```
public class Metadata

                    
```
Created by vincent on 17-7-26. Copyright @ 2013-2017 Platon AI. All rights reserved
Unstable fields are persisted as a metadata, they should be moved to a real database field if it's getting stable, in which case, the database schema should be changed

Method Summary

Modifier and Type	Method	Description
`static Metadata`	`box(@Nonnull() Map<CharSequence, ByteBuffer> data)`	box.
`Map<CharSequence, ByteBuffer>`	`unbox()`	unbox.
`void`	`set(Name name, String value)`	set.
`void`	`set(String key, String value)`	set.
`void`	`set(Name name, int value)`	set.
`void`	`set(Name name, long value)`	set.
`void`	`set(Name name, Instant value)`	set.
`void`	`putAll(Map<String, String> data)`	putAll.
`void`	`putAll(Properties properties)`	Copy All key-value pairs from properties.
`ByteBuffer`	`getByteBuffer(Name name)`	getByteBuffer.
`ByteBuffer`	`getByteBuffer(String name)`	getByteBuffer.
`String`	`get(Name name)`	get.
`String`	`get(String name)`	get.
`String`	`getOrDefault(Name name, String defaultValue)`	getOrDefault.
`String`	`getOrDefault(String name, String defaultValue)`	getOrDefault.
`int`	`getInt(Name name, int defaultValue)`	getInt.
`long`	`getLong(Name name, long defaultValue)`	getLong.
`float`	`getFloat(Name name, float defaultValue)`	getFloat.
`boolean`	`getBoolean(Name name, Boolean defaultValue)`	getBoolean.
`Instant`	`getInstant(Name name, Instant defaultValue)`	getInstant.
`boolean`	`contains(Name name)`	contains.
`boolean`	`contains(String key)`	contains.
`void`	`remove(String name)`	Remove a data and all its associated values.
`void`	`remove(Name name)`	remove.
`void`	`clear()`	Remove all mappings from data.
`void`	`clear(String prefix)`	clear.
`Map<String, String>`	`asStringMap()`	asStringMap.
`boolean`	`equals(Object o)`
`String`	`toString()`

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

- Method Detail
  - box
```
@Nonnull() static Metadata box(@Nonnull() Map<CharSequence, ByteBuffer> data)
```
    box.
    
    Parameters:
    
    data - a java.util.Map object.
  - unbox
```
 Map<CharSequence, ByteBuffer> unbox()
```
    unbox.
  - set
```
 void set(Name name, String value)
```
    set.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
    
    value - a java.lang.String object.
  - set
```
 void set(String key, String value)
```
    set.
    
    Parameters:
    
    key - a java.lang.String object.
    
    value - a java.lang.String object.
  - set
```
 void set(Name name, int value)
```
    set.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
    
    value - a int.
  - set
```
 void set(Name name, long value)
```
    set.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
    
    value - a long.
  - set
```
 void set(Name name, Instant value)
```
    set.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
    
    value - a java.time.Instant object.
  - putAll
```
 void putAll(Map<String, String> data)
```
    putAll.
    
    Parameters:
    
    data - a java.util.Map object.
  - putAll
```
 void putAll(Properties properties)
```
    Copy All key-value pairs from properties.
    
    Parameters:
    
    properties - properties to copy from
  - getByteBuffer
```
 ByteBuffer getByteBuffer(Name name)
```
    getByteBuffer.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
  - getByteBuffer
```
 ByteBuffer getByteBuffer(String name)
```
    getByteBuffer.
    
    Parameters:
    
    name - a java.lang.String object.
  - get
```
 String get(Name name)
```
    get.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
  - get
```
 String get(String name)
```
    get.
    
    Parameters:
    
    name - a java.lang.String object.
  - getOrDefault
```
 String getOrDefault(Name name, String defaultValue)
```
    getOrDefault.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
    
    defaultValue - a java.lang.String object.
  - getOrDefault
```
 String getOrDefault(String name, String defaultValue)
```
    getOrDefault.
    
    Parameters:
    
    name - a java.lang.String object.
    
    defaultValue - a java.lang.String object.
  - getInt
```
 int getInt(Name name, int defaultValue)
```
    getInt.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
    
    defaultValue - a int.
  - getLong
```
 long getLong(Name name, long defaultValue)
```
    getLong.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
    
    defaultValue - a long.
  - getFloat
```
 float getFloat(Name name, float defaultValue)
```
    getFloat.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
    
    defaultValue - a float.
  - getBoolean
```
 boolean getBoolean(Name name, Boolean defaultValue)
```
    getBoolean.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
    
    defaultValue - a java.lang.Boolean object.
  - getInstant
```
 Instant getInstant(Name name, Instant defaultValue)
```
    getInstant.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
    
    defaultValue - a java.time.Instant object.
  - contains
```
 boolean contains(Name name)
```
    contains.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
  - contains
```
 boolean contains(String key)
```
    contains.
    
    Parameters:
    
    key - a java.lang.String object.
  - remove
```
 void remove(String name)
```
    Remove a data and all its associated values.
    
    Parameters:
    
    name - data name to remove
  - remove
```
 void remove(Name name)
```
    remove.
    
    Parameters:
    
    name - a ai.platon.pulsar.persist.metadata.Name object.
  - clear
```
 void clear()
```
    Remove all mappings from data.
  - clear
```
 void clear(String prefix)
```
    clear.
    
    Parameters:
    
    prefix - a java.lang.String object.
  - asStringMap
```
 Map<String, String> asStringMap()
```
    asStringMap.
  - equals
```
 boolean equals(Object o)
```
  - toString
```
 String toString()
```

Class Metadata

Method Summary

Methods inherited from class java.lang.Object

Method Detail

box

unbox

set

set

set

set

set

putAll

putAll

getByteBuffer

getByteBuffer

get

get

getOrDefault

getOrDefault

getInt

getLong

getFloat

getBoolean

getInstant

contains

contains

remove

remove

clear

clear

asStringMap

equals

toString