- All Implemented Interfaces:
JsonSerializable
,Loadable
A feature collection is typically used to hold features with mixed geometry or unstructured data. The features are stored in feature collection tables, where all the features that belong to a table share the same attribute schema (fields), geometry type, and spatial reference. The feature collection groups these different feature tables together so that you can display and manage them in a single layer.
There are a number of ways to create a feature collection:
- You can build a feature collection in ArcGIS Online by creating a sketch layer and saving it as part of the map. The sketch layer may contain points, lines, polygons, and associated text to describe things in the map. Because they have different schema and geometry types, these features are stored in several distinct feature collection tables.
- You can import features into ArcGIS Online from files, such as CSV or shapefiles, and save them in a separate
PortalItem
(of typePortalItem.Type.FEATURE_COLLECTION
). - You can create a FeatureCollection programmatically by constructing an empty FeatureCollectionTable and adding features to the table.
If you need to share the feature collection between several maps or scenes, it is best to store it as a separate portal item. If you need to make frequent (near real-time) edits to features in a collection, consider storing these in a feature service instead, because the feature collection is not refreshed until the map or portal item is reloaded. If features are used by a single map or are not subject to frequent updates, it might be best to store them directly in the map. Edits made to features stored in a map will be saved when the map is saved. Edits made to features stored in a portal item (and loaded into a map, for example) must be explicitly saved to the original portal item.
To render the features in a map or scene, construct a FeatureCollectionLayer
using the FeatureCollection
and add the layer to the collection of operational layers.
- Since:
- 100.0.0
- See Also:
-
Property Summary
TypePropertyDescriptionThe load error.The load status. -
Constructor Summary
ConstructorDescriptionCreates an empty FeatureCollection.FeatureCollection
(PortalItem portalItem) Creates a feature collection object from aPortalItem
.FeatureCollection
(Iterable<FeatureCollectionTable> featureCollectionTables) Creates a FeatureCollection from a set of feature collection tables. -
Method Summary
Modifier and TypeMethodDescriptionvoid
addDoneLoadingListener
(Runnable listener) Adds a listener to the loadable resource that is invoked when loading has completed.void
Adds aLoadStatusChangedListener
to the loadable resource that is invoked whenever the load status changes.void
Cancels loading metadata for the object.static FeatureCollection
Creates a FeatureCollection instance from a JSON string.getItem()
The item the feature collection has been created from.Gets the value of theloadError
property.Gets the value of theloadStatus
property.Gets the feature collection tables in this FeatureCollection.Gets unknown data from the source JSON.Gets unsupported data from the source JSON.void
Loads the metadata of the loadable resource asynchronously.The load error.The load status.boolean
removeDoneLoadingListener
(Runnable listener) Removes a done loading listener from the loadable resource.boolean
Removes aLoadStatusChangedListener
from the loadable resource.void
Loads or retries loading metadata for the object asynchronously.saveAsAsync
(Portal portal, PortalFolder portalFolder, String title, Iterable<String> tags, String description, byte[] thumbnailData) Saves the feature collection as a newPortalItem
(of typePortalItem.Type.FEATURE_COLLECTION
).Saves any changes that have been made to the FeatureCollection to the associatedPortalItem
.toJson()
Serializes this object to a JSON string.
-
Property Details
-
loadStatus
- Specified by:
loadStatusProperty
in interfaceLoadable
- See Also:
-
loadError
- Specified by:
loadErrorProperty
in interfaceLoadable
- See Also:
-
-
Constructor Details
-
FeatureCollection
public FeatureCollection()Creates an empty FeatureCollection.- Since:
- 100.0.0
-
FeatureCollection
Creates a FeatureCollection from a set of feature collection tables.- Parameters:
featureCollectionTables
- the feature collection tables to add to this FeatureCollection- Since:
- 100.0.0
-
FeatureCollection
Creates a feature collection object from aPortalItem
.If the portal item is not in
LoadStatus.LOADED
state it will be loaded automatically when this FeatureCollection instance is loaded.If the loaded portalItem is not of type
PortalItem.Type.FEATURE_COLLECTION
the FeatureCollection will fail to load.- Parameters:
portalItem
- the PortalItem associated with this FeatureCollection instance- Throws:
IllegalArgumentException
- if the portalItem is null- Since:
- 100.0.0
- See Also:
-
-
Method Details
-
getTables
Gets the feature collection tables in this FeatureCollection. The list is modifiable, that is, tables can be added and removed.- Returns:
- a modifiable list of feature collection tables
- Since:
- 100.0.0
-
getItem
The item the feature collection has been created from.This is only available if the FeatureCollection is associated with a
PortalItem
. This is the case if the FeatureCollection had been created from an item usingFeatureCollection(PortalItem)
or if the FeatureCollection had been previously saved as aPortalItem
.- Returns:
- the associated Item or null if this FeatureCollection is not associated with an Item
- Since:
- 100.0.0
-
fromJson
Creates a FeatureCollection instance from a JSON string.- Parameters:
json
- a JSON string that represents a FeatureCollection- Returns:
- a FeatureCollection instance
- Throws:
IllegalArgumentException
- if json is null or empty- Since:
- 100.0.0
-
toJson
Description copied from interface:JsonSerializable
Serializes this object to a JSON string. Note that unknown JSON is omitted from the serialized string.- Specified by:
toJson
in interfaceJsonSerializable
- Returns:
- a JSON string
-
getUnknownJson
Description copied from interface:JsonSerializable
Gets unknown data from the source JSON.Unknown JSON is a Map of values not defined in the ArcGIS specification used to create this object but found in the source JSON. If the object is written back to JSON, any unknown JSON data is not persisted. The ArcGIS specification may be for a web map, web scene, REST API, and so on.
