Source Code Cross Referenced for Symbols.java in  » GIS » GeoTools-2.4.1 » org » geotools » referencing » wkt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.referencing.wkt 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *
005:         *   (C) 2004-2006, Geotools Project Managment Committee (PMC)
006:         *   (C) 2004, Institut de Recherche pour le Développement
007:         *
008:         *    This library is free software; you can redistribute it and/or
009:         *    modify it under the terms of the GNU Lesser General Public
010:         *    License as published by the Free Software Foundation; either
011:         *    version 2.1 of the License, or (at your option) any later version.
012:         *
013:         *    This library is distributed in the hope that it will be useful,
014:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
015:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
016:         *    Lesser General Public License for more details.
017:         */
018:        package org.geotools.referencing.wkt;
019:
020:        import java.text.DecimalFormat;
021:        import java.text.NumberFormat;
022:        import java.util.Locale;
023:
024:        /**
025:         * The set of symbols to use for WKT parsing and formatting.
026:         *
027:         * @since 2.1
028:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/library/referencing/src/main/java/org/geotools/referencing/wkt/Symbols.java $
029:         * @version $Id: Symbols.java 27520 2007-10-16 19:00:52Z desruisseaux $
030:         * @author Martin Desruisseaux
031:         */
032:        public class Symbols {
033:            /**
034:             * The default set of symbols.
035:             */
036:            public static final Symbols DEFAULT = new Symbols(Locale.US);
037:            // DONT't invoke the default constructor for this one.
038:
039:            /**
040:             * A set of symbols with parameters between square brackets, like {@code [...]}.
041:             */
042:            public static final Symbols SQUARE_BRACKETS = DEFAULT;
043:
044:            /**
045:             * A set of symbols with parameters between parentheses,
046:             * like {@code (...)}.
047:             */
048:            public static final Symbols CURLY_BRACKETS = new Symbols();
049:            static {
050:                CURLY_BRACKETS.open = '(';
051:                CURLY_BRACKETS.close = ')';
052:            }
053:
054:            /* ----------------------------------------------------------
055:             * NOTE: Consider all fields below as final.
056:             *       It is not only in order to make construction easier.
057:             *       If the informations provided by those fields became
058:             *       needed outside of this package, then we need to make
059:             *       them private and declare accessors instead.
060:             * ---------------------------------------------------------- */
061:
062:            /**
063:             * The locale for querying localizable information.
064:             */
065:            final Locale locale;
066:
067:            /**
068:             * The character used for opening brace.
069:             * Usually {@code '['}, but {@code '('} is legal as well.
070:             */
071:            char open = '[';
072:
073:            /**
074:             * The character used for closing brace.
075:             * Usually {@code ']'}, but {@code ')'} is legal as well.
076:             */
077:            char close = ']';
078:
079:            /**
080:             * The character used for opening an array or enumeration.
081:             * Usually {@code '{'}.
082:             */
083:            final char openArray = '{';
084:
085:            /**
086:             * The character used for closing an array or enumeration.
087:             * Usually {@code '}'}.
088:             */
089:            final char closeArray = '}';
090:
091:            /**
092:             * The character used for quote.
093:             * Usually {@code '"'}.
094:             */
095:            final char quote = '"';
096:
097:            /**
098:             * The character used as a separator. Usually {@code ','}, but would need
099:             * to be changed if a non-English locale is used for formatting numbers.
100:             */
101:            char separator = ',';
102:
103:            /**
104:             * The character used for space.
105:             * Usually <code>'&nbsp;'</code>, but could be a no-break space too if unicode is allowed.
106:             */
107:            final char space = ' ';
108:
109:            /**
110:             * List of caracters acceptable as opening bracket. The closing bracket must
111:             * be the character in the {@code closingBrackets} array at the same index
112:             * than the opening bracket.
113:             */
114:            final char[] openingBrackets = { '[', '(' };
115:
116:            /**
117:             * List of caracters acceptable as closing bracket.
118:             */
119:            final char[] closingBrackets = { ']', ')' };
120:
121:            /**
122:             * The object to use for parsing and formatting numbers.
123:             *
124:             * <STRONG>Note:</STRONG> {@link NumberFormat} object are usually not thread safe.
125:             * Consequently, each instances of {@link Parser} or {@link Formatter} must use a
126:             * clone of this object, not this object directly (unless they synchronize on it).
