1
2 package org.codehaus.activemq.selector;
3
4 public class TokenMgrError extends Error {
5
6
7
8
9 /***
10 * Lexical error occured.
11 */
12 static final int LEXICAL_ERROR = 0;
13
14 /***
15 * An attempt wass made to create a second instance of a static token manager.
16 */
17 static final int STATIC_LEXER_ERROR = 1;
18
19 /***
20 * Tried to change to an invalid lexical state.
21 */
22 static final int INVALID_LEXICAL_STATE = 2;
23
24 /***
25 * Detected (and bailed out of) an infinite loop in the token manager.
26 */
27 static final int LOOP_DETECTED = 3;
28
29 /***
30 * Indicates the reason why the exception is thrown. It will have
31 * one of the above 4 values.
32 */
33 int errorCode;
34
35 /***
36 * Replaces unprintable characters by their espaced (or unicode escaped)
37 * equivalents in the given string
38 */
39 protected static final String addEscapes(String str) {
40 StringBuffer retval = new StringBuffer();
41 char ch;
42 for (int i = 0; i < str.length(); i++) {
43 switch (str.charAt(i)) {
44 case 0:
45 continue;
46 case '\b':
47 retval.append("//b");
48 continue;
49 case '\t':
50 retval.append("//t");
51 continue;
52 case '\n':
53 retval.append("//n");
54 continue;
55 case '\f':
56 retval.append("//f");
57 continue;
58 case '\r':
59 retval.append("//r");
60 continue;
61 case '\"':
62 retval.append("//\"");
63 continue;
64 case '\'':
65 retval.append("//\'");
66 continue;
67 case '//':
68 retval.append("////");
69 continue;
70 default:
71 if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
72 String s = "0000" + Integer.toString(ch, 16);
73 retval.append("//u" + s.substring(s.length() - 4, s.length()));
74 }
75 else {
76 retval.append(ch);
77 }
78 continue;
79 }
80 }
81 return retval.toString();
82 }
83
84 /***
85 * Returns a detailed message for the Error when it is thrown by the
86 * token manager to indicate a lexical error.
87 * Parameters :
88 * EOFSeen : indicates if EOF caused the lexicl error
89 * curLexState : lexical state in which this error occured
90 * errorLine : line number when the error occured
91 * errorColumn : column number when the error occured
92 * errorAfter : prefix that was seen before this error occured
93 * curchar : the offending character
94 * Note: You can customize the lexical error message by modifying this method.
95 */
96 private static final String LexicalError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar) {
97 return ("Lexical error at line " +
98 errorLine + ", column " +
99 errorColumn + ". Encountered: " +
100 (EOFSeen ? "<EOF> " : ("\"" + addEscapes(String.valueOf(curChar)) + "\"") + " (" + (int) curChar + "), ") +
101 "after : \"" + addEscapes(errorAfter) + "\"");
102 }
103
104 /***
105 * You can also modify the body of this method to customize your error messages.
106 * For example, cases like LOOP_DETECTED and INVALID_LEXICAL_STATE are not
107 * of end-users concern, so you can return something like :
108 * <p/>
109 * "Internal Error : Please file a bug report .... "
110 * <p/>
111 * from this method for such cases in the release version of your parser.
112 */
113 public String getMessage() {
114 return super.getMessage();
115 }
116
117
118
119
120
121 public TokenMgrError() {
122 }
123
124 public TokenMgrError(String message, int reason) {
125 super(message);
126 errorCode = reason;
127 }
128
129 public TokenMgrError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar, int reason) {
130 this(LexicalError(EOFSeen, lexState, errorLine, errorColumn, errorAfter, curChar), reason);
131 }
132 }