/*
* 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 org.hibernate.dialect.Dialect;
import org.hibernate.internal.util.StringHelper;
/**
* Models a SQL <tt>INDEX</tt>
*
* @author Gavin King
* @author Steve Ebersole
*/
public class Index extends AbstractConstraint implements Constraint {
protected Index(Table table, String name) {
super( table, name );
}
@Override
public String getExportIdentifier() {
StringBuilder sb = new StringBuilder( getTable().getLoggableValueQualifier());
sb.append( ".IDX" );
for ( Column column : getColumns() ) {
sb.append( '_' ).append( column.getColumnName().getName() );
}
return sb.toString();
}
public String[] sqlCreateStrings(Dialect dialect) {
return new String[] {
buildSqlCreateIndexString(
dialect, getName(), getTable(), getColumns(), false
)
};
}
public static String buildSqlCreateIndexString(
Dialect dialect,
String name,
TableSpecification table,
Iterable<Column> columns,
boolean unique
) {
//TODO handle supportsNotNullUnique=false, but such a case does not exist in the wild so far
StringBuilder buf = new StringBuilder( "create" )
.append( unique ?
" unique" :
"" )
.append( " index " )
.append( dialect.qualifyIndexName() ?
name :
StringHelper.unqualify( name ) )
.append( " on " )
.append( table.getQualifiedName( dialect ) )
.append( " (" );
boolean first = true;
for ( Column column : columns ) {
if ( first ) {
first = false;
}
else {
buf.append( ", " );
}
buf.append( ( column.getColumnName().encloseInQuotesIfQuoted( dialect ) ) );
}
buf.append( ")" );
return buf.toString();
}
public String sqlConstraintStringInAlterTable(Dialect dialect) {
StringBuilder buf = new StringBuilder( " index (" );
boolean first = true;
for ( Column column : getColumns() ) {
if ( first ) {
first = false;
}
else {
buf.append( ", " );
}
buf.append( column.getColumnName().encloseInQuotesIfQuoted( dialect ) );
}
return buf.append( ')' ).toString();
}
public String[] sqlDropStrings(Dialect dialect) {
return new String[] {
new StringBuffer( "drop index " )
.append(
StringHelper.qualify(
getTable().getQualifiedName( dialect ),
getName()
)
).toString()
};
}
}