SqlTruncateTable.java

/*
 * 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.calcite.sql.ddl;

import org.apache.calcite.sql.SqlCall;
import org.apache.calcite.sql.SqlIdentifier;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlLiteral;
import org.apache.calcite.sql.SqlNode;
import org.apache.calcite.sql.SqlOperator;
import org.apache.calcite.sql.SqlSpecialOperator;
import org.apache.calcite.sql.SqlTruncate;
import org.apache.calcite.sql.SqlWriter;
import org.apache.calcite.sql.parser.SqlParserPos;

import com.google.common.collect.ImmutableList;

import org.checkerframework.checker.nullness.qual.Nullable;

import java.util.List;

import static java.util.Objects.requireNonNull;

/**
 * Parse tree for {@code TRUNCATE TABLE} statement.
 */
public class SqlTruncateTable extends SqlTruncate {

  private static final SqlOperator OPERATOR =
      new SqlSpecialOperator("TRUNCATE TABLE", SqlKind.TRUNCATE_TABLE) {
        @Override public SqlCall createCall(@Nullable SqlLiteral functionQualifier,
            SqlParserPos pos, @Nullable SqlNode... operands) {
          return new SqlTruncateTable(pos,
              (SqlIdentifier) requireNonNull(operands[0], "name"),
              ((SqlLiteral) requireNonNull(operands[1], "continueIdentity")).booleanValue());
        }
      };

  public final SqlIdentifier name;
  public final boolean continueIdentity;

  /**
   * Creates a SqlTruncateTable.
   */
  public SqlTruncateTable(SqlParserPos pos, SqlIdentifier name, boolean continueIdentity) {
    super(OPERATOR, pos);
    this.name = name;
    this.continueIdentity = continueIdentity;
  }

  @Override public List<SqlNode> getOperandList() {
    return ImmutableList.of(name, SqlLiteral.createBoolean(continueIdentity, SqlParserPos.ZERO));
  }

  @Override public void unparse(SqlWriter writer, int leftPrec, int rightPrec) {
    writer.keyword("TRUNCATE");
    writer.keyword("TABLE");
    name.unparse(writer, leftPrec, rightPrec);
    if (continueIdentity) {
      writer.keyword("CONTINUE IDENTITY");
    } else {
      writer.keyword("RESTART IDENTITY");
    }
  }
}