Source Code Cross Referenced for SQLUtil.java in  » Database-Client » sqlshell » nl » improved » sqlclient » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database Client » sqlshell » nl.improved.sqlclient 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2007 Roy van der Kuil (roy@vanderkuil.nl) and Stefan Rotman (stefan@rotman.net)
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *     http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:        package nl.improved.sqlclient;
017:
018:        import java.util.List;
019:        import java.util.Arrays;
020:        import java.util.ArrayList;
021:        import java.util.Iterator;
022:
023:        /**
024:         * A SQL Utility class.
025:         * This class helps in tab completion.
026:         */
027:        public class SQLUtil {
028:
029:            /**
030:             * A regular expression statement for name chars.
031:             */
032:            private static final String NAMING_CHAR = "(_|-|[0-9]|[A-Z])";
033:            /**
034:             * A table name regular expression statement.
035:             */
036:            private static final String TABLE = "[A-Z]+" + NAMING_CHAR + "*";
037:            /**
038:             * A column name regular expression statement.
039:             */
040:            private static final String COLUMN = "(\\*|[A-Z]+" + NAMING_CHAR
041:                    + "*)";
042:            /**
043:             * A variable (table name + columnname) regular expression statement.
044:             */
045:            private static final String VAR = "(|" + TABLE + "\\.)" + COLUMN;
046:            /**
047:             * SQL Comparators.
048:             */
049:            private static final String COMPARATOR = "(=|<>|<|>)";
050:            /**
051:             * A sql variable description.
052:             */
053:            private static final String VALUE = "('.*'|[0-9]+|" + VAR + ")";
054:
055:            public static List<String> KEYWORDS = Arrays
056:                    .asList(new String[] { "SELECT", "UPDATE", "FROM", "WHERE",
057:                            "VALUES", "SET", "INSERT", "INTO", "DELETE",
058:                            "GROUP BY", "ORDER BY", "DESC" });
059:
060:            /**
061:             * Private constructor.
062:             * Utility classes only have static methods.
063:             */
064:            private SQLUtil() {
065:            }
066:
067:            /**
068:             * Fetch the last sql keyword from the command string.
069:             * @param s the sql command string
070:             * @return the last sql keyword
071:             */
072:            public static String getLastKeyWord(CharSequence s) {
073:                String seq = s.toString();
074:                String seqUpper = seq.toUpperCase();
075:                String lastKeyWord = null;
076:                int maxIndex = -1;
077:                Iterator<String> iKeywords = KEYWORDS.iterator();
078:                while (iKeywords.hasNext()) {
079:                    String keyword = iKeywords.next();
080:                    int tmpIndex = seqUpper.indexOf(keyword);
081:                    int tmpEndIndex = tmpIndex + keyword.length();
082:
083:                    //Ensuring the keyword is not a in-word match
084:                    if (tmpIndex > 0
085:                            && seqUpper.substring(tmpIndex - 1, tmpIndex)
086:                                    .matches(NAMING_CHAR)) {
087:                        continue;
088:                    } else if (tmpIndex != -1
089:                            && tmpEndIndex < seqUpper.length()
090:                            && seqUpper.substring(tmpEndIndex, tmpEndIndex + 1)
091:                                    .matches(NAMING_CHAR)) {
092:                        continue;
093:                    }
094:
095:                    if (tmpIndex > maxIndex) {
096:                        maxIndex = tmpIndex;
097:                        lastKeyWord = seq.substring(maxIndex, maxIndex
098:                                + keyword.length());
099:                    }
100:                }
101:                return lastKeyWord;
102:            }
103:
104:            /**
105:             * Parse the table names from the sql command lines.
