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LinkFilter.java | 0% | 0% | 0% | 0% |
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1 | /* | |
2 | * Copyright (c) 2001-2004, | |
3 | * RedVerst Group, ISP RAS http://www.ispras.ru | |
4 | * All rights reserved. | |
5 | * | |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions are met: | |
8 | * | |
9 | * 1. Redistributions of source code must retain the above copyright notice, this | |
10 | * list of conditions and the following disclaimer. | |
11 | * | |
12 | * 2. Redistributions in binary form must reproduce the above copyright notice, | |
13 | * this list of conditions and the following disclaimer in the documentation | |
14 | * and/or other materials provided with the distribution. | |
15 | * | |
16 | * 3. The names "ATP", "TreeDL", "RedVerst", "ISP RAS" | |
17 | * may not be used to endorse or promote products derived from this software | |
18 | * without specific prior written permission. | |
19 | * | |
20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND | |
21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
22 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
23 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR | |
24 | * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
25 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
26 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON | |
27 | * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
28 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
29 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
30 | */ | |
31 | ||
32 | package com.unitesk.atp.tree.tool.antlr; | |
33 | ||
34 | import antlr.Token; | |
35 | import antlr.TokenStream; | |
36 | import antlr.TokenStreamException; | |
37 | ||
38 | /** | |
39 | * Token stream filter that links tokens into chain | |
40 | * | |
41 | * @author <A href="mailto:demakov@ispras.ru">Alexey Demakov</A> | |
42 | * @version $Id: LinkFilter.java,v 1.2 2006/02/13 14:57:20 all-x Exp $ | |
43 | */ | |
44 | public class LinkFilter implements TokenStream | |
45 | { | |
46 | protected TokenStream src; | |
47 | protected LinkedToken first; | |
48 | protected LinkedToken last; | |
49 | ||
50 | 0 | public LinkFilter( TokenStream src ) |
51 | { | |
52 | 0 | this.src = src; |
53 | } | |
54 | ||
55 | 0 | public Token nextToken() throws TokenStreamException |
56 | { | |
57 | 0 | LinkedToken t = (LinkedToken)src.nextToken(); |
58 | 0 | if( last != null ) |
59 | { | |
60 | 0 | last.setNextToken( t ); |
61 | 0 | t.setPrevToken( last ); |
62 | } else { | |
63 | 0 | first = t; |
64 | } | |
65 | 0 | last = t; |
66 | 0 | return t; |
67 | } | |
68 | ||
69 | /** | |
70 | * Returns the first token of chain. | |
71 | */ | |
72 | 0 | public LinkedToken getFirstToken() |
73 | { | |
74 | 0 | return first; |
75 | } | |
76 | ||
77 | /** | |
78 | * Returns the last token of chain. | |
79 | */ | |
80 | 0 | public LinkedToken getLastToken() |
81 | { | |
82 | 0 | return last; |
83 | } | |
84 | } |
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