Source Code Cross Referenced for ChildTableUpdater.java in  » Database-DBMS » axion » org » axiondb » engine » commands » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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


001:        /*
002:         * $Id: ChildTableUpdater.java,v 1.1 2005/12/20 18:32:28 ahimanikya Exp $
003:         * =======================================================================
004:         * Copyright (c) 2005-2006 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:        package org.axiondb.engine.commands;
041:
042:        import java.util.Iterator;
043:        import java.util.List;
044:
045:        import org.axiondb.AxionException;
046:        import org.axiondb.ColumnIdentifier;
047:        import org.axiondb.Database;
048:        import org.axiondb.Literal;
049:        import org.axiondb.Row;
050:        import org.axiondb.RowDecorator;
051:        import org.axiondb.RowIterator;
052:        import org.axiondb.Selectable;
053:        import org.axiondb.Table;
054:        import org.axiondb.TableIdentifier;
055:        import org.axiondb.constraints.ForeignKeyConstraint;
056:        import org.axiondb.engine.rows.SimpleRow;
057:        import org.axiondb.functions.AndFunction;
058:        import org.axiondb.functions.EqualFunction;
059:
060:        /**
061:         * Update/Delete Child rows for a given relation.
062:         * 
063:         * @author Ahimanikya Satapathy
064:         */
065:        public abstract class ChildTableUpdater extends BaseAxionCommand {
066:
067:            protected void deleteOrSetNullChildRows(Database db,
068:                    Table parentTable, RowDecorator dec) throws AxionException {
069:                for (Iterator iter = parentTable.getConstraints(); iter
070:                        .hasNext();) {
071:                    Object constraint = iter.next();
072:                    if (constraint instanceof  ForeignKeyConstraint) {
073:                        ForeignKeyConstraint fk = (ForeignKeyConstraint) constraint;
074:                        deleteOrSetNullChildRows(db, parentTable, dec, fk);
075:                    }
076:                }
077:            }
078:
079:            protected void deleteOrSetNullChildRows(Database db,
080:                    Table parentTable, RowDecorator dec, ForeignKeyConstraint fk)
081:                    throws AxionException {
082:                // Check whether Child table has a row that is refering row to be deleted
083:                // If ON DELETE option is used we can either delete or set null the child row
084:                Selectable filter = null;
085:                if (parentTable.getName().equals(fk.getParentTableName())) {
086:                    List parentCols = fk.getParentTableColumns();
087:                    List childCols = fk.getChildTableColumns();
088:                    Table childTable = db.getTable(fk.getChildTableName());
089:
090:                    filter = buildFilter(dec, parentCols);
091:                    RowIterator matching = getRowIterator(db,
092:                            new TableIdentifier(fk.getChildTableName()),
093:                            childTable, filter, false, dec);
094:                    if (matching.hasNext()) {
095:                        if (fk.getOnDeleteActionType() == ForeignKeyConstraint.CASCADE) {
096:                            deleteMatchingChildRows(matching);
097:                        } else if (fk.getOnDeleteActionType() == ForeignKeyConstraint.SETNULL) {
098:                            setNullForMatchingChildRows(childCols, childTable,
099:                                    matching);
100:                        } else if (fk.getOnDeleteActionType() == ForeignKeyConstraint.SETDEFAULT) {
101:                            setDefaultForMatchingChildRows(childCols,
102:                                    childTable, matching);
103:                        }
104:                    }
105:                }
106:            }
107:
108:            protected void updateOrSetNullChildRows(Database db,
109:                    Table parentTable, Row parentOldRow, Row parentNewRow)
110:                    throws AxionException {
111:                for (Iterator iter = parentTable.getConstraints(); iter
112:                        .hasNext();) {
113:                    Object constraint = iter.next();
114:                    if (constraint instanceof  ForeignKeyConstraint) {
115:                        ForeignKeyConstraint fk = (ForeignKeyConstraint) constraint;
116:                        updateOrSetNullChildRows(db, parentTable, parentOldRow,
117:                                parentNewRow, fk);
118:                    }
119:                }
120:            }
121:
122:            protected void updateOrSetNullChildRows(Database db,
123:                    Table parentTable, Row parentOldRow, Row parentNewRow,
124:                    ForeignKeyConstraint fk) throws AxionException {
125:                // Check whether Child table has a row that is refering row to be deleted
126:                // If ON DELETE option is used we can either delete or set null the child row
127:                Selectable filter = null;
128:                if (parentTable.getName().equals(fk.getParentTableName())) {
129:                    RowDecorator dec = makeRowDecorator(parentTable);
130:                    dec.setRow(parentOldRow);
131:
132:                    List parentCols = fk.getParentTableColumns();
133:                    List childCols = fk.getChildTableColumns();
