Interface UIDefaults.LazyValue
- All Known Implementing Classes:
-
UIDefaults.LazyInputMap
,UIDefaults.ProxyLazyValue
- Enclosing class:
- UIDefaults
public static interface UIDefaults.LazyValue
This class enables one to store an entry in the defaults table that isn't constructed until the first time it's looked up with one of the getXXX(key)
methods. Lazy values are useful for defaults that are expensive to construct or are seldom retrieved. The first time a LazyValue
is retrieved its "real value" is computed by calling LazyValue.createValue()
and the real value is used to replace the LazyValue
in the UIDefaults
table. Subsequent lookups for the same key return the real value. Here's an example of a LazyValue
that constructs a Border
:
Object borderLazyValue = new UIDefaults.LazyValue() { public Object createValue(UIDefaults table) { return new BorderFactory.createLoweredBevelBorder(); } }; uiDefaultsTable.put("MyBorder", borderLazyValue);
- See Also:
UIDefaults.get(java.lang.Object)
Method Summary
Modifier and Type | Method | Description |
---|---|---|
Object | createValue(UIDefaults table) | Creates the actual value retrieved from the |
Method Detail
createValue
Object createValue(UIDefaults table)
Creates the actual value retrieved from the UIDefaults
table. When an object that implements this interface is retrieved from the table, this method is used to create the real value, which is then stored in the table and returned to the calling method.
- Parameters:
-
table
- aUIDefaults
table - Returns:
- the created
Object