geoview-core - v2.2.0
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    Class GeoJSON

    Class used to add GeoJSON layer to the map.

    Hierarchy (View Summary)

    Index

    Constructors

    constructor

    Properties

    hitTolerance listOfLayerEntryConfig olRootLayer? DEFAULT_DISPLAY_DATE_MODE_TO_GENERATE_CONFIGS DEFAULT_HIT_TOLERANCE DEFAULT_WAIT_PERIOD_METADATA_WARNING DEFAULT_WAIT_PERIOD_METADATA_WARNING_RECALL DEFAULT_WAIT_SLOW_FETCH_WARNING EXCLUDED_HEADERS EXCLUDED_HEADERS_GEN EXCLUDED_HEADERS_LAT EXCLUDED_HEADERS_LNG EXCLUDED_HEADERS_STYLE MAX_ESRI_FEATURES NAME_FIELD_KEYWORDS

    Methods

    addLayerLoadError allLayerStatusAreGreaterThanOrEqualTo createGeoViewLayers createGVLayer createVectorSource emitLayerEntryRegisterInit emitMessage fetchServiceMetadata getAllLayerEntryConfigs getClassName getGeoviewLayerConfig getGeoviewLayerId getGeoviewLayerName getLayerEntryNameOrGeoviewLayerName getMetadata getMetadataAccessPath getMetadataAccessPathIfExists hasMetadataAccessPath initGeoViewLayerEntries initGVLayer offLayerConfigCreated offLayerEntryProcessed offLayerEntryRegisterInit offLayerGroupCreated offLayerGVCreated offLayerMessage onCreateGVLayer onCreateVectorSource onCreateVectorSourceLoadFeatures onFetchServiceMetadata onInitGVLayer onInitLayerEntries onLayerConfigCreated onLayerEntryProcessed onLayerEntryRegisterInit onLayerGroupCreated onLayerGVCreated onLayerMessage onProcessLayerMetadata onProcessOneLayerEntry onValidateLayerEntryConfig onValidateListOfLayerEntryConfig setMetadataAccessPath validateLayerEntryConfig validateListOfLayerEntryConfig createGeoviewLayerConfig fetchJson fetchMetadata fetchText initGeoviewLayerConfig processConfig processFeatureInfoConfig processGeoviewLayerConfig

    Constructors

    Properties

    hitTolerance: number = AbstractGeoViewLayer.DEFAULT_HIT_TOLERANCE

    The default hit tolerance

    listOfLayerEntryConfig: TypeLayerEntryConfig[] = []

    An array of layer settings. In the schema, this attribute is optional. However, we define it as mandatory and if the configuration does not provide a value, we use an empty array instead of an undefined attribute.

    olRootLayer?: BaseLayer

    The OpenLayer root layer representing this GeoView Layer.

    DEFAULT_DISPLAY_DATE_MODE_TO_GENERATE_CONFIGS: DisplayDateMode = 'long'

    The default display date mode used when generating default configurations

    DEFAULT_HIT_TOLERANCE: number = 4

    The default hit tolerance the query should be using

    DEFAULT_WAIT_PERIOD_METADATA_WARNING: number = ...

    The default waiting time before showing a warning about the metadata taking a long time to get processed

    DEFAULT_WAIT_PERIOD_METADATA_WARNING_RECALL: number = ...
    DEFAULT_WAIT_SLOW_FETCH_WARNING: number = ...

    The maximum delay to wait before we warn about the features fetch taking a long time

    EXCLUDED_HEADERS: string[] = ...
    EXCLUDED_HEADERS_GEN: string[] = ...
    EXCLUDED_HEADERS_LAT: string[] = ...
    EXCLUDED_HEADERS_LNG: string[] = ...
    EXCLUDED_HEADERS_STYLE: string[] = ...
    MAX_ESRI_FEATURES: 200000
    NAME_FIELD_KEYWORDS: string[] = ...

    Methods

    • This method is used to create the layers specified in the listOfLayerEntryConfig attribute inherited from its parent.

