Source Code Cross Referenced for TextTable.java in  » Database-DBMS » hsql » org » hsqldb » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » hsql » org.hsqldb 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Copyright (c) 2001-2005, The HSQL Development Group
002:         * All rights reserved.
003:         *
004:         * Redistribution and use in source and binary forms, with or without
005:         * modification, are permitted provided that the following conditions are met:
006:         *
007:         * Redistributions of source code must retain the above copyright notice, this
008:         * list of conditions and the following disclaimer.
009:         *
010:         * Redistributions in binary form must reproduce the above copyright notice,
011:         * this list of conditions and the following disclaimer in the documentation
012:         * and/or other materials provided with the distribution.
013:         *
014:         * Neither the name of the HSQL Development Group nor the names of its
015:         * contributors may be used to endorse or promote products derived from this
016:         * software without specific prior written permission.
017:         *
018:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
019:         * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
020:         * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
021:         * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
022:         * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
023:         * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
024:         * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025:         * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
026:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028:         * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029:         */
030:
031:        package org.hsqldb;
032:
033:        import org.hsqldb.lib.FileUtil;
034:        import org.hsqldb.lib.StringConverter;
035:        import org.hsqldb.persist.TextCache;
036:
037:        // tony_lai@users 20020820 - patch 595099 - user define PK name
038:
039:        /**
040:         * Subclass of Table to handle TEXT data source. <p>
041:         *
042:         * Extends Table to provide the notion of an SQL base table object whose
043:         * data is read from and written to a text format data file.
044:         *
045:         * @author sqlbob@users (RMP)
046:         * @version    1.8.0
047:         */
048:        class TextTable extends org.hsqldb.Table {
049:
050:            private String dataSource = "";
051:            private boolean isReversed = false;
052:            private boolean isConnected = false;
053:
054:            /**
055:             *  Constructs a new TextTable from the given arguments.
056:             *
057:             * @param  db the owning database
058:             * @param  name the table's HsqlName
059:             * @param  type (normal or temp text table)
060:             * @param  sessionid the id of the owning session (for temp table)
061:             * @exception  HsqlException  Description of the Exception
062:             */
063:            TextTable(Database db, HsqlNameManager.HsqlName name, int type)
064:                    throws HsqlException {
065:                super (db, name, type);
066:            }
067:
068:            /**
069:             * common handling for all errors during <code>connect</code>
070:             */
071:            private void onConnectError(Session session) {
072:
073:                if (cache != null) {
074:                    try {
075:                        cache.close(false);
076:                    } catch (HsqlException ex) {
077:                    }
078:                }
079:
080:                cache = null;
081:
082:                clearAllRows(session);
083:            }
084:
085:            public boolean isConnected() {
086:                return isConnected;
087:            }
088:
089:            /**
090:             * connects to the data source
091:             */
092:            public void connect(Session session) throws HsqlException {
093:                connect(session, isReadOnly);
094:            }
095:
096:            /**
097:             * connects to the data source
098:             */
099:            private void connect(Session session, boolean withReadOnlyData)
100:                    throws HsqlException {
101:
102:                // Open new cache:
103:                if ((dataSource.length() == 0) || isConnected) {
104:
105:                    // nothing to do
106:                    return;
107:                }
108:
109:                try {
110:                    cache = database.logger.openTextCache(this , dataSource,
111:                            withReadOnlyData, isReversed);
112:
113:                    // read and insert all the rows from the source file
114:                    CachedRow row = null;
115:                    int nextpos = 0;
116:
117:                    if (((TextCache) cache).ignoreFirst) {
118:                        nextpos += ((TextCache) cache).readHeaderLine();
119:                    }
120:
121:                    while (true) {
122:                        row = (CachedRow) rowStore.get(nextpos);
123:
124:                        if (row == null) {
125:                            break;
126:                        }
127:
128:                        nextpos = row.getPos() + row.getStorageSize();
129:
130:                        row.setNewNodes();
131:                        insertFromTextSource(row);
132:                    }
133:                } catch (HsqlException e) {
134:                    int linenumber = cache == null ? 0 : ((TextCache) cache)
135:                            .getLineNumber();
136:
137:                    onConnectError(session);
138:
139:                    // everything is in order here.
140:                    // At this point table should either have a valid (old) data
141:                    // source and cache or have an empty source and null cache.
