Package org.geotools.feature.collection

Class AdaptorFeatureCollection

    • Method Detail

      • 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.

      • 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:
        Collection.contains(Object)

      • toString

        public String toString()
        Returns a string representation of this collection.
        Overrides:
        toString in class Object
        Returns:
        a string representation of this collection.

      • iterator

        public final Iterator<SimpleFeature> iterator()
        Please implement!

        Note: If you return a ResourceIterator, the default implemntation of close( Iterator ) will know what to do.

      • close

        public final void close​(Iterator<SimpleFeature> close)
        Clean up after any resources assocaited with this iteartor in a manner similar to JDO collections. Example (safe) use: 
        
 Iterator iterator = collection.iterator();
 try {
     for( Iterator i=collection.iterator(); i.hasNext();){
          Feature feature = (Feature) i.hasNext();
          System.out.println( feature.getID() );
     }
 }
 finally {
     collection.close( iterator );
 }

      • openIterator

        protected abstract Iterator<SimpleFeature> openIterator()
        Open an Iterator, we will call close( iterator ).

        Please subclass to provide your own iterator - note iterator() is implemented to call open() and track the results in for later purge().

        Returns:
        Iterator based on resource use

      • closeIterator

        protected abstract void closeIterator​(Iterator<SimpleFeature> close)
        Please override to cleanup after your own iterators, and any used resources.

        As an example if the iterator was working off a File then the inputstream should be closed.

        Subclass must call super.close( close ) to allow the list of open iterators to be adjusted.

        Parameters:
        close - Iterator, will not be null

      • 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