JavaTM 2 Platform Std. Ed. v1.6.0
javax.swing
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)
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 - a UIDefaults table
- Returns:
- the created
Object
Copyright 2003 Sun Microsystems, Inc. All rights reserved
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