JTable and HashMap

[vilastadoori]

The followign is my XML

<?xml version="1.0"?>
<catalog>
   <book id="bk101">
      <author>Gambardella, Matthew</author>
      <title>XML Developer's Guide</title>
      <genre>Computer</genre>
      <price>44.95</price>
      <publish_date>2000-10-01</publish_date>
      <description>An in-depth look at creating applications 
      with XML.</description>
      <add>yes</add>
   </book>
   <book id="bk102">
      <author>Ralls, Kim</author>
      <title>Midnight Rain</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2000-12-16</publish_date>
      <description>A former architect battles corporate zombies, 
      an evil sorceress, and her own childhood to become queen 
      of the world.</description>
      <add>yes</add>
   </book>
   <book id="bk103">
      <author>Corets, Eva</author>
      <title>Maeve Ascendant</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2000-11-17</publish_date>
      <description>After the collapse of a nanotechnology 
      society in England, the young survivors lay the 
      foundation for a new society.</description>
      <add>yes</add>
   </book>
   <book id="bk104">
      <author>Corets, Eva</author>
      <title>Oberon's Legacy</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2001-03-10</publish_date>
      <description>In post-apocalypse England, the mysterious 
      agent known only as Oberon helps to create a new life 
      for the inhabitants of London. Sequel to Maeve 
      Ascendant.</description>
      <add>yes</add>
   </book>
   <book id="bk105">
      <author>Corets, Eva</author>
      <title>The Sundered Grail</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2001-09-10</publish_date>
      <description>The two daughters of Maeve, half-sisters, 
      battle one another for control of England. Sequel to 
      Oberon's Legacy.</description>
      <add>yes</add>
   </book>
   <book id="bk106">
      <author>Randall, Cynthia</author>
      <title>Lover Birds</title>
      <genre>Romance</genre>
      <price>4.95</price>
      <publish_date>2000-09-02</publish_date>
      <description>When Carla meets Paul at an ornithology 
      conference, tempers fly as feathers get ruffled.</description>
      <add>yes</add>
   </book>
   <book id="bk107">
      <author>Thurman, Paula</author>
      <title>Splish Splash</title>
      <genre>Romance</genre>
      <price>4.95</price>
      <publish_date>2000-11-02</publish_date>
      <description>A deep sea diver finds true love twenty 
      thousand leagues beneath the sea.</description>
      <add>yes</add>
   </book>
   <book id="bk108">
      <author>Knorr, Stefan</author>
      <title>Creepy Crawlies</title>
      <genre>Horror</genre>
      <price>4.95</price>
      <publish_date>2000-12-06</publish_date>
      <description>An anthology of horror stories about roaches,
      centipedes, scorpions  and other insects.</description>
      <add>yes</add>
   </book>
   <book id="bk109">
      <author>Kress, Peter</author>
      <title>Paradox Lost</title>
      <genre>Science Fiction</genre>
      <price>6.95</price>
      <publish_date>2000-11-02</publish_date>
      <description>After an inadvertant trip through a Heisenberg
      Uncertainty Device, James Salway discovers the problems 
      of being quantum.</description>
      <add>yes</add>
   </book>
   <book id="bk110">
      <author>O'Brien, Tim</author>
      <title>Microsoft .NET: The Programming Bible</title>
      <genre>Computer</genre>
      <price>36.95</price>
      <publish_date>2000-12-09</publish_date>
      <description>Microsoft's .NET initiative is explored in 
      detail in this deep programmer's reference.</description>
      <add>yes</add>
   </book>
   <book id="bk111">
      <author>O'Brien, Tim</author>
      <title>MSXML3: A Comprehensive Guide</title>
      <genre>Computer</genre>
      <price>36.95</price>
      <publish_date>2000-12-01</publish_date>
      <description>The Microsoft MSXML3 parser is covered in 
      detail, with attention to XML DOM interfaces, XSLT processing, 
      SAX and more.</description>
      <add>yes</add>
   </book>
   <book id="bk112">
      <author>Galos, Mike</author>
      <title>Visual Studio 7: A Comprehensive Guide</title>
      <genre>Computer</genre>
      <price>49.95</price>
      <publish_date>2001-04-16</publish_date>
      <description>Microsoft Visual Studio 7 is explored in depth,
      looking at how Visual Basic, Visual C++, C#, and ASP+ are 
      integrated into a comprehensive development 
      environment.</description>
      <add>yes</add>-
   </book>
</catalog>

