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package com.scalar.db.sql.statement;

import java.util.Objects;
import javax.annotation.Nullable;

public class ShowGrantsStatement implements CommandStatement {

  @Nullable public final String username;

  private ShowGrantsStatement(@Nullable String username) {
    this.username = username;
  }

  @Override
  public String toSql() {
    return "SHOW GRANTS" + (username == null ? "" : " FOR " + username);
  }

  @Override
  public  R accept(CommandStatementVisitor visitor, C context) {
    return visitor.visit(this, context);
  }

  @Override
  public  R accept(StatementVisitor visitor, C context) {
    return visitor.visit(this, context);
  }

  @Override
  public String toString() {
    return toSql();
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (!(o instanceof ShowGrantsStatement)) {
      return false;
    }
    ShowGrantsStatement that = (ShowGrantsStatement) o;
    return Objects.equals(username, that.username);
  }

  @Override
  public int hashCode() {
    return Objects.hashCode(username);
  }

  public static ShowGrantsStatement create(@Nullable String username) {
    return new ShowGrantsStatement(username);
  }
}