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vendor/symfony/form/ChoiceList/LazyChoiceList.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Form\ChoiceList;
+
+use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
+
+/**
+ * A choice list that loads its choices lazily.
+ *
+ * The choices are fetched using a {@link ChoiceLoaderInterface} instance.
+ * If only {@link getChoicesForValues()} or {@link getValuesForChoices()} is
+ * called, the choice list is only loaded partially for improved performance.
+ *
+ * Once {@link getChoices()} or {@link getValues()} is called, the list is
+ * loaded fully.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class LazyChoiceList implements ChoiceListInterface
+{
+    private $loader;
+
+    /**
+     * The callable creating string values for each choice.
+     *
+     * If null, choices are cast to strings.
+     *
+     * @var callable|null
+     */
+    private $value;
+
+    /**
+     * Creates a lazily-loaded list using the given loader.
+     *
+     * Optionally, a callable can be passed for generating the choice values.
+     * The callable receives the choice as first and the array key as the second
+     * argument.
+     *
+     * @param callable|null $value The callable generating the choice values
+     */
+    public function __construct(ChoiceLoaderInterface $loader, callable $value = null)
+    {
+        $this->loader = $loader;
+        $this->value = $value;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getChoices()
+    {
+        return $this->loader->loadChoiceList($this->value)->getChoices();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getValues()
+    {
+        return $this->loader->loadChoiceList($this->value)->getValues();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getStructuredValues()
+    {
+        return $this->loader->loadChoiceList($this->value)->getStructuredValues();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getOriginalKeys()
+    {
+        return $this->loader->loadChoiceList($this->value)->getOriginalKeys();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getChoicesForValues(array $values)
+    {
+        return $this->loader->loadChoicesForValues($values, $this->value);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getValuesForChoices(array $choices)
+    {
+        return $this->loader->loadValuesForChoices($choices, $this->value);
+    }
+}