Source Code Cross Referenced for TableRelation.java in  » GIS » deegree » org » deegree » io » datastore » schema » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » deegree » org.deegree.io.datastore.schema 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        //$HeadURL: https://svn.wald.intevation.org/svn/deegree/base/trunk/src/org/deegree/io/datastore/schema/TableRelation.java $
002:        /*----------------    FILE HEADER  ------------------------------------------
003:
004:         This file is part of deegree.
005:         Copyright (C) 2001-2008 by:
006:         EXSE, Department of Geography, University of Bonn
007:         http://www.giub.uni-bonn.de/deegree/
008:         lat/lon GmbH
009:         http://www.lat-lon.de
010:
011:         This library is free software; you can redistribute it and/or
012:         modify it under the terms of the GNU Lesser General Public
013:         License as published by the Free Software Foundation; either
014:         version 2.1 of the License, or (at your option) any later version.
015:
016:         This library is distributed in the hope that it will be useful,
017:         but WITHOUT ANY WARRANTY; without even the implied warranty of
018:         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
019:         Lesser General Public License for more details.
020:
021:         You should have received a copy of the GNU Lesser General Public
022:         License along with this library; if not, write to the Free Software
023:         Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
024:
025:         Contact:
026:
027:         Andreas Poth
028:         lat/lon GmbH
029:         Aennchenstraße 19
030:         53177 Bonn
031:         Germany
032:         E-Mail: poth@lat-lon.de
033:
034:         Prof. Dr. Klaus Greve
035:         Department of Geography
036:         University of Bonn
037:         Meckenheimer Allee 166
038:         53115 Bonn
039:         Germany
040:         E-Mail: greve@giub.uni-bonn.de
041:        
042:         ---------------------------------------------------------------------------*/
043:        package org.deegree.io.datastore.schema;
044:
045:        import org.deegree.io.datastore.DatastoreTransaction;
046:        import org.deegree.io.datastore.idgenerator.IdGenerationException;
047:        import org.deegree.io.datastore.idgenerator.IdGenerator;
048:        import org.deegree.io.datastore.schema.content.MappingField;
049:
050:        /**
051:         * Describes a relation (join condition) between two database tables.
052:         * 
053:         * @author <a href="mailto:schneider@lat-lon.de">Markus Schneider </a>
054:         * @author last edited by: $Author: apoth $
055:         * 
056:         * @version $Revision: 9342 $, $Date: 2007-12-27 04:32:57 -0800 (Thu, 27 Dec 2007) $
057:         */
058:        public class TableRelation {
059:
060:            /**
061:             * Used to represent the foreign key position.
062:             */
063:            public static enum FK_INFO {
064:
065:                /**
066:                 * No foreign key information available (sufficient for read access).
067:                 */
068:                noFKInfo,
069:
070:                /**
071:                 * Foreign stored in 'To'-table, primary key in 'From'-table.
072:                 */
073:                fkIsToField,
074:
075:                /**
076:                 * Foreign stored in 'From'-table, primary key in 'To'-table.
077:                 */
078:                fkIsFromField
079:            }
080:
081:            private MappingField[] fromFields;
082:
083:            private MappingField[] toFields;
084:
085:            private FK_INFO fkInfo;
086:
087:            private IdGenerator idGenerator;
088:
089:            /**
090:             * Initializes a newly created <code>TableRelation</code> instance with the given
091:             * parameters. 
092:             *  
093:             * @param fromFields
094:             * @param toFields
095:             * @param fkInfo
096:             * @param idGenerator
097:             */
098:            public TableRelation(MappingField[] fromFields,
099:                    MappingField[] toFields, FK_INFO fkInfo,
100:                    IdGenerator idGenerator) {
101:                if (fromFields.length < 1) {
102:                    throw new IllegalArgumentException(
103:                            "A relation between two tables must have at least one 'from' field.");
104:                }
105:                if (toFields.length < 1) {
106:                    throw new IllegalArgumentException(
107:                            "A relation between two tables must have at least one 'to' field.");
108:                }
109:                if (fromFields.length != toFields.length) {
110:                    throw new IllegalArgumentException(
111:                            "A relation between two tables must have the same number of 'from' and 'to' fields.");
112:                }
113:                this .fromFields = fromFields;
114:                this .toFields = toFields;
115:                this .fkInfo = fkInfo;
116:                this .idGenerator = idGenerator;
117:            }
118:
119:            /**
120:             * Returns the name of the table where the relation starts ('From'-table).
