Source Code Cross Referenced for REException.java in  » IDE » J » gnu » regexp » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE » J » gnu.regexp 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *  gnu/regexp/REException.java
003:         *  Copyright (C) 1998-2001 Wes Biggs
004:         *
005:         *  This library is free software; you can redistribute it and/or modify
006:         *  it under the terms of the GNU Lesser General Public License as published
007:         *  by the Free Software Foundation; either version 2.1 of the License, or
008:         *  (at your option) any later version.
009:         *
010:         *  This library is distributed in the hope that it will be useful,
011:         *  but WITHOUT ANY WARRANTY; without even the implied warranty of
012:         *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013:         *  GNU Lesser General Public License for more details.
014:         *
015:         *  You should have received a copy of the GNU Lesser General Public License
016:         *  along with this program; if not, write to the Free Software
017:         *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
018:         */
019:
020:        package gnu.regexp;
021:
022:        import java.text.MessageFormat;
023:
024:        /**
025:         * This is the regular expression exception class.  An exception of this type
026:         * defines the three attributes:
027:         * <OL>
028:         * <LI> A descriptive message of the error.
029:         * <LI> An integral type code equivalent to one of the statically
030:         *      defined symbols listed below.
031:         * <LI> The approximate position in the input string where the error
032:         *      occurred.
033:         * </OL>
034:         *
035:         * @author <A HREF="mailto:wes@cacas.org">Wes Biggs</A>
036:         */
037:
038:        public class REException extends Exception {
039:            private int type;
040:            private int pos;
041:
042:            // Error conditions from GNU regcomp(3) manual
043:
044:            /**
045:             * Error flag.
046:             * Invalid use of repetition operators such  as  using
047:             * `*' as the first character.
048:             */
049:            public static final int REG_BADRPT = 1;
050:
051:            /**
052:             * Error flag.
053:             * Invalid use of back reference operator.
054:             */
055:            public static final int REG_BADBR = 2;
056:
057:            /**
058:             * Error flag.
059:             * Un-matched brace interval operators.
060:             */
061:            public static final int REG_EBRACE = 3;
062:
063:            /**
064:             * Error flag.
065:             * Un-matched bracket list operators.
066:             */
067:            public static final int REG_EBRACK = 4;
068:
069:            /**
070:             * Error flag.
071:             * Invalid  use  of the range operator, eg. the ending
072:             * point of the range occurs  prior  to  the  starting
073:             * point.
074:             */
075:            public static final int REG_ERANGE = 5;
076:
077:            /**
078:             * Error flag.
079:             * Unknown character class name. <B>Not implemented</B>.
080:             */
081:            public static final int REG_ECTYPE = 6;
082:
083:            /**
084:             * Error flag.
085:             * Un-matched parenthesis group operators.
086:             */
087:            public static final int REG_EPAREN = 7;
088:
089:            /**
090:             * Error flag.
091:             * Invalid back reference to a subexpression.
092:             */
093:            public static final int REG_ESUBREG = 8;
094:
095:            /**
096:             * Error flag.
097:             * Non specific error. <B>Not implemented</B>.
098:             */
099:            public static final int REG_EEND = 9;
100:
101:            /**
102:             * Error flag.
103:             * Invalid escape sequence. <B>Not implemented</B>.
104:             */
105:            public static final int REG_ESCAPE = 10;
106:
107:            /**
108:             * Error flag.
109:             * Invalid  use  of pattern operators such as group or list.
110:             */
111:            public static final int REG_BADPAT = 11;
112:
113:            /**
114:             * Error flag.
115:             * Compiled  regular  expression  requires  a  pattern
116:             * buffer larger than 64Kb. <B>Not implemented</B>.
117:             */
118:            public static final int REG_ESIZE = 12;
119:
120:            /**
121:             * Error flag.
122:             * The regex routines ran out of memory. <B>Not implemented</B>.
123:             */
124:            public static final int REG_ESPACE = 13;
125:
126:            REException(String msg, int type, int position) {
127:                super (msg);
128:                this .type = type;
129:                this .pos = position;
130:            }
131:
132:            /**
133:             * Returns the type of the exception, one of the constants listed above.
134:             */
135:
136:            public int getType() {
137:                return type;
138:            }
139:
140:            /**
141:             * Returns the position, relative to the string or character array being
142:             * compiled, where the error occurred.  This position is generally the point
143:             * where the error was detected, not necessarily the starting index of
144:             * a bad subexpression.
145:             */
146:            public int getPosition() {
147:                return pos;
148:            }
149:
150:            /**
151:             * Reports the descriptive message associated with this exception
152:             * as well as its index position in the string or character array
153:             * being compiled.
154:             */
155:            public String getMessage() {
156:                Object[] args = { new Integer(pos) };
157:                StringBuffer sb = new StringBuffer();
158:                String prefix = RE.getLocalizedMessage("error.prefix");
159:                sb.append(MessageFormat.format(prefix, args));
160:                sb.append('\n');
161:                sb.append(super.getMessage());
162:                return sb.toString();
163:            }
164:        }
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