LongEncoder (Apache HBase 1.4.11 API)

java.lang.Object
- org.apache.hadoop.hbase.codec.prefixtree.encode.other.LongEncoder

```
@InterfaceAudience.Private
public class LongEncoder
extends Object
```
Used to de-duplicate, sort, minimize/diff, and serialize timestamps and mvccVersions from a collection of Cells. 1. add longs to a HashSet for fast de-duplication 2. keep track of the min and max 3. copy all values to a new long[] 4. Collections.sort the long[] 5. calculate maxDelta = max - min 6. determine FInt width based on maxDelta 7. PrefixTreeEncoder binary searches to find index of each value

Field Summary

Fields
Modifier and Type	Field and Description
`protected int`	`bytesPerDelta`
`protected int`	`bytesPerIndex`
`protected long`	`max`
`protected long`	`maxDelta`
`protected long`	`min`
`protected long[]`	`sortedUniqueValues`
`protected int`	`totalCompressedBytes`
`protected HashSet<Long>`	`uniqueValues` fields

Constructor Summary

Constructors
Constructor and Description

LongEncoder()
construct

Constructors
Constructor and Description
`LongEncoder()` construct

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`add(long timestamp)` methods
`LongEncoder`	`compile()`
`byte[]`	`getByteArray()`
`int`	`getBytesPerDelta()`
`int`	`getBytesPerIndex()`
`long`	`getDelta(int index)`
`int`	`getIndex(long value)`
`long`	`getMin()` get/set
`int`	`getNumUniqueValues()`
`int`	`getOutputArrayLength()`
`long[]`	`getSortedUniqueTimestamps()`
`int`	`getTotalCompressedBytes()`
`void`	`reset()`
`String`	`toString()` Object methods
`void`	`writeBytes(OutputStream os)`

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

Field Detail

uniqueValues
```
protected HashSet<Long> uniqueValues
```
fields

sortedUniqueValues
```
protected long[] sortedUniqueValues
```

min
```
protected long min
```

max
```
protected long max
```

maxDelta
```
protected long maxDelta
```

bytesPerDelta
```
protected int bytesPerDelta
```

bytesPerIndex
```
protected int bytesPerIndex
```

totalCompressedBytes
```
protected int totalCompressedBytes
```

Constructor Detail
- LongEncoder
```
public LongEncoder()
```
  construct

Method Detail

reset
```
public void reset()
```

add
```
public void add(long timestamp)
```
methods

compile
```
public LongEncoder compile()
```

getDelta
```
public long getDelta(int index)
```

getIndex
```
public int getIndex(long value)
```

writeBytes

public void writeBytes(OutputStream os)
                throws IOException

Throws:: IOException

getByteArray

public byte[] getByteArray()
                    throws IOException

Throws:: IOException

getOutputArrayLength
```
public int getOutputArrayLength()
```

getNumUniqueValues
```
public int getNumUniqueValues()
```

toString
```
public String toString()
```
Object methods

Overrides:

toString in class Object

getMin
```
public long getMin()
```
get/set

getBytesPerDelta
```
public int getBytesPerDelta()
```

getBytesPerIndex
```
public int getBytesPerIndex()
```

getTotalCompressedBytes
```
public int getTotalCompressedBytes()
```

getSortedUniqueTimestamps

public long[] getSortedUniqueTimestamps()

Class LongEncoder

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

uniqueValues

sortedUniqueValues

min

max

maxDelta

bytesPerDelta

bytesPerIndex

totalCompressedBytes

Constructor Detail

LongEncoder

Method Detail

reset

add

compile

getDelta

getIndex

writeBytes

getByteArray

getOutputArrayLength

getNumUniqueValues

toString

getMin

getBytesPerDelta

getBytesPerIndex

getTotalCompressedBytes

getSortedUniqueTimestamps