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1   /*
2    * $Source: /usr/cvsroot/melati/maven-dsd-plugin/src/main/java/org/melati/poem/prepro/ParsingDSDException.java,v $
3    * $Revision: 1.14 $
4    *
5    * Copyright (C) 2000 William Chesters
6    *
7    * Part of Melati (http://melati.org), a framework for the rapid
8    * development of clean, maintainable web applications.
9    *
10   * Melati is free software; Permission is granted to copy, distribute
11   * and/or modify this software under the terms either:
12   *
13   * a) the GNU General Public License as published by the Free Software
14   *    Foundation; either version 2 of the License, or (at your option)
15   *    any later version,
16   *
17   *    or
18   *
19   * b) any version of the Melati Software License, as published
20   *    at http://melati.org
21   *
22   * You should have received a copy of the GNU General Public License and
23   * the Melati Software License along with this program;
24   * if not, write to the Free Software Foundation, Inc.,
25   * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the
26   * GNU General Public License and visit http://melati.org to obtain the
27   * Melati Software License.
28   *
29   * Feel free to contact the Developers of Melati (http://melati.org),
30   * if you would like to work out a different arrangement than the options
31   * outlined here.  It is our intention to allow Melati to be used by as
32   * wide an audience as possible.
33   *
34   * This program is distributed in the hope that it will be useful,
35   * but WITHOUT ANY WARRANTY; without even the implied warranty of
36   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
37   * GNU General Public License for more details.
38   *
39   * Contact details for copyright holder:
40   *
41   *     William Chesters <williamc At paneris.org>
42   *     http://paneris.org/~williamc
43   *     Obrechtstraat 114, 2517VX Den Haag, The Netherlands
44   */
45  
46  package org.melati.poem.prepro;
47  
48  import java.io.StreamTokenizer;
49  
50  
51  /**
52   * Thrown when an unexpected token is encountered during parsing.
53   * Accommodates following  types of error. 
54   * Syntactic assertion failures where the tokens found do not match 
55   * those expected.
56   * Vocabulary failures where values are outside the token set.
57   * Model violations where legal expressions cannot actually be 
58   * implemented, such as String troid columns.
59   * Limitations on tables which must be either abstract or populated 
60   * and must not hide a table in this or an imported DSD.     
61   */
62  class ParsingDSDException extends RuntimeException {
63  
64    String expected, got;
65    int lineNumber;
66    String message;
67    FieldDef field = null;
68  
69    /**
70     * Constructor.
71     */
72    ParsingDSDException() {
73      super();
74    }
75  
76    ParsingDSDException(String expected, String got) {
77      this.expected = expected;
78      this.got = "\"" + got + "\"";
79    }
80  
81    ParsingDSDException(String expected, StreamTokenizer got) {
82      this.expected = expected;
83      this.got = "\"" + got.toString() + "\"";
84      this.lineNumber = got.lineno();
85    }
86  
87    ParsingDSDException(String expected, 
88                        String got, StreamTokenizer context) {
89      this.expected = expected;
90      this.got = "\"" + got + "\" near " + context.toString();
91      this.lineNumber = context.lineno();
92    }
93  
94    ParsingDSDException(int lineNo, String error) {
95      this.message = error;
96      this.lineNumber = lineNo;
97    }
98  
99    /** @return the message */
100   public String getMessage() {
101     String returnString = "";
102     if (lineNumber != 0)
103       returnString = "Definition ending on line " + lineNumber + ": ";
104     if (expected != null)
105       returnString = returnString + "Expected \"" + expected + 
106          "\" but got " + got + "\n";
107     if (message != null)
108       returnString = returnString + message;
109     return returnString;
110   }
111 }