.hibernate-core.4.2.13.Final.source-code.order-by-render.g Maven / Gradle / Ivy
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{
/*
* 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;
}
/**
* Antlr grammar for rendering ORDER_BY trees as described by the {@link OrderByFragmentParser}
* @author Steve Ebersole
* @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
*/
class GeneratedOrderByFragmentRenderer extends TreeParser;
options {
importVocab=OrderByTemplate;
buildAST=false;
}
{
// the buffer to which we write the resulting SQL.
private StringBuilder buffer = new StringBuilder();
protected void out(String text) {
buffer.append( text );
}
protected void out(AST ast) {
buffer.append( ast.getText() );
}
/*package*/ String getRenderedFragment() {
return buffer.toString();
}
/**
* Implementation note: This is just a stub. OrderByFragmentRenderer contains the effective implementation.
*/
protected String renderOrderByElement(String expression, String collation, String order, String nulls) {
throw new UnsupportedOperationException("Concrete ORDER BY renderer should override this method.");
}
}
orderByFragment
: #(
ORDER_BY sortSpecification ( {out(", ");} sortSpecification)*
)
;
sortSpecification { String sortKeySpec = null; String collSpec = null; String ordSpec = null; String nullOrd = null; }
: #(
SORT_SPEC sortKeySpec=sortKeySpecification (collSpec=collationSpecification)? (ordSpec=orderingSpecification)? (nullOrd=nullOrdering)?
{ out( renderOrderByElement( sortKeySpec, collSpec, ordSpec, nullOrd ) ); }
)
;
sortKeySpecification returns [String sortKeyExp = null]
: #(SORT_KEY s:sortKey) { sortKeyExp = #s.getText(); }
;
sortKey
: IDENT
;
collationSpecification returns [String collSpecExp = null]
: c:COLLATE { collSpecExp = "collate " + #c.getText(); }
;
orderingSpecification returns [String ordSpecExp = null]
: o:ORDER_SPEC { ordSpecExp = #o.getText(); }
;
nullOrdering returns [String nullOrdExp = null]
: n:NULL_ORDER { nullOrdExp = #n.getText(); }
;