106:             * @param commandInfo a list of commandlines (parts)
107:             * @param point the cursor position
108:             */
109:            protected static List<String> parseTableNames(
110:                    List<? extends CharSequence> commandInfo, Point point) {
111:                String command = getStartOfCommand(
112:                        commandInfo,
113:                        new Point(commandInfo.get(commandInfo.size() - 1)
114:                                .length(), commandInfo.size() - 1)).toString();
115:                String commandUpper = command.toUpperCase();
116:                int startIndex;
117:                if (commandUpper.indexOf("FROM") > 0) {
118:                    startIndex = commandUpper.indexOf("FROM") + "FROM".length();
119:                } else /*if (commandUpper.indexOf("INTO") > 0)*/{
120:                    startIndex = commandUpper.indexOf("INTO") + "INTO".length();
121:                }
122:                List<String> returnValue = new ArrayList<String>();
123:                int tmpIndex;
124:                if (command.indexOf(' ', startIndex + 1) > command.indexOf(',',
125:                        startIndex)
126:                        && command.indexOf(',', startIndex) > 0) {
127:                    while ((tmpIndex = command.indexOf(',', startIndex)) > 0) {
128:                        returnValue.add(command.substring(startIndex, tmpIndex)
129:                                .trim());
130:                        startIndex = tmpIndex + 1;
131:                    }
132:                }
133:                int endIndex = command.indexOf(' ', startIndex + 1);
134:                if (endIndex < 0) {
135:                    endIndex = command.length();
136:                }
137:                returnValue.add(command.substring(startIndex, endIndex).trim());
138:
139:                return returnValue;
140:            }
141:
142:            public static TabCompletionInfo getTabCompletionInfo(
143:                    SQLCommand command, Point commandPoint) {
144:                return getTabCompletionInfo(command.getLines(), commandPoint);
145:
146:            }
147:
148:            /**
149:             * Return tab completion info for the provided command lines.
150:             * @param commandInfo the sql command lines
151:             * @param commandPoint the cursor position for tab completion
152:             * @return tab completion info for the provided command lines.
153:             */
154:            public static TabCompletionInfo getTabCompletionInfo(
155:                    List<? extends CharSequence> commandInfo, Point commandPoint) {
156:                if (commandInfo.size() == 1 && commandInfo.get(0).length() == 0) {
157:                    return new TabCompletionInfo(
158:                            TabCompletionInfo.MatchType.SQL_KEYWORD, Arrays
159:                                    .asList(new String[] { "SELECT",
160:                                            "INSERT INTO", "DELETE FROM",
161:                                            "UPDATE" }));
162:                }
163:                String startOfCommand = getStartOfCommand(commandInfo,
164:                        commandPoint);
165:                //System.out.println("Startof command: "+ startOfCommand);
166:                String lastKeyword = getLastKeyWord(startOfCommand);
167:                //System.out.println("Last keyword: "+ lastKeyword);
168:                if (lastKeyword == null) {
169:                    return new TabCompletionInfo(
170:                            TabCompletionInfo.MatchType.SQL_KEYWORD, Arrays
171:                                    .asList(new String[] { "SELECT",
172:                                            "INSERT INTO", "DELETE FROM",
173:                                            "UPDATE" }), startOfCommand);
174:                }
175:                if (lastKeyword.equalsIgnoreCase("UPDATE")) {
176:                    String end = startOfCommand.substring(startOfCommand
177:                            .lastIndexOf(' ') + 1);
178:                    String upCommand = startOfCommand.toUpperCase();
179:                    if (upCommand.matches("UPDATE[\\s]+" + TABLE
180:                            + "[\\s]+(|S|SE|SET)")) {
181:                        return new TabCompletionInfo(
182:                                TabCompletionInfo.MatchType.SQL_KEYWORD, Arrays
183:                                        .asList(new String[] { "SET" }), end);
184:                    }
