TextReader


1   package JSci.io;
2   
3   import java.lang.Double  ;
4   import java.io.*;
5   import java.util.Vector  ;
6   
7   import JSci.maths.*;
8   
9   /**
10  * Text reader, reads data text files/streams.
11  * This class uses buffered I/O.
12  * @version 1.7
13  * @author Mark Hale
14  */
15  public final class TextReader extends InputStreamReader {
16          private final BufferedReader reader=new BufferedReader(this);
17          /**
18          * Reads text data from an input stream.
19          */
20          public TextReader(InputStream stream) {
21                  super(stream);
22          }
23          /**
24          * Reads a text file with the specified system dependent file name.
25          * @param name the system dependent file name.
26          * @exception FileNotFoundException If the file is not found.
27          */
28          public TextReader(String   name) throws FileNotFoundException {
29                  super(new FileInputStream(name));
30          }
31          /**
32          * Reads a text file with the specified File object.
33          * @param file the file to be opened for reading.
34          * @exception FileNotFoundException If the file is not found.
35          */
36          public TextReader(File file) throws FileNotFoundException {
37                  super(new FileInputStream(file));
38          }
39          /**
40          * Read a single character.
41          * @exception IOException If an I/O error occurs.
42          */
43          public int read() throws IOException {
44                  return reader.read();
45          }
46          /**
47          * Reads data to an array.
48          * @exception IOException If an I/O error occurs.
49          */
50          public double[][] readArray() throws IOException {
51                  final Vector   data=new Vector  (10);
52                  for(int ch=read();ch!='\n' && ch!=-1;) {
53                          if(isNumber(ch)) {
54                                  StringBuffer   str=new StringBuffer  ();
55                                  do {
56                                          str.append((char)ch);
57                                          ch=read();
58                                  } while(isNumber(ch));
59                                  data.addElement(str.toString());
60                          }
61                          while(!isNumber(ch) && ch!='\n' && ch!=-1)
62                                  ch=read();
63                  }
64                  int cols=data.size();
65                  int rows=1;
66                  for(int ch=read();ch!=-1;) {
67                          if(isNumber(ch)) {
68                                  StringBuffer   str=new StringBuffer  ();
69                                  do {
70                                          str.append((char)ch);
71                                          ch=read();
72                                  } while(isNumber(ch));
73                                  data.addElement(str.toString());
74                          }
75                          while(!isNumber(ch) && ch!='\n' && ch!=-1)
76                                  ch=read();
77                          if(ch=='\n') {
78                                  ch=read();
79                                  rows++;
80                          }
81                  }
82                  double array[][]=new double[rows][cols];
83                  for(int j,i=0;i<rows;i++) {
84                          for(j=0;j<cols;j++)
85                                  array[i][j]=Double.parseDouble(data.elementAt(i*cols+j).toString());
86                  }
87                  return array;
88          }
89          private boolean isNumber(int ch) {
90                  return Character.isDigit((char)ch) || ch=='.' || ch=='+' || ch=='-' || ch=='e' || ch=='E';
91          }
92  }
93  
94
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags