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1
9
10 package org.jboss.portal.format.parser.chars;
11
12 import java.io.IOException  ;
13 import java.io.Reader ;
14 import java.io.Writer ;
15
16
20 public class StackFilter implements Filter
21 {
22
23 private Filter[] stack = new Filter[0];
24
25 public StackFilter()
26 {
27 }
28
29 public void add(Filter filter)
30 {
31 Filter[] tmp = new Filter[1 + stack.length];
32 System.arraycopy(stack, 0, tmp, 1, stack.length);
33 tmp[0] = filter;
34 stack = tmp;
35 }
36
37 public void filter(Reader in, Writer out) throws IOException
38 {
39 int n = stack.length - 1;
40 if (n > 1)
41 {
42 MutableChars chars1 = new MutableChars();
43 stack[n].filter(in, chars1.getWriter());
44 MutableChars chars2 = new MutableChars();
45 while (n > 0)
46 {
47 stack[n].filter(chars1.getReader(), chars2.getWriter());
49 MutableChars tmp = chars1;
51 chars1 = chars2;
52 chars2 = tmp;
53 chars2.reset();
54 n--;
55 }
56 stack[0].filter(chars1.getReader(), out);
57 }
58 else if (n == 1)
59 {
60 MutableChars chars = new MutableChars();
61 stack[1].filter(in, chars.getWriter());
62 stack[0].filter(chars.getReader(), out);
63 }
64 else if (n == 0)
65 {
66 stack[0].filter(in, out);
67 }
68 }
69
70 }
71 |
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