uk.ac.starlink.util

Class Util

java.lang.Object

uk.ac.starlink.util.Util

public class Util
extends java.lang.Object

General class containing utility methods. Several of these relate to the java.util classes.

Since:

18 Jul 2023

Method Summary

Modifier and Type	Method and Description
static <T> boolean	contains(java.util.Collection<T> collection, T item) Typed contains test.
static <K,V> boolean	containsKey(java.util.Map<K,V> map, K key) Typed map key test operation.
static <T> boolean	equals(T t1, T t2) Typed equality operation.
static <K,V> V	get(java.util.Map<K,V> map, K key) Typed map get operation.
static <K,V> V	remove(java.util.Map<K,V> map, K key) Typed map remove operation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

get

public static <K,V> V get(java.util.Map<K,V> map,
                          K key)

Typed map get operation. This simply calls Map.get(Object), but it provides compile-time assurance that the supplied key has the right type.

Parameters:

map - map

key - key

Returns:

result of map.get(key)

containsKey

public static <K,V> boolean containsKey(java.util.Map<K,V> map,
                                        K key)

Typed map key test operation. This simply calls Map.containsKey(Object), but it provides compile-time assurance that the supplied key has the right type.

Parameters:

map - map

key - key

Returns:

result of map.containsKey(key)

remove

public static <K,V> V remove(java.util.Map<K,V> map,
                             K key)

Typed map remove operation. This simply calls Map.remove(Object), but it provides compile-time assurance that the supplied key has the right type.

Parameters:

map - map

key - key

Returns:

result of map.remove(key)

equals

public static <T> boolean equals(T t1,
                                 T t2)

Typed equality operation. This simply calls Objects.equals(Object,Object), but provides compile-time assurance that the two supplied parameters have the same type.

Parameters:

t1 - first object

t2 - second object

Returns:

result of Objects.equals(t1, t1)

contains

public static <T> boolean contains(java.util.Collection<T> collection,
                                   T item)

Typed contains test. This simply calls Collection.contains(java.lang.Object), but provides compile-time assurance that the item's type is compatible with the collection.

Parameters:

collection - collection

item - item

Returns:

true iff item is in collection (equality semantics)