/*
 * Copyright 2012-2014 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat 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, or (at your
 * option) any later version.
 *
 * Thermostat 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 Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.storage.internal.statement;

import java.util.ArrayList;
import java.util.List;

import com.redhat.thermostat.storage.core.IllegalPatchException;
import com.redhat.thermostat.storage.core.PreparedParameter;

/**
 * Represents a sort expression of a prepared statement's parse tree.
 *
 */
class SortExpression implements Printable, Patchable {
    
    List<SortMember> members = new ArrayList<>();
    
    public void addMember(SortMember member) {
        members.add(member);
    }
    
    public List<SortMember> getMembers() {
        return members;
    }

    @Override
    public void print(int level) {
        System.out.print("SORT: ");
        for (int i = 0; i < members.size(); i++) {
            SortMember member = members.get(i);
            member.print(level);
            if (i < members.size() - 1) {
                System.out.print(", ");
            }
        }
        System.out.println("");
    }

    @Override
    public PatchedSortExpression patch(PreparedParameter[] params)
            throws IllegalPatchException {
        List<PatchedSortMember> patchedMembers = new ArrayList<>();
        for (SortMember member: members) {
            PatchedSortMemberExpression expn = member.patch(params);
            patchedMembers.add(expn.getSortMember());
        }
        // worked so far (no exceptions) create impl exp and return
        PatchedSortMember[] members = patchedMembers.toArray(new PatchedSortMember[0]);
        return new PatchedSortExpressionImpl(members);
    }

    private static class PatchedSortExpressionImpl implements PatchedSortExpression {

        private final PatchedSortMember[] members;
        
        private PatchedSortExpressionImpl(PatchedSortMember[] members) {
            this.members = members;
        }
        
        @Override
        public PatchedSortMember[] getSortMembers() {
            return members;
        }
        
        
    }
}

