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POListening to JTable changes
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  1. POListening to JTable changes
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    copied!<p>I have a class called Model that I wanted to represent as JTable, I manged to do that through subclassing AbstractTableModel. my problem is how to listen to changes in data and update my model, I looked into many tutorials and I found out that they implement TableModelListener and use void tableChanged() method but that didn't work for, som how I couldn't go into tableChanged() method and do the manipulation that I wanted. Instead went into setValueAt() method and implemented the logic i want inside it and it worked but i had to implement TableModelListener interface and it's method tableChanged() with empty code which i don't understand why. I think I have a problem understanding how tableListener works.</p> <pre><code> package model; import java.util.ArrayList; import javax.swing.event.TableModelEvent; import javax.swing.event.TableModelListener; import javax.swing.table.AbstractTableModel; public class ModelsTable extends AbstractTableModel implements TableModelListener { private String[] columnNames = { "Model", "mac start", "mac end", "host start", "host end", "dn start" , "dn end", "sn start" , "sn end"}; private ModelsDictionary dictionary = ModelsDictionary.getModelsDictionary(); public ModelsTable() { this.addTableModelListener(this); } public void fireTableCellUpdated(int row, int col) { System.out.println(row + "" + col); } @Override public int getColumnCount() { return columnNames.length; } @Override public int getRowCount() { return dictionary.getAllModels().size(); } public String getColumnName(int col) { return columnNames[col]; } @Override public void setValueAt(Object aValue, int row, int col) { System.out.println(row + " " + col); Model model = dictionary.getAllModels().get(row); Model newModel; if(col == 0) { newModel = new Model((String)aValue,model.getMacStart(),model.getMacEnd(),model.getHostStart(),model.getHostEnd(),model.getDnStart(),model.getDnEnd(),model.getSnStart(),model.getSnEnd()); dictionary.updateModel(model,newModel); } else if(col == 1) { newModel = new Model(model.getNumber(),(String)aValue,model.getMacEnd(),model.getHostStart(),model.getHostEnd(),model.getDnStart(),model.getDnEnd(),model.getSnStart(),model.getSnEnd()); dictionary.updateModel(model,newModel); } else if(col == 2) { newModel = new Model(model.getNumber(),model.getMacStart(),(String)aValue,model.getHostStart(),model.getHostEnd(),model.getDnStart(),model.getDnEnd(),model.getSnStart(),model.getSnEnd()); dictionary.updateModel(model,newModel); } else if(col == 3) { newModel = new Model(model.getNumber(),model.getMacStart(),model.getMacEnd(),(String)aValue,model.getHostEnd(),model.getDnStart(),model.getDnEnd(),model.getSnStart(),model.getSnEnd()); dictionary.updateModel(model,newModel); } else if(col == 4) { newModel = new Model(model.getNumber(),model.getMacStart(),model.getMacEnd(),model.getHostStart(),(String)aValue,model.getDnStart(),model.getDnEnd(),model.getSnStart(),model.getSnEnd()); dictionary.updateModel(model,newModel); } else if(col == 5) { newModel = new Model(model.getNumber(),model.getMacStart(),model.getMacEnd(),model.getHostStart(),model.getHostEnd(),(String)aValue,model.getDnEnd(),model.getSnStart(),model.getSnEnd()); dictionary.updateModel(model,newModel); } else if(col == 6) { newModel = new Model(model.getNumber(),model.getMacStart(),model.getMacEnd(),model.getHostStart(),model.getHostEnd(),model.getDnStart(),(String)aValue,model.getSnStart(),model.getSnEnd()); dictionary.updateModel(model,newModel); } else if(col == 7) { newModel = new Model(model.getNumber(),model.getMacStart(),model.getMacEnd(),model.getHostStart(),model.getHostEnd(),model.getDnStart(),model.getDnEnd(),(String)aValue,model.getSnEnd()); dictionary.updateModel(model,newModel); } else if(col == 8) { newModel = new Model(model.getNumber(),model.getMacStart(),model.getMacEnd(),model.getHostStart(),model.getHostEnd(),model.getDnStart(),model.getDnEnd(),model.getSnStart(),(String)aValue); dictionary.updateModel(model,newModel); } } @Override public Object getValueAt(int x, int y) { Model model = dictionary.getAllModels().get(x); switch(y) { case 0: return model.getNumber(); case 1: return model.getMacStart(); case 2: return model.getMacEnd(); case 3: return model.getHostStart(); case 4: return model.getHostEnd(); case 5: return model.getDnStart(); case 6: return model.getDnEnd(); case 7: return model.getSnStart(); case 8: return model.getSnStart(); default: return "unknown"; } } public boolean isCellEditable(int row, int col) { return true; } @Override public void tableChanged(TableModelEvent event) { System.out.println("lol"); int row = event.getFirstRow(); int column = event.getColumn(); ModelsTable model = (ModelsTable)event.getSource(); String columnName = model.getColumnName(column); Model data = (Model) model.getValueAt(row, column); System.out.println(model); } } </code></pre> <p>and this is the panel that im showing the JTable in it package view;</p> <pre><code>import java.awt.Color; import java.awt.Dimension; import java.awt.GridLayout; import java.util.ArrayList; import javax.swing.JLabel; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.JPanel; import javax.swing.JTextArea; import javax.swing.event.TableModelEvent; import javax.swing.event.TableModelListener; import Control.InteractiveTableModelListener; import model.Model; import model.ModelsDictionary; import model.ModelsTable; import net.miginfocom.swing.MigLayout; public class AllModelsPanel extends JPanel { private boolean DEBUG = false; public AllModelsPanel() { super(new GridLayout(1, 0)); ArrayList&lt;Model&gt; models = ModelsDictionary.getModelsDictionary().getAllModels(); JTable table = new JTable(); table.setModel(new ModelsTable()); table.setPreferredScrollableViewportSize(new Dimension(500, 70)); table.setFillsViewportHeight(true); JScrollPane scrollPane = new JScrollPane(table); add(scrollPane); } } </code></pre> <p>and this is my ModelsDictionary class which aggregate Model class to add fuctionalties like reading/writing to DB or Files ** note: i'm using singelton design pattern.</p> <pre><code>package model; import java.io.File; import java.util.ArrayList; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; public class ModelsDictionary { private static ModelsDictionary myInstance; private ArrayList&lt;Model&gt; models = new ArrayList&lt;Model&gt;(); private ArrayList&lt;String&gt; modelNumbers = new ArrayList&lt;String&gt;(); private ModelsDictionary() { readXMLfile(); } public static ModelsDictionary getModelsDictionary() { if (myInstance == null ) { synchronized(ModelsDictionary.class) { if( myInstance == null) { myInstance = new ModelsDictionary(); } } } return myInstance; } public void addModel(Model model) { models.add(model); modelNumbers.add(model.getNumber()); writeXMLfile(); } public void deleteModel(Model model) { models.remove(model); modelNumbers.remove(model.getNumber()); } public void updateModel(Model oldModel, Model newModel) { int index = models.indexOf(oldModel); System.out.println("index" + index); models.set(index, newModel); writeXMLfile(); } public Model getModel(String modelNumber) { //System.out.println("getModels ,,,, models size: " +models.size()); for(Model model: models) { //System.out.println("in models"); if(model.getNumber().equals(modelNumber)) { //System.out.println("model number matched"); return model; } } return null; } public ArrayList&lt;Model&gt; getAllModels() { return models; } public ArrayList&lt;String&gt; getAllModelNumbers() { return modelNumbers; } public void readXMLfile() { models = new ArrayList&lt;Model&gt;(); try { DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder dBuilder = dbFactory.newDocumentBuilder(); File file = new File("models.xml"); if(file.exists()) { Document doc = dBuilder.parse(file); doc.getDocumentElement().normalize(); NodeList nList = doc.getElementsByTagName("Model"); for (int i = 0; i &lt; nList.getLength(); i++) { Node nNode = nList.item(i); if (nNode.getNodeType() == Node.ELEMENT_NODE) { Element eElement = (Element)nNode; String number = eElement.getElementsByTagName("Number").item(0).getTextContent(); String macStart = eElement.getElementsByTagName("MacStart").item(0).getTextContent(); String macEnd = eElement.getElementsByTagName("MacEnd").item(0).getTextContent(); String hostStart = eElement.getElementsByTagName("HostStart").item(0).getTextContent(); String hostEnd = eElement.getElementsByTagName("HostEnd").item(0).getTextContent(); String snStart = eElement.getElementsByTagName("SnStart").item(0).getTextContent(); String snEnd = eElement.getElementsByTagName("SnEnd").item(0).getTextContent(); String dnStart = eElement.getElementsByTagName("DnStart").item(0).getTextContent(); String dnEnd = eElement.getElementsByTagName("DnEnd").item(0).getTextContent(); Model model = new Model(number); model.setMacPatt(macStart, macEnd); model.setDnPatt(dnStart, dnEnd); model.setSnPatt(snStart, snEnd); model.setHostPatt(hostStart, hostEnd); addModel(model); } } } } catch(Exception e) { e.printStackTrace(); } } public void writeXMLfile() { try { DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder docBuilder = docFactory.newDocumentBuilder(); Document doc = docBuilder.newDocument(); Element rootElement = doc.createElement("Models"); doc.appendChild(rootElement); for(Model model : models) { Element m = doc.createElement("Model"); rootElement.appendChild(m); Element number = doc.createElement("Number"); number.setTextContent(model.getNumber()); m.appendChild(number); Element macStart = doc.createElement("MacStart"); macStart.setTextContent(model.getMacStart()); m.appendChild(macStart); Element macEnd = doc.createElement("MacEnd"); macEnd.setTextContent(model.getMacEnd()); m.appendChild(macEnd); Element hostStart = doc.createElement("HostStart"); hostStart.setTextContent(model.getHostStart()); m.appendChild(hostStart); Element hostEnd = doc.createElement("HostEnd"); hostEnd.setTextContent(model.getHostEnd()); m.appendChild(hostEnd); Element dnStart = doc.createElement("DnStart"); dnStart.setTextContent(model.getDnStart()); m.appendChild(dnStart); Element dnEnd = doc.createElement("DnEnd"); dnEnd.setTextContent(model.getDnEnd()); m.appendChild(dnEnd); Element snStart = doc.createElement("SnStart"); snStart.setTextContent(model.getSnStart()); m.appendChild(snStart); Element snEnd = doc.createElement("SnEnd"); snEnd.setTextContent(model.getSnEnd()); m.appendChild(snEnd); } TransformerFactory transformerFactory = TransformerFactory.newInstance(); Transformer transformer = transformerFactory.newTransformer(); transformer.setOutputProperty(OutputKeys.INDENT, "yes"); transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2"); DOMSource source = new DOMSource(doc); File file = new File("models.xml"); StreamResult result = new StreamResult(file); transformer.transform(source, result); } catch(Exception e) { e.printStackTrace(); } } } </code></pre> <p>the question is: i'm I doing this the right way because i intend to add more functionalties like add row and remove row. because it seems the code is working to edit cells by just using the setValueAt() method only and i don't how or why</p>
 

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