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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010 by Red Hat Inc and/or its affiliates or by
* third-party contributors as indicated by either @author tags or express
* copyright attribution statements applied by the authors. All
* third-party contributions are distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.metamodel.relational;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.hibernate.AssertionFailure;
import org.hibernate.MappingException;
import org.hibernate.dialect.Dialect;
import org.jboss.logging.Logger;
/**
* Models the notion of a foreign key.
*
* Note that this need not mean a physical foreign key; we just mean a relationship between 2 table
* specifications.
*
* @author Gavin King
* @author Steve Ebersole
*/
public class ForeignKey extends AbstractConstraint implements Constraint, Exportable {
private static final Logger LOG = Logger.getLogger( ForeignKey.class );
private static final String ON_DELETE = " on delete ";
private static final String ON_UPDATE = " on update ";
private final TableSpecification targetTable;
private List targetColumns;
private ReferentialAction deleteRule = ReferentialAction.NO_ACTION;
private ReferentialAction updateRule = ReferentialAction.NO_ACTION;
protected ForeignKey(TableSpecification sourceTable, TableSpecification targetTable, String name) {
super( sourceTable, name );
this.targetTable = targetTable;
}
protected ForeignKey(TableSpecification sourceTable, TableSpecification targetTable) {
this( sourceTable, targetTable, null );
}
public TableSpecification getSourceTable() {
return getTable();
}
public TableSpecification getTargetTable() {
return targetTable;
}
public Iterable getSourceColumns() {
return getColumns();
}
public Iterable getTargetColumns() {
return targetColumns == null
? getTargetTable().getPrimaryKey().getColumns()
: targetColumns;
}
@Override
public void addColumn(Column column) {
addColumnMapping( column, null );
}
public void addColumnMapping(Column sourceColumn, Column targetColumn) {
if ( targetColumn == null ) {
if ( targetColumns != null ) {
LOG.debugf(
"Attempt to map column [%s] to no target column after explicit target column(s) named for FK [name=%s]",
sourceColumn.toLoggableString(),
getName()
);
}
}
else {
checkTargetTable( targetColumn );
if ( targetColumns == null ) {
if (!internalColumnAccess().isEmpty()) {
LOG.debugf(
"Value mapping mismatch as part of FK [table=%s, name=%s] while adding source column [%s]",
getTable().toLoggableString(),
getName(),
sourceColumn.toLoggableString()
);
}
targetColumns = new ArrayList();
}
targetColumns.add( targetColumn );
}
internalAddColumn( sourceColumn );
}
private void checkTargetTable(Column targetColumn) {
if ( targetColumn.getTable() != getTargetTable() ) {
throw new AssertionFailure(
String.format(
"Unable to add column to constraint; tables [%s, %s] did not match",
targetColumn.getTable().toLoggableString(),
getTargetTable().toLoggableString()
)
);
}
}
@Override
public String getExportIdentifier() {
return getSourceTable().getLoggableValueQualifier() + ".FK-" + getName();
}
public ReferentialAction getDeleteRule() {
return deleteRule;
}
public void setDeleteRule(ReferentialAction deleteRule) {
this.deleteRule = deleteRule;
}
public ReferentialAction getUpdateRule() {
return updateRule;
}
public void setUpdateRule(ReferentialAction updateRule) {
this.updateRule = updateRule;
}
@Override
public String[] sqlDropStrings(Dialect dialect) {
return new String[] {
"alter table " +
getTable().getQualifiedName( dialect ) +
dialect.getDropForeignKeyString() +
getName()
};
}
public String sqlConstraintStringInAlterTable(Dialect dialect) {
String[] columnNames = new String[ getColumnSpan() ];
String[] targetColumnNames = new String[ getColumnSpan() ];
int i=0;
Iterator itTargetColumn = getTargetColumns().iterator();
for ( Column column : getColumns() ) {
if ( ! itTargetColumn.hasNext() ) {
throw new MappingException( "More constraint columns that foreign key target columns." );
}
columnNames[i] = column.getColumnName().encloseInQuotesIfQuoted( dialect );
targetColumnNames[i] = ( itTargetColumn.next() ).getColumnName().encloseInQuotesIfQuoted( dialect );
i++;
}
if ( itTargetColumn.hasNext() ) {
throw new MappingException( "More foreign key target columns than constraint columns." );
}
StringBuilder sb =
new StringBuilder(
dialect.getAddForeignKeyConstraintString(
getName(),
columnNames,
targetTable.getQualifiedName( dialect ),
targetColumnNames,
this.targetColumns == null
)
);
// TODO: If a dialect does not support cascade-delete, can it support other actions? (HHH-6428)
// For now, assume not.
if ( dialect.supportsCascadeDelete() ) {
if ( deleteRule != ReferentialAction.NO_ACTION ) {
sb.append( ON_DELETE ).append( deleteRule.getActionString() );
}
if ( updateRule != ReferentialAction.NO_ACTION ) {
sb.append( ON_UPDATE ).append( updateRule.getActionString() );
}
}
return sb.toString();
}
public static enum ReferentialAction {
NO_ACTION( "no action" ),
CASCADE( "cascade" ),
SET_NULL( "set null" ),
SET_DEFAULT( "set default" ),
RESTRICT( "restrict" );
private final String actionString;
private ReferentialAction(String actionString) {
this.actionString = actionString;
}
public String getActionString() {
return actionString;
}
}
}
