Object
AbstractResource
AbstractFeatureSet
ConcatenatedFeatureSet
- All Implemented Interfaces:
DataSet,FeatureSet,Resource
Exposes a sequence of
FeatureSets as a single one.
The concatenation is built from an array or collection of input feature sets,
copied verbatim in iteration order and without removal of duplicated elements.
All input feature sets must share a common type, or at least a common super-type.
The feature type of this concatenated set will be the
most specific type found among all input feature sets.
Identification
There is no identifier since this feature set is a computation result.Multi-threading
Concatenated feature set is immutable and thread-safe if all input feature sets are immutable and thread-safe.- Since:
- 1.0
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Field Summary
Fields inherited from class AbstractResource
listeners -
Constructor Summary
ConstructorsModifierConstructorDescriptionprotectedConcatenatedFeatureSet(Resource parent, FeatureSet[] sources) Creates a new feature set as a concatenation of the sequence of features given by thesources. -
Method Summary
Modifier and TypeMethodDescriptionprotected voidClears any cache in this resource, forcing the data to be recomputed when needed again.static FeatureSetcreate(Collection<? extends FeatureSet> sources) Creates a new feature set as a concatenation of the sequence of features given by thesources.static FeatureSetcreate(FeatureSet... sources) Creates a new feature set as a concatenation of the sequence of features given by thesources.protected MetadataInvoked in a synchronized block the first time thatgetMetadata()is invoked.features(boolean parallel) Returns a stream of all features contained in this concatenated dataset.Returns the union of the envelopes in all aggregated feature sets.Returns an estimation of the number of features in this set, or an empty value if unknown.getType()Returns the most specific feature type common to all feature sets given to the constructor.Requests a subset of features and/or feature properties from this resource.Methods inherited from class AbstractFeatureSet
getIdentifierMethods inherited from class AbstractResource
addListener, getMetadata, getSynchronizationLock, removeListenerMethods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitMethods inherited from interface Resource
addListener, getMetadata, removeListener
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Constructor Details
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ConcatenatedFeatureSet
Creates a new feature set as a concatenation of the sequence of features given by thesources. This constructor does not verify that the givensourcesarray contains at least two elements; this verification must be done by the caller. This constructor retains the givensourcesarray by direct reference; clone, if desired, shall be done by the caller.- Parameters:
parent- the parent resource, ornullif none.sources- the sequence of feature sets to expose in a single set. Must neither be null, empty nor contain a single element only.- Throws:
DataStoreException- if given feature sets does not share any common type.
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Method Details
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create
Creates a new feature set as a concatenation of the sequence of features given by thesources. The given array shall be non-empty. If the array contains only 1 element, that element is returned.- Parameters:
sources- the sequence of feature sets to expose in a single set.- Returns:
- the concatenation of given feature set.
- Throws:
DataStoreException- if given feature sets does not share any common type.
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create
Creates a new feature set as a concatenation of the sequence of features given by thesources. The given collection shall be non-empty. If the collection contains only 1 element, that element is returned.- Parameters:
sources- the sequence of feature sets to expose in a single set.- Returns:
- the concatenation of given feature set.
- Throws:
DataStoreException- if given feature sets does not share any common type.
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getType
Returns the most specific feature type common to all feature sets given to the constructor.- Returns:
- the common type of all features returned by this set.
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getFeatureCount
Returns an estimation of the number of features in this set, or an empty value if unknown. This is the sum of the estimations provided by all source sets, or empty if at least one source could not provide an estimation.- Overrides:
getFeatureCountin classAbstractFeatureSet- Returns:
- estimation of the number of features.
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features
Returns a stream of all features contained in this concatenated dataset. If theparallelargument isfalse, then datasets are traversed in the order they were specified at construction time. If theparallelargument istrue, then datasets are traversed in no determinist order. If an error occurred while reading the feature instances from a source, then the error is wrapped in aBackingStoreException.- Parameters:
parallel-truefor a parallel stream, orfalsefor a sequential stream.- Returns:
- all features contained in this dataset.
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subset
Requests a subset of features and/or feature properties from this resource.- Parameters:
query- definition of feature and feature properties filtering applied at reading time.- Returns:
- resulting subset of features (never
null). - Throws:
DataStoreException- if an error occurred while processing the query.- See Also:
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getEnvelope
Returns the union of the envelopes in all aggregated feature sets. This method tries to find a CRS common to all feature sets. If no common CRS can be found, then the envelope is absent.- Specified by:
getEnvelopein interfaceDataSet- Overrides:
getEnvelopein classAbstractResource- Returns:
- union of envelopes from all dependencies.
- Throws:
DataStoreException- if an error occurred while computing the envelope.
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createMetadata
Invoked in a synchronized block the first time thatgetMetadata()is invoked. The default implementation adds the information documented in the parent class, then adds the dependencies as lineages.- Overrides:
createMetadatain classAbstractFeatureSet- Returns:
- the newly created metadata, or
nullif unknown. - Throws:
DataStoreException- if an error occurred while reading metadata from the data stores.
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clearCache
protected void clearCache()Clears any cache in this resource, forcing the data to be recomputed when needed again. This method should be invoked if the data in underlying data store changed.- Overrides:
clearCachein classAbstractResource
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