Class Accumulators

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static <TExpression>
      BsonField
      addToSet​(String fieldName, TExpression expression)
      Gets a field name for a $group operation representing all unique values that results from applying the given expression to each document in a group of documents that share the same group by key.
      static <TExpression>
      BsonField
      avg​(String fieldName, TExpression expression)
      Gets a field name for a $group operation representing the average of the values of the given expression when applied to all members of the group.
      static <TExpression>
      BsonField
      first​(String fieldName, TExpression expression)
      Gets a field name for a $group operation representing the value of the given expression when applied to the first member of the group.
      static <TExpression>
      BsonField
      last​(String fieldName, TExpression expression)
      Gets a field name for a $group operation representing the value of the given expression when applied to the last member of the group.
      static <TExpression>
      BsonField
      max​(String fieldName, TExpression expression)
      Gets a field name for a $group operation representing the maximum of the values of the given expression when applied to all members of the group.
      static <TExpression>
      BsonField
      min​(String fieldName, TExpression expression)
      Gets a field name for a $group operation representing the minimum of the values of the given expression when applied to all members of the group.
      static <TExpression>
      BsonField
      push​(String fieldName, TExpression expression)
      Gets a field name for a $group operation representing an array of all values that results from applying an expression to each document in a group of documents that share the same group by key.
      static <TExpression>
      BsonField
      stdDevPop​(String fieldName, TExpression expression)
      Gets a field name for a $group operation representing the sample standard deviation of the values of the given expression when applied to all members of the group.
      static <TExpression>
      BsonField
      stdDevSamp​(String fieldName, TExpression expression)
      Gets a field name for a $group operation representing the sample standard deviation of the values of the given expression when applied to all members of the group.
      static <TExpression>
      BsonField
      sum​(String fieldName, TExpression expression)
      Gets a field name for a $group operation representing the sum of the values of the given expression when applied to all members of the group.
    • Method Detail

      • sum

        public static <TExpression> BsonField sum​(String fieldName,
                                                  TExpression expression)
        Gets a field name for a $group operation representing the sum of the values of the given expression when applied to all members of the group.
        Type Parameters:
        TExpression - the expression type
        Parameters:
        fieldName - the field name
        expression - the expression
        Returns:
        the field
        MongoDB documentation
        $sum
      • avg

        public static <TExpression> BsonField avg​(String fieldName,
                                                  TExpression expression)
        Gets a field name for a $group operation representing the average of the values of the given expression when applied to all members of the group.
        Type Parameters:
        TExpression - the expression type
        Parameters:
        fieldName - the field name
        expression - the expression
        Returns:
        the field
        MongoDB documentation
        $avg
      • first

        public static <TExpression> BsonField first​(String fieldName,
                                                    TExpression expression)
        Gets a field name for a $group operation representing the value of the given expression when applied to the first member of the group.
        Type Parameters:
        TExpression - the expression type
        Parameters:
        fieldName - the field name
        expression - the expression
        Returns:
        the field
        MongoDB documentation
        $first
      • last

        public static <TExpression> BsonField last​(String fieldName,
                                                   TExpression expression)
        Gets a field name for a $group operation representing the value of the given expression when applied to the last member of the group.
        Type Parameters:
        TExpression - the expression type
        Parameters:
        fieldName - the field name
        expression - the expression
        Returns:
        the field
        MongoDB documentation
        $last
      • max

        public static <TExpression> BsonField max​(String fieldName,
                                                  TExpression expression)
        Gets a field name for a $group operation representing the maximum of the values of the given expression when applied to all members of the group.
        Type Parameters:
        TExpression - the expression type
        Parameters:
        fieldName - the field name
        expression - the expression
        Returns:
        the field
        MongoDB documentation
        $max
      • min

        public static <TExpression> BsonField min​(String fieldName,
                                                  TExpression expression)
        Gets a field name for a $group operation representing the minimum of the values of the given expression when applied to all members of the group.
        Type Parameters:
        TExpression - the expression type
        Parameters:
        fieldName - the field name
        expression - the expression
        Returns:
        the field
        MongoDB documentation
        $min
      • push

        public static <TExpression> BsonField push​(String fieldName,
                                                   TExpression expression)
        Gets a field name for a $group operation representing an array of all values that results from applying an expression to each document in a group of documents that share the same group by key.
        Type Parameters:
        TExpression - the expression type
        Parameters:
        fieldName - the field name
        expression - the expression
        Returns:
        the field
        MongoDB documentation
        $push
      • addToSet

        public static <TExpression> BsonField addToSet​(String fieldName,
                                                       TExpression expression)
        Gets a field name for a $group operation representing all unique values that results from applying the given expression to each document in a group of documents that share the same group by key.
        Type Parameters:
        TExpression - the expression type
        Parameters:
        fieldName - the field name
        expression - the expression
        Returns:
        the field
        MongoDB documentation
        $addToSet
      • stdDevPop

        public static <TExpression> BsonField stdDevPop​(String fieldName,
                                                        TExpression expression)
        Gets a field name for a $group operation representing the sample standard deviation of the values of the given expression when applied to all members of the group.

        Use if the values encompass the entire population of data you want to represent and do not wish to generalize about a larger population.

        Type Parameters:
        TExpression - the expression type
        Parameters:
        fieldName - the field name
        expression - the expression
        Returns:
        the field
        Since:
        3.2
        MongoDB documentation
        $stdDevPop
        Since server release
        3.2
      • stdDevSamp

        public static <TExpression> BsonField stdDevSamp​(String fieldName,
                                                         TExpression expression)
        Gets a field name for a $group operation representing the sample standard deviation of the values of the given expression when applied to all members of the group.

        Use if the values encompass a sample of a population of data from which to generalize about the population.

        Type Parameters:
        TExpression - the expression type
        Parameters:
        fieldName - the field name
        expression - the expression
        Returns:
        the field
        Since:
        3.2
        MongoDB documentation
        $stdDevSamp
        Since server release
        3.2