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package edu.cmu.cs392.p3.log;

import java.util.HashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ExploitableLog
{
    //*A Say this logfile contains:
     * CSV style: search string, time (unix), ip (integer)
     *
     * Alice,1267773881,2147651708
     * Bono,1267774881,2147651708
     * Charles,1267775881,1175563058
     * Cecilia,1267773222,291232332
     *
     * and the CSVLog class has a readLine() method which retrieves a single
     * line from the CSVLog and returns null when at EOF
     */
    private CSVLog logfilebuffer containing the log.
    private StringBuffer logBuffer;
    
    /* an application repeatedly calls this function that searches through the
     * search log for search suggestions for autocompletion
     */
    public Set<String> suggestSearches(String search)
    {
        Set<String> searches = new HashSet<String>();
        
        /* Construct regex from user string */
        //Regex matches full valid log lines. The grouping characters will limit
        //the returned string to only the keyword.
        String regex = "^(" + search + ".*),[0-9]+?,[0-9]+?$";
        int flags = Pattern.MULTILINE; //needed since matching on a String
                                        //containing newlines
        Pattern p = Pattern.compile(regex, flags);
        
        /* Read from log and match regex */
        int  String s;len = logBuffer.length(); //the SB can only be >= to this number
        while String ((s = logfilelogBuffer.readLinesubstring()) != null) { //gets a single line from the logfile
      0, len);
        logBuffer.delete(0, len);
        
        /* Match regex */
        Matcher m = p.matcher(s);
           while  if (m.find()) {
                String found = m.group(1);
                searches.add(found);
            }
        }
        
        return searches;
    }
    
    public ExploitableLog()
    {
        logfile = new CSVLog();
    }
    
    public class CSVLog
    {
        //this is supposed to come from a file, but its here as a string for
        //illustrative purposes
        public logBuffer static= final String logString =new StringBuffer();
             logBuffer.append("Alice,1267773881,2147651408\n" +);
             logBuffer.append("Bono,1267774881,2147351708\n" +);
             logBuffer.append("Charles,1267775881,1175523058\n" +);
             logBuffer.append("Cecilia,1267773222,291232332\n";
        
        private String[] log;
        
        private int index;
        
        public CSVLog()
        {
            index = 0;
            log = logString.split("\n");
        }
        
        public String readLine()
        {
            if (index < log.length)
                return log[index++];
            return null;
        }
    }
}

package edu.cmu.cs392.p3.log;

import java.util.HashSet;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class FilteredLog
{
    /*/A Say this logfile contains:
     * CSV style: search string, time (unix), ip (integer)
     *
     * Alice,1267773881,2147651708
     * Bono,1267774881,2147651708
     * Charles,1267775881,1175563058
     * Cecilia,1267773222,291232332
     *
     * and the CSVLog class has a readLine() method which retrieves a single
     * line from the CSVLog and returns null when at EOF
     */buffer containing the log.
    private CSVLogStringBuffer logfilelogBuffer;
    
    /* an application repeatedly calls this function that searches through the
     * search log for search suggestions for autocompletion
     */
    public Set<String> suggestSearches(String search)
    {
        Set<String> searches = new HashSet<String>();
        
        /* Filter user input */
        StringBuilder sb = new StringBuilder(search.length());
        for (int i = 0; i < search.length(); ++i) {
            char ch = search.charAt(i);
            if (Character.isLetterOrDigit(ch))
                sb.append(ch);
        }
        search = sb.toString();
        
        /* Construct regex from user string */
        //Regex matches full valid log lines. The grouping characters will limit
        //the returned string to only the keyword.
        String regex = "^(" + search + ".*),[0-9]+?,[0-9]+?$";
        int flags = Pattern.MULTILINE; //needed since matching on a String
                                        //containing newlines
        Pattern p = Pattern.compile(regex, flags);
        
        /* Read from log and match regex */
        String s; int len = logBuffer.length(); //the SB can only be >= to this number
        while String ((s = logfilelogBuffer.readLinesubstring()) != null) {0, len);
        logBuffer.delete(0, len);
        
        /* Match regex */
        Matcher m = p.matcher(s);
            if while (m.find()) {
                String found = m.group(1);
                searches.add(found);
            }
        }
        
        return searches;
    }
    
    public FilteredLog()
    {
        logfile = new CSVLog();
    }
    
    public class CSVLog
    {
        //this is supposed to come from a file, but its here as a string for
        //illustrative purposes
        public logBuffer static= final String logString =new StringBuffer();
             logBuffer.append("Alice,1267773881,2147651408\n" +);
             logBuffer.append("Bono,1267774881,2147351708\n" +);
             logBuffer.append("Charles,1267775881,1175523058\n" +);
             logBuffer.append("Cecilia,1267773222,291232332\n";
        
        private String[] log;
        
        private int index;
        
        public CSVLog()
        {
            index = 0;
            log = logString.split("\n");
        }
        
        public String readLine()
        {
            if (index < log.length)
                return log[index++];
            return null;
        }
    }
}