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POJTable not displaying my xml data
 

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  1. POJTable not displaying my xml data
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    <p>I am working with data collected from an XML file. I created a class called <code>XMLReader</code> which is suppose to be able to read my XML data format using a method called <code>readFromFile</code> which returns an <code>ArrayList&lt;HashMap&lt;String, String&gt;&gt;</code>. </p> <p>I Also created a class that <code>extends</code> <code>AbstractTableModel</code>, and I create an instance of <code>XMLReader</code> from the constructor and call the <code>readFromFile</code> method. The point is I implemented everything I know that needs to be Implemented and overrode everything that needs overriding, but still I still can't get my <code>JTable</code> to display the data from the XML file. Bellow is the <code>XMLReader</code> class and the class that <code>extends</code> <code>AbstractTableModel</code> respectively.</p> <pre><code> package meetingmanager; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.HashMap; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import org.w3c.dom.DOMException; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NamedNodeMap; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.SAXException; public class XMLReader { private static final String filePath = "XMLData.xml"; public String sN; public String firstName; public String surName; public String visitTime; public String scheduledTime; public String whomToVisit; public String reasonForVisit; public String status; public XMLReader() { } public ArrayList&lt;HashMap&lt;String, String&gt;&gt; readFromFile() { try{ File xmlFile = new File(filePath); DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder dBuilder = docFactory.newDocumentBuilder(); Document doc = dBuilder.parse(xmlFile); doc.getDocumentElement().normalize(); NodeList nList = doc.getElementsByTagName("Visitor"); ArrayList&lt;HashMap&lt;String, String&gt;&gt; tblData = new ArrayList&lt;&gt;(); for(int i = 0; i&lt;nList.getLength(); i++) { Node nNode = nList.item(i); NamedNodeMap attr = nNode.getAttributes(); Node nodeAttr = attr.getNamedItem("id"); String[] rowValues = new String[8]; HashMap&lt;String, String&gt; mp = new HashMap&lt;&gt;(); sN = nodeAttr.getTextContent(); if(nNode.getNodeType() == Node.ELEMENT_NODE) { NodeList valueList = nNode.getChildNodes(); for(int j=0; j&lt;valueList.getLength(); j++) { rowValues[0] = sN; Node eachValue = valueList.item(j); String nodeName = eachValue.getNodeName(); String value = eachValue.getTextContent(); mp.put("sN", sN); int count = j+1; switch(nodeName) { case "FirstName": firstName = value; rowValues[count] = value; mp.put("FirstName", value); break; case "SurName": surName = value; rowValues[count] = value; mp.put("SurName", value); break; case "VisitTime": visitTime = value; rowValues[count] = value; break; case "ScheduledTime": scheduledTime = value; rowValues[count] = value; mp.put("ScheduledTime", value); break; case "WhomToVisit": whomToVisit = value; rowValues[count] = value; mp.put("WhomToVisit", value); break; case "ReasonForVisit": reasonForVisit = value; mp.put("ReasonForVisit", value); rowValues[count] = value; break; case "Status": status = value; rowValues[count] = value; mp.put("Status", value); break; } } // tblData.add(rowValues); tblData.add(mp); } } return tblData; //System.out.println(tblData.get(1000)[0]); }catch(ParserConfigurationException | SAXException | IOException | DOMException ex) { } return null; } </code></pre> <p>Here is the <code>AbstractTableModel</code> class</p> <pre><code> package meetingmanager; import java.io.*; import java.util.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.table.*; public class TableModel extends AbstractTableModel implements TableModelListener{ ArrayList&lt;TableData&gt; tblData = new ArrayList&lt;TableData&gt;(); ArrayList&lt;FileContent&gt; tblData2 = new ArrayList&lt;FileContent&gt;(); String[] columnName = {"S/N", "VisitorName", "Date of Visit", "Scheduled Date", "Whom to see", "Reason of visit", "status of Visit"}; ArrayList&lt;HashMap&lt;String, String&gt;&gt; fileData; @SuppressWarnings("unchecked") public TableModel() { fileData = new XMLReader().readFromFile(); } @Override public void tableChanged(TableModelEvent e) { throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. } @Override public int getRowCount() { return tblData.size(); } @Override public int getColumnCount() { return 7; } @Override public Object getValueAt(int rowIndex, int columnIndex) { switch(columnIndex){ case 0: return fileData.get(rowIndex).get("sN"); case 1: return fileData.get(rowIndex).get("FirstName")+ " "+ fileData.get(rowIndex).get("SurName"); case 2: return fileData.get(rowIndex).get("VisitTime"); case 3: return fileData.get(rowIndex).get("ScheduledTime"); case 4: return fileData.get(rowIndex).get("WhomToVisit"); case 5: return fileData.get(rowIndex).get("ReasonForVisit"); case 6: return fileData.get(rowIndex).get("Status"); default: return ""; } } @Override public String getColumnName(int col) { return columnName[col]; } } </code></pre> <p>Funny things happen, the table displays the information when I put the line of code bellow, it was only meant for testing, but when I placed it in the constructor of <code>TableModel</code> it displayed all my values, but when I remove it the table refuses to display</p> <pre><code>for(int i=0; i&lt;fileData.size(); i++){ tblData.add(new TableData(1, "", "", "", "", "", "")); } </code></pre> <p>I have been working on this for the past <code>ten hours</code> now without a solution or explanation to why all the funny things happen. I would appreciate all help. Thanks</p>
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    1. USAndrew Thompson
    1. USJames Okpe George
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