/*
 * BinaryStringMatchUI.java
 *
 */


public class BinaryStringMatchUI extends javax.swing.JFrame {
    int m;                  // length of p - variable name picked because of use in text
    int n;                  // length of text - variable name picked because of use in text
    int [] f;               // Failure function as defined in 9.1
    int [] bfail;            // Failure function as defined in 9.1, modified for binary input 
    char one=' ';                // one of two characters in binary pattern 
    char two=' ';                // second of two characters in binary pattern
    String patternString;   // pattern to be found in bigString
    char [] p;              // pattern to be found in bigString in char form
    String bigString;       // big String to be searched for patternString
    char [] big;            // bigString in char form
  
    /** Creates new form BinaryStringMatchUI */
    public BinaryStringMatchUI() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        OutputFailureFunctions = new javax.swing.JTextArea();
        TextStr = new javax.swing.JTextField();
        PatternStr = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        RunMatch = new javax.swing.JToggleButton();
        jScrollPane3 = new javax.swing.JScrollPane();
        OutputArea = new javax.swing.JTextArea();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        OutputFailureFunctions.setColumns(20);
        OutputFailureFunctions.setRows(5);
        jScrollPane1.setViewportView(OutputFailureFunctions);

        TextStr.setText("xxyxxyxxxxyxyxyxxyxxyxyxyxxxyxxyxxyxxxyxyxyxxxyxxyxyxyxy");
        TextStr.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                TextStrActionPerformed(evt);
            }
        });

        PatternStr.setText("xxyxxyxyxyxy");

        jLabel1.setText("Text");

        jLabel2.setText("Pattern");

        RunMatch.setText("RunMatch");
        RunMatch.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                RunMatchActionPerformed(evt);
            }
        });

        OutputArea.setColumns(20);
        OutputArea.setRows(5);
        OutputArea.setText("Output");
        jScrollPane3.setViewportView(OutputArea);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jScrollPane3, javax.swing.GroupLayout.DEFAULT_SIZE, 481, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(PatternStr)
                            .addComponent(TextStr, javax.swing.GroupLayout.DEFAULT_SIZE, 390, Short.MAX_VALUE))
                        .addGap(18, 18, 18)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel1)
                                .addGap(18, 18, 18)
                                .addComponent(RunMatch))
                            .addComponent(jLabel2))))
                .addGap(0, 0, 0))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(TextStr, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel1)
                    .addComponent(RunMatch))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(PatternStr, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel2))
                .addGap(22, 22, 22)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(34, 34, 34)
                        .addComponent(jScrollPane3, javax.swing.GroupLayout.DEFAULT_SIZE, 198, Short.MAX_VALUE))
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 232, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(60, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

private void TextStrActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_TextStrActionPerformed
// TODO add your handling code here:
}//GEN-LAST:event_TextStrActionPerformed


// Determine if the pattern is found in the big string
public void findIt()
   {
     OutputArea.append("findIt\n");
     patternString = PatternStr.getText();
     m = patternString.length();
     OutputArea.append("Pattern is of length " + m +"\n");
     p = new char[m+1];
     patternString.getChars(0,m,p,0);
     bigString = TextStr.getText();
     n = bigString.length();
     big = new char[n+1];
     bigString.getChars(0,n,big,0);  
     bfail = new int[m+1];
     f = new int[m+1];
     one=two = '*';
     long start = System.currentTimeMillis();
     if(!checkBinary(p,m) || !checkBinary(big,n)) System.out.println("ERROR not binary");
     else {
    	createBfail();
        printBfail();
        int where = findMatchBruteForce();
        if (where >=0) 
        {
            OutputArea.append("Did find a match\n");
            displayString(where,m);
        }
        else OutputArea.append("Did NOT find a match\n");
     }
     long elapsedTimeMillis = System.currentTimeMillis()-start;
     OutputArea.append("\nTime taken " +  elapsedTimeMillis+"\n");
  }

// Print out the big string with the pattern shown between double asterisks
  public void displayString(int beg, int howMany)
  {    System.out.println(beg + " "+ howMany + " " + n + "\n");
       OutputArea.append(bigString.substring(0,beg) + "**");
       OutputArea.append(bigString.substring(beg,beg+howMany)+"**");
       OutputArea.append(bigString.substring(beg+howMany,bigString.length()));
      
  }
 // Given a character in the pattern, return the other character 
  char opposite(char a){
  	  if (a==one) return two;
  	  return one;
  }
 
  // Create the binary fail function bfail
  public void createBfail()
  { int i,b;
   f[0] = 0;
   for(i=0; i< m-1; i++)
     { b = f[i]; bfail[i]=0;
       while(b > 0 && p[i+1] != p[b])
          b = f[b-1]; // so b is decreased by at least 1 here; therefore the while loop terminates
       if(p[i+1] == p[b])
          f[i+1] = b+1;
       else
          f[i+1] = 0;
     }
}

  // Make sure the string contains only two characters
  // Store the two characters as variables one and two
  public boolean checkBinary( char [] s, int len){
  	  if (one=='*') one =two =s[0];
  	  for (int i=0; i < len; i++)
  	  { if (s[i]!= one){
  	       if (two==one) two = s[i];
  	       if (s[i]!=two) {
  	       	 OutputArea.append("checkBinary Value " + s[i] + 
  	       	     " different from "+ one + " or " + two +"\n");
  	       	 return false;
  	       	}
  	     }
      }
      return true;
  }
  
  // Return the location of the match of pattern p in text string big
  // Return -1 if there is no match.
  public int findMatchBruteForce() { 

	  // You need to create an intelligent binary findMatch
      for (int i=0; i <= n - m; i++)
      { int j = 0;
        while (j < m && big[i+j]==p[j])
        {
            j++;
        }
        if (j==m) return i;
      
      }

      return -1;
  }

  // Print the binary Fail functions
  public void printBfail(){
       OutputFailureFunctions.setTabSize(4);
       OutputFailureFunctions.append("\ti\tp[i]\tBfail\t F \n");
    for (int i=0; i < m; i++)
       OutputFailureFunctions.append("\t"+ i + "\t" + p[i] + "\t" +bfail[i]+ "\t"  + f[i]+"\n");
  }



private void RunMatchActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_RunMatchActionPerformed
// TODO add your handling code here:
//Add the code to do the String Match
    OutputArea.setText("String is " + TextStr.getText()+"\n");
    OutputArea.append("Pattern is " + PatternStr.getText()+"\n");
    patternString = PatternStr.getText();
    bigString = TextStr.getText();
    System.out.println("Find it  " + patternString + "->" + bigString);
    OutputArea.append("Find it  " + patternString + "->" + bigString + "\n");
    findIt();
}//GEN-LAST:event_RunMatchActionPerformed

    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new BinaryStringMatchUI().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JTextArea OutputArea;
    private javax.swing.JTextArea OutputFailureFunctions;
    private javax.swing.JTextField PatternStr;
    private javax.swing.JToggleButton RunMatch;
    private javax.swing.JTextField TextStr;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane3;
    // End of variables declaration//GEN-END:variables
    
    
}