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1 package org.jical;
2
3
11 import java.io.Reader  ;
12 import java.util.Iterator ;
13 import java.util.List ;
14 import java.util.ArrayList ;
15
16 public class UnfoldingLineIterator implements Iterator {
17
18 private Iterator m_iterator;
19 private List m_lines = new ArrayList ();
20
21 public UnfoldingLineIterator( Reader reader ) {
22 this( new LineIterator( reader ) );
23 }
24 public UnfoldingLineIterator( Iterator iterator ) {
25 m_iterator = iterator;
26 }
27
28 public boolean hasNext() {
29 checkLines();
30 return ( !m_lines.isEmpty() );
31 }
32 public Object next() {
33 if ( hasNext() ) {
34 return m_lines.remove( 0 );
35 }
36 return null;
37 }
38 public void remove() throws UnsupportedOperationException {
39 throw new UnsupportedOperationException ();
40 }
41
42
43
44 private void checkLines() {
45 synchronized ( m_lines ) {
46 if ( m_lines.size() < 2 && m_iterator.hasNext() ) {
47 StringBuffer line = (StringBuffer ) m_iterator.next();
48 if ( line != null ) {
49 m_lines.add( line );
50 unfoldLines();
51 checkLines();
52 }
53 }
54 }
55 }
56
57 private void unfoldLines() {
58 synchronized ( m_lines ) {
59 int i = 1;
60 while ( i < m_lines.size() ) {
61 StringBuffer line = (StringBuffer ) m_lines.get( i );
62 char c = line.charAt( 0 );
63 if ( c == ' ' || c == '\t' ) {
64 m_lines.remove( i );
65 StringBuffer pline = (StringBuffer ) m_lines.get( i - 1 );
66 line.deleteCharAt( 0 );
67 pline.append( line );
68 } else {
69 i++;
70 }
71 }
72 }
73 }
74
75
76 }
77
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Java API By Example, From Geeks To Geeks.