Source Code Cross Referenced for Version.java in  » Database-Client » iSQL-Viewer » org » isqlviewer » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database Client » iSQL Viewer » org.isqlviewer.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * The contents of this file are subject to the Mozilla Public License
003:         * Version 1.1 (the "License"); you may not use this file except in
004:         * compliance with the License. You may obtain a copy of the License at
005:         * http://www.mozilla.org/MPL/
006:         *
007:         * Software distributed under the License is distributed on an "AS IS"
008:         * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
009:         * License for the specific language governing rights and limitations
010:         * under the License.
011:         * 
012:         * The Original Code is iSQL-Viewer, A Mutli-Platform Database Tool.
013:         *
014:         * The Initial Developer of the Original Code is iSQL-Viewer, A Mutli-Platform Database Tool.
015:         * Portions created by Mark A. Kobold are Copyright (C) 2000-2007. All Rights Reserved.
016:         *
017:         * Contributor(s): 
018:         *  Mark A. Kobold [mkobold <at> isqlviewer <dot> com].
019:         *  
020:         * If you didn't download this code from the following link, you should check
021:         * if you aren't using an obsolete version: http://www.isqlviewer.com
022:         */
023:        package org.isqlviewer.util;
024:
025:        import java.io.Serializable;
026:        import java.text.MessageFormat;
027:        import java.util.NoSuchElementException;
028:        import java.util.StringTokenizer;
029:
030:        /**
031:         * Version identifier for software bundles and packages.
032:         * <p>
033:         * This Version class supports four four components.
034:         * <ol>
035:         * <li>Major version. A non-negative integer.</li>
036:         * <li>Minor version. A non-negative integer.</li>
037:         * <li>Patch version. A non-negative integer.</li>
038:         * <li>Qualifier. A text string. See <code>Version(String)</code> for the format of the qualifier string.</li>
039:         * </ol>
040:         * <p>
041:         * All Version object instances are immutable.
042:         * 
043:         * @author Mark A. Kobold &lt;mkobold at isqlviewer dot com&gt;
044:         * @version 1.0
045:         */
046:        public class Version implements  Comparable<Version>, Serializable {
047:
048:            private static final long serialVersionUID = 1L;
049:            private static final String SEPARATOR = ".";
050:            private static final String BUNDLE_IDENTIFIER = "org.isqlviewer.util.ResourceBundle.properties";
051:            private static final MessageFormat baseFormat = new MessageFormat(
052:                    "{0}.{1}.{2}");
053:
054:            private final int major;
055:            private final int minor;
056:            private final int patch;
057:            private final String qualifier;
058:            private LocalMessages messages = new LocalMessages(
059:                    BUNDLE_IDENTIFIER);
060:
061:            /**
062:             * The empty version "0.0.0". Equivalent to calling <code>new Version(0,0,0)</code>.
063:             */
064:            public static final Version EMPTY_VERSION = new Version(0, 0, 0);
065:
066:            /**
067:             * Creates a version identifier from the specified numerical components.
068:             * <p>
069:             * The qualifier is set to the empty string.
070:             * 
071:             * @param major Major component of the version identifier.
072:             * @param minor Minor component of the version identifier.
073:             * @param micro Micro component of the version identifier.
074:             * @throws IllegalArgumentException If the numerical components are negative.
075:             */
076:            public Version(int major, int minor, int micro) {
077:
078:                this (major, minor, micro, null);
079:            }
080:
081:            /**
082:             * Creates a version identifier from the specifed components.
083:             * 
084:             * @param major Major component of the version identifier.
085:             * @param minor Minor component of the version identifier.
086:             * @param micro Micro component of the version identifier.
087:             * @param qualifier Qualifier component of the version identifier. If <code>null</code> is specified, then the
088:             *        qualifier will be set to the empty string.
089:             * @throws IllegalArgumentException If the numerical components are negative or the qualifier string is invalid.
