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EXAMPLE: COPYING INPUTS

This section presents a simple example of the steps needed to create a

new node. We will create a node that simply copies data from its

inputs to its outputs. While the computation involved is trivial, this

will show what’s involved in creating a node.

We begin with an implementation involving no parameters and

written completely in Java. Later extensions include computation

performed in C++ and a dialog to pass parameters.

For all of the examples presented here, the full code is available in the

examples/programming directory.

Simple Java

Version

For the first implementation, we will use a minimal set of Java classes.

Recall that typically we will need to implement a class extending

ActivityNodeModel to handle GUI operations, a class extending

EngineNode to handle engine operations, and possibly other classes

for the properties dialog and custom viewer.

Node Model To keep things simple we will not include a properties dialog or

custom viewer. As there are no parameters, we do not need to

validate whether all of the properties are set. In this case we can use

the default implementation of

ActivityNodeModel.

Engine Node The Java implementation of the engine node will primarily need

computation-specific code for computing the output column name

and type information (the output metadata) and for actually copying

the data when the node is executed. In addition, there will be some

essentially boilerplate code.

We start with a simple implementation of the

execute() and

calculateOutputMetaData() methods. Later we will provide more

extensive implementations.

Implementation

The file

FirstCopyEngineNode.java contains:

import com.insightful.miner.*;

import com.insightful.cnkjava.*;

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EDOBE XDOM PMML Manual de usuario Pagina 28