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This small library provides a facade to the commonly used NamedParameterJdbcTemplate of the Springs spring-jdbc library, offering fluent "Java8 like" style of writing SQL statements and commands. We do not aim to replace the NamedParameterJdbcTemplate, we just want to extend its functionality and try to offer a simpler way how to use it.

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/*
 * Copyright 2016 Bretislav Wajtr
 *
 * 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 com.clevergang.jdbc.fluent;

import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;

/**
 * Abstract class aggregating what all fluent builders have in common.
 *
 * @author Bretislav Wajtr
 */
abstract class AbstractFluentBuilder {

    private MapSqlParameterSource mapParameterSource;

    /**
     * Bind a parameter of this query/statement builder.
     * @param parameterName the name of the parameter
     * @param parameterValue the value of the parameter
     * @return a reference to the same query/statement builder,
     * so it's possible to chain several calls together
     */
    @SuppressWarnings("unchecked")
    public T bind(String parameterName, Object parameterValue) {
        getBoundParameters().addValue(parameterName, parameterValue);
        return (T) this;
    }

    /**
     * @return Returns a MapSqlParameterSource representing parameters which were already bound to this query/statement builder.
     * If no parameters were bound, then empty MapSqlParameterSource will be returned.
     */
    public MapSqlParameterSource getBoundParameters() {
        if (mapParameterSource == null) {
            mapParameterSource = new MapSqlParameterSource();
        }

        return mapParameterSource;
    }

}