Yurttas/PL/OOL/Java/F/09/02/01/00/InputFile.java

 1import java.awt.*;
 2import java.io.*;
 3
 4public class InputFile {
 5
 6  RandomAccessFile f = null;
 7  boolean errflag;
 8  String s = null;
 9
10  public InputFile(String fname) {
11    errflag = false;
12    try {
13      //open file
14      f = new RandomAccessFile(fname, "r");
15    }
16    catch(IOException e) {
17      // print error if not found
18      System.out.println("no file found");
19      errflag = true;    //and set flag
20    }
21  }
22
23  public boolean checkErr() {
24    return errflag;
25  }
26
27  public String read() {
28    //read a single field up to a comma or end of line
29    String ret = "";
30    if(s==null)          //if no data in string
31    {
32      s = readLine();    //read next line
33    }
34    if(s!=null)          //if there is data
35    {
36      s.trim();              //trim off blanks
37      int i = s.indexOf(",");  //find next comma
38      if(i<=0)
39      {
40        ret = s.trim();       //if no commas go to end of line
41        s = null;             //and null out stored string
42      }
43      else {
44        ret = s.substring(0, i).trim(); //return left of comma      
45        s = s.substring(i+1); //save right of comma
46      }
47    }
48    else
49      ret = null;
50    return ret;             //return string
51  }
52
53  public String readLine() {
54    //read in a line from the file
55    s = null;
56    try {
57      s = f.readLine();     //could throw error
58    }
59    catch(IOException e) {
60      errflag = true;
61      System.out.println("File read error");
62    }
63    return s;
64  }
65
66  public void close() {
67    try {
68      f.close();     //close file
69    }
70    catch(IOException e) {
71      System.out.println("File close error");
72      errflag = true;
73    }
74  }
75
76}