Java XML Child Get by Name getChildElement(Element parent, String tagName)

Description

Gets the immediately child element from the parent element.

License

Apache License

Parameter

Parameter	Description
parent	the parent element in the element tree
tagName	the specified tag name

Return

immediately child element of parent element, NULL otherwise

Declaration

public static Element getChildElement(Element parent, String tagName) 

Method Source Code

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

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

import java.util.ArrayList;
import java.util.List;

public class Main {
    /**/*from w ww .  ja  v  a2 s .  c  om*/
     * Gets the immediately child element from the parent element.
     *
     * @param parent
     *          the parent element in the element tree
     * @param tagName
     *          the specified tag name
     * @return immediately child element of parent element, NULL otherwise
     */
    public static Element getChildElement(Element parent, String tagName) {
        List<Element> children = getChildElements(parent, tagName);

        if (children.isEmpty()) {
            return null;
        } else {
            return children.get(0);
        }
    }

    /**
     * Gets the immediately child elements list from the parent element.
     *
     * @param parent
     *          the parent element in the element tree
     * @param tagName
     *          the specified tag name
     * @return the NOT NULL immediately child elements list
     */
    public static List<Element> getChildElements(Element parent, String tagName) {
        NodeList nodes = parent.getElementsByTagName(tagName);
        List<Element> elements = new ArrayList<>();

        for (int i = 0; i < nodes.getLength(); i++) {
            Node node = nodes.item(i);
            if (node instanceof Element && node.getParentNode() == parent) {
                elements.add((Element) node);
            }
        }

        return elements;
    }
}

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