Source Code Cross Referenced for ParseException.java in  » Library » Apache-beehive-1.0.2-src » org » apache » beehive » controls » system » jdbc » parser » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache beehive 1.0.2 src » org.apache.beehive.controls.system.jdbc.parser 
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.apache.beehive.controls.system.jdbc.parser;
003:
004:        /**
005:         * This exception is thrown when parse errors are encountered.
006:         * You can explicitly create objects of this exception type by
007:         * calling the method generateParseException in the generated
008:         * parser.
009:         *
010:         * You can modify this class to customize your error reporting
011:         * mechanisms so long as you retain the public fields.
012:         */
013:        public class ParseException extends Exception {
014:
015:            /**
016:             * This constructor is used by the method "generateParseException"
017:             * in the generated parser.  Calling this constructor generates
018:             * a new object of this type with the fields "currentToken",
019:             * "expectedTokenSequences", and "tokenImage" set.  The boolean
020:             * flag "specialConstructor" is also set to true to indicate that
021:             * this constructor was used to create this object.
022:             * This constructor calls its super class with the empty string
023:             * to force the "toString" method of parent class "Throwable" to
024:             * print the error message in the form:
025:             *     ParseException: <result of getMessage>
026:             */
027:            public ParseException(Token currentTokenVal,
028:                    int[][] expectedTokenSequencesVal, String[] tokenImageVal) {
029:                super ("");
030:                specialConstructor = true;
031:                currentToken = currentTokenVal;
032:                expectedTokenSequences = expectedTokenSequencesVal;
033:                tokenImage = tokenImageVal;
034:            }
035:
036:            /**
037:             * The following constructors are for use by you for whatever
038:             * purpose you can think of.  Constructing the exception in this
039:             * manner makes the exception behave in the normal way - i.e., as
040:             * documented in the class "Throwable".  The fields "errorToken",
041:             * "expectedTokenSequences", and "tokenImage" do not contain
042:             * relevant information.  The JavaCC generated code does not use
043:             * these constructors.
044:             */
045:
046:            public ParseException() {
047:                super ();
048:                specialConstructor = false;
049:            }
050:
051:            public ParseException(String message) {
052:                super (message);
053:                specialConstructor = false;
054:            }
055:
056:            /**
057:             * This variable determines which constructor was used to create
058:             * this object and thereby affects the semantics of the
059:             * "getMessage" method (see below).
060:             */
061:            protected boolean specialConstructor;
062:
063:            /**
064:             * This is the last token that has been consumed successfully.  If
065:             * this object has been created due to a parse error, the token
066:             * followng this token will (therefore) be the first error token.
067:             */
068:            public Token currentToken;
069:
070:            /**
071:             * Each entry in this array is an array of integers.  Each array
072:             * of integers represents a sequence of tokens (by their ordinal
073:             * values) that is expected at this point of the parse.
074:             */
075:            public int[][] expectedTokenSequences;
076:
077:            /**
078:             * This is a reference to the "tokenImage" array of the generated
079:             * parser within which the parse error occurred.  This array is
080:             * defined in the generated ...Constants interface.
081:             */
082:            public String[] tokenImage;
083:
084:            /**
085:             * This method has the standard behavior when this object has been
086:             * created using the standard constructors.  Otherwise, it uses
087:             * "currentToken" and "expectedTokenSequences" to generate a parse
088:             * error message and returns it.  If this object has been created
089:             * due to a parse error, and you do not catch it (it gets thrown
090:             * from the parser), then this method is called during the printing
091:             * of the final stack trace, and hence the correct error message
092:             * gets displayed.
093:             */
094:            public String getMessage() {
095:                if (!specialConstructor) {
096:                    return super .getMessage();
097:                }
098:                String expected = "";
099:                int maxSize = 0;
100:                for (int i = 0; i < expectedTokenSequences.length; i++) {
101:                    if (maxSize < expectedTokenSequences[i].length) {
102:                        maxSize = expectedTokenSequences[i].length;
103:                    }
104:                    for (int j = 0; j < expectedTokenSequences[i].length; j++) {
105:                        expected += tokenImage[expectedTokenSequences[i][j]]
106:                                + " ";
107:                    }
108:                    if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
109:                        expected += "...";
110:                    }
111:                    expected += eol + "    ";
112:                }
113:                String retval = "Encountered \"";
114:                Token tok = currentToken.next;
115:                for (int i = 0; i < maxSize; i++) {
116:                    if (i != 0)
117:                        retval += " ";
118:                    if (tok.kind == 0) {
119:                        retval += tokenImage[0];
120:                        break;
121:                    }
122:                    retval += add_escapes(tok.image);
123:                    tok = tok.next;
124:                }
125:                retval += "\" at line " + currentToken.next.beginLine
126:                        + ", column " + currentToken.next.beginColumn;
127:                retval += "." + eol;
128:                if (expectedTokenSequences.length == 1) {
129:                    retval += "Was expecting:" + eol + "    ";
130:                } else {
131:                    retval += "Was expecting one of:" + eol + "    ";
132:                }
133:                retval += expected;
134:                return retval;
135:            }
136:
137:            /**
138:             * The end of line string for this machine.
139:             */
140:            protected String eol = System.getProperty("line.separator", "\n");
141:
142:            /**
143:             * Used to convert raw characters to their escaped version
144:             * when these raw version cannot be used as part of an ASCII
145:             * string literal.
146:             */
147:            protected String add_escapes(String str) {
148:                StringBuffer retval = new StringBuffer();
149:                char ch;
150:                for (int i = 0; i < str.length(); i++) {
151:                    switch (str.charAt(i)) {
152:                    case 0:
153:                        continue;
154:                    case '\b':
155:                        retval.append("\\b");
156:                        continue;
157:                    case '\t':
158:                        retval.append("\\t");
159:                        continue;
160:                    case '\n':
161:                        retval.append("\\n");
162:                        continue;
163:                    case '\f':
164:                        retval.append("\\f");
165:                        continue;
166:                    case '\r':
167:                        retval.append("\\r");
168:                        continue;
169:                    case '\"':
170:                        retval.append("\\\"");
171:                        continue;
172:                    case '\'':
173:                        retval.append("\\\'");
174:                        continue;
175:                    case '\\':
176:                        retval.append("\\\\");
177:                        continue;
178:                    default:
179:                        if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
180:                            String s = "0000" + Integer.toString(ch, 16);
181:                            retval.append("\\u"
182:                                    + s.substring(s.length() - 4, s.length()));
183:                        } else {
184:                            retval.append(ch);
185:                        }
186:                        continue;
187:                    }
188:                }
189:                return retval.toString();
190:            }
191:
192:        }
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