ai.nextbillion.kits.geojson

Class Feature

java.lang.Object

ai.nextbillion.kits.geojson.Feature

All Implemented Interfaces:

GeoJson, java.io.Serializable

public final class Feature
extends java.lang.Object
implements GeoJson

This defines a GeoJson Feature object which represents a spatially bound thing. Every Feature object is a GeoJson object no matter where it occurs in a GeoJson text. A Feature object will always have a "TYPE" member with the value "Feature".

A Feature object has a member with the name "geometry". The value of the geometry member SHALL be either a Geometry object or, in the case that the Feature is unlocated, a JSON null value.

A Feature object has a member with the name "properties". The value of the properties member is an object (any JSON object or a JSON null value).

If a Feature has a commonly used identifier, that identifier SHOULD be included as a member of the Feature object through the id() method, and the value of this member is either a JSON string or number.

An example of a serialized feature is given below:

 {
   "TYPE": "Feature",
   "geometry": {
     "TYPE": "Point",
     "coordinates": [102.0, 0.5]
   },
   "properties": {
     "prop0": "value0"
   }
 

See Also:

Serialized Form

Method Summary

Modifier and Type	Method and Description
void	addBooleanProperty(java.lang.String key, java.lang.Boolean value) Convenience method to add a Boolean member.
void	addCharacterProperty(java.lang.String key, java.lang.Character value) Convenience method to add a Character member.
void	addNumberProperty(java.lang.String key, java.lang.Number value) Convenience method to add a Number member.
void	addProperty(java.lang.String key, com.google.gson.JsonElement value) Convenience method to add a JsonElement member.
void	addStringProperty(java.lang.String key, java.lang.String value) Convenience method to add a String member.
BoundingBox	bbox() A Feature Collection might have a member named bbox to include information on the coordinate range for it's Features.
boolean	equals(java.lang.Object obj)
static Feature	fromGeometry(Geometry geometry) Create a new instance of this class by giving the feature a Geometry.
static Feature	fromGeometry(Geometry geometry, BoundingBox bbox) Create a new instance of this class by giving the feature a Geometry.
static Feature	fromGeometry(Geometry geometry, com.google.gson.JsonObject properties) Create a new instance of this class by giving the feature a Geometry and optionally a set of properties.
static Feature	fromGeometry(Geometry geometry, com.google.gson.JsonObject properties, BoundingBox bbox) Create a new instance of this class by giving the feature a Geometry, optionally a set of properties, and optionally pass in a bbox.
static Feature	fromGeometry(Geometry geometry, com.google.gson.JsonObject properties, java.lang.String id) Create a new instance of this class by giving the feature a Geometry, optionally a set of properties, and a String which represents the objects id.
static Feature	fromGeometry(Geometry geometry, com.google.gson.JsonObject properties, java.lang.String id, BoundingBox bbox) Create a new instance of this class by giving the feature a Geometry, optionally a set of properties, and a String which represents the objects id.
static Feature	fromJson(java.lang.String json) Create a new instance of this class by passing in a formatted valid JSON String.
Geometry	geometry() The geometry which makes up this feature.
java.lang.Boolean	getBooleanProperty(java.lang.String key) Convenience method to get a Boolean member.
java.lang.Character	getCharacterProperty(java.lang.String key) Convenience method to get a Character member.
java.lang.Number	getNumberProperty(java.lang.String key) Convenience method to get a Number member.
com.google.gson.JsonElement	getProperty(java.lang.String key) Convenience method to get a JsonElement member.
java.lang.String	getStringProperty(java.lang.String key) Convenience method to get a String member.
int	hashCode()
boolean	hasNonNullValueForProperty(java.lang.String key) Convenience method to check for a member by name as well as non-null value.
boolean	hasProperty(java.lang.String key) Convenience method to check if a member with the specified name is present in this object.
java.lang.String	id() A feature may have a commonly used identifier which is either a unique String or number.
com.google.gson.JsonObject	properties() This contains the JSON object which holds the feature properties.
com.google.gson.JsonElement	removeProperty(java.lang.String key) Removes the property from the object properties.
java.lang.String	toJson() This takes the currently defined values found inside this instance and converts it to a GeoJson string.
java.lang.String	toString()
java.lang.String	type() This describes the TYPE of GeoJson geometry this object is, thus this will always return Feature.
static com.google.gson.TypeAdapter<Feature>	typeAdapter(com.google.gson.Gson gson) Gson TYPE adapter for parsing Gson to this class.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

fromJson

public static Feature fromJson(@NonNull
                               java.lang.String json)

