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    8ÄT_O!  ã                   @   s°   d dl mZmZ d dlmZ d dlmZmZ d dlm	Z	m
Z
 d dlmZ d dlmZ d dlmZ d dlmZ d d	lmZmZmZ d d
lmZ d dlmZmZ G dd„ deƒZdS )é    )ÚbyrefÚc_double)ÚGDALBase)ÚEnvelopeÚOGREnvelope)ÚGDALExceptionÚSRSException)ÚFeature)ÚOGRFieldTypes)ÚOGRGeometry)ÚOGRGeomType)ÚdsÚgeomÚsrs)ÚSpatialReference)Úforce_bytesÚ	force_strc                   @   sî   e Zd ZdZdd„ Zdd„ Zdd„ Zdd	„ Zd
d„ Zdd„ Z	e
dd„ ƒZe
dd„ ƒZe
d/dd„ƒZe
dd„ ƒZe
dd„ ƒZe
dd„ ƒZe
dd„ ƒZe
dd„ ƒZe
dd „ ƒZe
d!d"„ ƒZd#d$„ Zd%d&„ Ze
eeƒZd'd(„ Zd0d*d+„Zd,d-„ Zd.S )1ÚLayerzSA class that wraps an OGR Layer, needs to be instantiated from a DataSource object.c                 C   s6   |st dƒ‚|| _|| _t | j¡| _|  d¡| _dS )a7  
        Initialize on an OGR C pointer to the Layer and the `DataSource` object
        that owns this layer.  The `DataSource` object is required so that a
        reference to it is kept with this Layer.  This prevents garbage
        collection of the `DataSource` while this Layer is still active.
        z*Cannot create Layer, invalid pointer givens
   RandomReadN)	r   ÚptrÚ_dsÚcapiZget_layer_defnÚ_ptrÚ_ldefnÚtest_capabilityÚ_random_read)ÚselfZ	layer_ptrr   © r   úA/tmp/pip-unpacked-wheel-dv63caxw/django/contrib/gis/gdal/layer.pyÚ__init__   s    zLayer.__init__c                    sf   t |tƒr$|dk rtdƒ‚ˆ  |¡S t |tƒrZ| ˆ j¡\}}}‡ fdd„t|||ƒD ƒS tdƒ‚dS )z'Get the Feature at the specified index.r   z/Negative indices are not allowed on OGR Layers.c                    s   g | ]}ˆ   |¡‘qS r   )Ú_make_feature)Ú.0Úfid©r   r   r   Ú
<listcomp>3   s     z%Layer.__getitem__.<locals>.<listcomp>z>Integers and slices may only be used when indexing OGR Layers.N)	Ú
isinstanceÚintÚ
IndexErrorr   ÚsliceÚindicesÚnum_featÚrangeÚ	TypeError)r   ÚindexÚstartÚstopZstrider   r"   r   Ú__getitem__'   s    


zLayer.__getitem__c                 c   s4   t  | j¡ t| jƒD ]}tt  | j¡| ƒV  qdS )z'Iterate over each Feature in the Layer.N)r   Zreset_readingr   r*   r)   r	   Zget_next_feature)r   Úir   r   r   Ú__iter__7   s    zLayer.__iter__c                 C   s   | j S )z%The length is the number of features.)r)   r"   r   r   r   Ú__len__>   s    zLayer.__len__c                 C   s   | j S )zThe string name of the layer.)Únamer"   r   r   r   Ú__str__B   s    zLayer.__str__c                 C   s`   | j r4ztt | j|¡| ƒW S  tk
r0   Y qPX n| D ]}|j|kr8|  S q8td| ƒ‚dS )a.  
        Helper routine for __getitem__ that constructs a Feature from the given
        Feature ID.  If the OGR Layer does not support random-access reading,
        then each feature of the layer will be incremented through until the
        a Feature is found matching the given feature ID.
        zInvalid feature id: %s.N)r   r	   r   Zget_featurer   r   r!   r&   )r   Zfeat_idÚfeatr   r   r   r   F   s    

