ListFeatureCollection (Geotools modules 21.0 API)

Object
- AbstractFeatureCollection
- - ListFeatureCollection

All Implemented Interfaces:

Iterable<SimpleFeature>, Collection<SimpleFeature>, SimpleFeatureCollection, FeatureCollection<SimpleFeatureType,SimpleFeature>
```
public class ListFeatureCollection
extends AbstractFeatureCollection
implements Collection<SimpleFeature>
```
FeatureCollection implementation wrapping around a java.util.List.
This implementation wraps around a java.util.List and is suitable for quickly getting something on screen.
Usage notes:
- This implementation does not use a spatial index, please do not expect spatial operations to be fast.
- FeatureCollections are not allowed to have duplicates
This implementation is intended to quickly wrap up a list of features and get them on screen; as such it respects various hints about the copying of internal content as provided by the renderer.
Author:

Oliver Gottwald, Jody

See Also:

Hints#FEATURE_DETACHED

Field Summary

Fields
Modifier and Type Field and Description

protected ReferencedEnvelope bounds
Cached bounds

protected List<SimpleFeature> list
wrapped list of features containing the contents
- Fields inherited from class AbstractFeatureCollection
  id, schema

Fields
Modifier and Type	Field and Description
`protected ReferencedEnvelope`	`bounds` Cached bounds
`protected List<SimpleFeature>`	`list` wrapped list of features containing the contents

Constructor Summary

Constructors
Constructor and Description
`ListFeatureCollection(SimpleFeatureCollection copy)` Create a ListFeatureCollection around the provided list.
`ListFeatureCollection(SimpleFeatureType schema)` Create a ListFeatureCollection for the provided schema An ArrayList is used internally.
`ListFeatureCollection(SimpleFeatureType schema, List<SimpleFeature> list)` Create a ListFeatureCollection around the provided list.
`ListFeatureCollection(SimpleFeatureType schema, SimpleFeature[] array)` Create a ListFeatureCollection around the provided array.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`add(SimpleFeature f)`
`boolean`	`addAll(Collection<? extends SimpleFeature> c)`
`protected ReferencedEnvelope`	`calculateBounds()` Calculate bounds from features
`void`	`clear()`
`SimpleFeatureIterator`	`features()` Obtain a SimpleFeatureIterator of the Features within this SimpleFeatureCollection.
`ReferencedEnvelope`	`getBounds()` Subclasses need to override this.
`boolean`	`isEmpty()` Returns `true` if this feature collection contains no features.
`protected Iterator<SimpleFeature>`	`openIterator()` Factory method used to open an iterator over collection contents for use by `AbstractFeatureCollection.iterator()` and `AbstractFeatureCollection.features()`.
`boolean`	`remove(Object o)`
`boolean`	`removeAll(Collection<?> c)`
`boolean`	`retainAll(Collection<?> c)`
`int`	`size()` Returns the number of elements in this collection.
`SimpleFeatureCollection`	`sort(SortBy order)` Obtained sorted contents.
`SimpleFeatureCollection`	`subCollection(Filter filter)` SimpleFeatureCollection "view" indicated by provided filter.

Methods inherited from class AbstractFeatureCollection
accepts, contains, containsAll, getID, getSchema, iterator, toArray, toArray

Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface Collection
contains, containsAll, equals, hashCode, iterator, parallelStream, removeIf, spliterator, stream, toArray, toArray

Methods inherited from interface Iterable
forEach

- Field Detail
  - list
```
protected List<SimpleFeature> list
```
    wrapped list of features containing the contents
  - bounds
```
protected ReferencedEnvelope bounds
```
    Cached bounds
- Constructor Detail
  - ListFeatureCollection
```
public ListFeatureCollection(SimpleFeatureType schema)
```
    Create a ListFeatureCollection for the provided schema An ArrayList is used internally.
    
    Parameters:
    
    schema -
  - ListFeatureCollection
```
public ListFeatureCollection(SimpleFeatureType schema,
                             List<SimpleFeature> list)
```
    Create a ListFeatureCollection around the provided list. The contents of the list should all be of the provided schema for this to make sense. Please keep in mind the feature collection constraints, no two Features in the list should have the same feature id, and you should not insert the same feature more then once.
    The provided list is directly used for storage, most feature collection operations just use a simple iterator so there is no performance advantaged to be gained over using an ArrayList vs a LinkedList (other then for the size() method of course).
    
    Parameters:
    
    schema -
    
    list -
  - ListFeatureCollection
```
public ListFeatureCollection(SimpleFeatureType schema,
                             SimpleFeature[] array)
```
    Create a ListFeatureCollection around the provided array. The contents of the array should all be of the provided schema for this to make sense. Please keep in mind the feature collection constraints, no two Features in the list should have the same feature id, and you should not insert the same feature more then once.
    The provided array is directly used with a CopyOnWriteArrayList for storage.
    
