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package com.sun.tools.xjc.reader.dtd.bindinfo;
import java.util.ArrayList;
import java.util.List;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* @author Kohsuke Kawaguchi
*/
public final class DOMUtil {
final static String getAttribute(Element e,String attName) {
if(e.getAttributeNode(attName)==null) return null;
return e.getAttribute(attName);
}
public static String getAttribute(Element e, String nsUri, String local) {
if(e.getAttributeNodeNS(nsUri,local)==null) return null;
return e.getAttributeNS(nsUri,local);
}
public static Element getElement(Element e, String nsUri, String localName) {
NodeList l = e.getChildNodes();
for(int i=0;i<l.getLength();i++) {
Node n = l.item(i);
if(n.getNodeType()==Node.ELEMENT_NODE) {
Element r = (Element)n;
if(equals(r.getLocalName(),localName) && equals(fixNull(r.getNamespaceURI()),nsUri))
return r;
}
}
return null;
}
/**
* Used for defensive string comparisons, as many DOM methods often return null
* depending on how they are created.
*/
private static boolean equals(String a,String b) {
if(a==b) return true;
if(a==null || b==null) return false;
return a.equals(b);
}
/**
* DOM API returns null for the default namespace whereas it should return "".
*/
private static String fixNull(String s) {
if(s==null) return "";
else return s;
}
public static Element getElement(Element e, String localName) {
return getElement(e,"",localName);
}
public static List<Element> getChildElements(Element e) {
List<Element> r = new ArrayList<Element>();
NodeList l = e.getChildNodes();
for(int i=0;i<l.getLength();i++) {
Node n = l.item(i);
if(n.getNodeType()==Node.ELEMENT_NODE)
r.add((Element)n);
}
return r;
}
public static List<Element> getChildElements(Element e,String localName) {
List<Element> r = new ArrayList<Element>();
NodeList l = e.getChildNodes();
for(int i=0;i<l.getLength();i++) {
Node n = l.item(i);
if(n.getNodeType()==Node.ELEMENT_NODE) {
Element c = (Element)n;
if(c.getLocalName().equals(localName))
r.add(c);
}
}
return r;
}
}