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97 lines
3.0 KiB
97 lines
3.0 KiB
7 years ago
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header
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{
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/*
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* Hibernate, Relational Persistence for Idiomatic Java
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*
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* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
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* indicated by the @author tags or express copyright attribution
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* statements applied by the authors. All third-party contributions are
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* distributed under license by Red Hat Middleware LLC.
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*
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* This copyrighted material is made available to anyone wishing to use, modify,
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* copy, or redistribute it subject to the terms and conditions of the GNU
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* Lesser General Public License, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this distribution; if not, write to:
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* Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02110-1301 USA
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*
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*/
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package com.fr.third.org.hibernate.sql.ordering.antlr;
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}
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/**
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* Antlr grammar for rendering <tt>ORDER_BY</tt> trees as described by the {@link OrderByFragmentParser}
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* @author Steve Ebersole
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* @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
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*/
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class GeneratedOrderByFragmentRenderer extends TreeParser;
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options {
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importVocab=OrderByTemplate;
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buildAST=false;
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}
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{
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// the buffer to which we write the resulting SQL.
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private StringBuilder buffer = new StringBuilder();
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protected void out(String text) {
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buffer.append( text );
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}
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protected void out(AST ast) {
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buffer.append( ast.getText() );
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}
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/*package*/ String getRenderedFragment() {
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return buffer.toString();
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}
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/**
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* Implementation note: This is just a stub. OrderByFragmentRenderer contains the effective implementation.
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*/
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protected String renderOrderByElement(String expression, String collation, String order, String nulls) {
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throw new UnsupportedOperationException("Concrete ORDER BY renderer should override this method.");
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}
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}
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orderByFragment
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: #(
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ORDER_BY sortSpecification ( {out(", ");} sortSpecification)*
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)
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;
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sortSpecification { String sortKeySpec = null; String collSpec = null; String ordSpec = null; String nullOrd = null; }
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: #(
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SORT_SPEC sortKeySpec=sortKeySpecification (collSpec=collationSpecification)? (ordSpec=orderingSpecification)? (nullOrd=nullOrdering)?
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{ out( renderOrderByElement( sortKeySpec, collSpec, ordSpec, nullOrd ) ); }
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)
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;
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sortKeySpecification returns [String sortKeyExp = null]
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: #(SORT_KEY s:sortKey) { sortKeyExp = #s.getText(); }
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;
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sortKey
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: IDENT
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;
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collationSpecification returns [String collSpecExp = null]
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: c:COLLATE { collSpecExp = "collate " + #c.getText(); }
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;
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orderingSpecification returns [String ordSpecExp = null]
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: o:ORDER_SPEC { ordSpecExp = #o.getText(); }
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;
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nullOrdering returns [String nullOrdExp = null]
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: n:NULL_ORDER { nullOrdExp = #n.getText(); }
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;
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