Create a new instance of this class by passing in a formatted valid JSON String. If you are creating a Feature object from scratch it is better to use one of the other provided static factory methods such as fromGeometry(Geometry).

Parameters:

json - a formatted valid JSON string defining a GeoJson Feature

Returns:

a new instance of this class defined by the values passed inside this static factory method

fromGeometry

public static Feature fromGeometry(@Nullable
                                   Geometry geometry)

Create a new instance of this class by giving the feature a Geometry.

Parameters:

geometry - a single geometry which makes up this feature object

Returns:

a new instance of this class defined by the values passed inside this static factory method

fromGeometry

public static Feature fromGeometry(@Nullable
                                   Geometry geometry,
                                   @Nullable
                                   BoundingBox bbox)

Create a new instance of this class by giving the feature a Geometry. You can also pass in a double array defining a bounding box.

Parameters:

geometry - a single geometry which makes up this feature object

bbox - optionally include a bbox definition as a double array

Returns:

a new instance of this class defined by the values passed inside this static factory method

fromGeometry

public static Feature fromGeometry(@Nullable
                                   Geometry geometry,
                                   @Nullable
                                   com.google.gson.JsonObject properties)

Create a new instance of this class by giving the feature a Geometry and optionally a set of properties.

Parameters:

geometry - a single geometry which makes up this feature object

properties - a JsonObject containing the feature properties

Returns:

a new instance of this class defined by the values passed inside this static factory method

fromGeometry

public static Feature fromGeometry(@Nullable
                                   Geometry geometry,
                                   @Nullable
                                   com.google.gson.JsonObject properties,
                                   @Nullable
                                   BoundingBox bbox)

Create a new instance of this class by giving the feature a Geometry, optionally a set of properties, and optionally pass in a bbox.

Parameters:

geometry - a single geometry which makes up this feature object

bbox - optionally include a bbox definition as a double array

properties - a JsonObject containing the feature properties

Returns:

a new instance of this class defined by the values passed inside this static factory method

fromGeometry

public static Feature fromGeometry(@Nullable
                                   Geometry geometry,
                                   @Nullable
                                   com.google.gson.JsonObject properties,
                                   @Nullable
                                   java.lang.String id)

Create a new instance of this class by giving the feature a Geometry, optionally a set of properties, and a String which represents the objects id.

Parameters:

geometry - a single geometry which makes up this feature object

properties - a JsonObject containing the feature properties

id - common identifier of this feature

Returns:

Feature

fromGeometry

public static Feature fromGeometry(@Nullable
                                   Geometry geometry,
                                   @NonNull
                                   com.google.gson.JsonObject properties,
                                   @Nullable
                                   java.lang.String id,
                                   @Nullable
                                   BoundingBox bbox)

Create a new instance of this class by giving the feature a Geometry, optionally a set of properties, and a String which represents the objects id.

Parameters:

geometry - a single geometry which makes up this feature object

properties - a JsonObject containing the feature properties

bbox - optionally include a bbox definition as a double array

id - common identifier of this feature

Returns:

Feature

type

@NonNull
public java.lang.String type()

This describes the TYPE of GeoJson geometry this object is, thus this will always return Feature.

Specified by:

type in interface GeoJson

Returns:

a String which describes the TYPE of geometry, for this object it will always return Feature

bbox

@Nullable
public BoundingBox bbox()

A Feature Collection might have a member named bbox to include information on the coordinate range for it's Features. The value of the bbox member MUST be a list of size 2*n where n is the number of dimensions represented in the contained feature geometries, with all axes of the most southwesterly point followed by all axes of the more northeasterly point. The axes order of a bbox follows the axes order of geometries.

