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java.lang.Objectorg.knime.core.node.NodeModel
org.knime.base.node.preproc.valcount.ValueCounterNodeModel
public class ValueCounterNodeModel
This is the model for the value counter node that does all the work.
Constructor Summary | |
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ValueCounterNodeModel()
Creates a new value counter model. |
Method Summary | |
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protected DataTableSpec[] |
configure(DataTableSpec[] inSpecs)
This function is called whenever the derived model should re-configure its output DataTableSpecs. |
protected BufferedDataTable[] |
execute(BufferedDataTable[] inData,
ExecutionContext exec)
This function is invoked by the 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. |
protected HiLiteHandler |
getOutHiLiteHandler(int outIndex)
Returns the HiLiteHandler for the given output index. |
protected void |
loadInternals(File nodeInternDir,
ExecutionMonitor exec)
Load internals into the derived NodeModel . |
protected void |
loadValidatedSettingsFrom(NodeSettingsRO settings)
Sets new settings from the passed object in the model. |
protected void |
reset()
Override this function in the derived model and reset your NodeModel . |
protected void |
saveInternals(File nodeInternDir,
ExecutionMonitor exec)
Save internals of the derived NodeModel . |
protected void |
saveSettingsTo(NodeSettingsWO settings)
Adds to the given NodeSettings the model specific
settings. |
protected void |
setInHiLiteHandler(int inIndex,
HiLiteHandler hiLiteHdl)
This implementation is empty. |
protected void |
validateSettings(NodeSettingsRO settings)
Validates the settings in the passed NodeSettings object. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ValueCounterNodeModel()
Method Detail |
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protected DataTableSpec[] configure(DataTableSpec[] inSpecs) throws InvalidSettingsException
The passed DataTableSpec elements are never null
but can
be empty. The model may return null
data table spec(s) for
the outputs. But still, the model may be in an executable state. 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.
Implementation note: This method is called from the
NodeModel.configure(PortObjectSpec[])
method unless that method is
overwritten.
configure
in class NodeModel
inSpecs
- An array of DataTableSpecs (as many as this model has
inputs). Do NOT modify the contents of this array. None of the
DataTableSpecs in the array can be null
but
empty. If the predecessor node is not yet connected, or
doesn't provide a DataTableSpecs at its output port.
null
DataTableSpec elements are changed to empty
once.
InvalidSettingsException
- if the #configure()
failed, that is, the settings are inconsistent with given
DataTableSpec elements.protected BufferedDataTable[] execute(BufferedDataTable[] inData, 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.
In order to create output data, you need to create objects of class
BufferedDataTable
. Use the execution context argument to
create BufferedDataTable
.
execute
in class NodeModel
inData
- An array holding DataTable
elements, 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.
null
DataTable 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#checkCanceled
which will
throw an CanceledExcecutionException
and abort
the execution.protected void loadInternals(File nodeInternDir, ExecutionMonitor exec) throws IOException, CanceledExecutionException
NodeModel
. This method is
only called if the Node
was 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.
loadInternals
in class NodeModel
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.NodeModel.saveInternals(File,ExecutionMonitor)
protected void loadValidatedSettingsFrom(NodeSettingsRO settings) throws InvalidSettingsException
#validateSettings(NodeSettings)
method. The model must set
its internal configuration according to the settings object passed.
loadValidatedSettingsFrom
in class NodeModel
settings
- The settings to read.
InvalidSettingsException
- If a property is not available.NodeModel.saveSettingsTo(NodeSettingsWO)
,
NodeModel.validateSettings(NodeSettingsRO)
protected void reset()
NodeModel
. All components should unregister themselves
from any observables (at least from the hilite handler right now). All
internally stored data structures should be released. User settings
should not be deleted/reset though.
reset
in class NodeModel
protected void saveInternals(File nodeInternDir, ExecutionMonitor exec) throws IOException, CanceledExecutionException
NodeModel
. This method is
only called if the Node
is 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.
saveInternals
in class NodeModel
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.NodeModel.loadInternals(File,ExecutionMonitor)
protected void saveSettingsTo(NodeSettingsWO settings)
NodeSettings
the 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.
saveSettingsTo
in class NodeModel
settings
- The object to write settings into.NodeModel.loadValidatedSettingsFrom(NodeSettingsRO)
,
NodeModel.validateSettings(NodeSettingsRO)
protected void validateSettings(NodeSettingsRO settings) throws InvalidSettingsException
NodeSettings
object.
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.
validateSettings
in class NodeModel
settings
- The settings to validate.
InvalidSettingsException
- If the validation of the settings
failed.NodeModel.saveSettingsTo(NodeSettingsWO)
,
NodeModel.loadValidatedSettingsFrom(NodeSettingsRO)
protected void setInHiLiteHandler(int inIndex, HiLiteHandler hiLiteHdl)
setInHiLiteHandler
in class NodeModel
inIndex
- The index of the input.hiLiteHdl
- The HiLiteHandler
at input index.
May be null
when not available, i.e. not properly
connected.protected HiLiteHandler getOutHiLiteHandler(int outIndex)
HiLiteHandler
for the given output index. This
default implementation simply passes on the handler of input port 0 or
generates a new one if this node has no inputs.
getOutHiLiteHandler
in class NodeModel
outIndex
- The output index.
HiLiteHandler
for the given output port.
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