public class CSVWriterNodeModel extends NodeModel
|Modifier and Type||Field and Description|
Identifier for StringHistory.
|Constructor and Description|
Constructor, sets port count.
|Modifier and Type||Method and Description|
This function is called whenever the derived model should re-configure and generate the expected output specs.
Streaming API (pending): Factory method for a streamable operator that is used to execute this node.
This function is invoked by the
Streaming API (pending): Defines properties on the input ports when used in a streamed and/or distributed fashion.
Creates an URL from the "file"name entered in the dialog.
Load internals into the derived
Sets new settings from the passed object in the model.
Save internals of the derived
Adds to the given
Validates the settings in the passed
addWarningListener, computeFinalOutputSpecs, configure, continueLoop, createInitialStreamableOperatorInternals, createMergeOperator, execute, finishStreamableExecution, getAvailableFlowVariables, getAvailableInputFlowVariables, getCredentialsProvider, getInHiLiteHandler, getInPortType, getInteractiveNodeView, getLogger, getLoopEndNode, getLoopStartNode, getNrInPorts, getNrOutPorts, getOutHiLiteHandler, getOutPortType, getOutputPortRoles, getWarningMessage, iterate, notifyViews, notifyWarningListeners, onDispose, peekFlowVariableDouble, peekFlowVariableInt, peekFlowVariableString, pushFlowVariableDouble, pushFlowVariableInt, pushFlowVariableString, removeWarningListener, resetAndConfigureLoopBody, setInHiLiteHandler, setWarningMessage, stateChanged
protected void saveSettingsTo(NodeSettingsWO settings)
NodeSettingsthe model specific settings. The settings don't need to be complete or consistent. If, right after startup, no valid settings are available this method can write either nothing or invalid settings.
Method is called by the
Node if the current settings need
to be saved or transfered to the node's dialog.
settings- The object to write settings into.
public InputPortRole getInputPortRoles()
A data input is streamed when the node implementation only needs to see
each data record once (no iterative access), otherwise it's non-streamed.
If a port is streamed the
StreamableOperator.runFinal(PortInput, PortOutput, ExecutionContext)
method will provide the input as a
RowInput object, to which the
client implementation can safely type-cast to. For non-streamed ports the
input is represented by an instance of
BufferedDataTable) are always non-streamed.
An data input may be distributable (= parallelizable), in which case the data is processed in paralleled (possibly scattered in the cloud). Non-data ports are always non-distributable (but the execution may still take place in a distributed fashion if another port is distributed -- any non-distributable port is then simply duplicated as required).
protected void validateSettings(NodeSettingsRO settings) throws InvalidSettingsException
NodeSettingsobject. The specified settings should be checked for completeness and consistency. It must be possible to load a settings object validated here without any exception in the
#loadValidatedSettings(NodeSettings)method. The method must not change the current settings in the model - it is supposed to just check them. If some settings are missing, invalid, inconsistent, or just not right throw an exception with a message useful to the user.
settings- The settings to validate.
InvalidSettingsException- If the validation of the settings failed.
protected void loadValidatedSettingsFrom(NodeSettingsRO settings) throws InvalidSettingsException
#validateSettings(NodeSettings)method. The model must set its internal configuration according to the settings object passed.
public StreamableOperator createStreamableOperator(PartitionInfo partitionInfo, PortObjectSpec inSpecs) throws InvalidSettingsException
NodeModel.execute(PortObject, ExecutionContext)method. Subclasses may override it to return a new operator that follows the data handling described by the
This method is called by the node executor once or multiple times depending on the input roles. If any input is distributable, the method is called multiple times (for each partition once), possibly on different (remote) clones of this NodeModel.
partitionInfo- The partition info describing the chunk (if distributable).
inSpecs- The port object specs of the input ports. These are identical to the specs that
NodeModel.configure(PortObjectSpec)was last called with (also on the remote side).
InvalidSettingsException- Usually not thrown in the client but still part of the method signature as implementations often run the same methods as during configure. (This method is not being called when configure fails.)
protected BufferedDataTable execute(BufferedDataTable data, ExecutionContext exec) throws Exception
Node#executeNode()method of the node (through the
#executeModel(BufferedDataTable,ExecutionMonitor)method) only after all predecessor nodes have been successfully executed and all data is therefore available at the input ports. Implement this function with your task in the derived model.
The input data is available in the given array argument
inData and is ensured to be neither
null nor contain
null elements (with few non-standard exception, which are described in
more detail in
In order to create output data, you need to create objects of class
BufferedDataTable. Use the
execution context argument to create
data- An array holding
DataTableelements, one for each input.
exec- The execution monitor for this execute method. It provides us with means to create new
BufferedDataTable. Additionally, it should be asked frequently if the execution should be interrupted and throws an exception then. This exception might me caught, and then after closing all data streams, been thrown again. Also, if you can tell the progress of your task, just set it in this monitor.
nullDataTable elements with the size of the number of outputs. The result of this execution.
Exception- If you must fail the execution. Try to provide a meaningful error message in the exception as it will be displayed to the user.Please be advised to check frequently the canceled status by invoking
ExecutionMonitor#checkCanceledwhich will throw an
CanceledExcecutionExceptionand abort the execution.
protected void reset()
protected void loadInternals(File nodeInternDir, ExecutionMonitor exec) throws IOException, CanceledExecutionException
NodeModel. This method is only called if the
Nodewas executed. Read all your internal structures from the given file directory to create your internal data structure which is necessary to provide all node functionalities after the workflow is loaded, e.g. view content and/or hilite mapping.
nodeInternDir- The directory to read from.
exec- Used to report progress and to cancel the load process.
IOException- If an error occurs during reading from this dir.
CanceledExecutionException- If the loading has been canceled.
protected void saveInternals(File nodeInternDir, ExecutionMonitor exec) throws IOException, CanceledExecutionException
NodeModel. This method is only called if the
Nodeis executed. Write all your internal structures into the given file directory which are necessary to recreate this model when the workflow is loaded, e.g. view content and/or hilite mapping.
nodeInternDir- The directory to write into.
exec- Used to report progress and to cancel the save process.
IOException- If an error occurs during writing to this dir.
CanceledExecutionException- If the saving has been canceled.
protected DataTableSpec configure(DataTableSpec inSpecs) throws InvalidSettingsException
For ordinary(*) nodes the passed DataTableSpec elements are never
null but can be empty. The model
null data table spec(s) for the outputs. Note, after the model has been executed this
function will not be called anymore, as the output DataTableSpecs are then being pulled from the output
DataTables. A derived
NodeModel that cannot provide any DataTableSpecs at its outputs before
execution (because the table structure is unknown at this point) can return an array containing just
null elements. As an example consider a "Transpose" node that flips columns to rows -- there is no
way to determine the table spec at time of configuration as the number of rows (which is the number of new
columns at the output) is unknown though the node is still executable.
(*)For nodes that support optional inputs or may have inactive outputs it's better to override
Implementation note: This method is called from the
NodeModel.configure(PortObjectSpec) method unless that
method is overwritten.
inSpecs- The input data table specs (as many as this model has inputs). Do NOT modify the contents of this array. If no spec is available for any given port (because the port is not connected or the previous node does not produce a spec) the framework will pass an empty
DataTableSpec(no columns) unless the port is marked as
optional(in which case the array element is null).
nullDataTableSpec elements are changed to empty once.
InvalidSettingsException- if the
#configure()failed, that is, the settings are inconsistent with given DataTableSpec elements.
static boolean notEmpty(String s)
s- the String to test
static boolean isEmpty(String s)
s- the String to test
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