185:                    if (upCommand.matches("UPDATE[\\s]+" + TABLE
186:                            + "[\\s]+SET[\\s]+")) {
187:                        String tableName = upCommand.substring("UPDATE"
188:                                .length());
189:                        tableName = tableName.substring(0,
190:                                tableName.indexOf("SET")).trim();
191:                        return new TabCompletionInfo(
192:                                TabCompletionInfo.MatchType.COLUMN_NAMES,
193:                                Arrays.asList(tableName), end);
194:                    }
195:                    return new TabCompletionInfo(
196:                            TabCompletionInfo.MatchType.TABLE_NAMES,
197:                            new ArrayList<String>(), end);
198:                } else if (lastKeyword.equalsIgnoreCase("SET")) {
199:                    String end = startOfCommand.substring(startOfCommand
200:                            .lastIndexOf(' ') + 1);
201:                    String upCommand = startOfCommand.toUpperCase();
202:                    if (upCommand.matches("UPDATE[\\s]+" + TABLE
203:                            + "[\\s]+SET[\\s]+")) {
204:                        String tableName = upCommand.substring("UPDATE"
205:                                .length());
206:                        tableName = tableName.substring(0,
207:                                tableName.indexOf("SET")).trim();
208:                        return new TabCompletionInfo(
209:                                TabCompletionInfo.MatchType.COLUMN_NAMES,
210:                                Arrays.asList(tableName), end);
211:                    }
212:                } else if (lastKeyword.equalsIgnoreCase("SELECT")) {
213:                    // if it looks like:
214:                    // SELECT x
215:                    // return "FROM"
216:                    String upCommand = startOfCommand.toUpperCase();
217:                    if (upCommand.length() > "SELECT".length()) {
218:                        if (upCommand
219:                                .substring(
220:                                        upCommand.indexOf("SELECT")
221:                                                + "SELECT".length())
222:                                .matches(
223:                                        "[\\s]+"
224:                                                + VAR
225:                                                + "(|[\\s]*,[\\s]*"
226:                                                + VAR
227:                                                + "[\\s]*)[\\s]+(|F|FR|FRO|FROM)")) {
228:                            String end = startOfCommand
229:                                    .substring(startOfCommand.lastIndexOf(' ') + 1);
230:                            return new TabCompletionInfo(
231:                                    TabCompletionInfo.MatchType.SQL_KEYWORD,
232:                                    Arrays.asList(new String[] { "FROM" }), end);
233:                        }
234:                    }
235:                    // if it looks like:
236:                    // SELECT
237:                    // or
238:                    // SELECT A,
239:                    // return matching columnnames when table names are provided in from clause
240:                    // other wise return table names
241:                    // TODO check for WHERE Clause
242:                    String sub = startOfCommand.substring(
243:                            startOfCommand.indexOf(lastKeyword)
244:                                    + lastKeyword.length()).trim();
245:                    String tableName;
246:                    if (sub.indexOf(',') > 0) {
247:                        tableName = sub.substring(sub.lastIndexOf(',') + 1)
248:                                .trim();
249:                    } else {
250:                        tableName = sub;
251:                    }
252:                    if (tableName.indexOf('.') > 0) {
253:                        return new TabCompletionInfo(
254:                                TabCompletionInfo.MatchType.COLUMN_NAMES,
255:                                Arrays
256:                                        .asList(new String[] { tableName
257:                                                .substring(0, tableName
258:                                                        .indexOf('.')) }),
259:                                tableName.substring(tableName.indexOf('.') + 1));
260:                    }
