Headers

java.lang.Object
- com.fr.third.jgroups.util.Headers

```
public class Headers
extends java.lang.Object
```
Open addressing based implementation of a hashmap (not supporting the Map interface though) for message headers. The keys are shorts (IDs) and the values Headers, and they're stored in 2 arrays: an ID array and a headers array. The indices of the IDs array corespond with the headers array, e.g.
```
 IDs:      id-1  | id-2  | id-3  | ... | id-n |
 Headers:  hdr-1 | hdr-2 | hdr-3 | ... | hdr-n |
 
```
The arrays are populated from left to right, and any 0 slots in 'ids' can terminate an interation, or signal empty slots.
It is assumed that we only have a few headers, 3-4 on average. Note that getting a header for a given key and putting a new key/header are operations with O(n) cost, so this implementation is not recommended for a large number of elements.
This class is not synchronized
作者:

Bela Ban

构造器概要

构造器
构造器和说明

Headers(Headers other)

Headers(int capacity)

构造器
构造器和说明
`Headers(Headers other)`
`Headers(int capacity)`

方法概要

方法
限定符和类型	方法和说明
`int`	`capacity()`
`Headers`	`copy()`
`Header`	`getHeader(short id)` Returns the header associated with an ID
`java.util.Map<java.lang.Short,Header>`	`getHeaders()`
`Header[]`	`getRawHeaders()`
`short[]`	`getRawIDs()`
`int`	`marshalledSize()`
`java.lang.String`	`printHeaders()`
`java.lang.String`	`printObjectHeaders()`
`void`	`putHeader(short id, Header hdr)` Puts a header given a key into the hashmap.
`Header`	`putHeaderIfAbsent(short id, Header hdr)` Puts a header given a key into the map, only if the key doesn't exist yet
`int`	`size()`
`int`	`size(short... excluded_ids)`
`java.lang.String`	`toString()`

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

- 构造器详细资料
  - Headers
```
public Headers(int capacity)
```
  - Headers
```
public Headers(Headers other)
```
- 方法详细资料
  - getRawIDs
```
public short[] getRawIDs()
```
  - getRawHeaders
```
public Header[] getRawHeaders()
```
  - getHeader
```
public Header getHeader(short id)
```
    Returns the header associated with an ID
    
    参数:
    id - The ID
    
    返回:
  - getHeaders
```
public java.util.Map<java.lang.Short,Header> getHeaders()
```
  - printHeaders
```
public java.lang.String printHeaders()
```
  - putHeader
```
public void putHeader(short id,
             Header hdr)
```
    Puts a header given a key into the hashmap. Overwrites potential existing entry.
  - putHeaderIfAbsent
```
public Header putHeaderIfAbsent(short id,
                       Header hdr)
```
    Puts a header given a key into the map, only if the key doesn't exist yet
    
    参数:
    id -
    hdr -
    
    返回:
    the previous value associated with the specified id, or null if there was no mapping for the id. (A null return can also indicate that the map previously associated null with the id, if the implementation supports null values.)
  - copy
```
public Headers copy()
```
  - marshalledSize
```
public int marshalledSize()
```
  - size
```
public int size()
```
  - size
```
public int size(short... excluded_ids)
```
  - capacity
```
public int capacity()
```
  - printObjectHeaders
```
public java.lang.String printObjectHeaders()
```
  - toString
```
public java.lang.String toString()
```
    覆盖:
    
    toString 在类中 java.lang.Object

类 Headers

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

Headers

Headers

方法详细资料

getRawIDs

getRawHeaders

getHeader

getHeaders

printHeaders

putHeader

putHeaderIfAbsent

copy

marshalledSize

size

size

capacity

printObjectHeaders

toString