module Sequel
  # Represents an error raised in Sequel code.
  class Error < StandardError
    
    # Error raised when an invalid statement is executed.
    class InvalidStatement < Error; end

    # Rollback is a special error used to rollback a transactions.
    # A transaction block will catch this error and wont pass further up the stack.
    class Rollback < Error ; end
    
    # Represents an invalid value stored in the database.
    class InvalidValue < Error ; end
                                       
    # Represents an Invalid transform.
    class InvalidTransform < Error ; end
    
    # Raised on an invalid operation.
    class InvalidOperation < Error; end
                                       
    # Represents an Invalid filter.    
    class InvalidFilter < Error ; end
    
    class InvalidExpression < Error; end
                                       
    # Represents an attempt to performing filter operations when no filter has been specified yet.
    class NoExistingFilter < Error ; end
                                       
    # Represents an invalid join type.
    class InvalidJoinType < Error ; end
                                       
    class WorkerStop < RuntimeError ; end
    
    # Raised when Sequel is unable to load a specified adapter.
    class AdapterNotFound < Error ; end
  end  
end