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JDBC bridge for ClickHouse.

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/**
 * Copyright 2019-2021, Zhichun Wu
 *
 * 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 ru.yandex.clickhouse.jdbcbridge.core;

import java.util.Objects;

import io.vertx.core.json.JsonObject;

/**
 * This class defines a named query, which is composed of query, schema and
 * parameters.
 * 
 * @since 2.0
 */
public class NamedQuery extends NamedSchema {
    private static final String CONF_QUERY = "query";
    private static final String CONF_SCHEMA = "schema";
    private static final String CONF_PARAMETERS = "parameters";

    private final String query;
    private final String schema;

    private final QueryParameters parameters;

    @SuppressWarnings("unchecked")
    public static NamedQuery newInstance(Object... args) {
        if (Objects.requireNonNull(args).length < 2) {
            throw new IllegalArgumentException(
                    "In order to create named query, you need to specify at least ID and repository.");
        }

        String id = (String) args[0];
        Repository manager = (Repository) Objects.requireNonNull(args[1]);
        JsonObject config = args.length > 2 ? (JsonObject) args[2] : null;

        NamedQuery query = new NamedQuery(id, manager, config);
        query.validate();

        return query;
    }

    public NamedQuery(String id, Repository repo, JsonObject config) {
        super(id, repo, config);

        String str = config.getString(CONF_QUERY);
        this.query = Objects.requireNonNull(str);
        str = config.getString(CONF_SCHEMA);
        this.schema = str == null ? Utils.EMPTY_STRING : str;

        this.parameters = new QueryParameters(config.getJsonObject(CONF_PARAMETERS));
    }

    public String getQuery() {
        return this.query;
    }

    public String getSchema() {
        return this.schema;
    }

    public QueryParameters getParameters() {
        return this.parameters;
    }
}