Package db

Class ConstrainedForwardRecordIterator

java.lang.Object

db.ConstrainedForwardRecordIterator

All Implemented Interfaces:

RecordIterator

public class ConstrainedForwardRecordIterator
extends Object
implements RecordIterator

ConstrainedForwardRecordIterator provides the ability to both filter and translate records returned from an underlying RecordIterator.

Constructor Summary

Constructors

Constructor	Description
ConstrainedForwardRecordIterator(RecordIterator it, Function<DBRecord,DBRecord> recordPredicateAndTranslate)	Construct a constrained/filtered record iterator.

Method Summary

Modifier and Type	Method	Description
boolean	delete()	Delete the last Record read via the next or previous methods.
boolean	hasNext()	Return true if a Record is available in the forward direction.
boolean	hasPrevious()	Return true if a Record is available in the reverse direction
DBRecord	next()	Return the next Record or null if one is not available.
DBRecord	previous()	Return the previous Record or null if one is not available.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ConstrainedForwardRecordIterator

public ConstrainedForwardRecordIterator(RecordIterator it,
 Function<DBRecord,DBRecord> recordPredicateAndTranslate)

Construct a constrained/filtered record iterator.

Parameters:

it - source record iterator

recordPredicateAndTranslate - function which enables both filtering of records (null returned if record should be skipped) and the ability to translate the record to an alternate table/record schema.

Method Details

hasPrevious

public boolean hasPrevious()

Description copied from interface: RecordIterator

Return true if a Record is available in the reverse direction

Specified by:

hasPrevious in interface RecordIterator

previous

public DBRecord previous()

Description copied from interface: RecordIterator

Return the previous Record or null if one is not available.

Specified by:

previous in interface RecordIterator

delete

public boolean delete()
               throws IOException

Description copied from interface: RecordIterator

Delete the last Record read via the next or previous methods.

Specified by:

delete in interface RecordIterator

Returns:

true if record was successfully deleted.

Throws:

IOException - thrown if an IO error occurs.

hasNext

public boolean hasNext()
                throws IOException

Description copied from interface: RecordIterator

Return true if a Record is available in the forward direction.

Specified by:

hasNext in interface RecordIterator

Throws:

IOException - thrown if an IO error occurs

next

public DBRecord next()
              throws IOException

Description copied from interface: RecordIterator

Return the next Record or null if one is not available.

Specified by:

next in interface RecordIterator

Throws:

IOException - thrown if an IO error occurs