ScannerModel (Hortonworks Data Platform Apache HBase Java API Reference)

java.lang.Object
- org.apache.hadoop.hbase.rest.model.ScannerModel

All Implemented Interfaces:: Serializable, ProtobufMessageHandler

@InterfaceAudience.Private
public class ScannerModel
extends Object
implements ProtobufMessageHandler, Serializable

A representation of Scanner parameters.

 <complexType name="Scanner">
   <sequence>
     <element name="column" type="base64Binary" minOccurs="0" maxOccurs="unbounded"/>
     <element name="filter" type="string" minOccurs="0" maxOccurs="1"></element>
   </sequence>
   <attribute name="startRow" type="base64Binary"></attribute>
   <attribute name="endRow" type="base64Binary"></attribute>
   <attribute name="batch" type="int"></attribute>
   <attribute name="caching" type="int"></attribute>
   <attribute name="startTime" type="int"></attribute>
   <attribute name="endTime" type="int"></attribute>
   <attribute name="maxVersions" type="int"></attribute>
 </complexType>

See Also:: Serialized Form

Constructor Summary

Constructors
Constructor and Description
`ScannerModel()` Default constructor
`ScannerModel(byte[] startRow, byte[] endRow, List<byte[]> columns, int batch, int caching, long endTime, int maxVersions, String filter)` Constructor
`ScannerModel(byte[] startRow, byte[] endRow, List<byte[]> columns, int batch, int caching, long startTime, long endTime, String filter)` Constructor

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`addColumn(byte[] column)` Add a column to the column set
`void`	`addLabel(String label)` Add a visibility label to the scan
`static Filter`	`buildFilter(String s)`
`byte[]`	`createProtobufOutput()`
`static ScannerModel`	`fromScan(Scan scan)`
`int`	`getBatch()`
`boolean`	`getCacheBlocks()`
`int`	`getCaching()`
`List<byte[]>`	`getColumns()`
`byte[]`	`getEndRow()`
`long`	`getEndTime()`
`String`	`getFilter()`
`List<String>`	`getLabels()`
`int`	`getMaxVersions()`
`ProtobufMessageHandler`	`getObjectFromMessage(byte[] message)` Initialize the model from a protobuf representation.
`byte[]`	`getStartRow()`
`long`	`getStartTime()`
`boolean`	`hasEndRow()`
`boolean`	`hasStartRow()`
`void`	`setBatch(int batch)`
`void`	`setCacheBlocks(boolean value)`
`void`	`setCaching(int caching)`
`void`	`setColumns(List<byte[]> columns)`
`void`	`setEndRow(byte[] endRow)`
`void`	`setEndTime(long endTime)`
`void`	`setFilter(String filter)`
`void`	`setMaxVersions(int maxVersions)`
`void`	`setStartRow(byte[] startRow)`
`void`	`setStartTime(long startTime)`
`static String`	`stringifyFilter(Filter filter)`

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

- Constructor Detail
  - ScannerModel
```
public ScannerModel()
```
    Default constructor
  - ScannerModel
```
public ScannerModel(byte[] startRow,
                    byte[] endRow,
                    List<byte[]> columns,
                    int batch,
                    int caching,
                    long endTime,
                    int maxVersions,
                    String filter)
```
    Constructor
    
    Parameters:
    
    startRow - the start key of the row-range
    
    endRow - the end key of the row-range
    
    columns - the columns to scan
    
    batch - the number of values to return in batch
    
    caching - the number of rows that the scanner will fetch at once
    
    endTime - the upper bound on timestamps of values of interest
    
    maxVersions - the maximum number of versions to return
    
    filter - a filter specification (values with timestamps later than this are excluded)
  - ScannerModel
```
public ScannerModel(byte[] startRow,
                    byte[] endRow,
                    List<byte[]> columns,
                    int batch,
                    int caching,
                    long startTime,
                    long endTime,
                    String filter)
```
    Constructor
    
    Parameters:
    
    startRow - the start key of the row-range
    
    endRow - the end key of the row-range
    
    columns - the columns to scan
    
    batch - the number of values to return in batch
    
    caching - the number of rows that the scanner will fetch at once
    
    startTime - the lower bound on timestamps of values of interest (values with timestamps earlier than this are excluded)
    
    endTime - the upper bound on timestamps of values of interest (values with timestamps later than this are excluded)
    
    filter - a filter specification
- Method Detail
  - buildFilter
```
public static Filter buildFilter(String s)
                          throws Exception
```
    Parameters:
    
    s - the JSON representation of the filter
    
    Returns:
    
    the filter
    
    Throws:
    