142:                    throw Trace.error(Trace.TEXT_FILE, new Object[] {
143:                            new Integer(linenumber), e.getMessage() });
144:                } catch (java.lang.RuntimeException t) {
145:                    int linenumber = cache == null ? 0 : ((TextCache) cache)
146:                            .getLineNumber();
147:
148:                    onConnectError(session);
149:
150:                    throw Trace.error(Trace.TEXT_FILE, new Object[] {
151:                            new Integer(linenumber),
152:                            t.getClass().getName() + ": " + t.getMessage() });
153:                }
154:
155:                isConnected = true;
156:
157:                setIsReadOnly(withReadOnlyData);
158:            }
159:
160:            /**
161:             * disconnects from the data source
162:             */
163:            public void disconnect(Session session) throws HsqlException {
164:
165:                // Close old cache:
166:                database.logger.closeTextCache(this );
167:
168:                cache = null;
169:
170:                clearAllRows(session);
171:
172:                isConnected = false;
173:            }
174:
175:            /**
176:             * This method does some of the work involved with managing the creation
177:             * and openning of the cache, the rest is done in Log.java and
178:             * TextCache.java.
179:             *
180:             * Better clarification of the role of the methods is needed.
181:             */
182:            private void openCache(Session session, String dataSourceNew,
183:                    boolean isReversedNew, boolean isReadOnlyNew)
184:                    throws HsqlException {
185:
186:                if (dataSourceNew == null) {
187:                    dataSourceNew = "";
188:                }
189:
190:                disconnect(session);
191:
192:                dataSource = dataSourceNew;
193:                isReversed = (isReversedNew && dataSource.length() > 0);
194:
195:                connect(session, isReadOnlyNew);
196:            }
197:
198:            /**
199:             * High level command to assign a data source to the table definition.
200:             * Reassigns only if the data source or direction has changed.
201:             */
202:            protected void setDataSource(Session session, String dataSourceNew,
203:                    boolean isReversedNew, boolean newFile)
204:                    throws HsqlException {
205:
206:                if (getTableType() == Table.TEMP_TEXT_TABLE) {
207:                    ;
208:                } else {
209:                    session.checkAdmin();
210:                }
211:
212:                dataSourceNew = dataSourceNew.trim();
213:
214:                if (newFile && FileUtil.exists(dataSourceNew)) {
215:                    throw Trace.error(Trace.TEXT_SOURCE_EXISTS, dataSourceNew);
216:                }
217:
218:                //-- Open if descending, direction changed, file changed, or not connected currently
219:                if (isReversedNew || (isReversedNew != isReversed)
220:                        || !dataSource.equals(dataSourceNew) || !isConnected) {
221:                    openCache(session, dataSourceNew, isReversedNew, isReadOnly);
222:                }
223:
224:                if (isReversed) {
225:                    setIsReadOnly(true);
226:                }
227:            }
228:
229:            protected String getDataSource() {
230:                return dataSource;
231:            }
232:
233:            protected boolean isDescDataSource() {
234:                return isReversed;
235:            }
236:
237:            public void setHeader(String header) throws HsqlException {
238:
239:                if (cache != null && ((TextCache) cache).ignoreFirst) {
240:                    ((TextCache) cache).setHeader(header);
241:
242:                    return;
243:                }
244:
245:                throw Trace.error(Trace.TEXT_TABLE_HEADER);
246:            }
247:
248:            public String getHeader() {
249:
250:                String header = cache == null ? null : ((TextCache) cache)
251:                        .getHeader();
252:
253:                return header == null ? null : StringConverter.toQuotedString(
254:                        header, '\"', true);
255:            }
256:
257:            /**
258:             * Used by INSERT, DELETE, UPDATE operations. This class will return
259:             * a more appropriate message when there is no data source.
260:             */
261:            void checkDataReadOnly() throws HsqlException {
262:
263:                if (dataSource.length() == 0) {
264:                    throw Trace.error(Trace.UNKNOWN_DATA_SOURCE);
265:                }
266:
267:                if (isDataReadOnly()) {
268:                    throw Trace.error(Trace.DATA_IS_READONLY);
269:                }
270:            }
271:
272:            public boolean isDataReadOnly() {
273:                return !isConnected() || super .isDataReadOnly();
274:            }
275:
276:            void setDataReadOnly(boolean value) throws HsqlException {
277:
278:                if (isReversed && value == false) {
279:                    throw Trace.error(Trace.DATA_IS_READONLY);
280:                }
281:
282:                openCache(null, dataSource, isReversed, value);
283:                setIsReadOnly(value);
284:            }
285:
286:            boolean isIndexCached() {
287:                return false;
288:            }
289:
290:            protected Table duplicate() throws HsqlException {
291:                return new TextTable(database, tableName, getTableType());
292:            }
293:
294:            void drop() throws HsqlException {
295:                openCache(null, "", false, false);
296:            }
297:
298:            void setIndexRoots(String s) throws HsqlException {
299:
300:                // do nothing
301:            }
302:        }
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