LongEncoder (Apache HBase - Prefix Tree 1.4.14 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

字段概要

字段
限定符和类型	字段和说明
`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

构造器概要

构造器
构造器和说明

LongEncoder()
construct

构造器
构造器和说明
`LongEncoder()` construct

方法概要

方法
限定符和类型	方法和说明
`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)`

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

字段详细资料

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
```

构造器详细资料
- LongEncoder
```
public LongEncoder()
```
  construct

方法详细资料

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

抛出:: IOException

getByteArray

public byte[] getByteArray()
                    throws IOException

抛出:: IOException

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

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

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

覆盖:

toString 在类中 Object

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

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

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

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

getSortedUniqueTimestamps

public long[] getSortedUniqueTimestamps()

类 LongEncoder

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

uniqueValues

sortedUniqueValues

min

max

maxDelta

bytesPerDelta

bytesPerIndex

totalCompressedBytes

构造器详细资料

LongEncoder

方法详细资料

reset

add

compile

getDelta

getIndex

writeBytes

getByteArray

getOutputArrayLength

getNumUniqueValues

toString

getMin

getBytesPerDelta

getBytesPerIndex

getTotalCompressedBytes

getSortedUniqueTimestamps