- Specified by:
getUnknownJson
in interfaceJsonSerializable
- Returns:
- an unmodifiable Map containing unknown data from the source JSON
-
getUnsupportedJson
Description copied from interface:JsonSerializable
Gets unsupported data from the source JSON.Unsupported JSON is a Map of values defined in the ArcGIS specification used to create this object but not currently used in this API. If the object is written back to JSON, any unsupported JSON data is persisted. The ArcGIS specification may be from a web map, web scene, REST API, and so on.
- Specified by:
getUnsupportedJson
in interfaceJsonSerializable
- Returns:
- an unmodifiable Map containing unsupported data from the source JSON
-
saveAsAsync
public ListenableFuture<PortalItem> saveAsAsync(Portal portal, PortalFolder portalFolder, String title, Iterable<String> tags, String description, byte[] thumbnailData) Saves the feature collection as a newPortalItem
(of typePortalItem.Type.FEATURE_COLLECTION
).To be saved, the FeatureCollection does not need to be associated with an existing
PortalItem
object, but it must be loaded.Once saved, the
getItem()
will be populated with the new portal item. Note that if the FeatureCollection already had a validPortalItem
(either because the FeatureCollection was created using a portal item or was previously saved), theFeatureCollection.itemProperty()
will be replaced with a newPortalItem
, effectively duplicating the feature collection on the portal.- Parameters:
portal
- the portal on which to save the FeatureCollection; must not be nullportalFolder
- a PortalFolder belonging to the current user in which to save the FeatureCollection, or null to save it in the user's root foldertitle
- a title for the FeatureCollection; must not be null or emptytags
- a list of tags to associate with the FeatureCollection, or null if nonedescription
- a description for the FeatureCollection, or null if nonethumbnailData
- thumbnail data for the FeatureCollection, or null if none- Returns:
- a ListenableFuture for tracking when the operation is done and getting the result; also allows
cancellation. Calling
get()
on the returned future may throw an ExecutionException with its cause set to an exception as follows:IOException
if the network request fails
- Throws:
IllegalArgumentException
- if portal or title is null, or title is an empty stringIllegalStateException
- if the FeatureCollection is not loadedArcGISRuntimeException
- if the currentLicenseLevel
is too low for this operation (LicenseLevel.BASIC
or higher is required to save feature collections to a portal)- Since:
- 100.0.0
-
saveAsync
Saves any changes that have been made to the FeatureCollection to the associatedPortalItem
.Updates the FeatureCollection content data on the portal and the portal item properties stored on the portal to match those stored within the
getItem()
object.The FeatureCollection must have been constructed using the FeatureCollection(PortalItem) constructor to associate it with a
PortalItem
object, or must have been previously saved usingsaveAsAsync(Portal, PortalFolder, String, Iterable, String, byte[])
. The FeatureCollection must be loaded.If the portal associated with the item is not loaded, it will be loaded automatically. If the portal requires a credential that has not been supplied, it should have been previously loaded.
- Returns:
- a ListenableFuture for tracking when the operation is done and getting the result; also allows
cancellation. Calling
get()
on the returned future may throw an ExecutionException with its cause set to an exception as follows:IOException
if the network request fails
- Throws:
IllegalStateException
- if the FeatureCollection is not loaded or is not associated with a PortalItem objectArcGISRuntimeException
- if the currentLicenseLevel
is too low for this operation (LicenseLevel.BASIC
or higher is required to save feature collections to a portal)- Since:
- 100.0.0
-
getLoadStatus
Gets the value of theloadStatus
property.- Specified by:
getLoadStatus
in interfaceLoadable
- Property description:
- Returns:
- the value of the
loadStatus
property - See Also:
-
getLoadError
Gets the value of theloadError
property.- Specified by:
getLoadError
in interfaceLoadable
- Property description:
- Returns:
- the value of the
loadError
property - See Also:
-
cancelLoad
public void cancelLoad()Description copied from interface:Loadable
Cancels loading metadata for the object.Cancels loading the metadata if the object is loading, and always invokes the done loading listener.
