ColumnNodeWriter (Apache HBase 1.2.12 API)

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java.lang.Object
- org.apache.hadoop.hbase.codec.prefixtree.encode.column.ColumnNodeWriter

```
@InterfaceAudience.Private
public class ColumnNodeWriter
extends Object
```
Column nodes can be either family nodes or qualifier nodes, as both sections encode similarly. The family and qualifier sections of the data block are made of 1 or more of these nodes.
Each node is composed of 3 sections:
- tokenLength: UVInt (normally 1 byte) indicating the number of token bytes
- token[]: the actual token bytes
- parentStartPosition: the offset of the next node from the start of the family or qualifier section

Field Summary

Fields
Modifier and Type	Field and Description
`protected PrefixTreeBlockMeta`	`blockMeta`
`protected TokenizerNode`	`builderNode` fields
`protected ColumnNodeType`	`nodeType`
`protected int`	`parentStartPosition`
`protected byte[]`	`token`
`protected int`	`tokenLength`

Constructor Summary

Constructors
Constructor and Description

ColumnNodeWriter(PrefixTreeBlockMeta blockMeta, TokenizerNode builderNode, ColumnNodeType nodeType)
construct

Method Summary

Methods
Modifier and Type	Method and Description
`private void`	`calculateTokenLength()`
`int`	`getWidthUsingPlaceholderForOffsetWidth(int offsetWidthPlaceholder)` This method is called before blockMeta.qualifierOffsetWidth is known, so we pass in a placeholder.
`boolean`	`isRoot()` methods
`void`	`setParentStartPosition(int parentStartPosition)` get/set
`void`	`setTokenBytes(ByteRange source)`
`String`	`toString()` standard methods
`void`	`writeBytes(OutputStream os)`

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

Field Detail

builderNode
```
protected TokenizerNode builderNode
```
fields

blockMeta

protected PrefixTreeBlockMeta blockMeta

tokenLength
```
protected int tokenLength
```

token
```
protected byte[] token
```

parentStartPosition
```
protected int parentStartPosition
```

nodeType
```
protected ColumnNodeType nodeType
```

Constructor Detail

ColumnNodeWriter

public ColumnNodeWriter(PrefixTreeBlockMeta blockMeta,
                TokenizerNode builderNode,
                ColumnNodeType nodeType)

construct

Method Detail
- isRoot
```
public boolean isRoot()
```
  methods
- calculateTokenLength
```
private void calculateTokenLength()
```
- getWidthUsingPlaceholderForOffsetWidth
```
public int getWidthUsingPlaceholderForOffsetWidth(int offsetWidthPlaceholder)
```
  This method is called before blockMeta.qualifierOffsetWidth is known, so we pass in a placeholder.
  
  Parameters:
  offsetWidthPlaceholder - the placeholder
  
  Returns:
  node width
- writeBytes
```
public void writeBytes(OutputStream os)
                throws IOException
```
  Throws:
  
  IOException
- setTokenBytes
```
public void setTokenBytes(ByteRange source)
```
- toString
```
public String toString()
```
  standard methods
  
  Overrides:
  
  toString in class Object
- setParentStartPosition
```
public void setParentStartPosition(int parentStartPosition)
```
  get/set

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