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.argeo.api.gcr.spi.ProvidedSession;
   8 import org.w3c.dom.Element;
   9 import org.w3c.dom.Node;
  10 import org.w3c.dom.NodeList;
  11
  12 class ElementIterator implements Iterator<Content> {
  13         private final ProvidedSession session;
  14         private final DomContentProvider provider;
  15         private final NodeList nodeList;
  16
  17         private int currentIndex;
  18         private final int length;
  19         private Element nextElement = null;
  20
  21         public ElementIterator(ProvidedSession session, DomContentProvider provider, NodeList nodeList) {
  22                 this.session = session;
  23                 this.provider = provider;
  24                 this.nodeList = nodeList;
  25
  26                 this.length = nodeList.getLength();
  27                 this.currentIndex = 0;
  28                 this.nextElement = findNext();
  29         }
  30
  31         private Element findNext() {
  32                 while (currentIndex < length) {
  33                         Node node = nodeList.item(currentIndex);
  34                         if (node instanceof Element) {
  35                                 return (Element) node;
  36                         }
  37                         currentIndex++;
  38                 }
  39                 return null;
  40         }
  41
  42         @Override
  43         public boolean hasNext() {
  44                 return nextElement != null;
  45         }
  46
  47         @Override
  48         public Content next() {
  49                 if (nextElement == null)
  50                         throw new NoSuchElementException();
  51                 DomContent result = new DomContent(session, provider, nextElement);
  52                 currentIndex++;
  53                 nextElement = findNext();
  54                 return result;
  55         }
  56
  57 }