Wii U Game Id Parser

import org.w3c.dom.Document;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.File;
import java.io.IOException;

public class GameDataParser
{
    private Document document;

    public GameDataParser(String metaXMLFilePath) throws ParserConfigurationException, IOException, SAXException
    {
        File metaXMLFile = new File(metaXMLFilePath);
        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
        document = documentBuilder.parse(metaXMLFile);
    }

    public String getGameId() throws IOException, SAXException, ParserConfigurationException
    {
        String productCode = getProductCode();
        String companyCode = getCompanyCode();

        return productCode + companyCode;
    }

    private String getProductCode()
    {
        return getText("product_code", 6);
    }

    private String getCompanyCode()
    {
        return getText("company_code", 2);
    }

    private String getText(String tagName, int beginIndex)
    {
        return document.getElementsByTagName(tagName).item(0).getTextContent().substring(beginIndex);
    }
}