Package org.geotools.data.store

Class ContentFeatureCollection

Object
ContentFeatureCollection
All Implemented Interfaces:
SimpleFeatureCollection, FeatureCollection<SimpleFeatureType,SimpleFeature>
public class ContentFeatureCollection extends Object implements SimpleFeatureCollection
A FeatureCollection that completely delegates to a backing FetaureSource#getReader
Author:
Jody Garnett (Refractions Research, Inc.)

  • Field Details

    • LOGGER

      protected static final Logger LOGGER

    • featureSource

      protected ContentFeatureSource featureSource
      feature store the collection originated from.

    • query

      protected Query query

    • featureType

      protected SimpleFeatureType featureType
      feature (possibly retyped from feautre source original) type

    • state

      protected ContentState state
      state of the feature source

  • Constructor Details

  • Method Details

    • getSchema

      public SimpleFeatureType getSchema()
      Description copied from interface: FeatureCollection
      The schema for the child feature members of this collection.

      Represents the most general FeatureType in common to all the features in this collection.

      • For a collection backed by a shapefiles (or database tables) the FeatureType returned by getSchema() will complete describe each and every child in the collection.
      • For mixed content FeatureCollections you will need to check the FeatureType of each Feature as it is retrived from the collection
      • The degenerate case returns the "_Feature" FeatureType, where the only thing known is that the contents are Features.
      Specified by:
      getSchema in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
      Returns:
      FeatureType describing the "common" schema to all child features of this collection

    • accepts

      public void accepts(FeatureVisitor visitor, ProgressListener progress) throws IOException
      Description copied from interface: FeatureCollection
      Visit the contents of a feature collection.

      The order of traversal is dependent on the FeatureCollection implementation; some collections are able to make efficient use of an internal index in order to quickly visit features located in the same region.

      Specified by:
      accepts in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
      Parameters:
      visitor - Closure applied to each feature in turn.
      progress - Used to report progress, may be used to interrupt the operation
      Throws:
      IOException

    • features

      public SimpleFeatureIterator features()
      Description copied from interface: SimpleFeatureCollection
      Obtain a SimpleFeatureIterator of the Features within this SimpleFeatureCollection.

      The implementation of FeatureIterator must adhere to the rules of fail-fast concurrent modification. In addition (to allow for resource backed collections) the SimpleFeatureIterator.close() method must be called.

      Example use: 

      
 SimpleFeatureIterator iterator=collection.features();
 try {
     while( iterator.hasNext()  ){
          SimpleFeature feature = iterator.next();
          System.out.println( feature.getID() );
     }
 }
 finally {
     iterator.close();
 }
      Specified by:
      features in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
      Specified by:
      features in interface SimpleFeatureCollection
      Returns:
      A FeatureIterator.

    • getBounds

      public ReferencedEnvelope getBounds()
      Description copied from interface: FeatureCollection
      Get the total bounds of this collection which is calculated by doing a union of the bounds of each feature inside of it
      Specified by:
      getBounds in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
      Returns:
      An Envelope containing the total bounds of this collection.

    • size

      public int size()
      Description copied from interface: FeatureCollection
      Please note this operation may be expensive when working with remote content.
      Specified by:
      size in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
      See Also:

    • isEmpty

      public boolean isEmpty()
      Description copied from interface: FeatureCollection
      Returns true if this feature collection contains no features.
      Specified by:
      isEmpty in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
      Returns:
      true if this collection contains no features

    • sort

      public SimpleFeatureCollection sort(SortBy sort)
      Description copied from interface: FeatureCollection
      Obtained sorted contents.

      This method may not be supported by all implementations, consider the use of FeatureSource.features( Query ).

      Specified by:
      sort in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
      Specified by:
      sort in interface SimpleFeatureCollection
      Parameters:
      sort - Sort order
      Returns:
      FeatureCollection sorted in the indicated order

    • subCollection

      public SimpleFeatureCollection subCollection(Filter filter)
      Description copied from interface: FeatureCollection
      SimpleFeatureCollection "view" indicated by provided filter.

      The contents of the returned SimpleFeatureCollection are determined by applying the provider Filter to the entire contents of this FeatureCollection. The result is "live" and modifications will be shared.

      This method is used cut down on the number of filter based methods required for a useful SimpleFeatureCollection construct. The FeatureCollections returned really should be considered as a temporary "view" used to control the range of a removeAll, or modify operation.

      Example Use: 

      
 collection.subCollection( filter ).clear();
      The above recommended use is agreement with the Collections API precident of List.subList( start, end ).

      The results of subCollection:

      • are to be considered unordered
      • may be an ordered FeatureList if requested when sortBy is indicated
      Specified by:
      subCollection in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
      Specified by:
      subCollection in interface SimpleFeatureCollection
      Returns:
      SimpleFeatureCollection identified as subset.
      See Also:
      • FeatureList

    • contains

      public boolean contains(Object o)
      Returns true if this collection contains the specified element. .

      This implementation iterates over the elements in the collection, checking each element in turn for equality with the specified element.

      Specified by:
      contains in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
      Parameters:
      o - object to be checked for containment in this collection.
      Returns:
      true if this collection contains the specified element.
      See Also:

    • containsAll

      public boolean containsAll(Collection<?> c)
      Returns true if this collection contains all of the elements in the specified collection.

      Specified by:
      containsAll in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
      Parameters:
      c - collection to be checked for containment in this collection.
      Returns:
      true if this collection contains all of the elements in the specified collection.
      Throws:
      NullPointerException - if the specified collection is null.
      See Also:

    • remove

      public boolean remove(Object o)

    • toArray

      public Object[] toArray()
      Array of all the elements.
      Specified by:
      toArray in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
      Returns:
      an array containing all of the elements in this collection.
      See Also:

    • toArray

      public <T> T[] toArray(T[] array)
      Specified by:
      toArray in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
      See Also:

    • getID

      public String getID()
      Description copied from interface: FeatureCollection
      ID used when serializing to GML
      Specified by:
      getID in interface FeatureCollection<SimpleFeatureType,SimpleFeature>