September 2017 Update

Task/XML-XPath/Kotlin/xml-xpath.kotlin

@@ -0,0 +1,63 @@
+// version 1.1.3
+
+import javax.xml.parsers.DocumentBuilderFactory
+import org.xml.sax.InputSource
+import java.io.StringReader
+import javax.xml.xpath.XPathFactory
+import javax.xml.xpath.XPathConstants
+import org.w3c.dom.Node
+import org.w3c.dom.NodeList
+
+val xml =
+"""
+<inventory title="OmniCorp Store #45x10^3">
+  <section name="health">
+    <item upc="123456789" stock="12">
+      <name>Invisibility Cream</name>
+      <price>14.50</price>
+      <description>Makes you invisible</description>
+    </item>
+    <item upc="445322344" stock="18">
+      <name>Levitation Salve</name>
+      <price>23.99</price>
+      <description>Levitate yourself for up to 3 hours per application</description>
+    </item>
+  </section>
+  <section name="food">
+    <item upc="485672034" stock="653">
+      <name>Blork and Freen Instameal</name>
+      <price>4.95</price>
+      <description>A tasty meal in a tablet; just add water</description>
+    </item>
+    <item upc="132957764" stock="44">
+      <name>Grob winglets</name>
+      <price>3.56</price>
+      <description>Tender winglets of Grob. Just add water</description>
+    </item>
+  </section>
+</inventory>
+"""
+
+fun main(args: Array<String>) {
+    val dbFactory = DocumentBuilderFactory.newInstance()
+    val dBuilder  = dbFactory.newDocumentBuilder()
+    val xmlInput = InputSource(StringReader(xml))
+    val doc = dBuilder.parse(xmlInput)
+    val xpFactory = XPathFactory.newInstance()
+    val xPath = xpFactory.newXPath()
+
+    val qNode = xPath.evaluate("/inventory/section/item[1]", doc, XPathConstants.NODE) as Node
+    val upc = qNode.attributes.getNamedItem("upc")
+    val stock = qNode.attributes.getNamedItem("stock")
+    println("For the first item :  upc = ${upc.textContent} and stock = ${stock.textContent}")
+
+    val qNodes = xPath.evaluate("/inventory/section/item/price", doc, XPathConstants.NODESET) as NodeList
+    print("\nThe prices of each item are : ")
+    for (i in 0 until qNodes.length) print("${qNodes.item(i).textContent}  ")
+    println()
+
+    val qNodes2 = xPath.evaluate("/inventory/section/item/name", doc, XPathConstants.NODESET) as NodeList
+    val names = Array<String>(qNodes2.length) { qNodes2.item(it).textContent }
+    println("\nThe names of each item are as follows :")
+    println("  ${names.joinToString("\n  ")}")
+}