261:                    return new TabCompletionInfo(
262:                            TabCompletionInfo.MatchType.TABLE_NAMES, Arrays
263:                                    .asList(new String[0]), tableName);
264:                } else if (lastKeyword.equalsIgnoreCase("FROM")) {
265:                    // find out if it looks like
266:                    // 'SELECT x FROM '
267:                    // or
268:                    // 'SELECT x FROM A,'
269:                    if (startOfCommand.trim().endsWith(lastKeyword)
270:                            || startOfCommand.trim().endsWith(",")) {
271:                        int beginIndex = startOfCommand
272:                                .lastIndexOf(lastKeyword)
273:                                + lastKeyword.length();
274:                        return new TabCompletionInfo(
275:                                TabCompletionInfo.MatchType.TABLE_NAMES,
276:                                Arrays.asList(new String[] { startOfCommand
277:                                        .substring(beginIndex).trim() }));
278:                    }
279:                    // (if) it looks like:
280:                    // 'SELECT x FROM A '
281:                    // return WHERE
282:                    String tmpCommand = startOfCommand.substring(
283:                            startOfCommand.indexOf(lastKeyword)
284:                                    + lastKeyword.length() + 1).toUpperCase();
285:                    String WHERE = "W|WH|WHE|WHER|WHERE";
286:                    String GROUP_BY = "G|GR|GRO|GROU|GROUP|GROUP |GROUP B|GROUP BY";
287:                    String ORDER_BY = "O|OR|ORD|ORDE|ORDER|ORDER |ORDER B|ORDER BY";
288:                    //String regexpSQL = "[\\s]*"+VAR+"+([\\s]*,[\\s]*"+VAR+"+)*[\\s]+(|"+WHERE+"|"+GROUP_BY+"|"+ORDER_BY+")";
289:                    String regexpSQL = ".*" + VAR + "[\\s]+(|" + WHERE + "|"
290:                            + GROUP_BY + "|" + ORDER_BY + ")";
291:                    if (tmpCommand.matches(regexpSQL)) {
292:                        String end = startOfCommand.substring(startOfCommand
293:                                .lastIndexOf(' ') + 1);
294:                        return new TabCompletionInfo(
295:                                TabCompletionInfo.MatchType.SQL_KEYWORD, Arrays
296:                                        .asList(new String[] { "WHERE",
297:                                                "GROUP BY", "ORDER BY" }), end);
298:                    }
299:                    String end;
300:                    startOfCommand = startOfCommand.substring(startOfCommand
301:                            .toUpperCase().indexOf("FROM"));
302:                    if (startOfCommand.indexOf(',') > 0) {
303:                        end = startOfCommand.substring(
304:                                startOfCommand.lastIndexOf(',') + 1).trim();
305:                    } else {
306:                        end = startOfCommand.substring(
307:                                startOfCommand.lastIndexOf(' ') + 1).trim();
308:                    }
309:                    return new TabCompletionInfo(
310:                            TabCompletionInfo.MatchType.TABLE_NAMES,
311:                            new ArrayList<String>(), end);
312:                } else if (lastKeyword.equalsIgnoreCase("WHERE")) {
313:                    // find out if it looks like
314:                    // 'SELECT x FROM A,B WHERE'
315:                    // or
316:                    // 'SELECT x FROM A,B WHERE A.x='x' AND/OR '
317:                    String tmpCommand = startOfCommand.substring(startOfCommand
318:                            .indexOf(lastKeyword)
319:                            + lastKeyword.length() + 1);
320:                    String upperCommandString = tmpCommand.toUpperCase();
321:                    String VAR = "(|" + TABLE + "\\.)(|" + COLUMN + ")";
322:                    String VALUE = "('.*'|[0-9]+|" + VAR + ")";
323:                    // VALUE COMPERATOR VALUE
324:                    // VALUE IN (.*)
325:
326:                    String regExp = "(|" + VALUE + "(|[\\s]*" + COMPARATOR
327:                            + "[\\s]*(|" + VALUE + "(|([\\s]+(AND|OR)[\\s]+(|"
328:                            + VALUE + "(|[\\s]*" + COMPARATOR + "[\\s]*(|"
329:                            + VALUE + "))))*))|[\\s]*IN[\\s]*(.*)[\\s]*))";
330:                    if (upperCommandString.matches(regExp)) {
331:                        int lastIndex = tmpCommand.lastIndexOf(' ');
