transform-function-factory-java.md

The TransformFunctionFactory API provides the following methods for extension by subclasses:

public abstract TransformFunction createTransformFunction(ServerInterface srvInterface);

public abstract void getPrototype(ServerInterface srvInterface, ColumnTypes argTypes, ColumnTypes returnType);

public abstract void getReturnType(ServerInterface srvInterface, SizedColumnTypes argTypes,
        SizedColumnTypes returnType) throws UdfException;

public void getParameterType(ServerInterface srvInterface, SizedColumnTypes parameterTypes);