/*
 * PalindromeApplet.java
 *
 * Created on January 29, 2005, 4:46 PM
 */

/**
 *
 * @author  levenick
 */
public class PalindromeApplet extends java.applet.Applet {
    
    /** Initializes the applet PalindromeApplet */
    public void init() {
        initComponents();
    }
    
    boolean isPalindromic(String s) {
        s = s.toLowerCase();
        String filteredS = "";
        
        for (int i=0; i<s.length(); i++)
            if (Character.isLetter(s.charAt(i)))
                filteredS += s.charAt(i);

        return isPalindrome(filteredS);
    }    
    
    boolean isPalindromic2(String s) {
        s = s.toLowerCase();
        int leftIndex = 0;
        int rightIndex = s.length()-1;

        while (leftIndex < rightIndex 
                 && s.charAt(leftIndex) == s.charAt(rightIndex)) {
            leftIndex++;
            rightIndex--;
            while (!Character.isLetter(s.charAt(leftIndex)))
                leftIndex++;
            while (!Character.isLetter(s.charAt(rightIndex)))
                rightIndex--;
        }

        return leftIndex >= rightIndex;
    }    
    
    boolean isPalindrome(String s) {
        int leftIndex = 0;
        int rightIndex = s.length()-1;

        while (leftIndex < rightIndex 
                 && s.charAt(leftIndex) == s.charAt(rightIndex)) {
            leftIndex++;
            rightIndex--;
        }

        return leftIndex >= rightIndex;
    }    
    /** This method is called from within the init() method to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    private void initComponents() {//GEN-BEGIN:initComponents
        answerTF = new java.awt.TextField();
        inputTF = new java.awt.TextField();

        setLayout(null);

        answerTF.setText(" ");
        add(answerTF);
        answerTF.setBounds(70, 150, 240, 20);

        inputTF.setText("racecar");
        inputTF.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                inputTFActionPerformed(evt);
            }
        });

        add(inputTF);
        inputTF.setBounds(60, 30, 260, 20);

    }//GEN-END:initComponents

    private void inputTFActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_inputTFActionPerformed
        if (isPalindromic(inputTF.getText()))
            answerTF.setText("yes");
        else answerTF.setText("nope");
    }//GEN-LAST:event_inputTFActionPerformed
    
    
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private java.awt.TextField answerTF;
    private java.awt.TextField inputTF;
    // End of variables declaration//GEN-END:variables
    
}