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Ran 24 Apr 2017 03:17AM UTC

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Committed 24 Apr 2017 03:16AM UTC coverage: 94.467%. First build

Job # PICOGEOJSON_PYJSON=1

Build Type

push

travis-ci

Committed by

njwilson23

Commit Message

implement GeoJSONResult type

GeoJSONResult makes it easier to read data from unknown sources
defensively. Rather than needing to carefully check the types of the
values returns from `fromstring` or `fromfile`, GeoJSONResult provides
generators to visit all geometries of a particular type in a result.

For example, if a string *s* is expected to contain at
GeometryCollection with multple Points, a bad approach is

    coords = [pt.coordinates for pt in fromstring(s).geometries]

while will fail at runtime if the types were not what we expected.
Previously we would have had to do something like

    geojson = fromstring(s)
    coords = []
    if isinstance(geojson, picogeojson.GeometryCollection):
        for item in geojson.geometries:
            if isinstance(item, picogeojson.Point):
                coords.append(geojson.coordinates)

raising the appropriate errors as needed. Now, we can do instead

    coords = [pt.coordinates for pt in result_fromstring(s)]

which collects all non-feature Points. Currently, GeoJSONResult provides
generators for Point, LineString, and Polygon types. MultiPoint,
MultiLineString, MultiPolygon, and Features will come in the future.

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