Problem
I need to access attribute key of QName instance , to know this name related to element or to attribute.
Solution
I have created class based on Proxy methods, to do this.
Detailed explanation
QName instance received from XML attribute has the same properties as QName instance received from XML element and you can't know by this two is it from element or from attribute. But if you will pass it back to XML element it will return correct node even if it will have attribute and element with the same name inside.
var xml:XML = <root node="attribute">
<node><![CDATA[element]]</node>
</root>;
var name:QName = xml.@node.name();
trace(name); // node
trace(xml[name]); // attribute
var name:QName = xml.node.name();
trace(name); // node
trace(xml[name]); // element
As you can see, no difference outside and some difference inside. QName instance has some invisible key that contains isAttribute/isElement value. Before I used separated collections and wrapper objects to save this value, but some time ago I remembered that Proxy class has
flash_proxy::isAttribute method, that can get this value for me. And I created new class especially for this purposes - to GET and SET this value. It is called aw.utils.QNameUtils and very simple to use it:
var xml:XML = <root node="attribute">
<node><![CDATA[element]]>
</node>
</root>;
var name:QName = xml.@node.name();
trace(name); // node
trace(xml[name]); // attribute
trace(QNameUtils.isAttribute(name)); // true
name = QNameUtils.setAttribute(name, false);
trace(xml[name]); // element
var name:QName = xml.node.name();
trace(name); // node
trace(xml[name]); // element
trace(QNameUtils.isAttribute(name)); // false
name = QNameUtils.setAttribute(name, true);
trace(xml[name]); // attribute
name = QNameUtils.create('', 'node', true)
trace(xml[name]); // attribute
Methods of this class:
- isAttribute(name:*):Boolean - Get attribute key value
- setAttribute(name:*, isAttribute:Boolean=true):QName - Set attribute key value
- parse(value:String):QName - Create QName intance from string
- create(uri:*=null, localName:*=null, attribute:Boolean=false):QName - Create QName instance
You can download it as ZIP package.
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