org.protempa.backend.dsb.relationaldb.JDBCPositionFormat Maven / Gradle / Ivy

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Implements support for retrieving data from relational databases.

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/*
 * #%L
 * Protempa Commons Backend Provider
 * %%
 * Copyright (C) 2012 - 2013 Emory University
 * %%
 * 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.
 * #L%
 */
package org.protempa.backend.dsb.relationaldb;

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

/**
 * An interface for classes that parse data in a database into a PROTEMPA
 * position and format a PROTEMPA position into a string suitable for
 * inclusion in a SELECT statement executed via JDBC.
 * 
 * @author Andrew Post
 */
public interface JDBCPositionFormat {
    /**
     * Parses a column in a JDBC result set into a PROTEMPA position.
     * 
     * @param resultSet a {@link ResultSet}. Cannot be null.
     * @param columnIndex the index of the column to retrieve.
     * @param columnType the type of the column. A {@link java.sql.Types}.
     * @return a PROTEMPA position.
     * 
     * @throws SQLException if an error occurs accessing the result set or the
     * column cannot be parsed.
     */
    Long toPosition(ResultSet resultSet, int columnIndex, int columnType)
            throws SQLException;
    
    /**
     * Formats a PROTEMPA long as a string suitable for inclusion in a SELECT 
     * statement executed via JDBC.
     * 
     * @param position a PROTEMPA position.
     * @return a {@link String}.
     */
    String format(Long position);
}