Class MaxFeaturesFeatureCollection<T extends FeatureType,F extends Feature>
- Object
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- DecoratingFeatureCollection<T,F>
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- MaxFeaturesFeatureCollection<T,F>
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- All Implemented Interfaces:
FeatureCollection<T,F>
public class MaxFeaturesFeatureCollection<T extends FeatureType,F extends Feature> extends DecoratingFeatureCollection<T,F>
SimpleFeatureCollection wrapper which limits the number of features returned.- Author:
- Justin Deoliveira, The Open Planning Project
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Constructor Summary
Constructors Constructor Description MaxFeaturesFeatureCollection(FeatureCollection<T,F> delegate, long max)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
containsAll(Collection<?> c)
FeatureIterator<F>
features()
Obtain a FeatureIteratorof the Features within this FeatureCollection. ReferencedEnvelope
getBounds()
Get the total bounds of this collection which is calculated by doing a union of the bounds of each feature inside of itboolean
isEmpty()
Returns true if this feature collection contains no features.FeatureReader<T,F>
reader()
int
size()
Please note this operation may be expensive when working with remote content.FeatureCollection<T,F>
sort(SortBy order)
Obtained sorted contents.FeatureCollection<T,F>
subCollection(Filter filter)
SimpleFeatureCollection "view" indicated by provided filter.Object[]
toArray()
<O> O[]
toArray(O[] a)
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Methods inherited from class DecoratingFeatureCollection
accepts, canDelegate, contains, equals, getID, getSchema, hashCode
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Constructor Detail
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MaxFeaturesFeatureCollection
public MaxFeaturesFeatureCollection(FeatureCollection<T,F> delegate, long max)
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Method Detail
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reader
public FeatureReader<T,F> reader() throws IOException
- Throws:
IOException
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features
public FeatureIterator<F> features()
Description copied from interface:FeatureCollection
Obtain a FeatureIteratorof the Features within this FeatureCollection. The implementation of FeatureIterator must adhere to the rules of fail-fast concurrent modification. In addition (to allow for resource backed collections) the
FeatureIterator.close()
method must be called.Example use:
FeatureIterator
iterator=collection.features(); try { while( iterator.hasNext() ){ Feature feature = iterator.next(); System.out.println( feature.getID() ); } } finally { iterator.close(); } GML Note: The contents of this iterator are considered to be defined by featureMember tags (and/or the single allowed FeatureMembers tag). Please see getFeatureType for more details.
- Specified by:
features
in interfaceFeatureCollection<T extends FeatureType,F extends Feature>
- Overrides:
features
in classDecoratingFeatureCollection<T extends FeatureType,F extends Feature>
- Returns:
- A FeatureIterator.
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subCollection
public FeatureCollection<T,F> 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:
The above recommended use is agreement with the Collections API precident of List.subList( start, end ).collection.subCollection( filter ).clear();
The results of subCollection:
- are to be considered unordered
- may be an ordered FeatureList if requested when sortBy is indicated
- Specified by:
subCollection
in interfaceFeatureCollection<T extends FeatureType,F extends Feature>
- Overrides:
subCollection
in classDecoratingFeatureCollection<T extends FeatureType,F extends Feature>
- Returns:
- SimpleFeatureCollection identified as subset.
- See Also:
FeatureList
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sort
public FeatureCollection<T,F> sort(SortBy order)
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 interfaceFeatureCollection<T extends FeatureType,F extends Feature>
- Overrides:
sort
in classDecoratingFeatureCollection<T extends FeatureType,F extends Feature>
- Parameters:
order
- Sort order- Returns:
- FeatureCollection sorted in the indicated order
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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 interfaceFeatureCollection<T extends FeatureType,F extends Feature>
- Overrides:
size
in classDecoratingFeatureCollection<T extends FeatureType,F extends Feature>
- See Also:
Collection.size()
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isEmpty
public boolean isEmpty()
Description copied from interface:FeatureCollection
Returns true if this feature collection contains no features.- Specified by:
isEmpty
in interfaceFeatureCollection<T extends FeatureType,F extends Feature>
- Overrides:
isEmpty
in classDecoratingFeatureCollection<T extends FeatureType,F extends Feature>
- Returns:
- true if this collection contains no features
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toArray
public Object[] toArray()
- Specified by:
toArray
in interfaceFeatureCollection<T extends FeatureType,F extends Feature>
- Overrides:
toArray
in classDecoratingFeatureCollection<T extends FeatureType,F extends Feature>
- See Also:
Collection.toArray()
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toArray
public <O> O[] toArray(O[] a)
- Specified by:
toArray
in interfaceFeatureCollection<T extends FeatureType,F extends Feature>
- Overrides:
toArray
in classDecoratingFeatureCollection<T extends FeatureType,F extends Feature>
- See Also:
Collection.toArray(Object[])
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containsAll
public boolean containsAll(Collection<?> c)
- Specified by:
containsAll
in interfaceFeatureCollection<T extends FeatureType,F extends Feature>
- Overrides:
containsAll
in classDecoratingFeatureCollection<T extends FeatureType,F extends Feature>
- See Also:
Collection.containsAll(Collection)
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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 interfaceFeatureCollection<T extends FeatureType,F extends Feature>
- Overrides:
getBounds
in classDecoratingFeatureCollection<T extends FeatureType,F extends Feature>
- Returns:
- An Envelope containing the total bounds of this collection.
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