090:             */
091:            public Version(int major, int minor, int micro, String qualifier) {
092:
093:                this .major = major;
094:                this .minor = minor;
095:                this .patch = micro;
096:
097:                if (qualifier == null) {
098:                    this .qualifier = "";
099:                } else {
100:                    this .qualifier = qualifier;
101:                }
102:                validateComponents();
103:            }
104:
105:            /**
106:             * Parses a version identifier from the specified string.
107:             * <p>
108:             * Standard format for a version string.
109:             * 
110:             * <pre>
111:             *  VERSION   ::= MAJOR [SEPERATOR MINOR [SEPERATOR PATCH [SEPERATOR QUALIFIER] ] ]
112:             *  MAJOR     ::= (DIGIT)+
113:             *  MINOR     ::= (DIGIT)+
114:             *  PATCH     ::= (DIGIT)+
115:             *  QUALIFIER ::= (ALPHA|DIGIT|'_'|'-')+
116:             *  SEPERATOR ::= '.'
117:             *  DIGIT     ::= {0..9}
118:             *  ALPHA     ::= {a..zA..Z}
119:             * </pre>
120:             * 
121:             * @param version String representation of the version identifier.
122:             * @return new Version instance with the respective components from the version text.
123:             * @throws IllegalArgumentException If version text is not properly formatted.
124:             */
125:            public static Version forString(String version) {
126:
127:                if (version == null) {
128:                    return EMPTY_VERSION;
129:                }
130:
131:                String workingCopy = version.trim();
132:                if (workingCopy.length() == 0) {
133:                    return EMPTY_VERSION;
134:                }
135:                int major = 0;
136:                int minor = 0;
137:                int micro = 0;
138:                String qualifier = "";
139:                StringTokenizer st = new StringTokenizer(workingCopy,
140:                        SEPARATOR, true);
141:                try {
142:                    major = Integer.parseInt(st.nextToken());
143:                    if (st.hasMoreTokens()) {
144:                        st.nextToken();
145:                        minor = Integer.parseInt(st.nextToken());
146:                        if (st.hasMoreTokens()) {
147:                            st.nextToken();
148:                            micro = Integer.parseInt(st.nextToken());
149:                            if (st.hasMoreTokens()) {
150:                                st.nextToken();
151:                                qualifier = st.nextToken();
152:                            }
153:                        }
154:                    }
155:                } catch (NoSuchElementException e) {
156:                    throw new IllegalArgumentException();
157:                }
158:                return new Version(major, minor, micro, qualifier);
159:            }
160:
161:            /**
162:             * Returns the major component of this version identifier.
163:             * 
164:             * @return The major component.
165:             */
166:            public int getMajor() {
167:
168:                return major;
169:            }
170:
171:            /**
172:             * Returns the minor component of this version identifier.
173:             * 
174:             * @return The minor component.
175:             */
176:            public int getMinor() {
177:
178:                return minor;
179:            }
180:
181:            /**
182:             * Returns the patch component of this version identifier.
183:             * 
184:             * @return The patch component.
185:             */
186:            public int getPatch() {
187:
188:                return patch;
189:            }
190:
191:            /**
192:             * Returns the qualifier component of this version identifier.
193:             * 
194:             * @return The qualifier component.
195:             */
196:            public String getQualifier() {
197:
198:                return qualifier;
199:            }
200:
201:            /**
202:             * Returns the string representation of this version identifier.
203:             * <p>
204:             * The format of the version string will be <code>major.minor.micro</code> if qualifier is the empty string or
205:             * <code>major.minor.micro.qualifier</code> otherwise.
206:             * 
207:             * @return The string representation of this version identifier.
208:             */
209:            public String toString() {
210:
211:                Object[] argument = new Object[3];
212:                argument[0] = Integer.toString(major);
213:                argument[1] = Integer.toString(minor);
214:                argument[2] = Integer.toString(patch);
215:                String versionText = baseFormat.format(argument);
216:                if (qualifier.length() == 0) {
217:                    return versionText;
218:                }
219:                return versionText.concat(SEPARATOR.concat(qualifier));
220:            }
221:
222:            /**
223:             * Returns a hash code value for the object.
