U
    HaP!                     @   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ZdS )    )byrefc_double)GDALBase)EnvelopeOGREnvelope)GDALExceptionSRSException)Feature)OGRFieldTypes)OGRGeometry)OGRGeomType)dsgeomsrs)SpatialReference)force_bytes	force_strc                   @   s   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 Ze
dd Ze
d/ddZe
dd Ze
dd Ze
dd Ze
dd Ze
dd Ze
dd  Ze
d!d" Zd#d$ Zd%d& Ze
eeZd'd( Zd0d*d+Zd,d- Zd.S )1LayerzSA class that wraps an OGR Layer, needs to be instantiated from a DataSource object.c                 C   s6   |st d|| _|| _t| j| _| d| _dS )a7  
        Initialize on an OGR C pointer to the Layer and the `DataSource` object
        that owns this layer.  The `DataSource` object is required so that a
        reference to it is kept with this Layer.  This prevents garbage
        collection of the `DataSource` while this Layer is still active.
        z*Cannot create Layer, invalid pointer givens
   RandomReadN)	r   ptr_dscapiZget_layer_defn_ptr_ldefntest_capability_random_read)selfZ	layer_ptrr    r   A/tmp/pip-unpacked-wheel-3jxiddxt/django/contrib/gis/gdal/layer.py__init__   s    zLayer.__init__c                    sf   t |tr$|dk rtd |S t |trZ| j\}}} fddt|||D S tddS )z'Get the Feature at the specified index.r   z/Negative indices are not allowed on OGR Layers.c                    s   g | ]}  |qS r   )_make_feature).0fidr   r   r   
<listcomp>3   s     z%Layer.__getitem__.<locals>.<listcomp>z>Integers and slices may only be used when indexing OGR Layers.N)	
isinstanceint
IndexErrorr   sliceindicesnum_featrange	TypeError)r   indexstartstopZstrider   r"   r   __getitem__'   s    


zLayer.__getitem__c                 c   s4   t | j t| jD ]}tt | j| 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   ir   r   r   __iter__7   s    zLayer.__iter__c                 C   s   | j S )z%The length is the number of features.)r)   r"   r   r   r   __len__>   s    zLayer.__len__c                 C   s   | j S )zThe string name of the layer.)namer"   r   r   r   __str__B   s    zLayer.__str__c                 C   s`   | j r4ztt| j|| W S  tk
r0   Y qPX n| D ]}|j|kr8|  S q8td| 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_idfeatr   r   r   r   F   s    

zLayer._make_featurec                 C   s"   t  }t| jt|d t|S )z.Return the extent (an Envelope) of this layer.   )r   r   Z
get_extentr   r   r   )r   envr   r   r   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   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   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   
num_fieldso   s    zLayer.num_fieldsc                 C   s   t t| jS )z4Return the geometry type (OGRGeomType) of the Layer.)r   r   Zget_fd_geom_typer   r"   r   r   r   	geom_typet   s    zLayer.geom_typec                 C   s8   zt | j}tt|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   srs_apiZ	clone_srsr   )r   r   r   r   r   r   y   s
    z	Layer.srsc                    s    fddt  jD S )zt
        Return a list of string names corresponding to each of the Fields
        available in this Layer.
        c              	      s.   g | ]&}t tt j| jjd dqS )Tr9   )r   r   Zget_field_nameget_field_defnr   r   r:   r    r0   r"   r   r   r#      s    z Layer.fields.<locals>.<listcomp>r*   r<   r"   r   r"   r   fields   s    
zLayer.fieldsc                    s    fddt  jD S )z
        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$   g | ]}t tt j| qS r   )r
   r   Zget_field_typer?   r   r@   r"   r   r   r#      s   z%Layer.field_types.<locals>.<listcomp>rA   r"   r   r"   r   field_types   s    
zLayer.field_typesc                    s    fddt  jD S )z;Return a list of the maximum field widths for the features.c                    s    g | ]}t t  j|qS r   )r   Zget_field_widthr?   r   r@   r"   r   r   r#      s   z&Layer.field_widths.<locals>.<listcomp>rA   r"   r   r"   r   field_widths   s    
zLayer.field_widthsc                    s    fddt  jD S )z-Return the field precisions for the features.c                    s    g | ]}t t  j|qS r   )r   Zget_field_precisionr?   r   r@   r"   r   r   r#      s   z*Layer.field_precisions.<locals>.<listcomp>rA   r"   r   r"   r   field_precisions   s    
zLayer.field_precisionsc                 C   s4   zt tt| jW S  tk
r.   Y d S X d S )N)r   geom_apiZ
clone_geomr   Zget_spatial_filterr   r   r"   r   r   r   _get_spatial_filter   s    zLayer._get_spatial_filterc                 C   s   t |trt| j|j njt |ttfrft|dks>tdt	t
|\}}}}t| j|||| n |d kr~t| jd  ntdd S )N   z/Spatial filter list/tuple must have 4 elements.zJSpatial filter must be either an OGRGeometry instance, a 4-tuple, or None.)r$   r   r   Zset_spatial_filterr   tuplelistlen
ValueErrormapr   Zset_spatial_filter_rectr+   )r   filterZxminZyminZxmaxZymaxr   r   r   _set_spatial_filter   s    
zLayer._set_spatial_filterc                    s(    | j krtd   fdd| D S )zg
        Return a list containing the given field name for every Feature
        in the Layer.
        zinvalid field name: %sc                    s   g | ]}|  qS r   )getr    r5   
field_namer   r   r#      s     z$Layer.get_fields.<locals>.<listcomp>)rB   r   )r   rS   r   rR   r   
get_fields   s    
zLayer.get_fieldsFc                    s4   |r"ddl m   fdd| D S dd | D S dS )zb
        Return a list containing the OGRGeometry for every Feature in
        the Layer.
        r   GEOSGeometryc                    s   g | ]} |j jqS r   )r   ZwkbrQ   rU   r   r   r#      s     z#Layer.get_geoms.<locals>.<listcomp>c                 S   s   g | ]
}|j qS r   )r   rQ   r   r   r   r#      s     N)Zdjango.contrib.gis.geosrV   )r   Zgeosr   rU   r   	get_geoms   s    zLayer.get_geomsc                 C   s   t t| jt|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'.
        )boolr   r   r   r   )r   Z
capabilityr   r   r   r      s    zLayer.test_capabilityN)r6   )F)__name__
__module____qualname____doc__r   r/   r1   r2   r4   r   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) 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   <module>   s   