java.lang.Object
- org.apache.cassandra.utils.AbstractIterator<Unfiltered>
- - org.apache.cassandra.db.rows.LazilyInitializedUnfilteredRowIterator

All Implemented Interfaces:

com.google.common.collect.PeekingIterator<Unfiltered>, java.lang.AutoCloseable, java.util.Iterator<Unfiltered>, BaseRowIterator<Unfiltered>, UnfilteredRowIterator, CloseableIterator<Unfiltered>

Direct Known Subclasses:

UnfilteredRowIteratorWithLowerBound
```
public abstract class LazilyInitializedUnfilteredRowIterator
extends AbstractIterator<Unfiltered>
implements UnfilteredRowIterator
```
Abstract class to create UnfilteredRowIterator that lazily initialize themselves. This is used during partition range queries when we know the partition key but want to defer the initialization of the rest of the UnfilteredRowIterator until we need those informations. See BigTableScanner.KeyScanningIterator for instance.

Constructor Summary

Constructors
Constructor Description

LazilyInitializedUnfilteredRowIterator(DecoratedKey partitionKey)

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`close()`
`RegularAndStaticColumns`	`columns()`	A subset of the columns for the (static and regular) rows returned by this iterator.
`protected Unfiltered`	`computeNext()`
`boolean`	`initialized()`
`protected abstract UnfilteredRowIterator`	`initializeIterator()`
`boolean`	`isReverseOrder()`	Whether or not the rows returned by this iterator are in reversed clustering order.
`protected void`	`maybeInit()`
`TableMetadata`	`metadata()`	The metadata for the table this iterator on.
`DecoratedKey`	`partitionKey()`	The partition key of the partition this in an iterator over.
`DeletionTime`	`partitionLevelDeletion()`	The partition level deletion for the partition this iterate over.
`Row`	`staticRow()`	The static part corresponding to this partition (this can be an empty row but cannot be `null`).
`EncodingStats`	`stats()`	Return "statistics" about what is returned by this iterator.

Methods inherited from class org.apache.cassandra.utils.AbstractIterator
endOfData, hasNext, next, peek, remove

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

Methods inherited from interface java.util.Iterator
forEachRemaining, hasNext

Methods inherited from interface org.apache.cassandra.db.rows.UnfilteredRowIterator
isEmpty

- Constructor Detail
  - LazilyInitializedUnfilteredRowIterator
```
public LazilyInitializedUnfilteredRowIterator(DecoratedKey partitionKey)
```
- Method Detail
  - initializeIterator
```
protected abstract UnfilteredRowIterator initializeIterator()
```
  - maybeInit
```
protected void maybeInit()
```
  - initialized
```
public boolean initialized()
```
  - metadata
```
public TableMetadata metadata()
```
    Description copied from interface: BaseRowIterator
    
    The metadata for the table this iterator on.
    
    Specified by:
    
    metadata in interface BaseRowIterator<Unfiltered>
  - columns
```
public RegularAndStaticColumns columns()
```
    Description copied from interface: BaseRowIterator
    
    A subset of the columns for the (static and regular) rows returned by this iterator. Every row returned by this iterator must guarantee that it has only those columns.
    
    Specified by:
    
    columns in interface BaseRowIterator<Unfiltered>
  - isReverseOrder
```
public boolean isReverseOrder()
```
    Description copied from interface: BaseRowIterator
    
    Whether or not the rows returned by this iterator are in reversed clustering order.
    
    Specified by:
    
    isReverseOrder in interface BaseRowIterator<Unfiltered>
  - partitionKey
```
public DecoratedKey partitionKey()
```
    Description copied from interface: BaseRowIterator
    
    The partition key of the partition this in an iterator over.
    
    Specified by:
    
    partitionKey in interface BaseRowIterator<Unfiltered>
  - partitionLevelDeletion
```
public DeletionTime partitionLevelDeletion()
```
    Description copied from interface: UnfilteredRowIterator
    
    The partition level deletion for the partition this iterate over.
    
    Specified by:
    
    partitionLevelDeletion in interface UnfilteredRowIterator
  - staticRow
```
public Row staticRow()
```
    Description copied from interface: BaseRowIterator
    
    The static part corresponding to this partition (this can be an empty row but cannot be null).
    
    Specified by:
    
    staticRow in interface BaseRowIterator<Unfiltered>
  - stats
```
public EncodingStats stats()
```
    Description copied from interface: UnfilteredRowIterator
    
    Return "statistics" about what is returned by this iterator. Those are used for performance reasons (for delta-encoding for instance) and code should not expect those to be exact.
    
    Specified by:
    
    stats in interface UnfilteredRowIterator
  - computeNext
```
protected Unfiltered computeNext()
```
    Specified by:
    
    computeNext in class AbstractIterator<Unfiltered>
  - close
```
public void close()
```
    Specified by:
    
    close in interface java.lang.AutoCloseable
    
    Specified by:
    
    close in interface CloseableIterator<Unfiltered>
    
    Overrides:
    
    close in class AbstractIterator<Unfiltered>

Class LazilyInitializedUnfilteredRowIterator

Constructor Summary

Method Summary

Methods inherited from class org.apache.cassandra.utils.AbstractIterator

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Iterator

Methods inherited from interface org.apache.cassandra.db.rows.UnfilteredRowIterator

Constructor Detail

LazilyInitializedUnfilteredRowIterator

Method Detail

initializeIterator

maybeInit

initialized

metadata

columns

isReverseOrder

partitionKey

partitionLevelDeletion

staticRow

stats

computeNext

close