SortBufferScan (Apache Derby V10.14 Internals)

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java.lang.Object
- org.apache.derby.impl.store.access.sort.Scan
- - org.apache.derby.impl.store.access.sort.SortScan
  - - org.apache.derby.impl.store.access.sort.SortBufferScan

All Implemented Interfaces:

ScanManager, GenericScanController, GroupFetchScanController, RowCountable, ScanController, ScanInfo
```
public class SortBufferScan
extends SortScan
```
A sort scan that just reads rows out of a sorter.

Field Summary

Fields
Modifier and Type Field Description

protected SortBuffer sortBuffer
The sorter we're returning rows from.
- Fields inherited from interface org.apache.derby.iapi.store.access.ScanController
  GE, GT, NA
- Fields inherited from class org.apache.derby.impl.store.access.sort.SortScan
  current, hold, sort, tran

Constructor Summary

Constructors
Constructor Description

SortBufferScan(MergeSort sort, TransactionManager tran, SortBuffer sortBuffer, boolean hold)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`	Close the scan.
`boolean`	`closeForEndTransaction(boolean closeHeldScan)`	Close the scan.
`boolean`	`next()`	Move to the next position in the scan.

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

Methods inherited from class org.apache.derby.impl.store.access.sort.Scan
delete, didNotQualify, doesCurrentPositionQualify, fetchLocation, fetchNextGroup, fetchNextGroup, fetchSet, getAllScanInfo, getEstimatedRowCount, getScanInfo, isCurrentPositionDeleted, isHeldAfterCommit, isKeyed, isTableLocked, newRowLocationTemplate, positionAtRowLocation, reopenScan, reopenScanByRowLocation, replace, setEstimatedRowCount

Methods inherited from class org.apache.derby.impl.store.access.sort.SortScan
fetch, fetchNext, fetchWithoutQualify

- Field Detail
  - sortBuffer
```
protected SortBuffer sortBuffer
```
    The sorter we're returning rows from.
- Constructor Detail
  - SortBufferScan
```
SortBufferScan(MergeSort sort,
               TransactionManager tran,
               SortBuffer sortBuffer,
               boolean hold)
```
- Method Detail
  - next
```
public boolean next()
             throws StandardException
```
    Move to the next position in the scan.
    
    Returns:
    
    True if there is a next position in the scan, false if there isn't.
    
    Throws:
    
    StandardException - Standard exception policy.
    
    See Also:
    
    ScanController.next()
  - closeForEndTransaction
```
public boolean closeForEndTransaction(boolean closeHeldScan)
```
    Close the scan.
    
    Parameters:
    
    closeHeldScan - If true, means to close scan even if it has been opened to be kept opened across commit. This is used to close these scans on abort.
    
    Returns:
    
    boolean indicating that the close has resulted in a real close of the scan. A held scan will return false if called by closeForEndTransaction(false), otherwise it will return true. A non-held scan will always return true.
  - close
```
public void close()
```
    Close the scan.
    
    Specified by:
    
    close in interface GenericScanController
    
    Overrides:
    
    close in class SortScan
    
    See Also:
    
    GenericScanController.close()

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Built on Wed 2018-05-16 16:01:03+0000, from revision ???

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Apache Derby V10.14 Internals - Copyright © 2004,2018 The Apache Software Foundation. All Rights Reserved.