zLayer._make_featurec                 C   s"   t ƒ }t | jt|ƒd¡ t|ƒS )z.Return the extent (an Envelope) of this layer.é   )r   r   Z
get_extentr   r   r   )r   Úenvr   r   r   Úextent]   s    zLayer.extentc                 C   s   t  | j¡}t|| jjdd�S )z1Return the name of this layer in the Data Source.T©Zstrings_only)r   Zget_fd_namer   r   r   Úencoding)r   r3   r   r   r   r3   d   s    z
Layer.namer6   c                 C   s   t  | j|¡S )z+Return the number of features in the Layer.)r   Zget_feature_countr   )r   Úforcer   r   r   r)   j   s    zLayer.num_featc                 C   s   t  | j¡S )z)Return the number of fields in the Layer.)r   Zget_field_countr   r"   r   r   r   Ú
num_fieldso   s    zLayer.num_fieldsc                 C   s   t t | j¡ƒS )z4Return the geometry type (OGRGeomType) of the Layer.)r   r   Zget_fd_geom_typer   r"   r   r   r   Ú	geom_typet   s    zLayer.geom_typec                 C   s8   zt  | j¡}tt |¡ƒW S  tk
r2   Y dS X dS )z0Return the Spatial Reference used in this Layer.N)r   Zget_layer_srsr   r   Úsrs_apiZ	clone_srsr   )r   r   r   r   r   r   y   s
    z	Layer.srsc                    s   ‡ fdd„t ˆ jƒD ƒS )zt
        Return a list of string names corresponding to each of the Fields
        available in this Layer.
        c              	      s.   g | ]&}t t t ˆ j|¡¡ˆ jjd d�‘qS )Tr9   )r   r   Zget_field_nameÚget_field_defnr   r   r:   ©r    r0   r"   r   r   r#   ˆ   s   ý þz Layer.fields.<locals>.<listcomp>©r*   r<   r"   r   r"   r   Úfields‚   s    
ýzLayer.fieldsc                    s   ‡ fdd„t ˆ jƒD ƒS )zß
        Return a list of the types of fields in this Layer.  For example,
        return the list [OFTInteger, OFTReal, OFTString] for an OGR layer that
        has an integer, a floating-point, and string fields.
        c              	      s$   g | ]}t t t ˆ j|¡¡ ‘qS r   )r
   r   Zget_field_typer?   r   r@   r"   r   r   r#   ”   s   ÿz%Layer.field_types.<locals>.<listcomp>rA   r"   r   r"   r   Úfield_types�   s    
ÿzLayer.field_typesc                    s   ‡ fdd„t ˆ jƒD ƒS )z;Return a list of the maximum field widths for the features.c                    s    g | ]}t  t  ˆ j|¡¡‘qS r   )r   Zget_field_widthr?   r   r@   r"   r   r   r#   š   s   ÿz&Layer.field_widths.<locals>.<listcomp>rA   r"   r   r"   r   Úfield_widths—   s    
ÿzLayer.field_widthsc                    s   ‡ fdd„t ˆ jƒD ƒS )z-Return the field precisions for the features.c                    s    g | ]}t  t  ˆ j|¡¡‘qS r   )r   Zget_field_precisionr?   r   r@   r"   r   r   r#       s   ÿz*Layer.field_precisions.<locals>.<listcomp>rA   r"   r   r"   r   Úfield_precisions�   s    
ÿzLayer.field_precisionsc                 C   s4   zt t t | j¡¡ƒW S  tk
r.   Y d S X d S )N)r   Úgeom_apiZ
clone_geomr   Zget_spatial_filterr   r   r"   r   r   r   Ú_get_spatial_filter£   s    zLayer._get_spatial_filterc                 C   sŠ   t |tƒrt | j|j¡ njt |ttfƒrft|ƒdks>tdƒ‚t	t
|ƒ\}}}}t | j||||¡ n |d kr~t | jd ¡ ntdƒ‚d S )Né   z/Spatial filter list/tuple must have 4 elements.zJSpatial filter must be either an OGRGeometry instance, a 4-tuple, or None.)r$   r   r   Zset_spatial_filterr   ÚtupleÚlistÚlenÚ
ValueErrorÚmapr   Zset_spatial_filter_rectr+   )r   ÚfilterZxminZyminZxmaxZymaxr   r   r   Ú_set_spatial_filter©   s    
zLayer._set_spatial_filterc                    s(   ˆ | j krtdˆ  ƒ‚‡ fdd„| D ƒS )zg
        Return a list containing the given field name for every Feature
        in the Layer.
        zinvalid field name: %sc                    s   g | ]}|  ˆ ¡‘qS r   )Úget©r    r5   ©Ú
field_namer   r   r#   Â   s     z$Layer.get_fields.<locals>.<listcomp>)rB   r   )r   rS   r   rR   r   Ú
get_fields»   s    
zLayer.get_fieldsFc                    s4   |r"ddl m‰  ‡ fdd„| D ƒS dd„ | D ƒS dS )zb
        Return a list containing the OGRGeometry for every Feature in
        the Layer.
        r   ©ÚGEOSGeometryc                    s   g | ]}ˆ |j jƒ‘qS r   )r   ZwkbrQ   rU   r   r   r#   Ë   s     z#Layer.get_geoms.<locals>.<listcomp>c                 S   s   g | ]
}|j ‘qS r   )r   rQ   r   r   r   r#   Í   s     N)Zdjango.contrib.gis.geosrV   )r   Zgeosr   rU   r   Ú	get_geomsÄ   s    zLayer.get_geomsc                 C   s   t t | jt|ƒ¡ƒS )ah  
        Return a bool indicating whether the this Layer supports the given
        capability (a string).  Valid capability strings include:
          'RandomRead', 'SequentialWrite', 'RandomWrite', 'FastSpatialFilter',
          'FastFeatureCount', 'FastGetExtent', 'CreateField', 'Transactions',
          'DeleteFeature', and 'FastSetNextByIndex'.
        )Úboolr   r   r   r   )r   Z
capabilityr   r   r   r   Ï   s    zLayer.test_capabilityN)r6   )F)Ú__name__Ú
__module__Ú__qualname__Ú__doc__r   r/   r1   r2   r4   r   Úpropertyr8   r3   r)   r<   r=   r   rB   rC   rD   rE   rG   rO   Zspatial_filterrT   rW   r   r   r   r   r   r      sB   







	


	
r   N) Úctypesr   r   Zdjango.contrib.gis.gdal.baser   Z django.contrib.gis.gdal.enveloper   r   Zdjango.contrib.gis.gdal.errorr   r   Zdjango.contrib.gis.gdal.featurer	   Zdjango.contrib.gis.gdal.fieldr
   Z"django.contrib.gis.gdal.geometriesr   Z django.contrib.gis.gdal.geomtyper   Z"django.contrib.gis.gdal.prototypesr   r   r   rF   r   r>   Zdjango.contrib.gis.gdal.srsr   Zdjango.utils.encodingr   r   r   r   r   r   r   Ú<module>   s   