Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import org.w3c.dom.Attr;

import org.w3c.dom.Element;

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

public class Main {
    /**
     * Get the first child element with the given name
     *
     * @param parentElement
     * @param name
     * @return
     */
    public static Node getChildElement(Element parentElement, String name, String... filters) {
        final NodeList nodeList = parentElement.getElementsByTagName(name);

        if (nodeList.getLength() > 0) {
            for (int i = 0; i < nodeList.getLength(); i++) {
                final Node node = (Node) nodeList.item(i);

                if (node instanceof Element && matchesFilters((Element) node, filters)) {
                    return node;
                } else if (node instanceof Attr) {
                    return node;
                }
            }
        }
        return null;
    }

    /**
     * Returns {@code true} if the element matches the filters.
     *
     * @param elem
     * @param filters
     * @return
     */
    private static boolean matchesFilters(Element elem, String... filters) {
        for (String filter : filters) {
            final String attribute = extractFilterName(filter);
            final String value = extractFilterValue(filter);

            if (!elem.getAttribute(attribute).equals(value)) {
                return false;
            }
        }
        return true;
    }

    /**
     * Convenience method to extract name from {@code @fooAttribute="blagh"}
     * style filter.
     *
     * @param filter
     * @return
     */
    private static String extractFilterName(String filter) {
        if (filter.startsWith("@")) {
            return filter.substring(1, filter.indexOf("="));
        } else if (filter.startsWith(".")) {
            // means this element, so return null
            return null;
        } else {
            return filter.substring(0, filter.indexOf("="));
        }
    }

    /**
     * Convenience method to extract value from {@code @fooAttribute="blagh"}
     * style filter.
     *
     * @param filter
     * @return
     */
    private static String extractFilterValue(String filter) {
        return filter.substring(filter.indexOf("=\"") + 2, filter.lastIndexOf("\""));
    }
}