Specified by:

bbox in interface GeoJson

Returns:

a list of double coordinate values describing a bounding box

id

@Nullable
public java.lang.String id()

A feature may have a commonly used identifier which is either a unique String or number.

Returns:

a String containing this features unique identification or null if one wasn't given during creation.

geometry

@Nullable
public Geometry geometry()

The geometry which makes up this feature. A Geometry object represents points, curves, and surfaces in coordinate space. One of the seven geometries provided inside this library can be passed in through one of the static factory methods.

Returns:

a single defined Geometry which makes this feature spatially aware

properties

@Nullable
public com.google.gson.JsonObject properties()

This contains the JSON object which holds the feature properties. The value of the properties member is a JsonObject and might be empty if no properties are provided.

Returns:

a JsonObject which holds this features current properties

toJson

public java.lang.String toJson()

This takes the currently defined values found inside this instance and converts it to a GeoJson string.

Specified by:

toJson in interface GeoJson

Returns:

a JSON string which represents this Feature

typeAdapter

public static com.google.gson.TypeAdapter<Feature> typeAdapter(com.google.gson.Gson gson)

Gson TYPE adapter for parsing Gson to this class.

Parameters:

gson - the built Gson object

Returns:

the TYPE adapter for this class

addStringProperty

public void addStringProperty(java.lang.String key,
                              java.lang.String value)

Convenience method to add a String member.

Parameters:

key - name of the member

value - the String value associated with the member

addNumberProperty

public void addNumberProperty(java.lang.String key,
                              java.lang.Number value)

Convenience method to add a Number member.

Parameters:

key - name of the member

value - the Number value associated with the member

addBooleanProperty

public void addBooleanProperty(java.lang.String key,
                               java.lang.Boolean value)

Convenience method to add a Boolean member.

Parameters:

key - name of the member

value - the Boolean value associated with the member

addCharacterProperty

public void addCharacterProperty(java.lang.String key,
                                 java.lang.Character value)

Convenience method to add a Character member.

Parameters:

key - name of the member

value - the Character value associated with the member

addProperty

public void addProperty(java.lang.String key,
                        com.google.gson.JsonElement value)

Convenience method to add a JsonElement member.

Parameters:

key - name of the member

value - the JsonElement value associated with the member

getStringProperty

public java.lang.String getStringProperty(java.lang.String key)

Convenience method to get a String member.

Parameters:

key - name of the member

Returns:

the value of the member, null if it doesn't exist

getNumberProperty

public java.lang.Number getNumberProperty(java.lang.String key)

Convenience method to get a Number member.

Parameters:

key - name of the member

Returns:

the value of the member, null if it doesn't exist

getBooleanProperty

public java.lang.Boolean getBooleanProperty(java.lang.String key)

Convenience method to get a Boolean member.

Parameters:

key - name of the member

Returns:

the value of the member, null if it doesn't exist

getCharacterProperty

public java.lang.Character getCharacterProperty(java.lang.String key)

Convenience method to get a Character member.

Parameters:

key - name of the member

Returns:

the value of the member, null if it doesn't exist

getProperty

public com.google.gson.JsonElement getProperty(java.lang.String key)

Convenience method to get a JsonElement member.

Parameters:

key - name of the member

Returns:

the value of the member, null if it doesn't exist

removeProperty

public com.google.gson.JsonElement removeProperty(java.lang.String key)

Removes the property from the object properties.

Parameters:

key - name of the member

Returns:

Removed property from the key string passed in through the parameter.

hasProperty

public boolean hasProperty(java.lang.String key)

Convenience method to check if a member with the specified name is present in this object.

Parameters:

key - name of the member

Returns:

true if there is the member has the specified name, false otherwise.

hasNonNullValueForProperty

public boolean hasNonNullValueForProperty(java.lang.String key)

Convenience method to check for a member by name as well as non-null value.

Parameters:

key - name of the member

Returns:

true if member is present with non-null value, false otherwise.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object