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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\ArrayInterface;
+
+/**
+ * An object that maps keys to values.
+ *
+ * A map cannot contain duplicate keys; each key can map to at most one value.
+ *
+ * @template T
+ * @template-extends ArrayInterface<T>
+ */
+interface MapInterface extends ArrayInterface
+{
+ /**
+ * Returns `true` if this map contains a mapping for the specified key.
+ *
+ * @param array-key $key The key to check in the map.
+ */
+ public function containsKey($key): bool;
+
+ /**
+ * Returns `true` if this map maps one or more keys to the specified value.
+ *
+ * This performs a strict type check on the value.
+ *
+ * @param T $value The value to check in the map.
+ */
+ // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+ public function containsValue($value): bool;
+
+ /**
+ * Return an array of the keys contained in this map.
+ *
+ * @return list<array-key>
+ */
+ public function keys(): array;
+
+ /**
+ * Returns the value to which the specified key is mapped, `null` if this
+ * map contains no mapping for the key, or (optionally) `$defaultValue` if
+ * this map contains no mapping for the key.
+ *
+ * @param array-key $key The key to return from the map.
+ * @param T|null $defaultValue The default value to use if `$key` is not found.
+ *
+ * @return T|null the value or `null` if the key could not be found.
+ */
+ // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+ public function get($key, $defaultValue = null);
+
+ /**
+ * Associates the specified value with the specified key in this map.
+ *
+ * If the map previously contained a mapping for the key, the old value is
+ * replaced by the specified value.
+ *
+ * @param array-key $key The key to put or replace in the map.
+ * @param T $value The value to store at `$key`.
+ *
+ * @return T|null the previous value associated with key, or `null` if
+ * there was no mapping for `$key`.
+ */
+ // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+ public function put($key, $value);
+
+ /**
+ * Associates the specified value with the specified key in this map only if
+ * it is not already set.
+ *
+ * If there is already a value associated with `$key`, this returns that
+ * value without replacing it.
+ *
+ * @param array-key $key The key to put in the map.
+ * @param T $value The value to store at `$key`.
+ *
+ * @return T|null the previous value associated with key, or `null` if
+ * there was no mapping for `$key`.
+ */
+ // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+ public function putIfAbsent($key, $value);
+
+ /**
+ * Removes the mapping for a key from this map if it is present.
+ *
+ * @param array-key $key The key to remove from the map.
+ *
+ * @return T|null the previous value associated with key, or `null` if
+ * there was no mapping for `$key`.
+ */
+ // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+ public function remove($key);
+
+ /**
+ * Removes the entry for the specified key only if it is currently mapped to
+ * the specified value.
+ *
+ * This performs a strict type check on the value.
+ *
+ * @param array-key $key The key to remove from the map.
+ * @param T $value The value to match.
+ *
+ * @return bool true if the value was removed.
+ */
+ // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+ public function removeIf($key, $value): bool;
+
+ /**
+ * Replaces the entry for the specified key only if it is currently mapped
+ * to some value.
+ *
+ * @param array-key $key The key to replace.
+ * @param T $value The value to set at `$key`.
+ *
+ * @return T|null the previous value associated with key, or `null` if
+ * there was no mapping for `$key`.
+ */
+ // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+ public function replace($key, $value);
+
+ /**
+ * Replaces the entry for the specified key only if currently mapped to the
+ * specified value.
+ *
+ * This performs a strict type check on the value.
+ *
+ * @param array-key $key The key to remove from the map.
+ * @param T $oldValue The value to match.
+ * @param T $newValue The value to use as a replacement.
+ *
+ * @return bool true if the value was replaced.
+ */
+ // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+ public function replaceIf($key, $oldValue, $newValue): bool;
+}