cms/gcr/xml/ElementIterator.java

   1 package org.argeo.cms.gcr.xml;
   2
   3 import java.util.Iterator;
   4 import java.util.NoSuchElementException;
   5
   6 import org.argeo.api.gcr.Content;
   7 import org.w3c.dom.Element;
   8 import org.w3c.dom.Node;
   9 import org.w3c.dom.NodeList;
  10
  11 public class ElementIterator implements Iterator<Content> {
  12         private final DomContentSession contentSession;
  13         private final NodeList nodeList;
  14
  15         private int currentIndex;
  16         private final int length;
  17         private Element nextElement = null;
  18
  19         public ElementIterator(DomContentSession contentSession, NodeList nodeList) {
  20                 this.contentSession = contentSession;
  21                 this.nodeList = nodeList;
  22
  23                 this.length = nodeList.getLength();
  24                 this.currentIndex = 0;
  25                 this.nextElement = findNext();
  26         }
  27
  28         private Element findNext() {
  29                 while (currentIndex < length) {
  30                         Node node = nodeList.item(currentIndex);
  31                         if (node instanceof Element) {
  32                                 return (Element) node;
  33                         }
  34                         currentIndex++;
  35                 }
  36                 return null;
  37         }
  38
  39         @Override
  40         public boolean hasNext() {
  41                 return nextElement != null;
  42         }
  43
  44         @Override
  45         public Content next() {
  46                 if (nextElement == null)
  47                         throw new NoSuchElementException();
  48                 DomContent result = new DomContent(contentSession, nextElement);
  49                 currentIndex++;
  50                 nextElement = findNext();
  51                 return result;
  52         }
  53
  54 }