Object
- DiffFeatureReader<T,F>

All Implemented Interfaces:

Closeable, AutoCloseable, FeatureReader<T,F>
```
public class DiffFeatureReader<T extends FeatureType,F extends Feature>
extends Object
implements FeatureReader<T,F>
```
A FeatureReader that considers differences.
Used to implement In-Process Transaction support. This implementation will need to peek ahead in order to check for deletetions.

Author:

Jody Garnett, Refractions Research

Constructor Summary

Constructors
Constructor	Description
`DiffFeatureReader(FeatureReader<T,F> reader, Diff diff2)`	This constructor grabs a "copy" of the current diff.
`DiffFeatureReader(FeatureReader<T,F> reader, Diff diff2, Filter filter)`	This constructor grabs a "copy" of the current diff.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`	Release the underlying resources associated with this stream.
`protected Envelope`	`extractBboxForSpatialIndexQuery(BinarySpatialOperator filter)`
`T`	`getFeatureType()`	Return the FeatureType this reader has been configured to create.
`protected List`	`getIndexedFeatures()`
`boolean`	`hasNext()`	Query whether this FeatureReader has another Feature.
`protected boolean`	`isDefaultGeometry(PropertyName ae)`
`protected boolean`	`isSubsetOfBboxFilter(Filter f)`
`F`	`next()`	Reads the next Feature in the FeatureReader.
`protected void`	`queryAdded()`
`protected void`	`queryDiff()`
`protected void`	`queryFidFilter()`
`protected void`	`queryModified()`
`protected void`	`querySpatialIndex()`

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

- Constructor Detail
  - DiffFeatureReader
```
public DiffFeatureReader(FeatureReader<T,F> reader,
                         Diff diff2)
```
    This constructor grabs a "copy" of the current diff.
    This reader is not "live" to changes over the course of the Transaction. (Iterators are not always stable of the course of modifications)
    
    Parameters:
    
    diff2 - Differences of Feature by FID
  - DiffFeatureReader
```
public DiffFeatureReader(FeatureReader<T,F> reader,
                         Diff diff2,
                         Filter filter)
```
    This constructor grabs a "copy" of the current diff.
    This reader is not "live" to changes over the course of the Transaction. (Iterators are not always stable of the course of modifications)
    
    Parameters:
    
    diff2 - Differences of Feature by FID
- Method Detail
  - getFeatureType
```
public T getFeatureType()
```
    Description copied from interface: FeatureReader
    
    Return the FeatureType this reader has been configured to create.
    
    Specified by:
    
    getFeatureType in interface FeatureReader<T extends FeatureType,F extends Feature>
    
    Returns:
    
    the FeatureType of the Features this FeatureReader will create.
    
    See Also:
    
    FeatureReader.getFeatureType()
  - next
```
public F next()
       throws IOException,
              IllegalAttributeException,
              NoSuchElementException
```
    Description copied from interface: FeatureReader
    
    Reads the next Feature in the FeatureReader.
    
    Specified by:
    
    next in interface FeatureReader<T extends FeatureType,F extends Feature>
    
    Returns:
    
    The next feature in the reader.
    
    Throws:
    
    IOException - If an error occurs reading the Feature.
    
    NoSuchElementException - If there are no more Features in the Reader.
    
    IllegalAttributeException
    
    See Also:
    
    FeatureReader.next()
  - hasNext
```
public boolean hasNext()
                throws IOException
```
    Description copied from interface: FeatureReader
    
    Query whether this FeatureReader has another Feature.
    
    Specified by:
    
    hasNext in interface FeatureReader<T extends FeatureType,F extends Feature>
    
    Returns:
    
    True if there are more Features to be read. In other words, true if calls to next would return a feature rather than throwing an exception.
    
    Throws:
    
    IOException - If an error occurs determining if there are more Features.
    
    See Also:
    
    FeatureReader.hasNext()
  - close
```
public void close()
           throws IOException
```
    Description copied from interface: FeatureReader
    
    Release the underlying resources associated with this stream.
    
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface FeatureReader<T extends FeatureType,F extends Feature>
    
    Throws:
    
    IOException - if an I/O error occurs
    
    See Also:
    
    FeatureReader.close()
  - queryDiff
```
protected void queryDiff()
```
  - querySpatialIndex
```
protected void querySpatialIndex()
```
  - queryAdded
```
protected void queryAdded()
```
  - queryModified
```
protected void queryModified()
```
  - queryFidFilter
```
protected void queryFidFilter()
```
  - getIndexedFeatures
```
protected List getIndexedFeatures()
```
  - extractBboxForSpatialIndexQuery
```
protected Envelope extractBboxForSpatialIndexQuery(BinarySpatialOperator filter)
```
  - isDefaultGeometry
```
protected boolean isDefaultGeometry(PropertyName ae)
```
  - isSubsetOfBboxFilter
```
protected boolean isSubsetOfBboxFilter(Filter f)
```

Class DiffFeatureReader<T extends FeatureType,​F extends Feature>

Constructor Summary

Method Summary

Methods inherited from class Object

Constructor Detail

DiffFeatureReader

DiffFeatureReader

Method Detail

getFeatureType

next

hasNext

close

queryDiff

querySpatialIndex

queryAdded

queryModified

queryFidFilter

getIndexedFeatures

extractBboxForSpatialIndexQuery

isDefaultGeometry

isSubsetOfBboxFilter

Class DiffFeatureReader<T extends FeatureType,F extends Feature>