I am using an DOM parser to parse and I have put the xml in an hashMap.
ie., HashMap<String, HashMap<String,String> to represent the id and the tag values in another hashmap , now when I am trying to iteratethorugh the hashmap it is only showing the last value in the hashmap.THe below is the code snippet, kindly advise where I am going wrong

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package domparser;



import java.util.HashMap;
import java.util.Iterator;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;


/**
 *
 * @author Shreeansh Suman
 */
public class Domparser 
{

    public static HashMap<String,String> hmDetails = new HashMap<String,String>();
    public static HashMap<String,HashMap<String,String>> hmData = new HashMap<String,HashMap<String,String>>();
    public static String bookRootElement ;


    public static void main(String[] args) 
    {
        HashMap<String,String> detailsHM = new HashMap<String,String>();
        try
        {
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document doc =db.parse("E:\\dd\\books.xml");
        NodeList booknodelist = doc.getElementsByTagName("book");
        int size = booknodelist.getLength();

        for( int i =0; i < size; i++)
        {
           Node booknode= booknodelist.item(i);
           if(booknode.getNodeType() == Element.ELEMENT_NODE)
           {
                Element bookElement =(Element)booknode;
                bookRootElement = bookElement.getAttribute("id");
                //System.out.println("bookRootElement" +" :" +bookRootElement);
                NodeList bookChildNodes = bookElement.getChildNodes();

                for( int j =0 ; j<bookChildNodes.getLength(); j++)
                {
                     Node bookNodeElement = bookChildNodes.item(j);
                     if( bookNodeElement.getNodeType() == Element.ELEMENT_NODE)
                     {
                          Element elementNodeBook = (Element)bookNodeElement;
                         // System.out.println(elementNodeBook.getTagName() + " : " + elementNodeBook.getTextContent());
                          hmDetails.put(elementNodeBook.getTagName(), elementNodeBook.getTextContent());
                     }


                }

           }



        }
         for( String str : hmData.keySet())
           {
               System.out.println(str + hmData.get(str));
           }

//        Iterator<String> itrKey =hmData.keySet().iterator();
//        while(itrKey.hasNext())
//        {
//            String bookId = itrKey.next();
//            System.out.println("BookID" +" :"+ bookId+ " ");
//            detailsHM = hmData.get(bookId);
//            for( String tag : detailsHM.keySet())
//            {
//                String content = detailsHM.get(tag);
//                System.out.println(" Key" + " :" + tag +" :"+ "COntent" +" :"+ content);
//            }
//            
//        }

        }
        catch(Exception ex)
        {
            System.out.println(ex.getMessage());
        }


    }

}

[JamesCherrill]

After a quick look at that code I see three HashMaps. Only one seems to get anything put in it, and only one (not the same) gets printed. Makes no sense to me.

[vilastadoori]

probably yes. I have remodeled and it is working and i need to extend it to add this to the jtable.
The reason why i am using the third HM is

 Iterator<String> itr = hmData.iterator();
 while( itr.hasNext())
 {
  String str =  itr.next() //will get the key from the hashmap
  //third hasmap is to use get the value from the key which is the hashmap
  detailsHm = hmData.get(str);
   while iterating  add the data to the vector and add it as an row to the table.


 }




package domparser;

import java.util.HashMap;
import java.util.Iterator;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;



public class Domparser
{

       public static HashMap<String,String>hmDetails = new HashMap<String,String>();
       public static HashMap<String,HashMap<String,String>> hmData = new HashMap<String, HashMap<String,String>>();
       public String tagElementkey;
       public String tagContentvalue;
       public static String bookid;

       public static void mapIteration(HashMap<String,HashMap<String,String>> hmData)
       {

              String bId = null ;
              HashMap<String,String> dataHm = new HashMap<String,String>();

              Iterator<String> itrset =hmData.keySet().iterator();
              while(itrset.hasNext())
              {
                       bId = itrset.next();

                       dataHm = hmData.get(bId); 
                       //System.out.println("BID" +" :"+ bId);


