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package bjc.utils.funcdata;
import java.util.function.BiConsumer;
import java.util.function.Function;
/**
* Functional wrapper over map providing some useful things
*
* @author ben
*
* @param <K>
* The type of this map's keys
* @param <V>
* The type of this map's values
*
*/
public interface IFunctionalMap<K, V> {
/**
* Add an entry to the map
*
* @param key
* The key to put the value under
* @param val
* The value to add
* @return The previous value of the key in the map, or null if the key
* wasn't in the map. However, note that it may also return
* null if the key was set to null.
*
* @throws UnsupportedOperationException
* if the map implementation doesn't support modifying the
* map
*/
V put(K key, V val);
/**
* Get the value assigned to the given key
*
* @param key
* The key to look for a value under
* @return The value of the key
*
*
*/
V get(K key);
/**
* Transform the values returned by this map.
*
* NOTE: This transform is applied once for each lookup of a value, so
* the transform passed should be a proper function, or things will
* likely not work as expected.
*
* @param <V2>
* The new type of returned values
* @param transformer
* The function to use to transform values
* @return The map where each value will be transformed after lookup
*/
<V2> IFunctionalMap<K, V2> mapValues(Function<V, V2> transformer);
/**
* Check if this map contains the specified key
*
* @param key
* The key to check
* @return Whether or not the map contains the key
*/
boolean containsKey(K key);
/**
* Get a list of all the keys in this map
*
* @return A list of all the keys in this map
*/
IFunctionalList<K> keyList();
/**
* Execute an action for each entry in the map
*
* @param action
* the action to execute for each entry in the map
*/
void forEach(BiConsumer<K, V> action);
/**
* Remove the value bound to the key
*
* @param key
* The key to remove from the map
* @return The previous value for the key in the map, or null if the
* key wasn't in the class. NOTE: Just because you recieved
* null, doesn't mean the map wasn't changed. It may mean that
* someone put a null value for that key into the map
*/
V remove(K key);
/**
* Get the number of entries in this map
*
* @return The number of entries in this map
*/
int getSize();
}
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