/*
    * 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 org.apache.shardingsphere.infra.session.query;
  
  import lombok.AccessLevel;
  import lombok.Getter;
  import org.apache.shardingsphere.infra.binder.context.statement.SQLStatementContext;
  import org.apache.shardingsphere.infra.binder.context.type.TableAvailable;
  import org.apache.shardingsphere.infra.hint.HintValueContext;
  
  import java.util.List;
  import java.util.Optional;
  
  /**
   * Query context.
   */
  @Getter
  public final class QueryContext {
      
      private final SQLStatementContext sqlStatementContext;
      
      private final String sql;
      
      private final List<Object> parameters;
      
      @Getter(AccessLevel.NONE)
      private final String databaseName;
      
      @Getter(AccessLevel.NONE)
      private final String schemaName;
      
      private final HintValueContext hintValueContext;
      
      private final boolean useCache;
      
      public QueryContext(final SQLStatementContext sqlStatementContext, final String sql, final List<Object> params, final HintValueContext hintValueContext) {
          this(sqlStatementContext, sql, params, hintValueContext, false);
      }
      
      public QueryContext(final SQLStatementContext sqlStatementContext, final String sql, final List<Object> params, final HintValueContext hintValueContext, final boolean useCache) {
          this.sqlStatementContext = sqlStatementContext;
          this.sql = sql;
          parameters = params;
          databaseName = sqlStatementContext instanceof TableAvailable ? ((TableAvailable) sqlStatementContext).getTablesContext().getDatabaseName().orElse(null) : null;
          schemaName = sqlStatementContext instanceof TableAvailable ? ((TableAvailable) sqlStatementContext).getTablesContext().getSchemaName().orElse(null) : null;
          this.hintValueContext = hintValueContext;
          this.useCache = useCache;
      }
      
      /**
       * Get database name from SQL statement.
       * 
       * @return got database name
       */
      public Optional<String> getDatabaseNameFromSQLStatement() {
          return Optional.ofNullable(databaseName);
      }
      
      /**
       * Get schema name from SQL statement.
       *
       * @return got schema name
       */
      public Optional<String> getSchemaNameFromSQLStatement() {
          return Optional.ofNullable(schemaName);
      }
  }