Header (I2P Anonymous Network - Java Documentation

java.lang.Object
- org.jrobin.core.Header

すべての実装されたインタフェース:

RrdUpdater
```
public class Header
extends java.lang.Object
implements RrdUpdater
```
Class to represent RRD header. Header information is mainly static (once set, it cannot be changed), with the exception of last update time (this value is changed whenever RRD gets updated).
Normally, you don't need to manipulate the Header object directly - JRobin framework does it for you.

作成者:

Sasa Markovic*

フィールドの概要

フィールド
修飾子とタイプ	フィールド	説明
`(package private) static java.lang.String`	`DEFAULT_SIGNATURE`
`(package private) static java.lang.String`	`RRDTOOL_VERSION`
`(package private) static java.lang.String`	`SIGNATURE`
`(package private) static int`	`SIGNATURE_LENGTH`

コンストラクタの概要

コンストラクタ
コンストラクタ説明

Header(RrdDb parentDb, DataImporter reader)

Header(RrdDb parentDb, RrdDef rrdDef)

コンストラクタ
コンストラクタ	説明
`Header(RrdDb parentDb, DataImporter reader)`
`Header(RrdDb parentDb, RrdDef rrdDef)`

メソッドの概要

すべてのメソッドインスタンス・メソッド concreteメソッド
修飾子とタイプ	メソッド	説明
`(package private) void`	`appendXml(XmlWriter writer)`
`void`	`copyStateTo(RrdUpdater other)`	Copies object's internal state to another Header object.
`(package private) java.lang.String`	`dump()`
`int`	`getArcCount()`	Returns the number of archives defined in the RRD.
`int`	`getDsCount()`	Returns the number of datasources defined in the RRD.
`java.lang.String`	`getInfo()`
`long`	`getLastUpdateTime()`	Returns the last update time of the RRD.
`RrdAllocator`	`getRrdAllocator()`	Required to implement RrdUpdater interface.
`RrdBackend`	`getRrdBackend()`	Returns the underlying storage (backend) object which actually performs all I/O operations.
`java.lang.String`	`getSignature()`	Returns RRD signature.
`long`	`getStep()`	Returns primary RRD time step.
`(package private) boolean`	`isJRobinHeader()`
`void`	`setInfo(java.lang.String info)`
`void`	`setLastUpdateTime(long lastUpdateTime)`
`(package private) void`	`validateHeader()`

クラスから継承されたメソッド java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- フィールドの詳細
  - SIGNATURE_LENGTH
```
static final int SIGNATURE_LENGTH
```
    関連項目:
    
    定数フィールド値
  - SIGNATURE
```
static final java.lang.String SIGNATURE
```
    関連項目:
    
    定数フィールド値
  - DEFAULT_SIGNATURE
```
static final java.lang.String DEFAULT_SIGNATURE
```
    関連項目:
    
    定数フィールド値
  - RRDTOOL_VERSION
```
static final java.lang.String RRDTOOL_VERSION
```
    関連項目:
    
    定数フィールド値
- コンストラクタの詳細
  - Header
```
Header(RrdDb parentDb,
       RrdDef rrdDef)
throws java.io.IOException
```
    例外:
    
    java.io.IOException
  - Header
```
Header(RrdDb parentDb,
       DataImporter reader)
throws java.io.IOException,
       RrdException
```
    例外:
    
    java.io.IOException
    
    RrdException
- メソッドの詳細
  - getSignature
```
public java.lang.String getSignature()
                              throws java.io.IOException
```
    Returns RRD signature. Initially, the returned string will be of the form JRobin, version x.x. Note: RRD format did not change since Jrobin 1.0.0 release (and probably never will).
    
    戻り値:
    
    RRD signature
    
    例外:
    
    java.io.IOException - Thrown in case of I/O error
  - getInfo
```
public java.lang.String getInfo()
                         throws java.io.IOException
```
    例外:
    
    java.io.IOException
  - setInfo
```
public void setInfo(java.lang.String info)
             throws java.io.IOException
```
    例外:
    
    java.io.IOException
  - getLastUpdateTime
```
public long getLastUpdateTime()
                       throws java.io.IOException
```
    Returns the last update time of the RRD.
    
    戻り値:
    
    Timestamp (Unix epoch, no milliseconds) corresponding to the last update time.
    
    例外:
    
    java.io.IOException - Thrown in case of I/O error
  - getStep
```
public long getStep()
             throws java.io.IOException
```
    Returns primary RRD time step.
    
    戻り値:
    
    Primary time step in seconds
    
    例外:
    
    java.io.IOException - Thrown in case of I/O error
  - getDsCount
```
public int getDsCount()
               throws java.io.IOException
```
    Returns the number of datasources defined in the RRD.
    
    戻り値:
    
    Number of datasources defined
    
    例外:
    
    java.io.IOException - Thrown in case of I/O error
  - getArcCount
```
public int getArcCount()
                throws java.io.IOException
```
    Returns the number of archives defined in the RRD.
    
    戻り値:
    
    Number of archives defined
    
    例外:
    
    java.io.IOException - Thrown in case of I/O error
  - setLastUpdateTime
```
public void setLastUpdateTime(long lastUpdateTime)
                       throws java.io.IOException
```
    例外:
    
    java.io.IOException
  - dump
```
java.lang.String dump()
               throws java.io.IOException
```
    例外:
    
    java.io.IOException
  - appendXml
```
void appendXml(XmlWriter writer)
        throws java.io.IOException
```
    例外:
    
    java.io.IOException
  - copyStateTo
```
public void copyStateTo(RrdUpdater other)
                 throws java.io.IOException,
                        RrdException
```
    Copies object's internal state to another Header object.
    
    定義:
    
    copyStateTo インタフェース内 RrdUpdater
    
    パラメータ:
    
    other - New Header object to copy state to
    
    例外:
    
    java.io.IOException - Thrown in case of I/O error
    
    RrdException - Thrown if supplied argument is not a Header object
  - getRrdBackend
```
public RrdBackend getRrdBackend()
```
    Returns the underlying storage (backend) object which actually performs all I/O operations.
    
    定義:
    
    getRrdBackend インタフェース内 RrdUpdater
    
    戻り値:
    
    I/O backend object
  - isJRobinHeader
```
boolean isJRobinHeader()
                throws java.io.IOException
```
    例外:
    
    java.io.IOException
  - validateHeader
```
void validateHeader()
             throws java.io.IOException,
                    RrdException
```
    例外:
    
    java.io.IOException
    
    RrdException
  - getRrdAllocator
```
public RrdAllocator getRrdAllocator()
```
    Required to implement RrdUpdater interface. You should never call this method directly.
    
    定義:
    
    getRrdAllocator インタフェース内 RrdUpdater
    
    戻り値:
    
    Allocator object

クラス Header

フィールドの概要

コンストラクタの概要

メソッドの概要

クラスから継承されたメソッド java.lang.Object

フィールドの詳細

SIGNATURE_LENGTH

SIGNATURE

DEFAULT_SIGNATURE

RRDTOOL_VERSION

コンストラクタの詳細

Header

Header

メソッドの詳細

getSignature

getInfo

setInfo

getLastUpdateTime

getStep

getDsCount

getArcCount

setLastUpdateTime

dump

appendXml

copyStateTo

getRrdBackend

isJRobinHeader

validateHeader

getRrdAllocator