Source Code Cross Referenced for TTreeIndex.java in  » Database-DBMS » axion » org » axiondb » ext » indexes » ttree » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » axion » org.axiondb.ext.indexes.ttree 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: TTreeIndex.java,v 1.1 2005/06/30 01:14:44 ahimanikya Exp $
003:         * =======================================================================
004:         * Copyright (c) 2005 Axion Development Team.  All rights reserved.
005:         *  
006:         * Redistribution and use in source and binary forms, with or without 
007:         * modification, are permitted provided that the following conditions 
008:         * are met:
009:         * 
010:         * 1. Redistributions of source code must retain the above 
011:         *    copyright notice, this list of conditions and the following 
012:         *    disclaimer. 
013:         *   
014:         * 2. Redistributions in binary form must reproduce the above copyright 
015:         *    notice, this list of conditions and the following disclaimer in 
016:         *    the documentation and/or other materials provided with the 
017:         *    distribution. 
018:         *   
019:         * 3. The names "Tigris", "Axion", nor the names of its contributors may 
020:         *    not be used to endorse or promote products derived from this 
021:         *    software without specific prior written permission. 
022:         *  
023:         * 4. Products derived from this software may not be called "Axion", nor 
024:         *    may "Tigris" or "Axion" appear in their names without specific prior
025:         *    written permission.
026:         *   
027:         * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
028:         * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
029:         * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
030:         * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
031:         * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
032:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
033:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
034:         * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
035:         * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
036:         * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
037:         * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
038:         * =======================================================================
039:         */
040:
041:        package org.axiondb.ext.indexes.ttree;
042:
043:        import java.io.File;
044:
045:        import org.apache.commons.collections.primitives.ArrayIntList;
046:        import org.apache.commons.collections.primitives.IntCollections;
047:        import org.apache.commons.collections.primitives.IntListIterator;
048:        import org.apache.commons.logging.Log;
049:        import org.apache.commons.logging.LogFactory;
050:        import org.axiondb.AxionException;
051:        import org.axiondb.Column;
052:        import org.axiondb.Function;
053:        import org.axiondb.Index;
054:        import org.axiondb.IndexLoader;
055:        import org.axiondb.Row;
056:        import org.axiondb.RowIterator;
057:        import org.axiondb.RowSource;
058:        import org.axiondb.Table;
059:        import org.axiondb.engine.indexes.BaseIndex;
060:        import org.axiondb.engine.rowiterators.EmptyRowIterator;
061:        import org.axiondb.engine.rowiterators.LazyRowRowIterator;
062:        import org.axiondb.event.RowEvent;
063:        import org.axiondb.functions.ComparisonFunction;
064:        import org.axiondb.functions.EqualFunction;
065:        import org.axiondb.functions.GreaterThanFunction;
066:        import org.axiondb.functions.GreaterThanOrEqualFunction;
067:        import org.axiondb.functions.IsNotNullFunction;
068:        import org.axiondb.functions.IsNullFunction;
069:        import org.axiondb.functions.LessThanFunction;
070:        import org.axiondb.functions.LessThanOrEqualFunction;
071:
072:        /**
073:         * Base implementation for T-Tree based {@link Index indices}.
074:         * 
075:         * @version $Revision: 1.1 $ $Date: 2005/06/30 01:14:44 $
076:         * @author Pavels Andrejevs
077:         */
078:        public abstract class TTreeIndex extends BaseIndex implements  Index {
079:
080:            public static final int DEFAULT_MAXNODESIZE = 100;
081:
082:            protected static Log log = LogFactory.getLog(TTreeIndex.class);
083:
084:            protected TTree _tree;
085:
086:            // ---------------------------------------------------------------------
087:
088:            public TTreeIndex(String name, Column column, boolean unique)
089:                    throws AxionException {
090:                super (name, column, unique);
091:            }
092:
093:            public final void changeRowId(Table table, Row row, int oldId,
094:                    int newId) throws AxionException {
095:                try {
096:                    int colnum = table.getColumnIndex(getIndexedColumn()
097:                            .getName());
098:                    Object key = row.get(colnum);
099:                    _tree.replace(key, oldId, newId);
100:
101:                } catch (AxionException e) {
102:                    String msg = "Unable to change row id";
103:                    log.error(msg, e);
104:                    throw new AxionException(msg, e);
105:                }
106:            }
107:
108:            public abstract IndexLoader getIndexLoader();
109:
110:            public final RowIterator getInorderRowIterator(RowSource source)
111:                    throws AxionException {
112:                IntListIterator resultIds = null;
113:                try {
114:                    resultIds = _tree.getInorderIterator();
115:                } catch (AxionException e) {
116:                    String msg = "Unable to retrieve values from index"
117:                            + getName();
118:                    log.error(msg, e);
119:                    throw new AxionException(msg, e);
120:                }
121:                return new LazyRowRowIterator(source, resultIds, _tree.size());
122:            }
123:
124:            public final RowIterator getRowIterator(RowSource source,
125:                    Function function, Object value) throws AxionException {
126:
127:                IntListIterator resultIds = null;