      Normally, it is the second method called in the life cycle of a GeoView layer, the first one being the constructor. Its code is the same for all child classes. It must first validate that the olLayers attribute is null indicating that the method has never been called before for this layer. If this is not the case, an error message must be sent. Then, it calls the abstract method getAdditionalServiceDefinition. For example, when the child is a WFS service, this method executes the GetCapabilities request and saves the result in the metadata attribute of the class. It also process the layer's metadata for each layer in the listOfLayerEntryConfig tree in order to define the missing pieces of the layer's configuration. Layer's configuration can come from the configuration of the GeoView layer or from the information saved by the method #processListOfLayerMetadata, priority being given to the first of the two. When the GeoView layer does not have a service definition, the getAdditionalServiceDefinition method does nothing.

      Finally, the processListOfLayerEntryConfig is called to instantiate each layer identified by the listOfLayerEntryConfig attribute. This method will also register the layers to all layer sets that offer this possibility. For example, if a layer is queryable, it will subscribe to the details-panel and every time the user clicks on the map, the panel will ask the layer to return the descriptive information of all the features in a tolerance radius. This information will be used to populate the details-panel.

      Parameters

      • displayDateMode: DisplayDateMode

        The display date mode to use for processing time dimensions in the metadata

      • OptionalmapProjection: Projection

        Optional map projection

      • OptionalabortSignal: AbortSignal

        Optional AbortSignal used to cancel the layer creation process

      Returns Promise<ConfigBaseClass[]>

      A promise that resolves with the config base classes created

    • Emits a layer-specific message event with localization support.

      Parameters

      • messageKey: string

        The key used to lookup the localized message OR message

      • messageParams: string[] | undefined = []

        Optional array of parameters to be interpolated into the localized message

      • messageType: SnackbarType = 'info'

        The message type

      • notification: boolean = false

        Optional whether to show this as a notification. Defaults to false

      Returns void

      this.emitMessage(
        'layers.fetchProgress',
        ['50', '100'],
        messageType: 'error',
        true
      );

    • Overrides the loading of the vector features for the layer by fetching GeoJSON data and converting it into OpenLayers Feature feature instances.

      Parameters

      • layerConfig: VectorLayerEntryConfig

        The configuration object for the vector layer, containing source and data access information

      • sourceOptions: Options<Feature<Geometry>>

        The OpenLayers vector source options associated with the layer

      • readOptions: ReadOptions

        Options controlling how features are read, including the target featureProjection

      Returns Promise<Feature<Geometry>[]>

      A promise that resolves to an array of OpenLayers features

    • Overrides the way the metadata is fetched.

      Resolves with the Json object or undefined when no metadata is to be expected for a particular layer type.

      Type Parameters

      • T = TypeMetadataGeoJSON | undefined

      Parameters

      • OptionalabortSignal: AbortSignal

        Optional AbortSignal used to cancel the layer creation process

      Returns Promise<T>

      A promise that resolves with the metadata or undefined when no metadata for the particular layer type

      When the metadata fetch fails or contains an error

    • Overrides the way the layer metadata is processed.

      Parameters

      • layerConfig: VectorLayerEntryConfig

        The layer entry configuration to process

      • displayDateMode: DisplayDateMode

        The display date mode to use for processing time dimensions in the metadata

      • OptionalmapProjection: Projection

        Optional map projection

      • OptionalabortSignal: AbortSignal

        Optional AbortSignal used to cancel the layer creation process

      Returns Promise<VectorLayerEntryConfig>

      A promise that resolves once the layer entry configuration has gotten its metadata processed

    • Creates a configuration object for a GeoJson Feature layer.

      This function constructs a TypeGeoJSONLayerConfig object that describes an GeoJson Feature layer and its associated entry configurations based on the provided parameters.

      Parameters

      • geoviewLayerId: string

        A unique identifier for the GeoView layer.

      • geoviewLayerName: string

        The display name of the GeoView layer.

      • metadataAccessPath: string | undefined

        The URL or path to access metadata or feature data.

      • isTimeAware: boolean | undefined

        Indicates whether the layer supports time-based filtering.

      • layerEntries: TypeLayerEntryShell[]

        An array of layer entries objects to be included in the configuration.

      Returns TypeGeoJSONLayerConfig

      The constructed configuration object for the GeoJson Feature layer.