               }

               System.out.println("bookId"+":"+ bookid);
              for( String str : dataHm.keySet())
              {
                     System.out.println(str+"--"+dataHm.get(str));
              }



       }

       public static void treeToHashMap()
       {

              try
              {

                     DocumentBuilderFactory dbf =DocumentBuilderFactory.newInstance();
                     DocumentBuilder db =dbf.newDocumentBuilder();

                     Document doc =db.parse("E:\\dd\\books.xml");

                     NodeList booknodelist =doc.getElementsByTagName("book");
                     int size = booknodelist.getLength();


                     for( int i =0; i<booknodelist.getLength(); i++)
                     {
                           Node booknode =booknodelist.item(i);

                           if( booknode.getNodeType() == Node.ELEMENT_NODE)
                           {

                                  Element nodebook = (Element) booknode;

                                  bookid =nodebook.getAttribute("id");

                                  NodeList nodelistbook = nodebook.getChildNodes();


                                  for( int j=0 ; j< nodelistbook.getLength(); j++)
                                  {
                                         Node current = nodelistbook.item(j);

                                         if( current.getNodeType() == Node.ELEMENT_NODE)

                                         {

                                                Element ele = (Element)current;

                                                hmDetails.put(ele.getTagName(), ele.getTextContent());

                                         }



                                  }



                           }

                           //hmDetails.put(tagElementkey, tagContentvalue);
                           /*for(String sr : hmDetails.keySet())
                           {
                                  System.out.println(sr + " :" +hmDetails.get(sr));
                           } */

                           hmData.put(bookid, hmDetails);

                           mapIteration(hmData);
                     }




              }

       catch(Exception ex)
       {

              System.out.println(ex.getMessage());
       }


}


       public static void main(String[] args)
       {

              treeToHashMap();



       }

}

[JamesCherrill]

As far as I can see you need a variable (pointer) when retrieving the values (line 6), but not another HashMap.

[vilastadoori]

The ideal way to parse the xml elements from the xml file and display the node elements in the JTable. Here is the code as below

 package domparser;

    import java.awt.BorderLayout;
    import java.awt.EventQueue;

    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.border.EmptyBorder;
    import javax.swing.JScrollPane;
    import java.awt.GridLayout;
    import javax.swing.JTable;
    import javax.swing.table.DefaultTableModel;
    import java.awt.Dimension;
    import java.awt.Window.Type;

    public class Domparsergui extends JFrame {

        private JPanel contentPane;
        private static JTable table;

        /**
         * Launch the application.
         */
        public static void main(String[] args) {
            EventQueue.invokeLater(new Runnable() {
                public void run() {
                    try {
                        Domparsergui frame = new Domparsergui();
                        frame.setVisible(true);
                        Domparser.treeToHashMap(table);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });
        }

        /**
         * Create the frame.
         */
        public Domparsergui() {
            setType(Type.UTILITY);
            setTitle("Books ");
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            setBounds(100, 100, 958, 361);
            contentPane = new JPanel();
            contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
            setContentPane(contentPane);
            contentPane.setLayout(null);

            JPanel panel = new JPanel();
            panel.setSize(new Dimension(10, 10));
            panel.setBounds(0, 0, 880, 184);
            contentPane.add(panel);
            panel.setLayout(new GridLayout(1, 0, 0, 0));

            JScrollPane scrollPane = new JScrollPane();
            panel.add(scrollPane);

            table = new JTable();
            table.setSize(new Dimension(100, 100));
            table.setToolTipText("");
            table.setModel(new DefaultTableModel(
                new Object[][] {
                },
                new String[] {
                    "Author", "Title", "Genre", "Price", "Publish Date", "Description"
                }
            ));
            scrollPane.setViewportView(table);

        }
    }

Parser code

package domparser;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.StringTokenizer;
import java.util.Vector;

import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;



public class Domparser
{

       public static HashMap<String,String>hmDetails = new HashMap<String,String>();
       public static HashMap<String,HashMap<String,String>> hmData = new HashMap<String, HashMap<String,String>>();
       public String tagElementkey;
       public String tagContentvalue;
       public static String bookid;
       //public static Vector<String> vData = new Vector<String>();
       public static ArrayList<Books> alFields = new ArrayList<Books>();
       public static Books b;
       public static JTable domTable;

       public static void mapIteration(HashMap<String,HashMap<String,String>> hmData, JTable table)
       {
              domTable = table;
              String bId = null ;
              HashMap<String,String> dataHm = new HashMap<String,String>();

