Developer Transformation Guide

10.5
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- 10.4.1
- 10.4.0

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Data Type Conversion

A Java transformation converts

Developer tool

data types to Java data types, based on the Java transformation port type.

When a Java transformation reads input rows, it converts input port data types to Java data types.

When a Java transformation writes output rows, it converts Java data types to output port data types.

For example, the following processing occurs for an input port with the integer data type in a Java transformation:

The Java transformation converts the integer data type of the input port to the Java primitive int data type.

In the transformation, the transformation treats the value of the input port as the Java primitive int data type.

When the transformation generates the output row, it converts the Java primitive int data type to the integer data type.

The following table shows how the Java transformation maps

Developer tool

data types to Java primitive and complex data types:

Developer Tool Data Type	Java Data Type
array*	java.util.List
bigint	long
binary	byte[]
date/time	With nanoseconds processing enabled, BigDecimal with nanosecond precision With nanoseconds processing disabled, long with millisecond precision (the number of milliseconds since January 1, 1970 00:00:00.000 GMT)
decimal	With high precision processing disabled, double with precision 15 With high precision processing enabled, BigDecimal
double	double
integer	int
map*	java.util.Map
string	String
struct*	Customized JavaBean class with getters and setters for the struct field elements
text	String
* Supported only on the Spark engine.

In Java, the java.util.List, java.util.Map, String, byte[], and BigDecimal data types are complex data types. The double, int, and long data types are primitive data types.

In the Developer tool, array, struct, and map data types are complex data types.

The Java transformation sets null values in primitive data types to zero. You can use the isNull and the setNull API methods on the

On Input

tab to set null values in the input port to null values in the output port. For an example, see setNull.

The decimal data type maps to BigDecimal when high precision is enabled. BigDecimal cannot be used with some operators, such as the

operator. If the Java code contains an expression that uses a decimal port or a complex port with an element of a decimal data type and the port is used with one of the operators, the Java code fails to compile.

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Developer Transformation Guide

Developer Transformation Guide

Data Type Conversion

Data Type Conversion