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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 com.arakelian.jdbc.handler;

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

/**
 * ResultSetHandler implementation that converts the current ResultSet row
 * into an Object[]. This class is thread safe.
 */
public class ArrayHandler implements ResultSetHandler {
    /**
     * Singleton instance
     */
    public static final ArrayHandler SINGLETON = new ArrayHandler();

    protected ArrayHandler() {
        // singleton pattern
    }

    /**
     * Places the column values from the current row into an Object[].
     *
     * @param rs
     *            ResultSet to process.
     * @return An Object[] or null if there are no rows in the ResultSet.
     *
     * @throws SQLException
     *             if a database access error occurs
     */
    @Override
    public Object[] handle(final ResultSet rs, final ResultSetMetaData rsmd) throws SQLException {
        if (rs.next()) {
            // convert row to array of objects
            final int cols = rsmd.getColumnCount();
            final Object[] result = new Object[cols];
            for (int i = 0; i < cols; i++) {
                result[i] = rs.getObject(i + 1);
            }
            return result;
        } else {
            return null;
        }
    }

    @Override
    public boolean wasLast(final Object[] result) {
        return result == null;
    }
}