Module com.esri.arcgisruntime
Package com.esri.arcgisruntime.data

Class FeatureCollection

java.lang.Object
com.esri.arcgisruntime.data.FeatureCollection
All Implemented Interfaces:
JsonSerializable, Loadable
public final class FeatureCollection extends Object implements Loadable, JsonSerializable
A feature collection represents a lightweight collection of features that can be saved in a map or portal item.

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 type PortalItem.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 Details

  • Constructor Details

    • FeatureCollection

      public FeatureCollection()
      Creates an empty FeatureCollection.
      Since:
      100.0.0

    • FeatureCollection

      public FeatureCollection(Iterable<FeatureCollectionTable> featureCollectionTables)
      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

      public FeatureCollection(PortalItem portalItem)
      Creates a feature collection object from a PortalItem.

      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

      public List<FeatureCollectionTable> 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

      public Item 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 using FeatureCollection(PortalItem) or if the FeatureCollection had been previously saved as a PortalItem.

      Returns:
      the associated Item or null if this FeatureCollection is not associated with an Item
      Since:
      100.0.0

    • fromJson

      public static FeatureCollection fromJson(String json)
      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

      public String 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 interface JsonSerializable
      Returns:
      a JSON string

    • getUnknownJson

      public Map<String,Object> 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 interface JsonSerializable
      Returns:
      an unmodifiable Map containing unknown data from the source JSON

    • getUnsupportedJson

      public Map<String,Object> 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 interface JsonSerializable
      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 new PortalItem (of type PortalItem.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 valid PortalItem (either because the FeatureCollection was created using a portal item or was previously saved), the FeatureCollection.itemProperty() will be replaced with a new PortalItem, effectively duplicating the feature collection on the portal.

      Parameters:
      portal - the portal on which to save the FeatureCollection; must not be null
      portalFolder - a PortalFolder belonging to the current user in which to save the FeatureCollection, or null to save it in the user's root folder
      title - a title for the FeatureCollection; must not be null or empty
      tags - a list of tags to associate with the FeatureCollection, or null if none
      description - a description for the FeatureCollection, or null if none
      thumbnailData - 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:
      Throws:
      IllegalArgumentException - if portal or title is null, or title is an empty string
      IllegalStateException - if the FeatureCollection is not loaded
      ArcGISRuntimeException - if the current LicenseLevel is too low for this operation (LicenseLevel.BASIC or higher is required to save feature collections to a portal)
      Since:
      100.0.0

    • saveAsync

      public ListenableFuture<PortalItem> saveAsync()
      Saves any changes that have been made to the FeatureCollection to the associated PortalItem.

      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 using saveAsAsync(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:
      Throws:
      IllegalStateException - if the FeatureCollection is not loaded or is not associated with a PortalItem object
      ArcGISRuntimeException - if the current LicenseLevel is too low for this operation (LicenseLevel.BASIC or higher is required to save feature collections to a portal)
      Since:
      100.0.0

    • getLoadStatus

      public LoadStatus getLoadStatus()
      Gets the value of the loadStatus property.
      Specified by:
      getLoadStatus in interface Loadable
      Property description:
      Returns:
      the value of the loadStatus property
      See Also:

    • getLoadError

      public ArcGISRuntimeException getLoadError()
      Gets the value of the loadError property.
      Specified by:
      getLoadError in interface Loadable
      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 from LoadStatus.LOADING to LoadStatus.FAILED_TO_LOAD state. If the load operation was successfully cancelled, a CancellationException will be returned from Loadable.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 interface Loadable

    • 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 to LoadStatus.LOADING. A listener can be added via Loadable.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 calling Loadable.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) when loadAsync 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 or LoadStatus.FAILED_TO_LOAD state) when loadAsync 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 calling Loadable.cancelLoad().

      Specified by:
      loadAsync in interface Loadable

    • 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 interface Loadable

    • addDoneLoadingListener

      public void addDoneLoadingListener(Runnable listener)
      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 interface Loadable
      Parameters:
      listener - a Runnable that is invoked upon completion of the load operation

    • removeDoneLoadingListener

      public boolean removeDoneLoadingListener(Runnable listener)
      Description copied from interface: Loadable
      Removes a done loading listener from the loadable resource.
      Specified by:
      removeDoneLoadingListener in interface Loadable
      Parameters:
      listener - the listener to be removed
      Returns:
      true if the listener was removed, otherwise false

    • addLoadStatusChangedListener

      public void addLoadStatusChangedListener(LoadStatusChangedListener listener)
      Description copied from interface: Loadable
      Adds a LoadStatusChangedListener 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 interface Loadable
      Parameters:
      listener - the LoadStatusChangedListener to be added

    • removeLoadStatusChangedListener

      public boolean removeLoadStatusChangedListener(LoadStatusChangedListener listener)
      Description copied from interface: Loadable
      Removes a LoadStatusChangedListener from the loadable resource.
      Specified by:
      removeLoadStatusChangedListener in interface Loadable
      Parameters:
      listener - the LoadStatusChangedListener to be removed
      Returns:
      true if the listener was removed, otherwise false

    • loadStatusProperty

      public ReadOnlyObjectProperty<LoadStatus> loadStatusProperty()
      Description copied from interface: Loadable
      The load status.
      Specified by:
      loadStatusProperty in interface Loadable
      Returns:
      the loadStatus property
      See Also:

    • loadErrorProperty

      public ReadOnlyObjectProperty<ArcGISRuntimeException> loadErrorProperty()
      Description copied from interface: Loadable
      The load error.
      Specified by:
      loadErrorProperty in interface Loadable
      Returns:
      the loadError property
      See Also: