About this task
Use the following methods in a
JavaCompute node to create
new elements in a message tree:
- createElementAsFirstChild()
- createElementAsLastChild()
- createElementBefore()
- createElementAfter()
The method returns a reference to the newly-created element.
Each method has three overloaded forms:
- createElement...(int type)
- Creates a blank element of the specified type. Valid generic
types are:
- MbElement.TYPE_NAME. This type of element has only a name, for
example an XML element.
- MbElement.TYPE_VALUE. This type of element has only a value, for
example XML text that is not contained in an XML element.
- MbElement.TYPE_NAME_VALUE. This type of element has both a name
and a value, for example an XML attribute.
Specific type values can also be assigned. The meaning of this
type information is dependent on the parser. Element name and value
information must be assigned by using the setName() and setValue()
methods.
- createElement...(int type, String name, Object value)
- Method for setting the name and value of the element at creation
time.
- createElement...(String parserName)
- A special form of createElement...() that is only used to create
top-level parser elements.
This example Java™ code
adds a new chapter element to the XML example given in
Accessing elements in a message tree from a JavaCompute node:
MbElement root = outMessage.getRootElement();
MbElement document = root.getLastChild().getFirstChild();
MbElement chapter2 = document.createElementAsLastChild(MbElement.TYPE_NAME,"Chapter",null);
// add title attribute
MbElement title2 = chapter2.createElementAsFirstChild(MbElement.TYPE_NAME_VALUE,
"title", "Message Flows");
This produces the following XML output:
<document>
<chapter title="Introduction">
Some text.
</chapter>
<chapter title="Message Flows"/>
</document>