Package de.eimmer.metadaten

Class FaulerMetadatenWert

java.lang.Object

de.eimmer.metadaten.MetadatenWertAdapter

de.eimmer.metadaten.FaulerMetadatenWert

All Implemented Interfaces:

MetadatenWert

Direct Known Subclasses:

UnveraenderlicherMetadatenWert

public class FaulerMetadatenWert
extends MetadatenWertAdapter

The FaulerMetadatenWert class implements a type of meta that is not computed until another zusatzmodul asks for it.

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

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	FaulerMetadatenWert.CacheStrategy	Describes possible caching strategies for meta.

Field Summary

Fields inherited from class de.eimmer.metadaten.MetadatenWertAdapter

owningPlugin

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	FaulerMetadatenWert(Zusatzmodul owningZusatzmodul)	Protected special constructor used by UnveraenderlicherMetadatenWert to bypass standard setup.
	FaulerMetadatenWert(Zusatzmodul owningZusatzmodul, FaulerMetadatenWert.CacheStrategy cacheStrategy, Callable<Object> lazyValue)	Initializes a FaulerMetadatenWert object with a specific cache strategy.
	FaulerMetadatenWert(Zusatzmodul owningZusatzmodul, Callable<Object> lazyValue)	Initialized a FaulerMetadatenWert object with the default CACHE_AFTER_FIRST_EVAL cache strategy.

Method Summary

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

Methods inherited from class de.eimmer.metadaten.MetadatenWertAdapter

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 Details

FaulerMetadatenWert

public FaulerMetadatenWert(@NotNull
 Zusatzmodul owningZusatzmodul,
 @NotNull
 Callable<Object> lazyValue)

Initialized a FaulerMetadatenWert object with the default CACHE_AFTER_FIRST_EVAL cache strategy.

Parameters:

owningZusatzmodul - the Zusatzmodul that created this meta value.

lazyValue - the lazy value assigned to this meta value.

FaulerMetadatenWert

public FaulerMetadatenWert(@NotNull
 Zusatzmodul owningZusatzmodul,
 @NotNull
 FaulerMetadatenWert.CacheStrategy cacheStrategy,
 @NotNull
 Callable<Object> lazyValue)

Initializes a FaulerMetadatenWert object with a specific cache strategy.

Parameters:

owningZusatzmodul - the Zusatzmodul that created this meta value.

cacheStrategy - determines the rules for caching this meta value.

lazyValue - the lazy value assigned to this meta value.

FaulerMetadatenWert

protected FaulerMetadatenWert(@NotNull
 Zusatzmodul owningZusatzmodul)

Protected special constructor used by UnveraenderlicherMetadatenWert to bypass standard setup.

Parameters:

owningZusatzmodul - the owning zusatzmodul

Method Details

value

@Nullable
public Object value()

Description copied from interface: MetadatenWert

Fetches the value of this meta item.

Returns:

the meta value.

invalidate

public void invalidate()

Description copied from interface: MetadatenWert

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