view backend/contrib/shpimporter/utils.py @ 9415:9744ce3c3853

Rework of fixanalysis computation and dWt and WQ facets. Got rid of strange remapping and bitshifting code by explicitely saving the column information and using it in the facets. The facets also put the valid station range into their xml-metadata
author gernotbelger
date Thu, 16 Aug 2018 16:27:53 +0200
parents 5aa05a7a34b7
children
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import os
import sys
import logging

try:
    from osgeo import ogr
except ImportError:
    import ogr

logger = logging.getLogger("utils")

SHP='.shp'
SQL_SELECT_RIVER_ID="SELECT id FROM rivers WHERE name = %s"
SQL_SELECT_RIVER_ID_ORA="SELECT id FROM rivers WHERE name = :s"

def findShapefiles(path):
    shapes = []

    for root, dirs, files in os.walk(path):
        if len(files) == 0:
            continue

        logger.debug("Processing directory '%s' with %i files " % (root, len(files)))

        for f in files:
            idx = f.find(SHP)
            if (idx+len(SHP)) == len(f):
                shapes.append((f.replace(SHP, ''), root + "/" + f))

    return shapes

def getRiverId(dbconn, name, oracle):
    """
    Returns the id of the river "name"
    Dbconn must be a python database connection api compliant object
    """
    cur = dbconn.cursor()
    if oracle:
        # This is stupid and shoudl not be neccessary. But I don't
        # know how to make it work both ways. aheinecke - 02/2013
        stmt = SQL_SELECT_RIVER_ID_ORA
    else:
        stmt = SQL_SELECT_RIVER_ID
    cur.execute(stmt, (getUTF8(name),))
    row = cur.fetchone()
    if row:
        return row[0]
    else:
        return 0

def getUTF8(string):
    """
    Tries to convert the string to a UTF-8 encoding by first checking if it
    is UTF-8 and then trying cp1252
    """
    try:
        return unicode.encode(unicode(string, "UTF-8"), "UTF-8")
    except UnicodeDecodeError:
        # Probably European Windows names so lets try again
        return unicode.encode(unicode(string, "cp1252"), "UTF-8")

def getUTF8Path(path):
    """
    Tries to convert path to utf-8 by first checking the filesystemencoding
    and trying the default windows encoding afterwards.
    Returns a valid UTF-8 encoded unicode object or throws a UnicodeDecodeError
    """
    try:
        return unicode.encode(unicode(path, sys.getfilesystemencoding()), "UTF-8")
    except UnicodeDecodeError:
        # Probably European Windows names so lets try again
        return unicode.encode(unicode(path, "cp1252"), "UTF-8")

WKB_MAP = {
    ogr.wkb25Bit :                'wkb25Bit',
    ogr.wkbGeometryCollection :   'wkbGeometryCollection',
    ogr.wkbGeometryCollection25D :'wkbGeometryCollection25D',
    ogr.wkbLineString :           'wkbLineString',
    ogr.wkbLineString25D :        'wkbLineString25D',
    ogr.wkbLinearRing :           'wkbLinearRing',
    ogr.wkbMultiLineString :      'wkbMultiLineString',
    ogr.wkbMultiLineString25D :   'wkbMultiLineString25D',
    ogr.wkbMultiPoint :           'wkbMultiPoint',
    ogr.wkbMultiPoint25D :        'wkbMultiPoint25D',
    ogr.wkbMultiPolygon :         'wkbMultiPolygon',
    ogr.wkbMultiPolygon25D :      'wkbMultiPolygon25D',
    ogr.wkbNDR :                  'wkbNDR',
    ogr.wkbNone :                 'wkbNone',
    ogr.wkbPoint :                'wkbPoint',
    ogr.wkbPoint25D :             'wkbPoint25D',
    ogr.wkbPolygon :              'wkbPolygon',
    ogr.wkbPolygon25D :           'wkbPolygon25D',
    ogr.wkbUnknown :              'wkbUnknown',
    ogr.wkbXDR :                  'wkbXDR'
}

def getWkbString(type):
    return WKB_MAP.get(type) or "Unknown"

def convertToMultiLine(feature):
    """
    Converts a feature to a multiline feature.
    """
    geometry = feature.GetGeometryRef()
    # SRS information is lost while forcing to multiline
    srs = geometry.GetSpatialReference()
    geometry = ogr.ForceToMultiLineString(geometry)
    geometry.AssignSpatialReference(srs)
    feature.SetGeometry(geometry)
    return feature

def convertToMultiPolygon(feature):
    """
    Converts a feature to a multiline feature.
    """
    geometry = feature.GetGeometryRef()
    # SRS information is lost while forcing to multiline
    srs = geometry.GetSpatialReference()
    geometry = ogr.ForceToMultiPolygon(geometry)
    geometry.AssignSpatialReference(srs)
    feature.SetGeometry(geometry)
    return feature

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