              //DefaultTableModel tableModel =  (DefaultTableModel)domTable.getModel();



              Iterator<String> itrset =hmData.keySet().iterator();
              while(itrset.hasNext())
              {
                       bId = itrset.next();

                       dataHm = hmData.get(bId); 

               }

              populateTable(dataHm, domTable);




       }

       public static void populateTable(HashMap<String,String> dataHm, JTable domTable) 
       {

           String[] col= {"Author", "Title", "Genre", "Price", "Publish Date", "Description"};
           alFields = new ArrayList<Books>();

           for( String st : dataHm.keySet())
            {
                String author=dataHm.get("author");
                String title =dataHm.get("title");
                String genre =dataHm.get("genre");
                String price = dataHm.get("price");
                String publish_date = dataHm.get("publish_date");
                String description = dataHm.get("description");

                b= new Books(author, title, genre, price,publish_date,description); 

            }

           alFields.add(b);               


        DefaultTableModel dmt = (DefaultTableModel)domTable.getModel();
          // DefaultTableModel dmt = new DefaultTableModel(col, 0);




            for( int i =0; i<alFields.size(); i++)
            {
                String author = alFields.get(i).getAuthor();
                String title = alFields.get(i).getTitle();
                String price = alFields.get(i).getPrice();
                String genre = alFields.get(i).getGenre();
                String  publish_date = alFields.get(i).getPublish_date();
                String desc = alFields.get(i).getDescription();

                //str = sb.append(author).append(",").append(title).append(",").append(genre).append(",").append(price).append(",").append(publish_date).append(",").append(desc).toString();
                //System.out.println(str);
                Object[] data = {author,title,genre,price,publish_date,desc};
                dmt.addRow(data);

            }

              ColumnAdjuster ca = new ColumnAdjuster(domTable);
              ca.adjustColumns();


       }

    /*public static ArrayList<String> convertStringToArrayList(String str, String delim)
    {

        ArrayList<String> elements = new ArrayList<String>();
        StringTokenizer stkn = new StringTokenizer(str,delim,false);

        while(stkn.hasMoreTokens())
        {
            String token = stkn.nextToken();
            elements.add(token);
        }

        return elements;

    }  */

       public static void treeToHashMap(JTable table)
       {

              try
              {

                     DocumentBuilderFactory dbf =DocumentBuilderFactory.newInstance();
                     DocumentBuilder db =dbf.newDocumentBuilder();

                     Document doc =db.parse("E:\\dd\\books.xml");

                     NodeList booknodelist =doc.getElementsByTagName("book");
                     int size = booknodelist.getLength();


                     for( int i =0; i<booknodelist.getLength(); i++)
                     {
                           Node booknode =booknodelist.item(i);

                           if( booknode.getNodeType() == Node.ELEMENT_NODE)
                           {

                                  Element nodebook = (Element) booknode;

                                  bookid =nodebook.getAttribute("id");

                                  NodeList nodelistbook = nodebook.getChildNodes();


                                  for( int j=0 ; j< nodelistbook.getLength(); j++)
                                  {
                                         Node current = nodelistbook.item(j);

                                         if( current.getNodeType() == Node.ELEMENT_NODE)

                                         {

                                                Element ele = (Element)current;

                                                hmDetails.put(ele.getTagName(), ele.getTextContent());

                                         }



                                  }



                           }

                           //hmDetails.put(tagElementkey, tagContentvalue);
                           /*for(String sr : hmDetails.keySet())
                           {
                                  System.out.println(sr + " :" +hmDetails.get(sr));
                           } */

                           hmData.put(bookid, hmDetails);

                           mapIteration(hmData, table);
                     }




              }

       catch(Exception ex)
       {

              System.out.println(ex.getMessage());
       }


}



}

The books.java class that will convert each element into an object

Column Adjuster code that will adjust the columns while displaying.