    • Fetches json data from the given URL using settings defined in the vector source configuration.

      Supports both GET and POST requests depending on the presence of postSettings.

      Parameters

      • url: string

        The URL to fetch data from

      • OptionalpostSettings: TypePostSettings

        Optional POST settings from the layer config

      Returns Promise<unknown>

      A promise that resolves to the fetched JSON response

    • Fetches the metadata for a typical GeoJson class.

      Parameters

      • url: string

        The url to query the metadata from

      • OptionalabortSignal: AbortSignal

        Optional AbortSignal used to cancel the layer creation process

      Returns Promise<TypeMetadataGeoJSON>

      A promise that resolves to the metadata object

      When the request exceeds the timeout duration

      When the request was aborted by the caller's signal

      When the response is not OK (non-2xx)

      When the JSON response is empty

    • Fetches text data from the given URL using settings defined in the vector source configuration.

      Supports both GET and POST requests depending on the presence of postSettings.

      Parameters

      • url: string

        The URL to fetch data from

      • OptionalpostSettings: TypePostSettings

        Optional POST settings from the layer config

      Returns Promise<string>

      A promise that resolves to the fetched text response

    • Initializes a GeoView layer configuration for a GeoJson layer.

      This method creates a basic TypeGeoviewLayerConfig using the provided ID, name, and metadata access path URL. It then initializes the layer entries by calling initGeoViewLayerEntries, which may involve fetching metadata or sublayer info.

      Parameters

      • geoviewLayerId: string

        A unique identifier for the layer.

      • geoviewLayerName: string

        The display name of the layer.

      • metadataAccessPath: string

        The full service URL to the layer endpoint.

      • OptionalisTimeAware: boolean

        Indicates whether the layer supports time-based filtering.

      Returns Promise<TypeGeoviewLayerConfig>

      A promise that resolves to an initialized GeoView layer configuration with layer entries.

    • Processes a GeoJSON GeoviewLayerConfig and returns a promise that resolves to an array of ConfigBaseClass layer entry configurations.

      This method:

      1. Creates a Geoview layer configuration using the provided parameters.
      2. Instantiates a layer with that configuration.
      3. Processes the layer configuration and returns the result.

      Parameters

      • geoviewLayerId: string

        The unique identifier for the GeoView layer

      • geoviewLayerName: string

        The display name for the GeoView layer

      • url: string

        The URL of the service endpoint

      • layerIds: string[]

        An array of layer IDs to include in the configuration

      • isTimeAware: boolean

        Indicates if the layer is time aware

      Returns Promise<ConfigBaseClass[]>

      A promise that resolves to an array of layer configurations

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    addLayerLoadErrorallLayerStatusAreGreaterThanOrEqualTocreateGeoViewLayerscreateGVLayercreateVectorSourceemitLayerEntryRegisterInitemitMessagefetchServiceMetadatagetAllLayerEntryConfigsgetClassNamegetGeoviewLayerConfiggetGeoviewLayerIdgetGeoviewLayerNamegetLayerEntryNameOrGeoviewLayerNamegetMetadatagetMetadataAccessPathgetMetadataAccessPathIfExistshasMetadataAccessPathinitGeoViewLayerEntriesinitGVLayeroffLayerConfigCreatedoffLayerEntryProcessedoffLayerEntryRegisterInitoffLayerGroupCreatedoffLayerGVCreatedoffLayerMessageonCreateGVLayeronCreateVectorSourceonCreateVectorSourceLoadFeaturesonFetchServiceMetadataonInitGVLayeronInitLayerEntriesonLayerConfigCreatedonLayerEntryProcessedonLayerEntryRegisterInitonLayerGroupCreatedonLayerGVCreatedonLayerMessageonProcessLayerMetadataonProcessOneLayerEntryonValidateLayerEntryConfigonValidateListOfLayerEntryConfigsetMetadataAccessPathvalidateLayerEntryConfigvalidateListOfLayerEntryConfigcreateGeoviewLayerConfigfetchJsonfetchMetadatafetchTextinitGeoviewLayerConfigprocessConfigprocessFeatureInfoConfigprocessGeoviewLayerConfig