Custom Java

In the Graphical Data Mapping editor, you can use the Custom Java transform to enter your own Java code. You can then use the transform properties to select a Java class, and a Java method. The Java class must be available in a Java project in your workspace. You can use the content assist in the Values column to help you assign the required elements of the source schema.

For example, the following Java method could be used in a Custom Java transform that had three input elements, of types a xs:string, xs:decimal and xs:boolean and the output element being a xs:decimal:

	public static BigDecimal calSomething(String memType, BigDecimal stdCost, boolean flag) {
		BigDecimal actualCost = stdCost;
		if (flag & memType.startsWith("gold")) {
			BigDecimal discRate = new BigDecimal(0.9);
			actualCost = actualCost.multiply(discRate);
		}			
		return actualCost;
	}

Mappings between the Schema type, the Java type, and the IBM Integration Bus message assembly type

The following table shows the mappings between the Schema type, the Java type, and the IBM® Integration Bus message assembly type:

Processing arrays and complex types

You can create Custom Java transforms to process input and outputs that are arrays or complex types. These cannot be converted from a Schema type to a defined Java type shown in the previous table.

In IBM Integration Bus, your Java class must use the MbElement class to reference the input or output element. For information about using Java and the MbElement class, see Using Java API classes for Custom Java mapping transforms.