127:             */
128:            final NumberFormat numberFormat;
129:
130:            /**
131:             * Creates a new instance initialized to the default symbols.
132:             */
133:            private Symbols() {
134:                locale = Locale.US;
135:                numberFormat = DEFAULT.numberFormat;
136:            }
137:
138:            /**
139:             * Creates a new set of symbols for the specified locale.
140:             */
141:            public Symbols(final Locale locale) {
142:                this .locale = locale;
143:                numberFormat = NumberFormat.getNumberInstance(locale);
144:                numberFormat.setGroupingUsed(false);
145:                numberFormat.setMinimumFractionDigits(1);
146:                numberFormat.setMaximumFractionDigits(20);
147:                /*
148:                 * The "maximum fraction digits" seems hight for the precision of floating
149:                 * points (even in double precision), but this is because the above format
150:                 * do not uses the scientific notation. For example 1E-5 is always formatted
151:                 * as 0.00001, and 1E-340 would actually need a maximum fraction digits of
152:                 * 340. For most parameters, such low values should not occurs and may be
153:                 * rounding error for the 0 value. For semi-major and semi-minor axis, we
154:                 * often want to avoid exponential notation as well.
155:                 */
156:                if (numberFormat instanceof  DecimalFormat) {
157:                    final char decimalSeparator = ((DecimalFormat) numberFormat)
158:                            .getDecimalFormatSymbols().getDecimalSeparator();
159:                    if (decimalSeparator == ',') {
160:                        separator = ';';
161:                    }
162:                }
163:            }
164:
165:            /**
166:             * Returns {@code true} if the specified WKT contains at least one {@code AXIS[...]} element.
167:             * This method tries to make a quick checks taking in account a minimal set of WKT syntax rules.
168:             *
169:             * @since 2.4
170:             */
171:            public boolean containsAxis(final CharSequence wkt) {
172:                return indexOf(wkt, "AXIS", 0) >= 0;
173:            }
174:
175:            /**
176:             * Returns the index after the specified element in the specified WKT, or -1 if not found.
177:             * The element must be followed (ignoring spaces) by an opening bracket. If found, this
178:             * method returns the index of the opening bracket after the element.
179:             *
180:             * @param  wkt The WKT to parse.
181:             * @param  element The element to search. Must contains only uppercase letters.
182:             * @param  index The index to start the search from.
183:             */
184:            private int indexOf(final CharSequence wkt, final String element,
185:                    int index) {
186:                assert element.equals(element.trim().toUpperCase(locale)) : element;
187:                assert element.indexOf(quote) < 0 : element;
188:                boolean isQuoting = false;
189:                final int elementLength = element.length();
190:                final int length = wkt.length();
191:                if (index < length) {
192:                    char c = wkt.charAt(index);
193:                    search: while (true) {
194:                        // Do not parse any content between quotes.
195:                        if (c == quote) {
196:                            isQuoting = !isQuoting;
197:                        }
198:                        if (isQuoting || !Character.isJavaIdentifierStart(c)) {
199:                            if (++index == length) {
200:                                break search;
201:                            }
202:                            c = wkt.charAt(index);
203:                            continue;
204:                        }
205:                        // Checks if we have a match.
206:                        for (int j = 0; j < elementLength; j++) {
207:                            c = Character.toUpperCase(c);
208:                            if (c != element.charAt(j)) {
209:                                // No match. Skip all remaining letters and resume the search.
210:                                while (Character.isJavaIdentifierPart(c)) {
211:                                    if (++index == length) {
212:                                        break search;
213:                                    }
214:                                    c = wkt.charAt(index);
215:                                }
216:                                continue search;
217:                            }
218:                            if (++index == length) {
219:                                break search;
220:                            }
221:                            c = wkt.charAt(index);
222:                        }
223:                        // Checks if the next character (ignoring space) is an opening brace.
224:                        while (Character.isWhitespace(c)) {
225:                            if (++index == length) {
226:                                break search;
227:                            }
228:                            c = wkt.charAt(index);
229:                        }
230:                        for (int i = 0; i < openingBrackets.length; i++) {
231:                            if (c == openingBrackets[i]) {
232:                                return index;
233:                            }
234:                        }
235:                    }
236:                }
237:                return -1;
238:            }
239:        }
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