package com.dbxml.db.common.query;

/*
 * dbXML - Native XML Database
 * Copyright (C) 1999-2004  The dbXML Group, L.L.C.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Id: QueryResolverBase.java,v 1.2 2004/02/12 00:17:56 bradford Exp $
 */

import com.dbxml.db.core.Collection;
import com.dbxml.db.core.data.Key;
import com.dbxml.db.core.query.*;
import com.dbxml.db.core.transaction.Transaction;
import com.dbxml.util.SimpleConfigurable;
import com.dbxml.xml.NamespaceMap;

/**
 * QueryResolverBase
 */

public abstract class QueryResolverBase extends SimpleConfigurable implements QueryResolver {
   protected QueryEngine engine;

   public void setQueryEngine(QueryEngine engine) {
      this.engine = engine;
   }

   public Query compileQuery(Collection context, String query, NamespaceMap nsMap, Key[] keys) throws QueryException {
      QueryBase q = createQuery(context, query, nsMap, keys);
      q.compileQuery();
      return q;
   }

   public ResultSet query(Transaction tx, Collection context, String query, NamespaceMap nsMap, Key[] keys) throws QueryException {
      QueryBase q = createQuery(context, query, nsMap, keys);
      q.compileQuery();
      return q.execute(tx);
   }

   public abstract QueryBase createQuery(Collection context, String query, NamespaceMap nsMap, Key[] keys) throws QueryException;
}
