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gost_filtering.md

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GOST filtering

Samples of supported filtering requests

Logical Operators

  • Equals
$ curl http://localhost:8080/v1.0/Datastreams?$filter=name eq 'test1'
  • Not Equals
$ curl http://localhost:8080/v1.0/Datastreams?$filter=name ne 'test1'
  • Lower than
$ curl http://localhost:8080/v1.0/Observations?$filter=result lt 5
  • Lower or equals than
$ http://localhost:8080/v1.0/Observations?$filter=result le 5
  • Greater than
$ curl http://localhost:8080/v1.0/Observations?$filter=result gt 5
  • Greater or equals than
$ curl http://localhost:8080/v1.0/Observations?$filter=result ge 5
  • And
$ curl http://localhost:8080/v1.0/Observations?$filter=result ge 5 and result le 15
  • Or
$ curl http://localhost:8080/v1.0/Observations?$filter=result lt 5 or result gt 15
  • Not
$ curl http://localhost:8080/v1.0/Datastream?$filter=not endswith(Description,'milk')

Arithmetic Operators

  • Add

select observations where result equals 10 + 5 = 15

$ curl http://localhost:8080/v1.0/Observations?$filter=result eq 10 add 5
  • Sub

select observations where result equals 10 - 3 = 7

$ curl http://localhost:8080/v1.0/Observations?$filter=result eq 10 sub 3
  • Mul

select observations where result equals 10 * 3 = 30

$ curl http://localhost:8080/v1.0/Observations?$filter=result eq 10 mul 3
  • Div

select observations where result equals 21 / 3 = 7

$ curl http://localhost:8080/v1.0/Observations?$filter=result eq 21 div 3
  • Mod

select observations where result modulo 2 == 0

$ curl http://localhost:8080/v1.0/Observations?$filter=result mod 2 eq 0

grouping Operators

$ curl http://localhost:8080/v1.0/Observations?$filter=(result sub 5) eq 45

String functions

  • contains
$ curl http://localhost:8080/v1.0/Sensors?$filter=contains(name,'temperature')
  • startswith
$ curl http://localhost:8080/v1.0/Sensors?$filter=startswith(name,'temp')
  • endswith
$ curl http://localhost:8080/v1.0/Sensors?$filter=endswith(name,'sensor')
  • length
$ curl http://localhost:8080/v1.0/Sensors?$filter=length(name) eq 18
  • indexof
$ curl http://localhost:8080/v1.0/Sensors?$filter=indexof(name, 'sensor') eq 0
  • substringof
$ curl http://localhost:8080/v1.0/Sensors?$filter=substringof('sensor', name) eq true
  • trim
$ curl http://localhost:8080/v1.0/Sensors?$filter=trim(name) eq 'My Sensor'
  • toupper
$ curl http://localhost:8080/v1.0/Sensors?$filter=toupper(name) eq 'SENSOR NAME 1'
  • tolower
$ curl http://localhost:8080/v1.0/Sensors?$filter=tolower(name) eq 'sensor name 1'
  • concat
$ curl http://localhost:8080/v1.0/Sensors?$filter=concat(name,'!') eq 'sensor name 1!'

Geospatial functions

  • geo.distance
$ curl http://localhost:8080/v1.0/Locations?$filter=geo.distance(location, geography'POINT(-122 43)') gt 1
  • geo.length
$ curl http://localhost:8080/v1.0/Locations?$filter=geo.length(location) gt 0
  • geo.intersects
$ curl http://localhost:8080/v1.0/Locations?$filter=geo.intersects(location, geography'POLYGON ((30 10, 10 20, 20 40, 40 40, 30 10))')

Spatial Relationship Functions

  • st_within
$ curl http://localhost:8080/v1.0/Locations?$filter=st_within(location,geography'POLYGON((-180 -90, -180 90, 180 90, 180 -90, -180 -90))')
  • st_intersects
$ curl http://localhost:8080/v1.0/Locations?$filter=st_intersects(location, geography'POLYGON ((-180 -90, -180 90, 180 90, 180 -90, -180 -90))')
  • st_equals
$ curl http://localhost:8080/v1.0/Locations?$filter=st_equals(location, geography'POINT (-117.123 54.123)')
  • st_disjoint
$ curl http://localhost:8080/v1.0/Locations?$filter=st_disjoint(location, geography'POLYGON ((-180 -90, -180 90, 180 90, 180 -90, -180 -90))')
  • st_touches
$ curl http://localhost:8080/v1.0/Locations?$filter=st_touches(location, geography'POLYGON ((-180 -90, -180 90, 180 90, 180 -90, -180 -90))')
  • st_overlaps
$ curl http://localhost:8080/v1.0/Locations?$filter=st_overlaps(location, geography'POLYGON ((-180 -90, -180 90, 180 90, 180 -90, -180 -90))')
  • st_crosses
$ curl http://localhost:8080/v1.0/Locations?$filter=st_crosses(location, geography'POLYGON ((-180 -90, -180 90, 180 90, 180 -90, -180 -90))')
  • st_contains
$ curl http://localhost:8080/v1.0/Locations?$filter=st_contains(location, geography'POLYGON ((-180 -90, -180 90, 180 90, 180 -90, -180 -90))')
  • st_relate

Relates two geometry, more info about the format see https://en.wikipedia.org/wiki/DE-9IM

$ curl http://localhost:8080/v1.0/Locations?$filter=st_relate(location, geography'POLYGON ((30 10, 10 20, 20 40, 40 40, 30 10))', 'T********')

Date functions

  • day
$ curl http://localhost:8080/v1.0/Observations?$filter=day(phenomenonTime) eq 4
  • hour
$ curl http://localhost:8080/v1.0/Observations?$filter=hour(phenomenonTime) eq 8
  • minute
$ curl http://localhost:8080/v1.0/Observations?$filter=minute(phenomenonTime) eq 8
  • second
$ curl http://localhost:8080/v1.0/Observations?$filter=second(phenomenonTime) eq 8.234
  • month
$ curl http://localhost:8080/v1.0/Observations?$filter=month(phenomenonTime) eq 8
  • month
$ curl http://localhost:8080/v1.0/Observations?$filter=year(phenomenonTime) eq 2017
  • fractional seconds
$ curl http://localhost:8080/v1.0/Observations?$filter=fractionalseconds(phenomenonTime) eq 733
  • now
$ curl http://localhost:8080/v1.0/Observations?$filter=phenomenonTime gt now()
  • mindatetime
$ curl http://localhost:8080/v1.0/Observations?$filter=phenomenonTime gt mindatetime()
  • maxdatetime
$ curl http://localhost:8080/v1.0/Observations?$filter=phenomenonTime lt maxdatetime()
  • totaloffsetminutes
$ curl http://localhost:8080/v1.0/Observations?$filter=totaloffsetminutes(phenomenonTime) eq 0
  • date
$ curl http://localhost:8080/v1.0/Observations?$filter=date(phenomenonTime) eq date('2017-07-04')
  • time
$ curl http://localhost:8080/v1.0/Observations?$filter=time(phenomenonTime) eq time('14:31:24.733Z')

Math functions

  • round
$ curl http://localhost:8080/v1.0/Observations?$filter=round(result) eq 10
  • floor
$ curl http://localhost:8080/v1.0/Observations?$filter=floor(result) eq 10
  • floor
$ curl http://localhost:8080/v1.0/Observations?$filter=ceiling(result) eq 10

Filter on related entities

$ curl http://localhost:8080/v1.0/Observations?$filter=Datastream/id eq ‘1’

Status: not implemented

Type functions

isOf

status: not implemented