Package org.refcodes.structure

Interface Keys<K,V>

Type Parameters:

K - The type of the key.

V - The type of the value which relates to a key.

All Known Subinterfaces:

CanonicalMap, CanonicalMap.CanonicalMapBuilder, CanonicalMap.MutableCanonicalMap, Dictionary<K,V>, Dictionary.MutableDictionary<K,V>, Dictionary.MutableDictionary.DictionaryBuilder<K,V,B>, Keys.MutableKeys<K,V>, Keys.MutableValues<K,V>, PathMap<T>, PathMap.MutablePathMap<T>, PathMap.PathMapBuilder<T>, PropertiesAccessorMixin, PropertiesAccessorMixin.PropertiesBuilderMixin<T>, PropertiesAccessorMixin.PropertiesMixin, PropertiesAccessorMixin.PropertiesMutatorMixin

All Known Implementing Classes:

CanonicalMapBuilderImpl, CanonicalMapImpl, PathMapBuilderImpl, PathMapImpl

public interface Keys<K,V>

This interface provides functionality for working with keys.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	Keys.MutableKeys<K,V>	Adds mutable functionality to the Keys interface.
static interface	Keys.MutableValues<K,V>	Mixin for mutable functionality accompanying the Keys interface.

Method Summary

Modifier and Type	Method	Description
boolean	containsKey(Object aKey)	Tests whether there is an element with the given key.
boolean	containsValue(Object aValue)	This method is defined for the sake of Map conformity.
V	get(Object aKey)	Retrieves the element assigned to the given key.
default V	get(Object aKey, V aDefaultValue)	Retrieves the element assigned to the given key.
Set<K>	keySet()	Retrieves a collection containing all the keys found in the elements of this collection.
default V	use(K aKey)	Retrieves the element assigned to the given key.
Collection<V>	values()	Returns a Collection view of the values related to the contained keys.

Method Detail

containsKey

boolean containsKey(Object aKey)

Tests whether there is an element with the given key.

Parameters:

aKey - The key for which to test whether there is an element.

Returns:

True in case there is an element for the given key.

containsValue

boolean containsValue(Object aValue)

This method is defined for the sake of Map conformity. Tests whether the provided value has a key assigned.

Parameters:

aValue - The value to test if a key references this value.

Returns:

True in case the given value is referenced by a key.

get

V get(Object aKey)

Retrieves the element assigned to the given key.

Parameters:

aKey - The key for which to get the element.

Returns:

The column in question or null if there is none such column.

get

default V get(Object aKey,
              V aDefaultValue)

Retrieves the element assigned to the given key. If the key or the krey's value does not exist, then the default value is returned.

Parameters:

aKey - The key for which to get the element.

aDefaultValue - The default value in case the key's value is null.

Returns:

The column in question or null if there is none such column.

use

default V use(K aKey)
       throws KeyNotFoundException

Retrieves the element assigned to the given key. In case the given key does not exist, then an KeyNotFoundException is thrown.

Parameters:

aKey - The key for which to get the element.

Returns:

The value assigned to the given key.

Throws:

KeyNotFoundException - thrown in case this instance does not contain the requested element (no such key found in the collection).

keySet

Set<K> keySet()

Retrieves a collection containing all the keys found in the elements of this collection.

Returns:

A collection with key objects being the keys of all elements in this collection.

values

Collection<V> values()

Returns a Collection view of the values related to the contained keys.

Returns:

A Collection view of the values related to the contained keys.