121:             * 
122:             * @return the name of the table where the relation starts ('From'-table)
123:             */
124:            public String getFromTable() {
125:                return fromFields[0].getTable();
126:            }
127:
128:            /**
129:             * Returns the name of the table where the relation ends ('To'-table).
130:             * 
131:             * @return the name of the table where the relation ends ('To'-table)
132:             */
133:            public String getToTable() {
134:                return toFields[0].getTable();
135:            }
136:
137:            /**
138:             * Returns the {@link MappingField}s that constitute the key in the 'From'-table.
139:             *  
140:             * @return the MappingFields that constitute the key in the 'From'-table
141:             */
142:            public MappingField[] getFromFields() {
143:                return this .fromFields;
144:            }
145:
146:            /**
147:             * Returns the {@link MappingField}s that constitute the key in the 'To'-table.
148:             *  
149:             * @return the MappingFields that constitute the key in the 'To'-table
150:             */
151:            public MappingField[] getToFields() {
152:                return this .toFields;
153:            }
154:
155:            /**
156:             * Returns the foreign key position.
157:             * 
158:             * @return the foreign key position
159:             */
160:            public FK_INFO getFKInfo() {
161:                return this .fkInfo;
162:            }
163:
164:            /**
165:             * Returns whether the foreign key is stored in the 'From'-table.
166:             * 
167:             * @return true, if foreign key information is available and foreign key is in 'From'-table,
168:             *         false otherwise
169:             */
170:            public boolean isFromFK() {
171:                boolean isFromFK = false;
172:                switch (this .fkInfo) {
173:                case fkIsFromField: {
174:                    isFromFK = true;
175:                    break;
176:                }
177:                case fkIsToField: {
178:                    isFromFK = false;
179:                    break;
180:                }
181:                default: {
182:                    throw new RuntimeException(
183:                            "No foreign key information available for relation: "
184:                                    + this );
185:                }
186:                }
187:                return isFromFK;
188:            }
189:
190:            /**
191:             * Returns the {@link IdGenerator} instance that may be used to generate new primary keys.
192:             * 
193:             * @return IdGenerator instance that may be used to generate new primary keys
194:             */
195:            public IdGenerator getIdGenerator() {
196:                return this .idGenerator;
197:            }
198:
199:            /**
200:             * Returns a new primary key generated by the associated {@link IdGenerator}.
201:             * 
202:             * @param ta
203:             * @return a new primary key
204:             * @throws IdGenerationException
205:             */
206:            public Object getNewPK(DatastoreTransaction ta)
207:                    throws IdGenerationException {
208:                return this .idGenerator.getNewId(ta);
209:            }
210:
211:            @Override
212:            public String toString() {
213:                StringBuffer sb = new StringBuffer();
214:                sb.append(getFromTable());
215:                if (this .fkInfo == FK_INFO.fkIsFromField) {
216:                    sb.append(" (fk) ");
217:                }
218:                sb.append(" -> ");
219:                sb.append(getToTable());
220:                if (this .fkInfo == FK_INFO.fkIsToField) {
221:                    sb.append(" (fk) ");
222:                }
223:                sb.append(" (");
224:                for (int i = 0; i < fromFields.length; i++) {
225:                    sb.append(fromFields[i]);
226:                    sb.append("=");
227:                    sb.append(toFields[i]);
228:                    if (i != fromFields.length - 1) {
229:                        sb.append(" AND ");
230:                    }
231:                }
232:                sb.append(")");
233:                return sb.toString();
234:            }
235:        }
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