/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* 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.sql.ordering.antlr;
/**
* Models an ordering specification (<tt>ASCENDING</tt> or <tt>DESCENDING</tt>) within a {@link SortSpecification}.
*
* @author Steve Ebersole
*/
public class OrderingSpecification extends NodeSupport {
public static class Ordering {
public static final Ordering ASCENDING = new Ordering( "asc" );
public static final Ordering DESCENDING = new Ordering( "desc" );
private final String name;
private Ordering(String name) {
this.name = name;
}
}
private boolean resolved;
private Ordering ordering;
public Ordering getOrdering() {
if ( !resolved ) {
ordering = resolve( getText() );
resolved = true;
}
return ordering;
}
private static Ordering resolve(String text) {
if ( Ordering.ASCENDING.name.equals( text ) ) {
return Ordering.ASCENDING;
}
else if ( Ordering.DESCENDING.name.equals( text ) ) {
return Ordering.DESCENDING;
}
else {
throw new IllegalStateException( "Unknown ordering [" + text + "]" );
}
}
public String getRenderableText() {
return getOrdering().name;
}
}