Top Description Fields Constructors Methods
org.apache.derby.impl.store.access.btree.index

public Class B2IMaxScan

extends BTreeMaxScan
Class Inheritance
Imports
org.apache.derby.shared.common.sanity.SanityManager, org.apache.derby.shared.common.error.StandardException, org.apache.derby.iapi.store.access.conglomerate.TransactionManager, org.apache.derby.iapi.store.access.ConglomerateController, .DynamicCompiledOpenConglomInfo, .Qualifier, .ScanController, .StaticCompiledOpenConglomInfo, .TransactionController, .GenericScanController, org.apache.derby.iapi.store.raw.LockingPolicy, .Transaction, org.apache.derby.iapi.types.DataValueDescriptor, org.apache.derby.iapi.services.io.FormatableBitSet, org.apache.derby.impl.store.access.btree.BTreeLockingPolicy, .BTreeMaxScan
Scan used to find maximum value in the secondary index. This class implements an optimized interface to find the maximum row, for a set of rows between an input start and stop key. Note most work of this class is inherited from the generic btree implementation. This class initializes the top level object and deals with locking information specific to a secondary index implementation of a btree.

Field Summary

Modifier and TypeField and Description
private ConglomerateController
base_cc_for_locking

Constructor Summary

AccessConstructor and Description
pack-priv
B2IMaxScan()

Method Summary

Modifier and TypeMethod and Description
public void
close()

Overrides org.apache.derby.impl.store.access.btree.BTreeScan.close.

Implements org.apache.derby.iapi.store.access.GenericScanController.close.

Close the scan.

public boolean
closeForEndTransaction(boolean
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.
closeHeldScan)

Overrides org.apache.derby.impl.store.access.btree.BTreeScan.closeForEndTransaction.

Implements org.apache.derby.iapi.store.access.conglomerate.ScanManager.closeForEndTransaction.

Close the scan, a commit or abort is about to happen.

public void
init(TransactionManager xact_manager, Transaction rawtran, int open_mode, int lock_level, LockingPolicy locking_policy, int isolation_level, boolean open_for_locking, FormatableBitSet scanColumnList, B2I conglomerate, B2IUndo undo)

Initialize the scan for use.

Inherited from org.apache.derby.impl.store.access.btree.BTreeMaxScan:
fetchMaxfetchRowspositionAtStartPosition

Field Detail

base_cc_for_lockingback to summary
private ConglomerateController base_cc_for_locking

Constructor Detail

B2IMaxScanback to summary
pack-priv B2IMaxScan()

Method Detail

closeback to summary
public void close() throws StandardException

Overrides org.apache.derby.impl.store.access.btree.BTreeScan.close.

Implements org.apache.derby.iapi.store.access.GenericScanController.close.

Close the scan.

Exceptions
StandardException:

Doc from org.apache.derby.iapi.store.access.GenericScanController.close.

Standard exception policy.

See Also
GenericScanController#newRowLocationTemplate
closeForEndTransactionback to summary
public boolean closeForEndTransaction(boolean closeHeldScan) throws StandardException

Overrides org.apache.derby.impl.store.access.btree.BTreeScan.closeForEndTransaction.

Implements org.apache.derby.iapi.store.access.conglomerate.ScanManager.closeForEndTransaction.

Close the scan, a commit or abort is about to happen.

Parameters
closeHeldScan:boolean

Doc from org.apache.derby.iapi.store.access.conglomerate.ScanManager.closeForEndTransaction.

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

Doc from org.apache.derby.iapi.store.access.conglomerate.ScanManager.closeForEndTransaction.

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.

Exceptions
StandardException:

Doc from org.apache.derby.iapi.store.access.conglomerate.ScanManager.closeForEndTransaction.

Standard exception policy.

initback to summary
public void init(TransactionManager xact_manager, Transaction rawtran, int open_mode, int lock_level, LockingPolicy locking_policy, int isolation_level, boolean open_for_locking, FormatableBitSet scanColumnList, B2I conglomerate, B2IUndo undo) throws StandardException

Initialize the scan for use.

Any changes to this method may have to be reflected in close as well.

The btree init opens the container (super.init), and stores away the state of the qualifiers. The actual searching for the first position is delayed until the first next() call.

Exceptions
StandardException:
Standard exception policy.