/*
    * 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.data.pipeline.core.sqlbuilder.segment;
  
  import com.google.common.base.Strings;
  import org.apache.shardingsphere.infra.database.core.metadata.database.DialectDatabaseMetaData;
  import org.apache.shardingsphere.infra.database.core.type.DatabaseType;
  import org.apache.shardingsphere.infra.database.core.type.DatabaseTypeRegistry;
  
  /**
   * Pipeline SQL segment builder.
   */
  public final class PipelineSQLSegmentBuilder {
      
      private final DialectDatabaseMetaData dialectDatabaseMetaData;
      
      public PipelineSQLSegmentBuilder(final DatabaseType databaseType) {
          dialectDatabaseMetaData = new DatabaseTypeRegistry(databaseType).getDialectDatabaseMetaData();
      }
      
      /**
       * Get escaped identifier.
       *
       * @param identifier identifier to be processed
       * @return escaped identifier
       */
      public String getEscapedIdentifier(final String identifier) {
          return dialectDatabaseMetaData.isReservedWord(identifier) ? dialectDatabaseMetaData.getQuoteCharacter().wrap(identifier) : identifier;
      }
      
      /**
       * Get qualified table name.
       *
       * @param schemaName schema name
       * @param tableName table name
       * @return qualified table name
       */
      public String getQualifiedTableName(final String schemaName, final String tableName) {
          StringBuilder result = new StringBuilder();
          if (dialectDatabaseMetaData.isSchemaAvailable() && !Strings.isNullOrEmpty(schemaName)) {
              result.append(getEscapedIdentifier(schemaName)).append('.');
          }
          result.append(getEscapedIdentifier(tableName));
          return result.toString();
      }
  }