Source Code Cross Referenced for ParseException.java in  » RSS-RDF » sesame » org » openrdf » query » parser » sparql » ast » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » RSS RDF » sesame » org.openrdf.query.parser.sparql.ast 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
002:        package org.openrdf.query.parser.sparql.ast;
003:
004:        /**
005:         * This exception is thrown when parse errors are encountered. You can
006:         * explicitly create objects of this exception type by calling the method
007:         * generateParseException in the generated parser. You can modify this class to
008:         * customize your error reporting mechanisms so long as you retain the public
009:         * fields.
010:         */
011:        public class ParseException extends Exception {
012:
013:            /**
014:             * This constructor is used by the method "generateParseException" in the
015:             * generated parser. Calling this constructor generates a new object of this
016:             * type with the fields "currentToken", "expectedTokenSequences", and
017:             * "tokenImage" set. The boolean flag "specialConstructor" is also set to
018:             * true to indicate that this constructor was used to create this object.
019:             * This constructor calls its super class with the empty string to force the
020:             * "toString" method of parent class "Throwable" to print the error message
021:             * in the form: ParseException: <result of getMessage>
022:             */
023:            public ParseException(Token currentTokenVal,
024:                    int[][] expectedTokenSequencesVal, String[] tokenImageVal) {
025:                super ("");
026:                specialConstructor = true;
027:                currentToken = currentTokenVal;
028:                expectedTokenSequences = expectedTokenSequencesVal;
029:                tokenImage = tokenImageVal;
030:            }
031:
032:            /**
033:             * The following constructors are for use by you for whatever purpose you can
034:             * think of. Constructing the exception in this manner makes the exception
035:             * behave in the normal way - i.e., as documented in the class "Throwable".
036:             * The fields "errorToken", "expectedTokenSequences", and "tokenImage" do not
037:             * contain relevant information. The JavaCC generated code does not use these
038:             * constructors.
039:             */
040:
041:            public ParseException() {
042:                super ();
043:                specialConstructor = false;
044:            }
045:
046:            public ParseException(String message) {
047:                super (message);
048:                specialConstructor = false;
049:            }
050:
051:            /**
052:             * This variable determines which constructor was used to create this object
053:             * and thereby affects the semantics of the "getMessage" method (see below).
054:             */
055:            protected boolean specialConstructor;
056:
057:            /**
058:             * This is the last token that has been consumed successfully. If this object
059:             * has been created due to a parse error, the token followng this token will
060:             * (therefore) be the first error token.
061:             */
062:            public Token currentToken;
063:
064:            /**
065:             * Each entry in this array is an array of integers. Each array of integers
066:             * represents a sequence of tokens (by their ordinal values) that is expected
067:             * at this point of the parse.
068:             */
069:            public int[][] expectedTokenSequences;
070:
071:            /**
072:             * This is a reference to the "tokenImage" array of the generated parser
073:             * within which the parse error occurred. This array is defined in the
074:             * generated ...Constants interface.
075:             */
076:            public String[] tokenImage;
077:
078:            /**
079:             * This method has the standard behavior when this object has been created
080:             * using the standard constructors. Otherwise, it uses "currentToken" and
081:             * "expectedTokenSequences" to generate a parse error message and returns it.
082:             * If this object has been created due to a parse error, and you do not catch
083:             * it (it gets thrown from the parser), then this method is called during the
084:             * printing of the final stack trace, and hence the correct error message
085:             * gets displayed.
086:             */
087:            @Override
088:            public String getMessage() {
089:                if (!specialConstructor) {
090:                    return super .getMessage();
091:                }
092:                StringBuffer expected = new StringBuffer();
093:                int maxSize = 0;
094:                for (int i = 0; i < expectedTokenSequences.length; i++) {
095:                    if (maxSize < expectedTokenSequences[i].length) {
096:                        maxSize = expectedTokenSequences[i].length;
097:                    }
098:                    for (int j = 0; j < expectedTokenSequences[i].length; j++) {
099:                        expected.append(
100:                                tokenImage[expectedTokenSequences[i][j]])
101:                                .append(" ");
102:                    }
103:                    if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
104:                        expected.append("...");
105:                    }
106:                    expected.append(eol).append("    ");
107:                }
108:                String retval = "Encountered \"";
109:                Token tok = currentToken.next;
110:                for (int i = 0; i < maxSize; i++) {
111:                    if (i != 0) {
112:                        retval += " ";
113:                    }
114:                    if (tok.kind == 0) {
115:                        retval += tokenImage[0];
116:                        break;
117:                    }
118:                    retval += add_escapes(tok.image);
119:                    tok = tok.next;
120:                }
121:                retval += "\" at line " + currentToken.next.beginLine
122:                        + ", column " + currentToken.next.beginColumn;
123:                retval += "." + eol;
124:                if (expectedTokenSequences.length == 1) {
125:                    retval += "Was expecting:" + eol + "    ";
126:                } else {
127:                    retval += "Was expecting one of:" + eol + "    ";
128:                }
129:                retval += expected.toString();
130:                return retval;
131:            }
132:
133:            /**
134:             * The end of line string for this machine.
135:             */
136:            protected String eol = System.getProperty("line.separator", "\n");
137:
138:            /**
139:             * Used to convert raw characters to their escaped version when these raw
140:             * version cannot be used as part of an ASCII string literal.
141:             */
142:            protected String add_escapes(String str) {
143:                StringBuffer retval = new StringBuffer();
144:                char ch;
145:                for (int i = 0; i < str.length(); i++) {
146:                    switch (str.charAt(i)) {
147:                    case 0:
148:                        continue;
149:                    case '\b':
150:                        retval.append("\\b");
151:                        continue;
152:                    case '\t':
153:                        retval.append("\\t");
154:                        continue;
155:                    case '\n':
156:                        retval.append("\\n");
157:                        continue;
158:                    case '\f':
159:                        retval.append("\\f");
160:                        continue;
161:                    case '\r':
162:                        retval.append("\\r");
163:                        continue;
164:                    case '\"':
165:                        retval.append("\\\"");
166:                        continue;
167:                    case '\'':
168:                        retval.append("\\\'");
169:                        continue;
170:                    case '\\':
171:                        retval.append("\\\\");
172:                        continue;
173:                    default:
174:                        if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
175:                            String s = "0000" + Integer.toString(ch, 16);
176:                            retval.append("\\u"
177:                                    + s.substring(s.length() - 4, s.length()));
178:                        } else {
179:                            retval.append(ch);
180:                        }
181:                        continue;
182:                    }
183:                }
184:                return retval.toString();
185:            }
186:
187:        }
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