9.4 Node Collections

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9.4 Node Collections

The interface NodeList offers features for handling ordered lists. The following methods offer methods for accessing members of the lists.
- int getLength()
- Node item(int index)
The interface NamedNodeMap serves a similar purpose for associative tables. It offers the following methods for accessing members.
- Node getNamedItem(String name)
- Node getNamedItemNS(String namespaceURI, String localName)
- int getLength()
- Node item(int index)
The Node interface introduces the following methods for retrieving collections of nodes:
- NodeList getChildNodes()
- NamedNodeMap getAttributes()
The Attribute nodes are not included as children in the DOM hierarchy.

<..DOM extended tree traverser ..>

class TreeTraverser{
     static String indent="";
   TreeTraverser (Node node){
     String s = node.getNodeValue();
     System.out.println( indent + node.getNodeName()
                 + " <<" + (s==null? "null" : s.trim()) + ">>");
     int i;
     indent += "  ";
     if( node.hasAttributes() ){
        System.out.println( indent + "ATTRIBUTES:" );
        NamedNodeMap attributes = node.getAttributes()   ;
        for( i=0; i < attributes.getLength(); i++ ){
           new TreeTraverser ( attributes.item(i) );
     } }
     if( node.hasChildNodes() ){
        System.out.println( indent + "CHILDREN:" );
        NodeList children = node.getChildNodes();
        for( i=0; i < children.getLength(); i++ ){
           new TreeTraverser ( children.item(i) );
     } }
     indent = indent.substring(2);
} }

-_-_-

<?xml version="1.0" encoding="UTF-8"?>
<root xmlns="x:y" attr="ignored">
  <section>
    A & B
  </section>
</root>

#document <<null>>
  CHILDREN:
  root <<null>>
    ATTRIBUTES:
    xmlns <<x:y>>
    attr <<ignored>>
    CHILDREN:
    #text <<>>
    section <<null>>
      CHILDREN:
      #text <<A & B>>
    #text <<>>

Note. The attributes are not listed!

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