import java.util.Date;

public class Books 
{



     private String author;
     private String title;
     private String genre;
     private String price;
     private String publish_date;
     private String description;

    public Books(String author, String title, String genre, String price, String publish_date, String description) 
    {
        super();
        this.author = author;
        this.title = title;
        this.genre = genre;
        this.price = price;
        this.publish_date = publish_date;
        this.description = description;
    }
    /**
     * @return the author
     */
    public String getAuthor() 
    {
        return author;
    }
    /**
     * @return the title
     */
    public String getTitle() {
        return title;
    }
    /**
     * @return the genre
     */
    public String getGenre() {
        return genre;
    }
    /**
     * @return the price
     */
    public String getPrice() {
        return price;
    }
    /**
     * @return the publish_date
     */
    public String getPublish_date() {
        return publish_date;
    }
    /**
     * @return the description
     */
    public String getDescription() {
        return description;
    }
    /**
     * @param author the author to set
     */
    public void setAuthor(String author) {
        this.author = author;
    }
    /**
     * @param title the title to set
     */
    public void setTitle(String title) {
        this.title = title;
    }
    /**
     * @param genre the genre to set
     */
    public void setGenre(String genre) {
        this.genre = genre;
    }
    /**
     * @param price the price to set
     */
    public void setPrice(String price) {
        this.price = price;
    }
    /**
     * @param publish_date the publish_date to set
     */
    public void setPublish_date(String publish_date) {
        this.publish_date = publish_date;
    }
    /**
     * @param description the description to set
     */
    public void setDescription(String description) {
        this.description = description;
    }
    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return "Books [author=" + author + ", title=" + title + ", genre=" + genre + ", price=" + price
                + ", publish_date=" + publish_date + ", description=" + description + "]";
    }



}




/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package domparser;

import java.awt.Component;
import javax.swing.JTable;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

/**
 *
 * @author 
 */
public class ColumnAdjuster {
    JTable table;
    int spacing = 3;
    public ColumnAdjuster(JTable tableObj) {
        this.table = tableObj;
    }

    public void adjustColumns() {
        TableColumnModel colModelObj = table.getColumnModel();
        int iColCount = colModelObj.getColumnCount();
        for(int i = 0; i < iColCount; i++) {
             adjustColumn(i);
        }
    }

    public void adjustColumn(int colIndex) {
        TableColumn tableColumn = table.getColumnModel().getColumn(colIndex);
        int columnHeaderWidth = getColumnHeaderWidth(colIndex);
        int columnDataWidth   = getColumnDataWidth(colIndex);
        int preferredWidth    = Math.max(columnHeaderWidth, columnDataWidth);
        updateTableColumn(colIndex, preferredWidth);
    }

    private int getColumnHeaderWidth(int colIndex) {
        TableColumn tableColumn = table.getColumnModel().getColumn(colIndex);
        Object value = tableColumn.getHeaderValue();
        TableCellRenderer renderer = tableColumn.getHeaderRenderer();
        if (renderer == null) {
            renderer = table.getTableHeader().getDefaultRenderer();
        }
        Component c = renderer.getTableCellRendererComponent(table, value, false, false, -1, colIndex);
        return c.getPreferredSize().width;
    }        

    private int getColumnDataWidth(int colIndex) {
        int preferredWidth = 0;
        int maxWidth = table.getColumnModel().getColumn(colIndex).getMaxWidth();
        int iRowCount = table.getRowCount();
        for (int rowIndex = 0; rowIndex < iRowCount; rowIndex++) {
            preferredWidth = Math.max(preferredWidth, getCellDataWidth(rowIndex, colIndex));
            if (preferredWidth >= maxWidth) {
                    break;
            }
        }
        return preferredWidth;
    }

    private int getCellDataWidth(int rowIndex, int colIndex) {
        TableCellRenderer cellRenderer = table.getCellRenderer(rowIndex, colIndex);
        Component c = table.prepareRenderer(cellRenderer, rowIndex, colIndex);
        int width = c.getPreferredSize().width + table.getIntercellSpacing().width;
        return width;
    }

    private void updateTableColumn(int colIndex, int width) {
        TableColumn tableColumn = table.getColumnModel().getColumn(colIndex);
        width += spacing;
        table.getTableHeader().setResizingColumn(tableColumn);
        tableColumn.setWidth(width);
    }   
}