001 //$HeadURL: svn+ssh://jwilden@svn.wald.intevation.org/deegree/base/branches/2.5_testing/src/org/deegree/io/datastore/sql/transaction/delete/TableReference.java $
002 /*----------------------------------------------------------------------------
003 This file is part of deegree, http://deegree.org/
004 Copyright (C) 2001-2009 by:
005 Department of Geography, University of Bonn
006 and
007 lat/lon GmbH
008
009 This library is free software; you can redistribute it and/or modify it under
010 the terms of the GNU Lesser General Public License as published by the Free
011 Software Foundation; either version 2.1 of the License, or (at your option)
012 any later version.
013 This library is distributed in the hope that it will be useful, but WITHOUT
014 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
015 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
016 details.
017 You should have received a copy of the GNU Lesser General Public License
018 along with this library; if not, write to the Free Software Foundation, Inc.,
019 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
020
021 Contact information:
022
023 lat/lon GmbH
024 Aennchenstr. 19, 53177 Bonn
025 Germany
026 http://lat-lon.de/
027
028 Department of Geography, University of Bonn
029 Prof. Dr. Klaus Greve
030 Postfach 1147, 53001 Bonn
031 Germany
032 http://www.geographie.uni-bonn.de/deegree/
033
034 e-mail: info@deegree.org
035 ----------------------------------------------------------------------------*/
036 package org.deegree.io.datastore.sql.transaction.delete;
037
038 import org.deegree.io.datastore.schema.TableRelation;
039 import org.deegree.io.datastore.schema.TableRelation.FK_INFO;
040 import org.deegree.io.datastore.schema.content.MappingField;
041
042 /**
043 * Represents a reference from a table to another table. This corresponds to a {@link TableRelation}
044 * declaration in an annotated GML schema, but with unambigious direction: the source (from) table
045 * contains the foreign key.
046 *
047 * @author <a href="mailto:schneider@lat-lon.de">Markus Schneider </a>
048 * @author last edited by: $Author: mschneider $
049 *
050 * @version $Revision: 18195 $, $Date: 2009-06-18 17:55:39 +0200 (Do, 18 Jun 2009) $
051 */
052 class TableReference {
053
054 private String fromTable;
055
056 private String toTable;
057
058 private MappingField[] fkColumns;
059
060 private MappingField[] keyColumns;
061
062 /**
063 * Creates a new <code>TableReference</code> instance from the given {@link TableRelation}.
064 *
065 * @param relation
066 */
067 TableReference( TableRelation relation ) {
068 if ( relation.getFKInfo() == FK_INFO.fkIsFromField ) {
069 this.fromTable = relation.getFromTable();
070 this.fkColumns = relation.getFromFields();
071 this.toTable = relation.getToTable();
072 this.keyColumns = relation.getToFields();
073 } else if ( relation.getFKInfo() == FK_INFO.fkIsToField ) {
074 this.fromTable = relation.getToTable();
075 this.fkColumns = relation.getToFields();
076 this.toTable = relation.getFromTable();
077 this.keyColumns = relation.getFromFields();
078 } else {
079 throw new IllegalArgumentException( "Cannot create TableReference without "
080 + "fk (foreign key) information: " + relation );
081 }
082 }
083
084 /**
085 * Returns the columns that build the foreign key (in the 'from' table).
086 *
087 * @return the columns that build the foreign key (in the 'from' table)
088 */
089 MappingField[] getFkColumns() {
090 return this.fkColumns;
091 }
092
093 /**
094 * Returns the name of the 'from' table.
095 *
096 * @return the name of the 'from' table
097 */
098 String getFromTable() {
099 return this.fromTable;
100 }
101
102 /**
103 * Returns the columns that build the key (in the 'to' table).
104 *
105 * @return the columns that build the key (in the 'to' table)
106 */
107 MappingField[] getKeyColumns() {
108 return this.keyColumns;
109 }
110
111 /**
112 * Returns the name of the 'to' table.
113 *
114 * @return the name of the 'to' table
115 */
116 String getToTable() {
117 return this.toTable;
118 }
119
120 @Override
121 public String toString() {
122 StringBuffer sb = new StringBuffer();
123 sb.append( this.fromTable );
124 sb.append( " [" );
125 for ( int i = 0; i < this.fkColumns.length; i++ ) {
126 sb.append( fkColumns[i].getField() );
127 if ( i != this.fkColumns.length - 1 ) {
128 sb.append( ',' );
129 }
130 }
131 sb.append( "] -> " );
132 sb.append( this.toTable );
133 sb.append( " [" );
134 for ( int i = 0; i < this.fkColumns.length; i++ ) {
135 sb.append( keyColumns[i].getField() );
136 if ( i != this.fkColumns.length - 1 ) {
137 sb.append( ',' );
138 }
139 }
140 sb.append( "]" );
141 return sb.toString();
142 }
143 }