/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008 Red Hat Inc. 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 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.sql.ordering.antlr;
import org.hibernate.NullPrecedence;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.hql.internal.ast.util.ASTPrinter;
import org.hibernate.internal.util.StringHelper;
import org.jboss.logging.Logger;
import antlr.collections.AST;
/**
* Extension of the Antlr-generated tree walker for rendering the parsed order-by tree back to String form.
* {@link #out(antlr.collections.AST)} is the sole semantic action here and it is used to utilize our
* split between text (tree debugging text) and "renderable text" (text to use during rendering).
*
* @author Steve Ebersole
*/
public class OrderByFragmentRenderer extends GeneratedOrderByFragmentRenderer {
private static final Logger LOG = Logger.getLogger( OrderByFragmentRenderer.class.getName() );
private static final ASTPrinter printer = new ASTPrinter( GeneratedOrderByFragmentRendererTokenTypes.class );
private final SessionFactoryImplementor sessionFactory;
public OrderByFragmentRenderer(SessionFactoryImplementor sessionFactory) {
this.sessionFactory = sessionFactory;
}
@Override
protected void out(AST ast) {
out( ( ( Node ) ast ).getRenderableText() );
}
// handle trace logging ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
private int traceDepth = 0;
@Override
public void traceIn(String ruleName, AST tree) {
if ( inputState.guessing > 0 ) {
return;
}
String prefix = StringHelper.repeat( '-', (traceDepth++ * 2) ) + "-> ";
String traceText = ruleName + " (" + buildTraceNodeName(tree) + ")";
LOG.trace( prefix + traceText );
}
private String buildTraceNodeName(AST tree) {
return tree == null
? "???"
: tree.getText() + " [" + printer.getTokenTypeName( tree.getType() ) + "]";
}
@Override
public void traceOut(String ruleName, AST tree) {
if ( inputState.guessing > 0 ) {
return;
}
String prefix = "<-" + StringHelper.repeat( '-', (--traceDepth * 2) ) + " ";
LOG.trace( prefix + ruleName );
}
@Override
protected String renderOrderByElement(String expression, String collation, String order, String nulls) {
final NullPrecedence nullPrecedence = NullPrecedence.parse( nulls, sessionFactory.getSettings().getDefaultNullPrecedence() );
return sessionFactory.getDialect().renderOrderByElement( expression, collation, order, nullPrecedence );
}
}