Abort(message);.
Dialog Options
- Column List
-
The list contains the column that are available in the input table.
Double click any of the column names to insert the respective field
in the expression editor. It will replace your current selection or
simply insert at the current caret position.
- Flow Variable List
-
The list contains the flow variables that are currently available at
the node input. Double clicking any of the entries will insert the
respective identifier at the current cursor position (replacing the
selection, if any).
- Global Variable Declaration
-
Define global variables here. These variables are available during
the execution and they are also modifiable. Names starting with '_'
(underscore) are discouraged due to potential name conflicts with
internally used variables.
- Method Body
-
Enter your java code here (the entire source will be wrapped in a
method). You can add the name of a variables
by double-clicking its name in the left list. Note that numeric
(double-compatible) variables will be handled as Double,
int-compatible variables as Integer and any other varaible
type as String.
- Insert Missing As Null
-
If selected, missing values in the input table will be represented
by null in the expression. It is your responsibility to check
for null in this case (the fields are all real classes,
so even int and double are represented as their
respective class Integer and Double). If unselected,
a missing value in the relevant input cell will immediately produce
a false match.
- Compile on close
-
If unchecked, the syntax test is skipped when the settings are
applied to the model, allowing the dialog to close even if there are
syntax errors encountered. This enables the user to temporarily close
the dialog, investigate the input table and then return to the
almost-complete-and-running snippet code in the dialog. The node will
not be executable (it will be red) if the code contains syntax errors.
This option is only for convenience, it does not have any effect on
the output of this node.
Ports
Input Ports
0 |
Input data to be split. |
Output Ports
0 |
Input data for which the expression
evaluated to true.
|
1 |
Input data for which the expression evaluated to true.
|
This node is contained in KNIME JavaScripting node
provided by KNIME GmbH, Konstanz, Germany.