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 PropDefaults
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 PropDefaults.LazyValue() {
public Object createValue(PropDefaults table) {
return new BorderFactory.createLoweredBevelBorder();
}
};
propDefaultsTable.put("MyBorder", borderLazyValue);