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<?php
/**
* This file is part of the ramsey/collection library
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
* @license http://opensource.org/licenses/MIT MIT
*/
declare(strict_types=1);
namespace Ramsey\Collection\Map;
use Ramsey\Collection\Tool\TypeTrait;
/**
* A `TypedMap` represents a map of elements where key and value are typed.
*
* Each element is identified by a key with defined type and a value of defined
* type. The keys of the map must be unique. The values on the map can be
* repeated but each with its own different key.
*
* The most common case is to use a string type key, but it's not limited to
* this type of keys.
*
* This is a direct implementation of `TypedMapInterface`, provided for the sake
* of convenience.
*
* Example usage:
*
* ```php
* $map = new TypedMap('string', Foo::class);
* $map['x'] = new Foo();
* foreach ($map as $key => $value) {
* // do something with $key, it will be a Foo::class
* }
*
* // this will throw an exception since key must be string
* $map[10] = new Foo();
*
* // this will throw an exception since value must be a Foo
* $map['bar'] = 'bar';
*
* // initialize map with contents
* $map = new TypedMap('string', Foo::class, [
* new Foo(), new Foo(), new Foo()
* ]);
* ```
*
* It is preferable to subclass `AbstractTypedMap` to create your own typed map
* implementation:
*
* ```php
* class FooTypedMap extends AbstractTypedMap
* {
* public function getKeyType()
* {
* return 'int';
* }
*
* public function getValueType()
* {
* return Foo::class;
* }
* }
* ```
*
* … but you also may use the `TypedMap` class:
*
* ```php
* class FooTypedMap extends TypedMap
* {
* public function __constructor(array $data = [])
* {
* parent::__construct('int', Foo::class, $data);
* }
* }
* ```
*
* @template K of array-key
* @template T
* @extends AbstractTypedMap<K, T>
*/
class TypedMap extends AbstractTypedMap
{
use TypeTrait;
/**
* The data type of keys stored in this collection.
*
* A map key's type is immutable once it is set. For this reason, this
* property is set private.
*/
private string $keyType;
/**
* The data type of values stored in this collection.
*
* A map value's type is immutable once it is set. For this reason, this
* property is set private.
*/
private string $valueType;
/**
* Constructs a map object of the specified key and value types,
* optionally with the specified data.
*
* @param string $keyType The data type of the map's keys.
* @param string $valueType The data type of the map's values.
* @param array<K, T> $data The initial data to set for this map.
*/
public function __construct(string $keyType, string $valueType, array $data = [])
{
$this->keyType = $keyType;
$this->valueType = $valueType;
parent::__construct($data);
}
public function getKeyType(): string
{
return $this->keyType;
}
public function getValueType(): string
{
return $this->valueType;
}
}
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