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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.border.TitledBorder;
@SuppressWarnings("serial")
public class CompressDecompressGUI extends JFrame
{
JPanel inputTextAreaPanel;
JPanel outputTreePanel;
JPanel outputCompressPanel;
JPanel outputDecompressPanel;
JPanel inputTextPanel;
JPanel treeTextPanel;
JPanel outputTextPanel;
JTextArea inputTextArea;
JTextArea outputTreeArea;
JTextArea outputCompressArea;
JTextArea outputDecompressArea;
JScrollPane inputTextPane;
JScrollPane outputTreePane;
JScrollPane compressPane;
JScrollPane decompressPane;
JLabel inputNumberOfCharactersLabel;
JLabel inputNumberOfBytesLabel;
JLabel treeNumberOfCharactersLabel;
JLabel treeNumberOfBytesLabel;
JLabel outputNumberOfBytesLabel;
JLabel outputTotalNumberOfBytesLabel;
JLabel compressLabel;
KeyListener kListener;
public CompressDecompressGUI()
{
setLayout(new GridLayout(2,2));
setTextAreasAndPanels();
}
private void setTextAreasAndPanels()
{
Font monoFont = new Font("Monospaced", Font.BOLD, 14);
// Input Text
inputTextAreaPanel = new JPanel();
inputTextAreaPanel.setBackground(Color.WHITE);
inputTextAreaPanel.setLayout(new BorderLayout());
inputTextAreaPanel.setBorder(new TitledBorder("Type Your Message Here"));
inputTextArea = new JTextArea();
inputTextArea.setEditable(true);
inputTextArea.setLineWrap(true);
inputTextArea.setFont(monoFont);
kListener = new InputKeyEvent();
inputTextArea.addKeyListener(kListener);
inputTextPane = new JScrollPane(inputTextArea);
inputTextAreaPanel.add(inputTextPane);
inputTextPanel = new JPanel();
inputTextPanel.setLayout(new GridLayout(2,1));
inputNumberOfCharactersLabel = new JLabel("Number of Characters: 0");
inputNumberOfBytesLabel = new JLabel("Number of Bytes: 0");
inputTextPanel.add(inputNumberOfCharactersLabel);
inputTextPanel.add(inputNumberOfBytesLabel);
inputTextAreaPanel.add(inputTextPanel, BorderLayout.SOUTH);
// Output Tree
outputTreePanel = new JPanel();
outputTreePanel.setBackground(Color.WHITE);
outputTreePanel.setLayout(new BorderLayout());
outputTreePanel.setBorder(new TitledBorder("Tree Structure"));
outputTreeArea = new JTextArea();
outputTreeArea.setEditable(false);
outputTreeArea.setLineWrap(true);
outputTreeArea.setFont(monoFont);
outputTreePane = new JScrollPane(outputTreeArea);
outputTreePanel.add(outputTreePane);
treeTextPanel = new JPanel();
treeTextPanel.setLayout(new GridLayout(2,1));
treeNumberOfCharactersLabel = new JLabel("Number of Characters: 0");
treeNumberOfBytesLabel = new JLabel("Number of Bytes: 0");
treeTextPanel.add(treeNumberOfCharactersLabel);
treeTextPanel.add(treeNumberOfBytesLabel);
outputTreePanel.add(treeTextPanel, BorderLayout.SOUTH);
// Compressed Output
outputCompressPanel = new JPanel();
outputCompressPanel.setBackground(Color.WHITE);
outputCompressPanel.setLayout(new BorderLayout());
outputCompressPanel.setBorder(new TitledBorder("Compressed Message"));
outputCompressArea = new JTextArea();
outputCompressArea.setEditable(false);
outputCompressArea.setLineWrap(true);
outputCompressArea.setFont(monoFont);
compressPane = new JScrollPane(outputCompressArea);
outputCompressPanel.add(compressPane);
outputTextPanel = new JPanel();
outputTextPanel.setLayout(new GridLayout(3,1));
outputNumberOfBytesLabel = new JLabel("Number of Bytes: 0");
outputTotalNumberOfBytesLabel = new JLabel("Total Number of Bytes: 0");
compressLabel = new JLabel("Compressed to 100% of the original size");
outputTextPanel.add(outputNumberOfBytesLabel);