    Exception
  - stringifyFilter
```
public static String stringifyFilter(Filter filter)
                              throws Exception
```
    Parameters:
    
    filter - the filter
    
    Returns:
    
    the JSON representation of the filter
    
    Throws:
    
    Exception
  - fromScan
```
public static ScannerModel fromScan(Scan scan)
                             throws Exception
```
    Parameters:
    
    scan - the scan specification
    
    Throws:
    
    Exception
  - addColumn
```
public void addColumn(byte[] column)
```
    Add a column to the column set
    
    Parameters:
    
    column - the column name, as <column>(:<qualifier>)?
  - addLabel
```
public void addLabel(String label)
```
    Add a visibility label to the scan
  - hasStartRow
```
public boolean hasStartRow()
```
    Returns:
    
    true if a start row was specified
  - getStartRow
```
public byte[] getStartRow()
```
    Returns:
    
    start row
  - hasEndRow
```
public boolean hasEndRow()
```
    Returns:
    
    true if an end row was specified
  - getEndRow
```
public byte[] getEndRow()
```
    Returns:
    
    end row
  - getColumns
```
public List<byte[]> getColumns()
```
    Returns:
    
    list of columns of interest in column:qualifier format, or empty for all
  - getLabels
```
public List<String> getLabels()
```
  - getBatch
```
public int getBatch()
```
    Returns:
    
    the number of cells to return in batch
  - getCaching
```
public int getCaching()
```
    Returns:
    
    the number of rows that the scanner to fetch at once
  - getCacheBlocks
```
public boolean getCacheBlocks()
```
    Returns:
    
    true if HFile blocks should be cached on the servers for this scan, false otherwise
  - getStartTime
```
public long getStartTime()
```
    Returns:
    
    the lower bound on timestamps of items of interest
  - getEndTime
```
public long getEndTime()
```
    Returns:
    
    the upper bound on timestamps of items of interest
  - getMaxVersions
```
public int getMaxVersions()
```
    Returns:
    
    maximum number of versions to return
  - getFilter
```
public String getFilter()
```
    Returns:
    
    the filter specification
  - setStartRow
```
public void setStartRow(byte[] startRow)
```
    Parameters:
    
    startRow - start row
  - setEndRow
```
public void setEndRow(byte[] endRow)
```
    Parameters:
    
    endRow - end row
  - setColumns
```
public void setColumns(List<byte[]> columns)
```
    Parameters:
    
    columns - list of columns of interest in column:qualifier format, or empty for all
  - setBatch
```
public void setBatch(int batch)
```
    Parameters:
    
    batch - the number of cells to return in batch
  - setCaching
```
public void setCaching(int caching)
```
    Parameters:
    
    caching - the number of rows to fetch at once
  - setCacheBlocks
```
public void setCacheBlocks(boolean value)
```
    Parameters:
    
    value - true if HFile blocks should be cached on the servers for this scan, false otherwise
  - setMaxVersions
```
public void setMaxVersions(int maxVersions)
```
    Parameters:
    
    maxVersions - maximum number of versions to return
  - setStartTime
```
public void setStartTime(long startTime)
```
    Parameters:
    
    startTime - the lower bound on timestamps of values of interest
  - setEndTime
```
public void setEndTime(long endTime)
```
    Parameters:
    
    endTime - the upper bound on timestamps of values of interest
  - setFilter
```
public void setFilter(String filter)
```
    Parameters:
    
    filter - the filter specification
  - createProtobufOutput
```
public byte[] createProtobufOutput()
```
    Specified by:
    
    createProtobufOutput in interface ProtobufMessageHandler
    
    Returns:
    
    the protobuf represention of the model
  - getObjectFromMessage
```
public ProtobufMessageHandler getObjectFromMessage(byte[] message)
                                            throws IOException
```
    Description copied from interface: ProtobufMessageHandler
    
    Initialize the model from a protobuf representation.
    
    Specified by:
    
    getObjectFromMessage in interface ProtobufMessageHandler
    
    Parameters:
    
    message - the raw bytes of the protobuf message
    
    Returns:
    
    reference to self for convenience
    
    Throws:
    
    IOException

Class ScannerModel

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ScannerModel

ScannerModel

ScannerModel

Method Detail

buildFilter

stringifyFilter

fromScan

addColumn

addLabel

hasStartRow

getStartRow

hasEndRow

getEndRow

getColumns

getLabels

getBatch

getCaching

getCacheBlocks

getStartTime

getEndTime

getMaxVersions

getFilter

setStartRow

setEndRow

setColumns

setBatch

setCaching

setCacheBlocks

setMaxVersions

setStartTime

setEndTime

setFilter

createProtobufOutput

getObjectFromMessage