|
1 package org.jical;
2
3 import java.io.IOException  ;
4 import java.io.InputStream ;
5 import java.io.InputStreamReader ;
6 import java.io.BufferedReader ;
7 import java.io.Reader ;
8 import java.io.UnsupportedEncodingException ;
9 import java.util.Iterator ;
10 import java.util.List ;
11 import java.util.ArrayList ;
12
13 public class LineIterator implements Iterator {
14
15 private BufferedReader m_reader;
16 private List m_lines = new ArrayList ();
17
18 public LineIterator( InputStream stream ) {
19 this( new InputStreamReader ( stream ) );
20 }
21 public LineIterator( InputStream stream, String enc ) throws UnsupportedEncodingException {
22 this( new InputStreamReader ( stream, enc ) );
23 }
24 public LineIterator( Reader reader ) {
25 if ( reader instanceof BufferedReader ) {
26 m_reader = (BufferedReader ) reader;
27 } else {
28 m_reader = new BufferedReader ( reader );
29 }
30 }
31
32 public boolean hasNext() {
33 checkLines();
34 return ( !m_lines.isEmpty() );
35 }
36 public Object next() {
37 if ( hasNext() ) {
38 return m_lines.remove( 0 );
39 }
40 return null;
41 }
42 public void remove() throws UnsupportedOperationException {
43 throw new UnsupportedOperationException ();
44 }
45
46
47 private void checkLines() {
48 synchronized ( m_lines ) {
49 if ( (m_lines.size()) < 1 && (m_reader != null) ) {
50 try {
51 String line = m_reader.readLine();
52 if ( line != null ) {
53 m_lines.add( new StringBuffer ( line ) );
54 checkLines();
55 } else {
56 m_reader.close();
57 m_reader = null;
58 }
59 }
60 catch ( IOException ex ) {
61 ex.printStackTrace();
62 }
63 }
64 }
65 }
66 }
67 |
Popular Tags |
Java API By Example, From Geeks To Geeks.