/*
    * 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.sql.parser.oracle.visitor.statement.type;
  
  import org.apache.shardingsphere.infra.database.core.type.DatabaseType;
  import org.apache.shardingsphere.sql.parser.api.ASTNode;
  import org.apache.shardingsphere.sql.parser.api.visitor.statement.type.TCLStatementVisitor;
  import org.apache.shardingsphere.sql.parser.autogen.OracleStatementParser.CommitContext;
  import org.apache.shardingsphere.sql.parser.autogen.OracleStatementParser.LockContext;
  import org.apache.shardingsphere.sql.parser.autogen.OracleStatementParser.RollbackContext;
  import org.apache.shardingsphere.sql.parser.autogen.OracleStatementParser.SavepointContext;
  import org.apache.shardingsphere.sql.parser.autogen.OracleStatementParser.SetConstraintsContext;
  import org.apache.shardingsphere.sql.parser.autogen.OracleStatementParser.SetTransactionContext;
  import org.apache.shardingsphere.sql.parser.oracle.visitor.statement.OracleStatementVisitor;
  import org.apache.shardingsphere.sql.parser.statement.core.statement.type.lcl.LockStatement;
  import org.apache.shardingsphere.sql.parser.statement.core.statement.type.tcl.CommitStatement;
  import org.apache.shardingsphere.sql.parser.statement.core.statement.type.tcl.RollbackStatement;
  import org.apache.shardingsphere.sql.parser.statement.core.statement.type.tcl.SavepointStatement;
  import org.apache.shardingsphere.sql.parser.statement.core.statement.type.tcl.SetConstraintsStatement;
  import org.apache.shardingsphere.sql.parser.statement.core.statement.type.tcl.SetTransactionStatement;
  import org.apache.shardingsphere.sql.parser.statement.core.value.identifier.IdentifierValue;
  
  import java.util.Collections;
  
  /**
   * TCL statement visitor for Oracle.
   */
  public final class OracleTCLStatementVisitor extends OracleStatementVisitor implements TCLStatementVisitor {
      
      public OracleTCLStatementVisitor(final DatabaseType databaseType) {
          super(databaseType);
      }
      
      @Override
      public ASTNode visitSetTransaction(final SetTransactionContext ctx) {
          return new SetTransactionStatement(getDatabaseType());
      }
      
      @Override
      public ASTNode visitCommit(final CommitContext ctx) {
          return new CommitStatement(getDatabaseType());
      }
      
      @Override
      public ASTNode visitRollback(final RollbackContext ctx) {
          return null == ctx.savepointClause().savepointName() ? new RollbackStatement(getDatabaseType())
                  : new RollbackStatement(getDatabaseType(), ((IdentifierValue) visit(ctx.savepointClause().savepointName())).getValue());
      }
      
      @Override
      public ASTNode visitSavepoint(final SavepointContext ctx) {
          return new SavepointStatement(getDatabaseType(), ((IdentifierValue) visit(ctx.savepointName())).getValue());
      }
      
      @Override
      public ASTNode visitSetConstraints(final SetConstraintsContext ctx) {
          return new SetConstraintsStatement(getDatabaseType());
      }
      
      @Override
      public ASTNode visitLock(final LockContext ctx) {
          return new LockStatement(getDatabaseType(), Collections.emptyList());
      }
  }