/*
 * Copyright 2004-2011 the Seasar Foundation and the Others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.seasar.dao.impl;

import java.sql.ResultSet;
import java.sql.SQLException;

import org.seasar.dao.NotSingleResultRuntimeException;
import org.seasar.extension.jdbc.PropertyType;
import org.seasar.framework.log.Logger;

public class MapResultSetHandler extends AbstractMapResultSetHandler {

    private static final Logger logger = Logger
            .getLogger(MapResultSetHandler.class);

    public MapResultSetHandler() {
    }

    /**
     * @see org.seasar.extension.jdbc.ResultSetHandler#handle(java.sql.ResultSet)
     */
    public Object handle(ResultSet resultSet) throws SQLException {
        if (resultSet.next()) {
            PropertyType[] propertyTypes = createPropertyTypes(resultSet
                    .getMetaData());
            Object row = createRow(resultSet, propertyTypes);
            if (resultSet.next()){
                handleNotSingleResult();
            }
            return row;
        }
        return null;
    }

    /**
     * 結果が1件でない場合の処理を行います。 デフォルトでは警告ログを出力します。
     */
    protected void handleNotSingleResult() {
        logger.log("WDAO0003", null);
    }

    /**
     * 結果が2件以上のときに例外をスローする{@link ObjectResultSetHandler}です。
     * 
     * @author azusa
     * 
     */
    public static class RestrictMapResultSetHandler extends MapResultSetHandler {

        public RestrictMapResultSetHandler() {
            super();
        }

        protected void handleNotSingleResult() {
            throw new NotSingleResultRuntimeException();
        }

    }
}