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The SecureSubmit Java SDK simplifies processing of credit card transactions using Heartland Payment Systems' Portico Payment Gateway

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package com.hps.integrator.infrastructure;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;

public class ElementTree {
    private Document doc;

    public void setDocument(Document doc) {
        this.doc = doc;
    }

    public ElementTree(){
        try {
            this.doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();

        } catch (ParserConfigurationException e) {
            System.out.println(e.getMessage());
        }
    }

    public Element element(String tagName) {
        org.w3c.dom.Element element = doc.createElement(tagName);
        return new Element(doc, element);
    }

    public Element subElement(Element parent, String tagName) {
        org.w3c.dom.Element child = doc.createElement(tagName);
        parent.getElement().appendChild(child);
        return new Element(doc, child);
    }

    public String toString(Element root) {
        doc.appendChild(root.getElement());

        try {
            TransformerFactory tFact = TransformerFactory.newInstance();
            Transformer trans = tFact.newTransformer();

            StringWriter writer = new StringWriter();
            StreamResult result = new StreamResult(writer);
            DOMSource source = new DOMSource(doc);
            trans.transform(source, result);
            return writer.toString();
        } catch (TransformerException e) {
            return e.getMessage();
        } finally {
            doc.removeChild(root.getElement());
        }
    }

    public Element get(String tagName) {
        Node node = doc.getElementsByTagName(tagName).item(0);
        if(node != null) {
            return Element.fromNode(doc, node);
        } return null;
    }

    public static ElementTree parse(String xml) throws HpsException {
        try {
            InputSource is = new InputSource(new StringReader(xml));

            ElementTree rvalue = new ElementTree();
            rvalue.setDocument(DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(is));
            return rvalue;
        } catch(ParserConfigurationException e) {
            throw new HpsException(e.getMessage());
        } catch(SAXException e) {
            throw new HpsException(e.getMessage());
        } catch(IOException e) {
            throw new HpsException(e.getMessage());
        }
    }
}