DOM

package name.panitz.util.xml;

import java.util.Set;

import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class DOM implements DOMUtil{
  
  public long height(Node n){
    long result = 0;
    NodeList ns = n.getChildNodes();
    for (int i = 0;i<ns.getLength() ;i++){
      result = Math.max(result,height(ns.item(i)));
    }
    return result + 1;
  }
  
  public long height2(Node n){
    return new NodeListSpliterator(n.getChildNodes())
        .parallelStream()
        .reduce(0L
            , (r, child) -> Math.max(r, height2(child))
            , Math::max)
        +1;
  }
  
  public void collectText(Node n, StringBuffer result){
    if (Node.TEXT_NODE == n.getNodeType())
      result.append(n.getNodeValue());
    NodeList ns = n.getChildNodes();
    for (int i = 0;i<ns.getLength() ;i++){
      collectText(ns.item(i),result);
    }    
  }
  public void collectText2(Node n, StringBuffer result){
    if (Node.TEXT_NODE == n.getNodeType())
      result.append(n.getNodeValue());    
    new NodeListSpliterator(n.getChildNodes())
      .stream()
      .forEach(child->collectText2(child,result));
  }

  @Override
  public boolean containsTag(Node n, String tagname) {
    if (n.getNodeType()==Node.ELEMENT_NODE
        && n.getNodeName().equals(tagname)){
      return true;
    }
    NodeList ns = n.getChildNodes();
    for (int i = 0;i<ns.getLength() ;i++){
      if (containsTag(ns.item(i),tagname)) return true;
    }    

    return false;
  }
  
  public boolean containsTag3(Node n, String tagname) {
    return (n.getNodeType()==Node.ELEMENT_NODE
        && n.getNodeName().equals(tagname))
      || new NodeListSpliterator(n.getChildNodes())
         .parallelStream()
         .reduce(false
             ,( r, child)->r||containsTag3(child, tagname)
             ,(x,y)-> x|| y);
  }

  @Override
  public boolean containsTag2(Node n, String tagname) {
    return (n.getNodeType()==Node.ELEMENT_NODE
        && n.getNodeName().equals(tagname))
      || new NodeListSpliterator(n.getChildNodes())
         .parallelStream()
         .anyMatch(x->containsTag2(x,tagname));
  }


  @Override
  public void collectTagnames(Node n, Set<String> result) {
    if (n.getNodeType()==Node.ELEMENT_NODE)result.add(n.getNodeName());
    NodeList ns = n.getChildNodes();
    for (int i = 0;i<ns.getLength() ;i++)
      collectTagnames(ns.item(i), result);        
  }

  @Override
  public void collectTagnames2(Node n, Set<String> result) {
    if (n.getNodeType()==Node.ELEMENT_NODE)result.add(n.getNodeName());
    new NodeListSpliterator(n.getChildNodes())
    .stream()
    .forEach(child->collectTagnames2(child,result));

  }

  @Override
  public long getMaxWIDTHAttributeValue(Node n) {
    long result = 0;
    
    NamedNodeMap attributes = n.getAttributes();
    if (attributes!=null){
      Node a = attributes.getNamedItem("width");
      
      if(a != null
      && !a.getNodeValue().isEmpty()
      && a.getNodeValue()
        .chars()
        .mapToObj(x->(new Boolean(Character.isDigit(x))))
        .reduce(true,(x,y)->x&&y,(x,y)->x&&y)){
        result = Math.max(result, new Long(a.getNodeValue()));
      }
    }
    NodeList ns = n.getChildNodes();
    for (int i = 0;i<ns.getLength() ;i++){
      result = Math.max(getMaxWIDTHAttributeValue(ns.item(i)),result);
    }    

    return result;
  }
}