AdaptorFeatureCollection (Geotools modules 21.0 API)

Object
- AdaptorFeatureCollection

All Implemented Interfaces:

SimpleFeatureCollection, FeatureCollection<SimpleFeatureType,SimpleFeature>
```
public abstract class AdaptorFeatureCollection
extends Object
implements SimpleFeatureCollection
```
Implement a feature collection just based on provision of iterator.
You will need to implement the following methods:
Author:

Jody Garnett (LISAsoft)

Field Summary

Fields
Modifier and Type Field and Description

protected String id
id used when serialized to gml

protected SimpleFeatureType schema

Fields
Modifier and Type	Field and Description
`protected String`	`id` id used when serialized to gml
`protected SimpleFeatureType`	`schema`

Constructor Summary

Constructors
Constructor and Description

AdaptorFeatureCollection(String id, SimpleFeatureType memberType)

Constructors
Constructor and Description
`AdaptorFeatureCollection(String id, SimpleFeatureType memberType)`

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`accepts(FeatureVisitor visitor, ProgressListener progress)` Accepts a visitor, which then visits each feature in the collection.
`void`	`close(FeatureIterator<SimpleFeature> close)`
`void`	`close(Iterator close)` Clean up after any resources assocaited with this iteartor in a manner similar to JDO collections.
`void`	`close(SimpleFeatureIterator close)`
`protected abstract void`	`closeIterator(Iterator<SimpleFeature> close)` Please override to cleanup after your own iterators, and any used resources.
`void`	`closeIterator(SimpleFeatureIterator close)`
`boolean`	`contains(Object o)` Returns `true` if this collection contains the specified element.
`boolean`	`containsAll(Collection c)` Returns `true` if this collection contains all of the elements in the specified collection.
`SimpleFeatureIterator`	`features()` Obtain a SimpleFeatureIterator of the Features within this SimpleFeatureCollection.
`ReferencedEnvelope`	`getBounds()` Subclasses need to override this.
`String`	`getID()` ID used when serializing to GML
`SimpleFeatureType`	`getSchema()` The schema for the child feature members of this collection.
`boolean`	`isEmpty()` Returns `true` if this feature collection contains no features.
`Iterator<SimpleFeature>`	`iterator()` Please implement!
`protected abstract Iterator<SimpleFeature>`	`openIterator()` Open an Iterator, we will call close( iterator ).
`abstract 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.
`SimpleFeatureCollection`	`subList(Filter filter)`
`Object[]`	`toArray()` Array of all the elements.
`Object[]`	`toArray(Object[] a)`
`String`	`toString()` Returns a string representation of this collection.

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

- Field Detail
  - id
```
protected String id
```
    id used when serialized to gml
  - schema
```
protected SimpleFeatureType schema
```
- Constructor Detail
  - AdaptorFeatureCollection
```
public AdaptorFeatureCollection(String id,
                                SimpleFeatureType memberType)
```
- 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 SimpleFeatureCollection
    
    Specified by:
    
    features in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
    
    Returns:
    
    A FeatureIterator.
  - close
```
public void close(FeatureIterator<SimpleFeature> close)
```
  - close
```
public void close(SimpleFeatureIterator close)
```
  - closeIterator
```
public void closeIterator(SimpleFeatureIterator close)
```
  - accepts
```
public void accepts(FeatureVisitor visitor,
                    ProgressListener progress)
             throws IOException
```
    Accepts a visitor, which then visits each feature in the collection.
    
    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
  - subList
```
public SimpleFeatureCollection subList(Filter filter)
```
  - 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>
    
    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>
    
    Parameters:
    
    order - Sort order
    
    Returns:
    
    FeatureCollection sorted in the indicated order
  - 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 elements.
  - 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)
  - 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:
    
    Collection.toArray()
  - toArray
```
public Object[] toArray(Object[] a)
```
    Specified by:
    
    toArray in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
    
    See Also:
    
    Collection.toArray(Object[])
  - 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:
    
    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.
  - size
```
public abstract int size()
```
    Returns the number of elements in this collection.
    
    Specified by:
    
    size in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
    
    Returns:
    
    Number of items, or Interger.MAX_VALUE
    
    See Also:
    
    Collection.size()
  - close
```
public final void close(Iterator 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 );
 }
 
```
    Parameters:
    
    close -
  - 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
  - getID
```
public String getID()
```
    Description copied from interface: FeatureCollection
    
    ID used when serializing to GML
    
    Specified by:
    
    getID in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
  - 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
  - getBounds
```
public ReferencedEnvelope getBounds()
```
    Subclasses need to override this.
    
    Specified by:
    
    getBounds in interface FeatureCollection<SimpleFeatureType,SimpleFeature>
    
    Returns:
    
    An Envelope containing the total bounds of this collection.

Class AdaptorFeatureCollection

Field Summary

Constructor Summary

Method Summary

Methods inherited from class Object

Field Detail

id

schema

Constructor Detail

AdaptorFeatureCollection

Method Detail

features

close

close

closeIterator

accepts

subList

subCollection

sort

isEmpty

contains

toArray

toArray

containsAll

toString

iterator

size

close

openIterator

closeIterator

getID

getSchema

getBounds