332:                        lastIndex = Math.max(lastIndex, tmpCommand
333:                                .lastIndexOf('.'));
334:                        lastIndex = Math.max(lastIndex, tmpCommand
335:                                .lastIndexOf('\t'));
336:                        lastIndex = Math.max(lastIndex, tmpCommand
337:                                .lastIndexOf('='));
338:                        lastIndex = Math.max(lastIndex, tmpCommand
339:                                .lastIndexOf('>'));
340:                        lastIndex = Math.max(lastIndex, tmpCommand
341:                                .lastIndexOf('>'));
342:                        String end = tmpCommand.substring(lastIndex + 1);
343:                        return new TabCompletionInfo(
344:                                TabCompletionInfo.MatchType.COLUMN_NAMES,
345:                                parseTableNames(commandInfo, commandPoint), end);
346:                    }
347:                    //else System.out.println("'"+upperCommandString +"'\n not matches\n"+regExp);
348:                    String end = "";
349:                    if (upperCommandString.matches(".*[\\s]+")) {
350:                        end = "";
351:                    } else {
352:                        int lastIndex = tmpCommand.lastIndexOf(' ');
353:                        lastIndex = Math.max(lastIndex, tmpCommand
354:                                .lastIndexOf('\t'));
355:                        lastIndex = Math.max(lastIndex, tmpCommand
356:                                .lastIndexOf('='));
357:                        lastIndex = Math.max(lastIndex, tmpCommand
358:                                .lastIndexOf('>'));
359:                        lastIndex = Math.max(lastIndex, tmpCommand
360:                                .lastIndexOf('>'));
361:                        end = tmpCommand.substring(lastIndex + 1);
362:                    }
363:                    return new TabCompletionInfo(
364:                            TabCompletionInfo.MatchType.SQL_KEYWORD, Arrays
365:                                    .asList(new String[] { "AND", "OR", "IN",
366:                                            "GROUP BY", "ORDER BY" }), end);
367:                } else if (lastKeyword.equalsIgnoreCase("GROUP BY")
368:                        || lastKeyword.equalsIgnoreCase("ORDER BY")) {
369:                    String upperStart = startOfCommand.toUpperCase();
370:                    String columns = startOfCommand.substring(
371:                            upperStart.indexOf("SELECT") + "SELECT".length(),
372:                            upperStart.indexOf("FROM")).replaceAll(" ", "");
373:                    return new TabCompletionInfo(
374:                            TabCompletionInfo.MatchType.COLUMN_NAMES, Arrays
375:                                    .asList(columns.split(",")));
376:                }
377:                return new TabCompletionInfo(
378:                        TabCompletionInfo.MatchType.UNKNOWN, Arrays
379:                                .asList(new String[0]));
380:            }
381:
382:            public static String getStartOfCommand(
383:                    List<? extends CharSequence> commandInfo, Point commandPoint) {
384:                StringBuffer buff = new StringBuffer();
385:                for (int i = 0; i <= commandPoint.y; i++) {
386:                    if (i == commandPoint.y) {
387:                        buff.append(commandInfo.get(i).subSequence(0,
388:                                commandPoint.x));
389:                    } else {
390:                        buff.append(commandInfo.get(i));
391:                    }
392:                    if (i < commandPoint.y && commandPoint.x > 0) {
393:                        buff.append(' ');
394:                    }
395:                }
396:                return buff.toString();
397:            }
398:
399:            public static int getLastBreakIndex(String s) {
400:                int spaceIndex = 0;
401:                char[] breakCharacters = new char[] { ' ', '\t', '.', ',' };
402:                for (int i = 0; i < breakCharacters.length; i++) {
403:                    int tmpIndex = s.lastIndexOf(breakCharacters[i]);
404:                    if (tmpIndex > 0 && tmpIndex > spaceIndex) {
405:                        spaceIndex = tmpIndex;
406:                    }
407:                }
408:                return spaceIndex;
409:            }
410:        }
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