Parse an XML with StAX Java/Groovy

staxParser.groovy

#!/usr/bin/env groovy

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

import java.nio.charset.StandardCharsets;

import java.lang.StringBuilder;

import java.util.concurrent.TimeUnit;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.Attribute;
import javax.xml.stream.events.EndElement;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;


String XML = '''
<CATALOG>
<PLANT>
<COMMON>Bloodroot</COMMON>
<BOTANICAL>Sanguinaria canadensis</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Mostly Shady</LIGHT>
<PRICE>$2.44</PRICE>
<AVAILABILITY>031599</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Columbine</COMMON>
<BOTANICAL>Aquilegia canadensis</BOTANICAL>
<ZONE>3</ZONE>
<LIGHT>Mostly Shady</LIGHT>
<PRICE>$9.37</PRICE>
<AVAILABILITY>030699</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Marsh Marigold</COMMON>
<BOTANICAL>Caltha palustris</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Mostly Sunny</LIGHT>
<PRICE>$6.81</PRICE>
<AVAILABILITY>051799</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Cowslip</COMMON>
<BOTANICAL>Caltha palustris</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Mostly Shady</LIGHT>
<PRICE>$9.90</PRICE>
<AVAILABILITY>030699</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Dutchman's-Breeches</COMMON>
<BOTANICAL>Dicentra cucullaria</BOTANICAL>
<ZONE>3</ZONE>
<LIGHT>Mostly Shady</LIGHT>
<PRICE>$6.44</PRICE>
<AVAILABILITY>012099</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Ginger, Wild</COMMON>
<BOTANICAL>Asarum canadense</BOTANICAL>
<ZONE>3</ZONE>
<LIGHT>Mostly Shady</LIGHT>
<PRICE>$9.03</PRICE>
<AVAILABILITY>041899</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Hepatica</COMMON>
<BOTANICAL>Hepatica americana</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Mostly Shady</LIGHT>
<PRICE>$4.45</PRICE>
<AVAILABILITY>012699</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Liverleaf</COMMON>
<BOTANICAL>Hepatica americana</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Mostly Shady</LIGHT>
<PRICE>$3.99</PRICE>
<AVAILABILITY>010299</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Jack-In-The-Pulpit</COMMON>
<BOTANICAL>Arisaema triphyllum</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Mostly Shady</LIGHT>
<PRICE>$3.23</PRICE>
<AVAILABILITY>020199</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Mayapple</COMMON>
<BOTANICAL>Podophyllum peltatum</BOTANICAL>
<ZONE>3</ZONE>
<LIGHT>Mostly Shady</LIGHT>
<PRICE>$2.98</PRICE>
<AVAILABILITY>060599</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Phlox, Woodland</COMMON>
<BOTANICAL>Phlox divaricata</BOTANICAL>
<ZONE>3</ZONE>
<LIGHT>Sun or Shade</LIGHT>
<PRICE>$2.80</PRICE>
<AVAILABILITY>012299</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Phlox, Blue</COMMON>
<BOTANICAL>Phlox divaricata</BOTANICAL>
<ZONE>3</ZONE>
<LIGHT>Sun or Shade</LIGHT>
<PRICE>$5.59</PRICE>
<AVAILABILITY>021699</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Spring-Beauty</COMMON>
<BOTANICAL>Claytonia Virginica</BOTANICAL>
<ZONE>7</ZONE>
<LIGHT>Mostly Shady</LIGHT>
<PRICE>$6.59</PRICE>
<AVAILABILITY>020199</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Trillium</COMMON>
<BOTANICAL>Trillium grandiflorum</BOTANICAL>
<ZONE>5</ZONE>
<LIGHT>Sun or Shade</LIGHT>
<PRICE>$3.90</PRICE>
<AVAILABILITY>042999</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Wake Robin</COMMON>
<BOTANICAL>Trillium grandiflorum</BOTANICAL>
<ZONE>5</ZONE>
<LIGHT>Sun or Shade</LIGHT>
<PRICE>$3.20</PRICE>
<AVAILABILITY>022199</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Violet, Dog-Tooth</COMMON>
<BOTANICAL>Erythronium americanum</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Shade</LIGHT>
<PRICE>$9.04</PRICE>
<AVAILABILITY>020199</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Trout Lily</COMMON>
<BOTANICAL>Erythronium americanum</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Shade</LIGHT>
<PRICE>$6.94</PRICE>
<AVAILABILITY>032499</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Adder's-Tongue</COMMON>
<BOTANICAL>Erythronium americanum</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Shade</LIGHT>
<PRICE>$9.58</PRICE>
<AVAILABILITY>041399</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Anemone</COMMON>
<BOTANICAL>Anemone blanda</BOTANICAL>
<ZONE>6</ZONE>
<LIGHT>Mostly Shady</LIGHT>
<PRICE>$8.86</PRICE>
<AVAILABILITY>122698</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Grecian Windflower</COMMON>
<BOTANICAL>Anemone blanda</BOTANICAL>
<ZONE>6</ZONE>
<LIGHT>Mostly Shady</LIGHT>
<PRICE>$9.16</PRICE>
<AVAILABILITY>071099</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Bee Balm</COMMON>
<BOTANICAL>Monarda didyma</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Shade</LIGHT>
<PRICE>$4.59</PRICE>
<AVAILABILITY>050399</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Bergamot</COMMON>
<BOTANICAL>Monarda didyma</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Shade</LIGHT>
<PRICE>$7.16</PRICE>
<AVAILABILITY>042799</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Black-Eyed Susan</COMMON>
<BOTANICAL>Rudbeckia hirta</BOTANICAL>
<ZONE>Annual</ZONE>
<LIGHT>Sunny</LIGHT>
<PRICE>$9.80</PRICE>
<AVAILABILITY>061899</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Buttercup</COMMON>
<BOTANICAL>Ranunculus</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Shade</LIGHT>
<PRICE>$2.57</PRICE>
<AVAILABILITY>061099</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Crowfoot</COMMON>
<BOTANICAL>Ranunculus</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Shade</LIGHT>
<PRICE>$9.34</PRICE>
<AVAILABILITY>040399</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Butterfly Weed</COMMON>
<BOTANICAL>Asclepias tuberosa</BOTANICAL>
<ZONE>Annual</ZONE>
<LIGHT>Sunny</LIGHT>
<PRICE>$2.78</PRICE>
<AVAILABILITY>063099</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Cinquefoil</COMMON>
<BOTANICAL>Potentilla</BOTANICAL>
<ZONE>Annual</ZONE>
<LIGHT>Shade</LIGHT>
<PRICE>$7.06</PRICE>
<AVAILABILITY>052599</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Primrose</COMMON>
<BOTANICAL>Oenothera</BOTANICAL>
<ZONE>3 - 5</ZONE>
<LIGHT>Sunny</LIGHT>
<PRICE>$6.56</PRICE>
<AVAILABILITY>013099</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Gentian</COMMON>
<BOTANICAL>Gentiana</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Sun or Shade</LIGHT>
<PRICE>$7.81</PRICE>
<AVAILABILITY>051899</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Blue Gentian</COMMON>
<BOTANICAL>Gentiana</BOTANICAL>
<ZONE>4</ZONE>
<LIGHT>Sun or Shade</LIGHT>
<PRICE>$8.56</PRICE>
<AVAILABILITY>050299</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Jacob's Ladder</COMMON>
<BOTANICAL>Polemonium caeruleum</BOTANICAL>
<ZONE>Annual</ZONE>
<LIGHT>Shade</LIGHT>
<PRICE>$9.26</PRICE>
<AVAILABILITY>022199</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Greek Valerian</COMMON>
<BOTANICAL>Polemonium caeruleum</BOTANICAL>
<ZONE>Annual</ZONE>
<LIGHT>Shade</LIGHT>
<PRICE>$4.36</PRICE>
<AVAILABILITY>071499</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>California Poppy</COMMON>
<BOTANICAL>Eschscholzia californica</BOTANICAL>
<ZONE>Annual</ZONE>
<LIGHT>Sun</LIGHT>
<PRICE>$7.89</PRICE>
<AVAILABILITY>032799</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Shooting Star</COMMON>
<BOTANICAL>Dodecatheon</BOTANICAL>
<ZONE>Annual</ZONE>
<LIGHT>Mostly Shady</LIGHT>
<PRICE>$8.60</PRICE>
<AVAILABILITY>051399</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Snakeroot</COMMON>
<BOTANICAL>Cimicifuga</BOTANICAL>
<ZONE>Annual</ZONE>
<LIGHT>Shade</LIGHT>
<PRICE>$5.63</PRICE>
<AVAILABILITY>071199</AVAILABILITY>
</PLANT>
<PLANT>
<COMMON>Cardinal Flower</COMMON>
<BOTANICAL>Lobelia cardinalis</BOTANICAL>
<ZONE>2</ZONE>
<LIGHT>Shade</LIGHT>
<PRICE>$3.02</PRICE>
<AVAILABILITY>022299</AVAILABILITY>
</PLANT>
</CATALOG>
'''