128:                if (function instanceof  ComparisonFunction) {
129:                    Object convertedValue = getIndexedColumn().getDataType()
130:                            .convert(value);
131:
132:                    if (null == convertedValue) {
133:                        // null fails all comparisions I support
134:                        return EmptyRowIterator.INSTANCE;
135:                    }
136:
137:                    if (function instanceof  EqualFunction) {
138:                        if (!isUnique()) {
139:                            resultIds = _tree.getAll(convertedValue);
140:                        } else {
141:                            Integer result = _tree.get(convertedValue);
142:                            if (result == null) {
143:                                resultIds = IntCollections
144:                                        .getEmptyIntListIterator();
145:                            } else {
146:                                resultIds = IntCollections
147:                                        .singletonIntListIterator(result
148:                                                .intValue());
149:                            }
150:                        }
151:                    } else if (function instanceof  LessThanFunction) {
152:                        resultIds = _tree.select(null, convertedValue, false);
153:                    } else if (function instanceof  LessThanOrEqualFunction) {
154:                        resultIds = _tree.select(null, convertedValue, true);
155:                    } else if (function instanceof  GreaterThanFunction) {
156:                        resultIds = _tree.select(convertedValue, null, false);
157:                    } else if (function instanceof  GreaterThanOrEqualFunction) {
158:                        resultIds = _tree.select(convertedValue, null, true);
159:                    } else {
160:                        throw new AxionException("Unsupported function "
161:                                + function);
162:                    }
163:                } else if (function instanceof  IsNotNullFunction) {
164:                    resultIds = _tree.getAllNotNull();
165:                } else if (function instanceof  IsNullFunction) {
166:                    resultIds = _tree.getAllNull();
167:                } else {
168:                    throw new AxionException("Unsupported function " + function);
169:                }
170:
171:                ArrayIntList ids = new ArrayIntList();
172:                while (resultIds.hasNext()) {
173:                    ids.add(resultIds.next());
174:                }
175:                return new LazyRowRowIterator(source, ids.listIterator(), ids
176:                        .size());
177:            }
178:
179:            public TTree getTTree() {
180:                return _tree;
181:            }
182:
183:            public String getType() {
184:                return Index.TTREE;
185:            }
186:
187:            public final void rowDeleted(RowEvent event) throws AxionException {
188:                String colName = getIndexedColumn().getName();
189:                int colIndex = event.getTable().getColumnIndex(colName);
190:                Object key = event.getOldRow().get(colIndex);
191:                key = (key == null) ? _tree.getNullKey() : key;
192:                int rowId = event.getOldRow().getIdentifier();
193:
194:                try {
195:                    _tree.delete(key, rowId);
196:                } catch (AxionException e) {
197:                    String msg = "Unable to delete from index " + getName();
198:                    log.error(msg, e);
199:                    throw new AxionException(msg, e);
200:                }
201:            }
202:
203:            // TABLE MODIFICATION LISTENER
204:            // ---------------------------------------------------------------------
205:
206:            public final void rowInserted(RowEvent event) throws AxionException {
207:                String colName = getIndexedColumn().getName();
208:                int colIndex = event.getTable().getColumnIndex(colName);
209:                Object key = event.getNewRow().get(colIndex);
210:                int rowId = event.getNewRow().getIdentifier();
211:
212:                try {
213:                    if (key == null) {
214:                        key = _tree.getNullKey();
215:                        _tree.insert(key, rowId, false);
216:                    } else {
217:                        _tree.insert(key, rowId, isUnique());
218:                    }
219:                } catch (AxionException e) {
220:                    String msg = "Unable to insert into index " + getName();
221:                    log.error(msg, e);
222:                    throw new AxionException(msg, e);
223:                }
224:            }
225:
226:            public final void rowUpdated(RowEvent event) throws AxionException {
227:                rowDeleted(event);
228:                rowInserted(event);
229:            }
230:
231:            public void save(File dataDirectory) throws AxionException {
232:                getIndexLoader().saveIndex(this , dataDirectory);
233:            }
234:
235:            public void saveAfterTruncate(File dataDirectory)
236:                    throws AxionException {
237:                getIndexLoader().saveIndexAfterTruncate(this , dataDirectory);
238:            }
239:
240:            public boolean supportsFunction(Function fn) {
241:                if (fn instanceof  EqualFunction) {
242:                    return true;
243:                } else if (fn instanceof  LessThanFunction) {
244:                    return true;
245:                } else if (fn instanceof  LessThanOrEqualFunction) {
246:                    return true;
247:                } else if (fn instanceof  GreaterThanFunction) {
248:                    return true;
249:                } else if (fn instanceof  GreaterThanOrEqualFunction) {
250:                    return true;
251:                } else if (fn instanceof  IsNotNullFunction) {
252:                    return true;
253:                } else if (fn instanceof  IsNullFunction) {
254:                    return true;
255:                } else {
256:                    return false;
257:                }
258:            }
259:
260:            public void truncate() throws AxionException {
261:                _tree.truncate();
262:            }
263:
264:        }
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