    Parameters:
    
    schema -
    
    list -
  - ListFeatureCollection
```
public ListFeatureCollection(SimpleFeatureCollection copy)
                      throws IOException
```
    Create a ListFeatureCollection around the provided list. The contents of the list should all be of the provided schema for this to make sense. Please keep in mind the feature collection control, no two Features in the list should have the same feature id, and you should not insert the same feature more then once.
    The provided list is directly used for storage, most feature collection operations just use a simple iterator so there is no performance advantaged to be gained over using an ArrayList vs a LinkedList (other then for the size() method of course).
    
    Parameters:
    
    schema -
    
    list -
    
    Throws:
    
    IOException
- Method Detail
  - size
```
public int size()
```
    Description copied from class: AbstractFeatureCollection
    
    Returns the number of elements in this collection.
    
    Specified by:
    
    size in interface Collection<SimpleFeature>
    
    Specified by:
    
    size in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
    
    Specified by:
    
    size in class AbstractFeatureCollection
    
    Returns:
    
    Number of items, or Interger.MAX_VALUE
    
    See Also:
    
    Collection.size()
  - openIterator
```
protected Iterator<SimpleFeature> openIterator()
```
    Description copied from class: AbstractFeatureCollection
    
    Factory method used to open an iterator over collection contents for use by AbstractFeatureCollection.iterator() and AbstractFeatureCollection.features().
    If you return an instance of FeatureIterator some effort is taken to call the FeatureIterator.close() internally, however we cannot offer any assurance that client code using AbstractFeatureCollection.iterator() will perform the same check.
    
    Specified by:
    
    openIterator in class AbstractFeatureCollection
    
    Returns:
    
    Iterator over collection contents
  - add
```
public boolean add(SimpleFeature f)
```
    Specified by:
    
    add in interface Collection<SimpleFeature>
  - clear
```
public void clear()
```
    Specified by:
    
    clear in interface Collection<SimpleFeature>
  - 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 SimpleFeatureCollection
    
    Specified by:
    
    features in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
    
    Overrides:
    
    features in class AbstractFeatureCollection
    
    Returns:
    
    A FeatureIterator.
  - getBounds
```
public ReferencedEnvelope getBounds()
```
    Description copied from class: AbstractFeatureCollection
    
    Subclasses need to override this.
    
    Specified by:
    
    getBounds in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
    
    Specified by:
    
    getBounds in class AbstractFeatureCollection
    
    Returns:
    
    An Envelope containing the total bounds of this collection.
  - calculateBounds
```
protected ReferencedEnvelope calculateBounds()
```
    Calculate bounds from features
    
    Returns:
  - isEmpty
```
public boolean isEmpty()
```
    Description copied from interface: FeatureCollection
    
    Returns true if this feature collection contains no features.
    
    Specified by:
    
    isEmpty in interface Collection<SimpleFeature>
    
    Specified by:
    
    isEmpty in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
    
    Overrides:
    
    isEmpty in class AbstractFeatureCollection
    
    Returns:
    
    true if this collection contains no elements.
  - 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 SimpleFeatureCollection
    
    Specified by:
    
    subCollection in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
    
    Overrides:
    
    subCollection in class AbstractFeatureCollection
    
    Returns:
    
    SimpleFeatureCollection identified as subset.
    
    See Also:
    
    FeatureList
  - sort
```
public SimpleFeatureCollection 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 interface SimpleFeatureCollection
    
    Specified by:
    
    sort in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
    
    Overrides:
    
    sort in class AbstractFeatureCollection
    
    Parameters:
    
    order - Sort order
    
    Returns:
    
    FeatureCollection sorted in the indicated order
  - remove
```
public boolean remove(Object o)
```
    Specified by:
    
    remove in interface Collection<SimpleFeature>
  - addAll
```
public boolean addAll(Collection<? extends SimpleFeature> c)
```
    Specified by:
    
    addAll in interface Collection<SimpleFeature>
  - removeAll
```
public boolean removeAll(Collection<?> c)
```
    Specified by:
    
    removeAll in interface Collection<SimpleFeature>
  - retainAll
```
public boolean retainAll(Collection<?> c)
```
    Specified by:
    
    retainAll in interface Collection<SimpleFeature>

Class ListFeatureCollection

Field Summary

Fields inherited from class AbstractFeatureCollection

Constructor Summary

Method Summary

Methods inherited from class AbstractFeatureCollection

Methods inherited from class Object

Methods inherited from interface Collection

Methods inherited from interface Iterable

Field Detail

list

bounds

Constructor Detail

ListFeatureCollection

ListFeatureCollection

ListFeatureCollection

ListFeatureCollection

Method Detail

size

openIterator

add

clear

features

getBounds

calculateBounds

isEmpty

subCollection

sort

remove

addAll

removeAll

retainAll