Object
- FilteringFeatureWriter

All Implemented Interfaces:

Closeable, AutoCloseable, FeatureWriter<SimpleFeatureType,SimpleFeature>
```
public class FilteringFeatureWriter
extends Object
implements FeatureWriter<SimpleFeatureType,SimpleFeature>
```
Filtering is performed on this hasNext() method.
This implementation writes out content furing the hasNext() method. This allows the implementation to "peek" ahead.
This FeatureWriter does not support the addition of new content.

Author:

Jody Garnett, Refractions Research

Constructor Summary

Constructors
Constructor Description

FilteringFeatureWriter(FeatureWriter<SimpleFeatureType,SimpleFeature> writer, Filter filter)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`	Release the underlying resources.
`SimpleFeatureType`	`getFeatureType()`	FeatureType this reader has been configured to create.
`boolean`	`hasNext()`	Query if we have more content.
`SimpleFeature`	`next()`	Reads a Feature from the underlying AttributeReader.
`void`	`remove()`	Removes current Feature, must be called before hasNext.
`void`	`write()`	Writes the current Feature, must be called before hasNext.

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

- Constructor Detail
  - FilteringFeatureWriter
```
public FilteringFeatureWriter(FeatureWriter<SimpleFeatureType,SimpleFeature> writer,
                              Filter filter)
```
- Method Detail
  - getFeatureType
```
public SimpleFeatureType getFeatureType()
```
    Description copied from interface: FeatureWriter
    
    FeatureType this reader has been configured to create.
    
    Specified by:
    
    getFeatureType in interface FeatureWriter<SimpleFeatureType,SimpleFeature>
    
    Returns:
    
    FeatureType this writer has been configured to create.
  - next
```
public SimpleFeature next()
                   throws IOException
```
    Description copied from interface: FeatureWriter
    
    Reads a Feature from the underlying AttributeReader.
    This method may return a Feature even though hasNext() returns false, this allows FeatureWriters to provide an ability to append content.
    
    Specified by:
    
    next in interface FeatureWriter<SimpleFeatureType,SimpleFeature>
    
    Returns:
    
    Feature from Query, or newly appended Feature
    
    Throws:
    
    IOException - if the writer has been closed or an I/O error occurs reading the next Feature.
  - remove
```
public void remove()
            throws IOException
```
    Description copied from interface: FeatureWriter
    
    Removes current Feature, must be called before hasNext.
    FeatureWriters will need to allow all FeatureSources of the same typeName to issue a FeatureEvent event of type FeatureEvent.FEATURES_REMOVED when this method is called.
    If this FeatureWriter is opperating against a Transaction FEATURES_REMOVED events should only be sent to FeatureSources operating on the same Transaction. When Transaction commit() is called other FeatureSources will be informed of the modifications.
    When the current Feature has been provided as new content, this method "cancels" the add opperation (and notification needed).
    
    Specified by:
    
    remove in interface FeatureWriter<SimpleFeatureType,SimpleFeature>
    
    Throws:
    
    IOException
  - write
```
public void write()
           throws IOException
```
    Description copied from interface: FeatureWriter
    Writes the current Feature, must be called before hasNext.
    FeautreWriters will need to allow FeatureSources of the same typeName to issue a FeatureEvent:
    
    FeatureEvent.FEATURES_ADDED: when next() has been called with hasNext() equal to false.
    FeatureEvent.FEATURES_MODIFIED: when next has been called with hasNext() equal to true and the resulting Feature has indeed been modified.
    
    If this FeatureWriter is opperating against a Transaction the FEATURES_MODIFIED or FEATURES_ADDED events should only be sent to FeatureSources opperating on the same Transaction. When Transaction commit() is called other FeatureSources will be informed of the modifications.
    If you have not called write() when you call hasNext() or next(), no modification will occur().
    Specified by:
    
    write in interface FeatureWriter<SimpleFeatureType,SimpleFeature>
    
    Throws:
    
    IOException
  - hasNext
```
public boolean hasNext()
                throws IOException
```
    Query if we have more content.
    
    Specified by:
    
    hasNext in interface FeatureWriter<SimpleFeatureType,SimpleFeature>
    
    Returns:
    
    true if writer has additional content
    
    Throws:
    
    IOException - If writer we are filtering encounters a problem
  - close
```
public void close()
           throws IOException
```
    Description copied from interface: FeatureWriter
    
    Release the underlying resources.
    
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface FeatureWriter<SimpleFeatureType,SimpleFeature>
    
    Throws:
    
    IOException - if there there are problems releasing underlying resources, or possibly if close has been called (up to the implementation).

Class FilteringFeatureWriter

Constructor Summary

Method Summary

Methods inherited from class Object

Constructor Detail

FilteringFeatureWriter

Method Detail

getFeatureType

next

remove

write

hasNext

close