A load operation that is in progress (
LoadStatus.LOADING
state) can be cancelled by calling this method and the resource will transition fromLoadStatus.LOADING
toLoadStatus.FAILED_TO_LOAD
state. If the load operation was successfully cancelled, a CancellationException will be returned fromLoadable.getLoadError()
.Cancellation should be used carefully because all enqueued done loading listeners for that resource instance will get invoked with an error stating that the operation was cancelled. Thus, one component in the application can cancel the load operation initiated by other components.
This method does nothing if the resource is not in
LoadStatus.LOADING
state.- Specified by:
cancelLoad
in interfaceLoadable
-
loadAsync
public void loadAsync()Description copied from interface:Loadable
Loads the metadata of the loadable resource asynchronously.The load status changes from
LoadStatus.NOT_LOADED
toLoadStatus.LOADING
. A listener can be added viaLoadable.addDoneLoadingListener(java.lang.Runnable)
that is invoked upon completion of the asynchronous load operation.If the load operation completes successfully, the load status will be
LoadStatus.LOADED
, which means the resource has loaded its metadata.If the load operation failed, the load status will be
LoadStatus.FAILED_TO_LOAD
and the error can be retrieved by callingLoadable.getLoadError()
.This method can be called concurrently and repeatedly, but only one attempt is ever made to perform the load operation. If a load operation is already in progress (
LoadStatus.LOADING
state) whenloadAsync
is called, it simply piggy-backs on the outstanding operation and the done loading listener added to the loadable resource is enqueued to be invoked when that operation completes. If the operation has already completed (LoadStatus.LOADED
orLoadStatus.FAILED_TO_LOAD
state) whenloadAsync
is called, the done loading listener is immediately invoked when added to the loadable resource.If a loadable resource has failed to load, calling
loadAsync
on it subsequently will not change its state. The done loading listener will be invoked immediately when added to the loadable resource. In order to retry loading the resource,Loadable.retryLoadAsync()
needs to be used.A load operation that is in progress (
LoadStatus.LOADING
state) can be cancelled by callingLoadable.cancelLoad()
. -
retryLoadAsync
public void retryLoadAsync()Description copied from interface:Loadable
Loads or retries loading metadata for the object asynchronously.Will retry loading the metadata if the object's load status is
LoadStatus.FAILED_TO_LOAD
. Will load the object if it is not loaded. Will not retry to load the object if the object is loaded.For more details on the load process see
Loadable.loadAsync()
.- Specified by:
retryLoadAsync
in interfaceLoadable
-
addDoneLoadingListener
Description copied from interface:Loadable
Adds a listener to the loadable resource that is invoked when loading has completed.The listener may be added at any point, whether the loadable resource has already completed loading or not.
- For resources that are not loaded when the listener is added (LoadStatus is NOT_LOADED or LOADING): When the resource completes loading, the listener will be invoked on the UI thread if it is added from the UI thread, otherwise it is not guaranteed on which thread the listener is invoked.
- For resources that are already loaded when the listener is added (LoadStatus is LOADED or FAILED_TO_LOAD): The listener will be called immediately, on the current thread.
Alternatively, to be notified when there is any change in the load status, add a listener to the
Loadable.loadStatusProperty()
instead.- Specified by:
addDoneLoadingListener
in interfaceLoadable
- Parameters:
listener
- a Runnable that is invoked upon completion of the load operation
-
removeDoneLoadingListener
Description copied from interface:Loadable
Removes a done loading listener from the loadable resource.- Specified by:
removeDoneLoadingListener
in interfaceLoadable
- Parameters:
listener
- the listener to be removed- Returns:
- true if the listener was removed, otherwise false
-
addLoadStatusChangedListener
Description copied from interface:Loadable
Adds aLoadStatusChangedListener
to the loadable resource that is invoked whenever the load status changes.Adding this listener on the UI thread will cause it to be invoked on the UI thread, otherwise it is not guaranteed on which thread the listener is invoked.
The listener will not be called if added to a loadable resource that has already completed loading. To be notified when a loadable resource has completed loading, including if the resource is already loaded when the listener is added, use the
Loadable.addDoneLoadingListener(Runnable)
method.- Specified by:
addLoadStatusChangedListener
in interfaceLoadable
- Parameters:
listener
- theLoadStatusChangedListener
to be added
-
removeLoadStatusChangedListener
Description copied from interface:Loadable
Removes aLoadStatusChangedListener
from the loadable resource.- Specified by:
removeLoadStatusChangedListener
in interfaceLoadable
- Parameters:
listener
- theLoadStatusChangedListener
to be removed- Returns:
- true if the listener was removed, otherwise false
-
loadStatusProperty
Description copied from interface:Loadable
The load status.- Specified by:
loadStatusProperty
in interfaceLoadable
- Returns:
- the
loadStatus
property - See Also:
-
loadErrorProperty
Description copied from interface:Loadable
The load error.- Specified by:
loadErrorProperty
in interfaceLoadable
- Returns:
- the
loadError
property - See Also:
-