224:             * <p>
225:             * 
226:             * @return An integer which is a hash code value for this object.
227:             */
228:            public int hashCode() {
229:
230:                return (major << 24) + (minor << 16) + (patch << 8)
231:                        + qualifier.hashCode();
232:            }
233:
234:            /**
235:             * Compares this instance to another object.
236:             * <p>
237:             * A version is considered to be <b>equal to </b> another version if the version components (major, minor, micro,
238:             * qualifier) are equal.
239:             * 
240:             * @param object to test for equality.
241:             * @return <tt>true</tt> if object is a Version and is equal to this instance. Otherwise <tt>false</tt>.
242:             */
243:            public boolean equals(Object object) {
244:
245:                if (object instanceof  Version) {
246:                    Version other = (Version) object;
247:                    boolean eqMajor = (major == other.major);
248:                    boolean eqMinor = (minor == other.minor);
249:                    boolean eqPatch = (patch == other.patch);
250:                    boolean eqQualifier = qualifier.equals(other.qualifier);
251:                    return eqMajor && eqMinor && eqPatch && eqQualifier;
252:                }
253:                return false;
254:            }
255:
256:            /**
257:             * Compares this instance to another version.
258:             * <p>
259:             * A version is considered to be <b>less than </b> another version if its major component is less than the other
260:             * version's major component, or the major components are equal and its minor component is less than the other
261:             * version's minor component, or the major and minor components are equal and its micro component is less than the
262:             * other version's micro component, or the major, minor and micro components are equal and it's qualifier component
263:             * is less than the other version's qualifier component (using <code>String.compareTo</code>).
264:             * <p>
265:             * A version is considered to be equal to< another version if the all version components (major, minor, micro, and
266:             * qualifier) are equal.
267:             * 
268:             * @param object The <code>Version</code> object to be compared.
269:             * @return Comparsion value defined by the comparable interface.
270:             */
271:            public int compareTo(Version version) {
272:
273:                if (version == this ) {
274:                    return 0;
275:                }
276:                int comparison = -1;
277:
278:                comparison = (major < version.major ? -1
279:                        : (major == version.major ? 0 : 1));
280:                if (comparison != 0) {
281:                    return comparison;
282:                }
283:                comparison = (minor < version.minor ? -1
284:                        : (minor == version.minor ? 0 : 1));
285:                if (comparison != 0) {
286:                    return comparison;
287:                }
288:                comparison = (patch < version.patch ? -1
289:                        : (patch == version.patch ? 0 : 1));
290:                if (comparison != 0) {
291:                    return comparison;
292:                }
293:                return qualifier.compareTo(version.qualifier);
294:            }
295:
296:            /**
297:             * Called by the constructors to ensure the correctness of the version components.
298:             * 
299:             * @throws IllegalArgumentException If the numerical components are negative or the qualifier string is invalid.
300:             */
301:            private void validateComponents() {
302:
303:                if (major < 0) {
304:                    throw new IllegalArgumentException(messages.format(
305:                            "Version.bad_major", Integer.toString(major)));
306:                }
307:                if (minor < 0) {
308:                    throw new IllegalArgumentException(messages.format(
309:                            "Version.bad_minor", Integer.toString(minor)));
310:                }
311:                if (patch < 0) {
312:                    throw new IllegalArgumentException(messages.format(
313:                            "Version.bad_patch", Integer.toString(patch)));
314:                }
315:                int length = qualifier.length();
316:                for (int i = 0; i < length; i++) {
317:                    char cdata = qualifier.charAt(i);
318:                    if (!Character.isLetterOrDigit(cdata)) {
319:                        switch (cdata) {
320:                        case '_':
321:                        case '-':
322:                            break;
323:                        default:
324:                            Object[] arguments = new Object[2];
325:                            arguments[0] = Integer.toString(i);
326:                            arguments[1] = Character.toString(cdata);
327:                            throw new IllegalArgumentException(messages.format(
328:                                    "Version.bad_text", arguments));
329:                        }
330:                    }
331:                }
332:            }
333:
334:        }
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