StringReader stringReader = new StringReader(XML);

XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
XMLStreamReader streamReader = xmlInputFactory.createXMLStreamReader(stringReader);
StringBuilder stringBuilder = new StringBuilder();

while(streamReader.hasNext()) {    
    streamReader.next();

    if (streamReader.isStartElement()) {
        switch (streamReader.getName().getLocalPart()) {
            case "PLANT" : {
                stringBuilder = new StringBuilder();
                break;
            }
            case "COMMON" : {
                streamReader.next()
                stringBuilder.append(String.format("COMMON=%s%n", streamReader.getText()));
                break;
            }            
            case "BOTANICAL" : {
                streamReader.next()
                stringBuilder.append(String.format("BOTANICAL=%s%n" , streamReader.getText()));
                break;
            }
            case "ZONE" : {
                streamReader.next()
                stringBuilder.append(String.format("ZONE=%s%n" , streamReader.getText()));
                break;
            }
            case "LIGHT" : {
                streamReader.next()
                stringBuilder.append(String.format("LIGHT=%s%n" , streamReader.getText()));
                break;
            }
            default : break;
        }
    }
    else if (streamReader.isEndElement()) {
        switch (streamReader.getName().getLocalPart()) {
            case "PLANT" : {
                System.out.println(stringBuilder)
                break;
            }
            default : break;
        }
    }
}