outputTextPanel.add(outputTotalNumberOfBytesLabel);
outputTextPanel.add(compressLabel);
outputCompressPanel.add(outputTextPanel, BorderLayout.SOUTH);
// Decompress Output
outputDecompressPanel = new JPanel();
outputDecompressPanel.setBackground(Color.WHITE);
outputDecompressPanel.setLayout(new BorderLayout());
outputDecompressPanel.setBorder(new TitledBorder("Decompress Message"));
outputDecompressArea = new JTextArea();
outputDecompressArea.setEditable(false);
outputDecompressArea.setLineWrap(true);
outputDecompressArea.setFont(monoFont);
decompressPane = new JScrollPane(outputDecompressArea);
outputDecompressPanel.add(decompressPane);
add(inputTextAreaPanel);
add(outputTreePanel);
add(outputCompressPanel);
add(outputDecompressPanel);
}
private class InputKeyEvent implements KeyListener
{
public void keyPressed(KeyEvent arg0)
{
}
public void keyReleased(KeyEvent arg0)
{
/* Obtain the string from inputTextArea and
* calculate the number of bytes from its length.
* Assuming that we use unicode which is two bytes
* per character.
*/
String str = inputTextArea.getText();
int inputStringLength = str.length();
int inputStringBytes = str.length() * 2;
inputNumberOfCharactersLabel.setText("Number of Characters: " + inputStringLength);
inputNumberOfBytesLabel.setText("Number of Bytes: " + inputStringBytes);
/* Generate Huffman tree from the input string
* and obtain the root node of the Huffman tree.
*/
HuffmanTree ht = new HuffmanTree(str);
BinaryNodeInterface<Character> root = ht.getRootNode();
/* Generate a string representing the Huffman tree rooted
* at root and display the string on outputTreeArea.
*/
String treeString = CompressDecompress.getTreeString(root);
outputTreeArea.setText(treeString);
int treeStringLength = treeString.length();
int treeStringBytes = treeStringLength * 2;
treeNumberOfCharactersLabel.setText("Number of Characters: " + treeStringLength);
treeNumberOfBytesLabel.setText("Number of Bytes: " + treeStringBytes);
/* Compress the input string (str) using the Huffman tree rooted at
* root. The result is a new string containing just 0s and 1s. Then
* display the result on outputCompressArea.
*/
String compressedString = CompressDecompress.compress(root, str);
outputCompressArea.setText(compressedString);
int numBytes = compressedString.length() / 8;
if(compressedString.length() % 8 != 0)
{
numBytes++;
}
outputNumberOfBytesLabel.setText("Number of Bytes: " + numBytes);
outputTotalNumberOfBytesLabel.setText("Total Number of Bytes: " + (numBytes + treeStringBytes));
float percentCompression = (float) (numBytes + treeStringBytes) / inputStringBytes * 100;
compressLabel.setText("Compressed to " + String.format("%.2f", percentCompression) + "% of the original size");
/* Decompress the compressed string (compressedString) using
* the string representing the Huffman tree (treeString). The
* result is a new string which should be exactly the same
* as the input string (str). Then display the result string
* on outputDecompressArea.
*/
String decompressedString = CompressDecompress.decompress(treeString, compressedString);
outputDecompressArea.setText(decompressedString);
}
public void keyTyped(KeyEvent arg0)
{
}
}
public static void main(String[] args)
{
JFrame frame = new CompressDecompressGUI();
frame.setSize(700,600);
frame.setTitle("Huffman Tree - Compression / Decompression");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
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