134:                    Table childTable = db.getTable(fk.getChildTableName());
135:
136:                    filter = buildFilter(dec, parentCols);
137:                    RowIterator matching = getRowIterator(db,
138:                            new TableIdentifier(fk.getChildTableName()),
139:                            childTable, filter, false, dec);
140:                    if (matching.hasNext()) {
141:                        if (fk.getOnDeleteActionType() == ForeignKeyConstraint.CASCADE) {
142:                            updateMatchingChildRows(parentTable, parentNewRow,
143:                                    parentCols, childCols, childTable, matching);
144:                        } else if (fk.getOnDeleteActionType() == ForeignKeyConstraint.SETNULL) {
145:                            setNullForMatchingChildRows(childCols, childTable,
146:                                    matching);
147:                        } else if (fk.getOnDeleteActionType() == ForeignKeyConstraint.SETDEFAULT) {
148:                            setDefaultForMatchingChildRows(childCols,
149:                                    childTable, matching);
150:                        }
151:                    }
152:                }
153:            }
154:
155:            private Selectable buildFilter(RowDecorator dec, List columns)
156:                    throws AxionException {
157:                Selectable filter = null;
158:                for (int i = 0, I = columns.size(); i < I; i++) {
159:                    Selectable sel = (Selectable) columns.get(i);
160:                    Object val = sel.evaluate(dec);
161:
162:                    EqualFunction function = new EqualFunction();
163:                    function.addArgument(sel);
164:                    function.addArgument(new Literal(val));
165:
166:                    if (null == filter) {
167:                        filter = function;
168:                    } else {
169:                        AndFunction fn = new AndFunction();
170:                        fn.addArgument(filter);
171:                        fn.addArgument(function);
172:                        filter = fn;
173:                    }
174:                }
175:                return filter;
176:            }
177:
178:            private void deleteMatchingChildRows(RowIterator matching)
179:                    throws AxionException {
180:                do {
181:                    matching.next();
182:                    matching.remove();
183:                } while (matching.hasNext());
184:            }
185:
186:            private void setDefaultForMatchingChildRows(List childCols,
187:                    Table childTable, RowIterator matching)
188:                    throws AxionException {
189:                do {
190:                    Row childOldrow = matching.next();
191:                    Row newrow = new SimpleRow(childOldrow);
192:                    for (int i = 0, I = childCols.size(); i < I; i++) {
193:                        ColumnIdentifier colid = ((ColumnIdentifier) childCols
194:                                .get(i));
195:                        int colndx = childTable.getColumnIndex(colid.getName());
196:                        newrow.set(colndx, childTable
197:                                .getColumn(colid.getName()).getDefault());
198:                    }
199:                    childTable.updateRow(childOldrow, newrow);
200:                } while (matching.hasNext());
201:            }
202:
203:            private void setNullForMatchingChildRows(List childCols,
204:                    Table childTable, RowIterator matching)
205:                    throws AxionException {
206:                do {
207:                    Row childOldrow = matching.next();
208:                    Row newrow = new SimpleRow(childOldrow);
209:                    for (int i = 0, I = childCols.size(); i < I; i++) {
210:                        ColumnIdentifier colid = ((ColumnIdentifier) childCols
211:                                .get(i));
212:                        int colndx = childTable.getColumnIndex(colid.getName());
213:                        newrow.set(colndx, null);
214:                    }
215:                    childTable.updateRow(childOldrow, newrow);
216:                } while (matching.hasNext());
217:            }
218:
219:            private void updateMatchingChildRows(Table parentTable,
220:                    Row parentNewRow, List parentCols, List childCols,
221:                    Table childTable, RowIterator matching)
222:                    throws AxionException {
223:                do {
224:                    Row childOldrow = matching.next();
225:                    Row newrow = new SimpleRow(childOldrow);
226:                    for (int i = 0, I = childCols.size(); i < I; i++) {
227:                        ColumnIdentifier colid = ((ColumnIdentifier) childCols
228:                                .get(i));
229:                        ColumnIdentifier pcolid = ((ColumnIdentifier) parentCols
230:                                .get(i));
231:                        int colndx = childTable.getColumnIndex(colid.getName());
232:                        int parentColndx = parentTable.getColumnIndex(pcolid
233:                                .getName());
234:                        newrow.set(colndx, parentNewRow.get(parentColndx));
235:                    }
236:                    childTable.updateRow(childOldrow, newrow);
237:                } while (matching.hasNext());
238:            }
239:
240:        }
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