ColumnReader (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.hbase.codec.prefixtree.decode.column.ColumnReader

```
@InterfaceAudience.Private
public class ColumnReader
extends Object
```
Position one of these appropriately in the data block and you can call its methods to retrieve the family or qualifier at the current position.

Field Summary

Fields
Modifier and Type	Field and Description
`protected PrefixTreeBlockMeta`	`blockMeta` fields
`protected byte[]`	`columnBuffer`
`protected int`	`columnLength`
`protected ColumnNodeReader`	`columnNodeReader`
`protected int`	`columnOffset`
`protected ColumnNodeType`	`nodeType`

Constructor Summary

Constructors
Constructor and Description

ColumnReader(byte[] columnBuffer, ColumnNodeType nodeType)
construct

Constructors
Constructor and Description
`ColumnReader(byte[] columnBuffer, ColumnNodeType nodeType)` construct

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`clearColumnBuffer()`
`byte[]`	`copyBufferToNewArray()`
`int`	`getColumnLength()`
`int`	`getColumnOffset()` get/set
`void`	`initOnBlock(PrefixTreeBlockMeta blockMeta, byte[] block)`
`ColumnReader`	`populateBuffer(int offsetIntoColumnData)` methods

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

Field Detail

blockMeta

protected PrefixTreeBlockMeta blockMeta

fields

columnBuffer
```
protected byte[] columnBuffer
```

columnOffset
```
protected int columnOffset
```

columnLength
```
protected int columnLength
```

nodeType
```
protected ColumnNodeType nodeType
```

columnNodeReader

protected ColumnNodeReader columnNodeReader

Constructor Detail

ColumnReader

public ColumnReader(byte[] columnBuffer,
            ColumnNodeType nodeType)

construct

Method Detail

initOnBlock

public void initOnBlock(PrefixTreeBlockMeta blockMeta,
               byte[] block)

populateBuffer

public ColumnReader populateBuffer(int offsetIntoColumnData)

methods

copyBufferToNewArray
```
public byte[] copyBufferToNewArray()
```

getColumnLength
```
public int getColumnLength()
```

clearColumnBuffer
```
public void clearColumnBuffer()
```

getColumnOffset
```
public int getColumnOffset()
```
get/set

Class ColumnReader

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

blockMeta

columnBuffer

columnOffset

columnLength

nodeType

columnNodeReader

Constructor Detail

ColumnReader

Method Detail

initOnBlock

populateBuffer

copyBufferToNewArray

getColumnLength

clearColumnBuffer

getColumnOffset