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SQL support for Querydsl
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/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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.querydsl.sql.teradata;

import com.querydsl.sql.Configuration;
import com.querydsl.sql.SQLBindings;
import com.querydsl.sql.SQLTemplates;
import com.querydsl.sql.dml.AbstractSQLClause;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.function.Supplier;

/**
 * {@code SetQueryBandClause} provides support for Teradata specific set query_band executions.
 *
 * @author tiwe
 */
public class SetQueryBandClause extends AbstractSQLClause {

  private boolean forSession = true;

  private final Map values = new LinkedHashMap<>();

  private transient String queryString;

  private transient String parameter;

  public SetQueryBandClause(Connection connection, SQLTemplates templates) {
    this(connection, new Configuration(templates));
  }

  public SetQueryBandClause(Connection connection, Configuration configuration) {
    super(configuration, connection);
  }

  public SetQueryBandClause(Supplier connection, Configuration configuration) {
    super(configuration, connection);
  }

  public SetQueryBandClause forSession() {
    queryString = null;
    forSession = true;
    return this;
  }

  public SetQueryBandClause forTransaction() {
    queryString = null;
    forSession = false;
    return this;
  }

  public SetQueryBandClause set(String key, String value) {
    queryString = null;
    values.put(key, value);
    return this;
  }

  public SetQueryBandClause set(Map values) {
    queryString = null;
    this.values.putAll(values);
    return this;
  }

  @Override
  public void clear() {
    values.clear();
  }

  @Override
  public long execute() {
    PreparedStatement stmt = null;
    try {
      stmt = connection().prepareStatement(toString());
      if (parameter != null) {
        stmt.setString(1, parameter);
      }
      return 1;
    } catch (SQLException e) {
      var bindings =
          parameter != null
              ? Collections.singletonList((Object) parameter)
              : Collections.emptyList();
      throw configuration.translate(queryString, bindings, e);
    } finally {
      if (stmt != null) {
        close(stmt);
      }
    }
  }

  @Override
  public List getSQL() {
    SQLBindings bindings;
    if (configuration.getUseLiterals() || forSession) {
      bindings = new SQLBindings(toString(), Collections.emptyList());
    } else {
      bindings = new SQLBindings(toString(), Collections.singletonList(parameter));
    }
    return Collections.singletonList(bindings);
  }

  @Override
  public String toString() {
    if (queryString == null) {
      var builder = new StringBuilder();
      for (Map.Entry entry : values.entrySet()) {
        builder.append(entry.getKey()).append("=").append(entry.getValue());
        builder.append(";");
      }
      if (configuration.getUseLiterals() || forSession) {
        queryString =
            "set query_band='"
                + configuration.getTemplates().escapeLiteral(builder.toString())
                + (forSession ? "' for session" : "' for transaction");
        parameter = null;
      } else {
        queryString = "set query_band=? for transaction";
        parameter = builder.toString();
      }
    }
    return queryString;
  }

  @Override
  public int getBatchCount() {
    return 0;
  }
}