com.atlassian.jira.util
Class Functions
java.lang.Object
com.atlassian.jira.util.Functions
public class Functions
- extends Object
Useful standard functions.
Method Summary |
static
|
identity()
Get a function that always returns the input. |
static
|
memoize(Function<T,R> function,
ConcurrentMap<T,R> map)
Memoizer maps an input to an output and always returns the mapped result
rather than calling the wrapped function every time. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Functions
public Functions()
memoize
public static <T,R> Function<T,R> memoize(Function<T,R> function,
ConcurrentMap<T,R> map)
- Memoizer maps an input to an output and always returns the mapped result
rather than calling the wrapped function every time. Useful when the
wrapped function is expensive to call.
Note, once mapped the input and the result can only be externally
removed. Also, if the supplied function returns nulls then no memoization
will occur.
- Type Parameters:
T
- the input type. MUST be immutable.R
- the result type.- Parameters:
function
- for supplying the initial value that gets mappedmap
- for storing the key-value mappings
- Returns:
- a memoizing function.
identity
public static <T> Function<T,T> identity()
- Get a function that always returns the input.
- Type Parameters:
T
- the type of the input and the output for the function.
- Returns:
- the identity function.
Copyright © 2002-2009 Atlassian. All Rights Reserved.