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o ���_` � @ sT d Z ddlmZ ddlmZmZ ddlmZ G dd� dej�Z G dd� dej�Z d S ) zR This module holds simple classes to convert geospatial values from the database. � )�Decimal)�Area�Distance)�modelsc sB e Zd ZdZ� fdd�Zdd� Zd dd�Zd d � Zdd� Z� Z S )� AreaFieldzWrapper for Area values.c � t � �� || _d S �N��super�__init__� geo_field��selfr �� __class__� �M/usr/lib/python3/dist-packages/django/contrib/gis/db/models/sql/conversion.pyr � zAreaField.__init__c C s t |t�s td��|S )Nz0AreaField only accepts Area measurement objects.)� isinstancer � ValueError�r �valuer r r �get_prep_value s zAreaField.get_prep_valueFc C s, |d u rd S |j �| j�}|rt||�S |S r )�ops�get_area_att_for_fieldr �getattr)r r � connection�prepared�area_attr r r �get_db_prep_value s zAreaField.get_db_prep_valuec C sF |d u rd S t |t�rt|�}|j�| j�}|r!tdi ||i��S |S �Nr )r r �floatr r r r )r r � expressionr r r r r � from_db_value s zAreaField.from_db_valuec C � dS )Nr r �r r r r �get_internal_type'