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1 | /* | |
2 | * EscapedStringTokenizer.java | |
3 | * | |
4 | * Created on 2006/12/16, 5:41pm | |
5 | * | |
6 | * Copyright (c) 2006, University of Kent | |
7 | * All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions are met: | |
11 | * | |
12 | * Redistributions of source code must retain the above copyright notice, this | |
13 | * list of conditions and the following disclaimer. | |
14 | * | |
15 | * Redistributions in binary form must reproduce the above copyright notice, | |
16 | * this list of conditions and the following disclaimer in the documentation | |
17 | * and/or other materials provided with the distribution. | |
18 | * | |
19 | * 1. Neither the name of the University of Kent nor the names of its | |
20 | * contributors may be used to endorse or promote products derived from this | |
21 | * software without specific prior written permission. | |
22 | * | |
23 | * 2. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
24 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
25 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
26 | * PURPOSE ARE DISCLAIMED. | |
27 | * | |
28 | * 3. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
29 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
34 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
35 | * POSSIBILITY OF SUCH DAMAGE. | |
36 | * | |
37 | * 4. YOU AGREE THAT THE EXCLUSIONS IN PARAGRAPHS 2 AND 3 ABOVE ARE REASONABLE | |
38 | * IN THE CIRCUMSTANCES. IN PARTICULAR, YOU ACKNOWLEDGE (1) THAT THIS | |
39 | * SOFTWARE HAS BEEN MADE AVAILABLE TO YOU FREE OF CHARGE, (2) THAT THIS | |
40 | * SOFTWARE IS NOT "PRODUCT" QUALITY, BUT HAS BEEN PRODUCED BY A RESEARCH | |
41 | * GROUP WHO DESIRE TO MAKE THIS SOFTWARE FREELY AVAILABLE TO PEOPLE WHO WISH | |
42 | * TO USE IT, AND (3) THAT BECAUSE THIS SOFTWARE IS NOT OF "PRODUCT" QUALITY | |
43 | * IT IS INEVITABLE THAT THERE WILL BE BUGS AND ERRORS, AND POSSIBLY MORE | |
44 | * SERIOUS FAULTS, IN THIS SOFTWARE. | |
45 | * | |
46 | * 5. This license is governed, except to the extent that local laws | |
47 | * necessarily apply, by the laws of England and Wales. | |
48 | * | |
49 | * Author : Gansen Zhao | |
50 | * Email: gz7@kent.ac.uk | |
51 | * | |
52 | */ | |
53 | ||
54 | package issrg.pba.rbac.xmlpolicy; | |
55 | ||
56 | import java.util.Enumeration; | |
57 | ||
58 | /** | |
59 | * | |
60 | * @author gansen | |
61 | */ | |
62 | public class EscapedStringTokenizer implements Enumeration{ | |
63 | ||
64 | String m_str; | |
65 | char m_delim; | |
66 | int m_curpos; | |
67 | /** Creates a new instance of EscapedStringTokenizer */ | |
68 | 181 | public EscapedStringTokenizer(String strTobeSplit, char delim) { |
69 | 181 | m_str=strTobeSplit; |
70 | 181 | m_delim=delim; |
71 | 181 | m_curpos=0; |
72 | } | |
73 | ||
74 | 575 | private int nextDelimPosition(){ |
75 | ||
76 | ||
77 | 575 | boolean bIsOddAppearance=false; |
78 | 575 | boolean bNonDelim=false; |
79 | ||
80 | //check from current position to find the next delim. | |
81 | 3903 | for(int i=m_curpos;i<m_str.length();i++) |
82 | 3360 | if(m_str.charAt(i)==m_delim){ |
83 | 46 | bIsOddAppearance=!bIsOddAppearance; |
84 | 3314 | }else if(bIsOddAppearance==true){ |
85 | // we have found a odd number of delims, and its's also the end of the delim sequences | |
86 | //thus the current position is the end. | |
87 | 32 | return i; |
88 | } | |
89 | 543 | return m_str.length(); |
90 | } | |
91 | ||
92 | 378 | public boolean hasMoreElements() { |
93 | ||
94 | 378 | int i =0; |
95 | 378 | i = this.nextDelimPosition(); |
96 | 378 | if(i>this.m_curpos) |
97 | 197 | return true; |
98 | 181 | return false; |
99 | } | |
100 | ||
101 | 197 | public Object nextElement() { |
102 | ||
103 | 197 | Object obj=null; |
104 | 197 | boolean bIsOddAppearance=false; |
105 | ||
106 | 197 | int next = this.nextDelimPosition(); |
107 | ||
108 | 197 | String nextE=""; |
109 | ||
110 | 1861 | for(int i = this.m_curpos; i<next; i++){ |
111 | 1664 | if(m_str.charAt(i)!=m_delim) |
112 | 1641 | if((this.m_curpos>0)&&(i == this.m_curpos)&&(m_str.charAt(i)==' ')){//if the first charactor is white space |
113 | //do nothing here | |
114 | }else{//otherwise | |
115 | 1641 | nextE=nextE+m_str.charAt(i); |
116 | } | |
117 | else{ | |
118 | 23 | bIsOddAppearance=!bIsOddAppearance; |
119 | 23 | if(bIsOddAppearance==false) |
120 | 2 | nextE=nextE+m_str.charAt(i); |
121 | } | |
122 | } | |
123 | ||
124 | ||
125 | 197 | this.m_curpos=next; |
126 | 197 | return obj=nextE; |
127 | ||
128 | } | |
129 | ||
130 | ||
131 | ||
132 | } |
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