/*
* 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.hql.ast.util;
import org.hibernate.hql.NameGenerator;
import org.hibernate.hql.antlr.SqlTokenTypes;
import org.hibernate.hql.ast.tree.HqlSqlWalkerNode;
import antlr.ASTFactory;
import antlr.collections.AST;
/**
* Provides utility methods for dealing with arrays of SQL column names.
*
* @author josh
*/
public final class ColumnHelper {
/**
* @deprecated (tell clover to filter this out)
*/
private ColumnHelper() {
}
public static void generateSingleScalarColumn(HqlSqlWalkerNode node, int i) {
ASTFactory factory = node.getASTFactory();
ASTUtil.createSibling( factory, SqlTokenTypes.SELECT_COLUMNS, " as " + NameGenerator.scalarName( i, 0 ), node );
}
/**
* Generates the scalar column AST nodes for a given array of SQL columns
*/
public static void generateScalarColumns(HqlSqlWalkerNode node, String sqlColumns[], int i) {
if ( sqlColumns.length == 1 ) {
generateSingleScalarColumn( node, i );
}
else {
ASTFactory factory = node.getASTFactory();
AST n = node;
n.setText( sqlColumns[0] ); // Use the DOT node to emit the first column name.
// Create the column names, folled by the column aliases.
for ( int j = 0; j < sqlColumns.length; j++ ) {
if ( j > 0 ) {
n = ASTUtil.createSibling( factory, SqlTokenTypes.SQL_TOKEN, sqlColumns[j], n );
}
n = ASTUtil.createSibling( factory, SqlTokenTypes.SELECT_COLUMNS, " as " + NameGenerator.scalarName( i, j ), n );
}
}
}
}