Package org.bukkit.metadata

Class LazyMetadataValue

java.lang.Object

org.bukkit.metadata.MetadataValueAdapter

org.bukkit.metadata.LazyMetadataValue

All Implemented Interfaces:

MetadataValue

Direct Known Subclasses:

FixedMetadataValue

public class LazyMetadataValue
extends MetadataValueAdapter
implements MetadataValue

The LazyMetadataValue class implements a type of metadata that is not computed until another plugin asks for it.

By making metadata values lazy, no computation is done by the providing plugin until absolutely necessary (if ever). Additionally, LazyMetadataValue objects cache their values internally unless overridden by a LazyMetadataValue.CacheStrategy or invalidated at the individual or plugin level. Once invalidated, the LazyMetadataValue will recompute its value when asked.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	LazyMetadataValue.CacheStrategy	Describes possible caching strategies for metadata.

Field Summary

Fields inherited from class org.bukkit.metadata.MetadataValueAdapter

owningPlugin

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	LazyMetadataValue(Plugin owningPlugin)	Protected special constructor used by FixedMetadataValue to bypass standard setup.
	LazyMetadataValue(Plugin owningPlugin, java.util.concurrent.Callable<java.lang.Object> lazyValue)	Initialized a LazyMetadataValue object with the default CACHE_AFTER_FIRST_EVAL cache strategy.
	LazyMetadataValue(Plugin owningPlugin, LazyMetadataValue.CacheStrategy cacheStrategy, java.util.concurrent.Callable<java.lang.Object> lazyValue)	Initializes a LazyMetadataValue object with a specific cache strategy.

Method Summary

Modifier and Type	Method	Description
void	invalidate()	Invalidates this metadata item, forcing it to recompute when next accessed.
java.lang.Object	value()	Fetches the value of this metadata item.

Methods inherited from interface org.bukkit.metadata.MetadataValue

asBoolean, asByte, asDouble, asFloat, asInt, asLong, asShort, asString, getOwningPlugin

Methods inherited from class org.bukkit.metadata.MetadataValueAdapter

asBoolean, asByte, asDouble, asFloat, asInt, asLong, asShort, asString, getOwningPlugin

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LazyMetadataValue

public LazyMetadataValue(Plugin owningPlugin,
                         java.util.concurrent.Callable<java.lang.Object> lazyValue)

Initialized a LazyMetadataValue object with the default CACHE_AFTER_FIRST_EVAL cache strategy.

Parameters:

owningPlugin - the Plugin that created this metadata value.

lazyValue - the lazy value assigned to this metadata value.

LazyMetadataValue

public LazyMetadataValue(Plugin owningPlugin,
                         LazyMetadataValue.CacheStrategy cacheStrategy,
                         java.util.concurrent.Callable<java.lang.Object> lazyValue)

Initializes a LazyMetadataValue object with a specific cache strategy.

Parameters:

owningPlugin - the Plugin that created this metadata value.

cacheStrategy - determines the rules for caching this metadata value.

lazyValue - the lazy value assigned to this metadata value.

LazyMetadataValue

protected LazyMetadataValue(Plugin owningPlugin)

Protected special constructor used by FixedMetadataValue to bypass standard setup.

Parameters:

owningPlugin - the owning plugin

Method Detail

value

public java.lang.Object value()

Description copied from interface: MetadataValue

Fetches the value of this metadata item.

Specified by:

value in interface MetadataValue

Returns:

the metadata value.

invalidate

public void invalidate()

Description copied from interface: MetadataValue

Invalidates this metadata item, forcing it to recompute when next accessed.

Specified by:

invalidate in interface MetadataValue