package com.jclark.xsl.dom;

import com.jclark.xsl.om.*;

class ElementNode extends ContainerNode {
  private Name name;
  private AttributeNode[] attributeNodes = null;

  ElementNode(org.w3c.dom.Node domNode, ContainerNode parent, int childIndex) {
    super(domNode, parent, childIndex);
    org.w3c.dom.NamedNodeMap domAttributes = domNode.getAttributes();
    int len = domAttributes.getLength();
    if (len == 0)
      return;
    attributeNodes = new AttributeNode[len];
    int firstPrefixIndex = -1;
    for (int i = 0; i < len; i++) {
      org.w3c.dom.Node domAttribute = domAttributes.item(i);
      String qName = domAttribute.getNodeName();
      switch (qName.indexOf(':')) {
      case -1:
	if (qName.equals("xmlns")) {
	  String uri = domAttribute.getNodeValue();
	  if (uri.length() == 0)
	    prefixMap = prefixMap.unbindDefault();
	  else
	    prefixMap = prefixMap.bindDefault(uri);
	}
	else
	  attributeNodes[i] = new AttributeNode(root.nameTable.createName(domAttribute.getNodeName()),
						domAttribute,
						this,
						// attributes occur before children
						i - len - 1);
	break;
      case 3:
	if (qName.equals("xml:space")) {
	  String value = domAttribute.getNodeValue();
	  if ("preserve".equals(value))
	    preserveSpace = true;
	  else if ("default".equals(value))
	    preserveSpace = false;
	}
	if (firstPrefixIndex < 0)
	  firstPrefixIndex = i;
	break;
      case 5:
	if (qName.startsWith("xmlns")) {
	  prefixMap = prefixMap.bind(qName.substring(6),
				     domAttribute.getNodeValue());
	  break;
	}
	// fall through
      default:
	if (firstPrefixIndex < 0)
	  firstPrefixIndex = i;
	break;
      }
    }
    if (firstPrefixIndex >= 0) {
      // global attributes are hopefully relatively rare
      for (int i = firstPrefixIndex; i < len; i++) {
	if (attributeNodes[i] == null) {
	  org.w3c.dom.Node domAttribute = domAttributes.item(i);
	  String qName = domAttribute.getNodeName();
	  if (qName.startsWith("xmlns")
	      && (qName.length() == 5 || qName.charAt(5) == ':'))
	    ;
	  else {
	    try {
	      attributeNodes[i]
		= new AttributeNode(prefixMap.expandAttributeName(domAttribute.getNodeName(),
								  null),
				    domAttribute,
				    this,
				    // attributes occur before children
				    i - len - 1);
	    }
	    catch (XSLException e) { }
	  }
	}
      }
    }
  }


  public byte getType() {
    return ELEMENT;
  }

  public Name getName() {
    if (name == null) {
      String qName = domNode.getNodeName();
      try {
	name = prefixMap.expandElementTypeName(qName, null);
      }
      catch (XSLException e) {
	name = root.nameTable.createName(qName);
      }
    }
    return name;
  }

  public String getAttributeValue(Name name) {
    if (attributeNodes == null)
      return null;
    for (int i = 0; i < attributeNodes.length; i++)
      if (attributeNodes[i] != null && name.equals(attributeNodes[i].name))
	return attributeNodes[i].getData();
    return null;
  }

  public Node getAttribute(Name name) {
    if (attributeNodes == null)
      return null;
    for (int i = 0; i < attributeNodes.length; i++)
      if (attributeNodes[i] != null && name.equals(attributeNodes[i].name))
	return attributeNodes[i];
    return null;
  }

  class AttributesIterator implements SafeNodeIterator {
    int i = 0;
    public Node next() {
      while (i < attributeNodes.length) {
	Node attributeNode = attributeNodes[i++];
	if (attributeNode != null)
	  return attributeNode;
      }
      return null;
    }
  }

  public SafeNodeIterator getAttributes() {
    if (attributeNodes == null)
      return NullNodeIterator.getInstance();
    return new AttributesIterator();
  }

  public boolean getPreserveSpace() {
    return preserveSpace || !root.loadContext.getStripSource(getName());
  }
}