Java XML Element Get by ID getElementById(Document doc, String id, Map idMap)

Description

get Element By Id

License

LGPL

Declaration

static Node getElementById(Document doc, String id, Map<String, Node> idMap) 

Method Source Code

//package com.java2s;
//License from project: LGPL 

import java.util.Map;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

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

public class Main {
    static Node getElementById(Document doc, String id, Map<String, Node> idMap) {
        if (!idMap.containsKey(id)) {
            registerIDs(doc, doc.getDocumentElement(), idMap);
        }//from w w w  . ja  va 2  s.  c  o  m
        return idMap.get(id);
    }

    private static void registerIDs(Document doc, Node node, Map<String, Node> idMap) {
        if (node.getNodeType() == Node.ELEMENT_NODE) {
            if (node.getAttributes().getNamedItem("id") != null) {
                final String id = node.getAttributes().getNamedItem("id").getNodeValue();
                idMap.put(id, (Element) node);
            }
        }
        NodeList children = node.getChildNodes();
        for (int i = 0; i < children.getLength(); i++) {
            registerIDs(doc, children.item(i), idMap);
        }

    }
}

Related

1. getElemenById(Document document, String elementId)
2. getElementById(Document document, String id)
3. getElementById(Document dom, String id)
4. getElementById(Document dom, String id, String localElementName)