/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
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;
}
}