CommaReader.java

				
//**************************************
// Name: CommaReader.java
// Description:Extend BufferedReader to read a comma delineated file.
// By: Paul R. Richards
//
// Inputs:comma delineated text file
//
//This code is copyrighted and has// limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=3340&lngWId=2//for details.//**************************************

import java.util.*;
import java.io.*;
// Extend BufferedReader to parse comma-delineated files
/* Example usage:
try {
File fl = new File("data.txt");
FileReader fileReader = new FileReader(fl);
bufferedReader = new CommaReader(fileReader);
while (true) {
 if (bufferedReader.eof()) break;
 System.out.println ( bufferedReader.readToken());
}
} catch (Exception e) { 
System.out.println ("Error: " + e ); 
}
*/
public class CommaReader extends BufferedReader {
// Return true if the specified String can be interpretted
// as a base 10 number.
public static boolean isNumeric ( String token ) { 
 boolean ok = false;
 try {
double i = Double.valueOf ( token ).doubleValue();
ok = true;
 } catch (Exception e) { }
 return ok;
}
CommaReader ( Reader in ) {
 super ( in );
}
// return true if we are at the end of the buffer.
public boolean eof () { 
 int ch;
 try {
mark(100);
ch = read();
if (ch == -1) return true;
reset();
 } catch (Exception e) { 
return true;
 }
 return false;
}
public String readToken () { 
 String token = "";
 char c;
 int ch;
 try {
while ( true ) { 
 ch = read();
 if (ch == -1) break;
 if (ch == ',') break;
 c = (char) ch;
 token += Character.toString (c);
} 
 } catch (Exception e) {
return token; 
 }
 return token;
}
public String nextToken () { 
 String token = "";
 try {
mark(100);
token = readToken();
reset();
 } catch (Exception e) { }
 return token;
}
public double readNumber () { 
 String token = readToken ();
 double number = 0.0; 
 try {
number = Double.valueOf ( token ).doubleValue();
 } catch (Exception e) { }
 return number;
}
public int readByte () { 
 return (int) readNumber();
}
public int readSignedByte() { 
 int total = readByte();
 if (total >= 128) // Sign bit is set
total = total - 256; 
 return total;
} 
public int readSignedWord() { 
 int total = readWord();
 if (total >= 32768) // Sign bit is set
total = total - 65536; 
 return total;
}
public int readWord() { 
 int total = readByte();
 if (eof()) return 0;
 total = (total * 256) + readByte();
 return total;
}
 }