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1 | /******************************************************************************* |
2 | * Copyright (c) 2013 Ericsson | |
3 | * | |
4 | * All rights reserved. This program and the accompanying materials are made | |
5 | * available under the terms of the Eclipse Public License v1.0 which | |
6 | * accompanies this distribution, and is available at | |
7 | * http://www.eclipse.org/legal/epl-v10.html | |
8 | * | |
9 | * Contributors: | |
10 | * Alexandre Montplaisir - Initial API and implementation | |
11 | * Matthew Khouzam - Addition to have more descriptive errors | |
12 | *******************************************************************************/ | |
13 | ||
14 | package org.eclipse.linuxtools.internal.ctf.core.event.metadata.exceptions; | |
15 | ||
16 | import java.lang.reflect.Field; | |
17 | ||
18 | import org.antlr.runtime.MismatchedTokenException; | |
19 | import org.antlr.runtime.RecognitionException; | |
20 | import org.eclipse.linuxtools.ctf.core.trace.CTFReaderException; | |
21 | import org.eclipse.linuxtools.ctf.parser.CTFLexer; | |
22 | ||
23 | /** | |
24 | * CTF Reader exception but dealing with Antlr-specific parsing problems. | |
25 | * | |
26 | * It is separated from the main {@link CTFReaderException} - and is not part of | |
27 | * the API - to isolate the Antlr-specific classes and avoid pushing that | |
28 | * dependency to the users of this plugin. | |
29 | * | |
30 | * @author Matthew Khouzam | |
31 | */ | |
32 | public class CtfAntlrException extends CTFReaderException { | |
33 | ||
34 | private static final long serialVersionUID = -7078624493350073777L; | |
35 | ||
36 | private int fErrorLine = -1; | |
37 | private String fFile = ""; //$NON-NLS-1$ | |
38 | private String fExpectingName = ""; //$NON-NLS-1$ | |
39 | private int fExpectedValue = -1; | |
40 | private String fActualName = ""; //$NON-NLS-1$ | |
41 | private int fActualValue = -1; | |
42 | ||
43 | ||
44 | /** | |
45 | * Re-throw the exception but read its data | |
46 | * | |
47 | * @param e | |
48 | * the previous recognition exception (Antlr specific) | |
49 | */ | |
50 | public CtfAntlrException(RecognitionException e) { | |
51 | super(e); | |
52 | this.fErrorLine = e.line; | |
53 | this.fFile = "metadata"; //$NON-NLS-1$ // we're in CTF, the only thing using antlr is metadata | |
54 | } | |
55 | ||
56 | /** | |
57 | * Re-throw the exception but read its data | |
58 | * | |
59 | * @param e | |
60 | * the previous recognition exception (Antlr specific) | |
61 | */ | |
62 | public CtfAntlrException(MismatchedTokenException e){ | |
63 | super(e); | |
64 | this.fErrorLine = e.line; | |
65 | this.fFile = "metadata"; //$NON-NLS-1$ // we're in CTF, the only thing using antlr is metadata | |
66 | parseMismatchedException(e); | |
67 | } | |
68 | ||
69 | private void parseMismatchedException(MismatchedTokenException m) { | |
70 | // Iterate through the tokens that are hidden in the CTFLexer | |
71 | // They are private static final int fields. | |
72 | for (Field f : CTFLexer.class.getDeclaredFields()) { | |
73 | f.setAccessible(true); | |
74 | String name; | |
75 | int value; | |
76 | try { | |
77 | name = f.getName(); | |
78 | final boolean isInt = (f.getType().isPrimitive()); | |
79 | if (isInt) { | |
80 | value = ((Integer) f.get(null)).intValue(); | |
81 | if (value == m.expecting) { | |
82 | this.fExpectingName = name; | |
83 | this.fExpectedValue = value; | |
84 | } | |
85 | if (value == m.c) { | |
86 | this.fActualName = name; | |
87 | this.fActualValue = value; | |
88 | } | |
89 | } | |
90 | } catch (NullPointerException e1) { | |
91 | // Pokemon, gotta catch em all! | |
92 | // actually useful since f may not have a | |
93 | // value | |
94 | } catch (IllegalArgumentException e1) { | |
95 | // Catch these exceptions (reflexion) | |
96 | } catch (IllegalAccessException e1) { | |
97 | // Catch these exceptions (reflexion) | |
98 | } | |
99 | if (!this.fExpectingName.isEmpty() && !this.fActualName.isEmpty()) { | |
100 | return; | |
101 | } | |
102 | } | |
103 | } | |
104 | ||
105 | @Override | |
106 | public String getMessage() { | |
107 | final String message = super.getMessage(); | |
108 | if (fErrorLine == -1) { | |
109 | return message; | |
110 | } | |
111 | String expected = "" + this.fExpectedValue; //$NON-NLS-1$ | |
112 | String actual = "" + this.fActualValue; //$NON-NLS-1$ | |
113 | String newMessage = message.replaceAll(expected, this.fExpectingName); | |
114 | newMessage = newMessage.replaceAll(actual, this.fActualName); | |
115 | return newMessage + " at " + fFile + ":" + fErrorLine; //$NON-NLS-1$ //$NON-NLS-2$ | |
116 | } | |
117 | ||
118 | } |