Classes List

Symfony\Component\Form\AbstractRendererEngine

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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;

/** * Default implementation of {@link FormRendererEngineInterface}. * * @author Bernhard Schussek <bschussek@gmail.com> */
abstract class AbstractRendererEngine implements FormRendererEngineInterface
{
    /** * The variable in {@link FormView} used as cache key. */
    const CACHE_KEY_VAR = 'cache_key';

    protected $defaultThemes;
    protected $themes = array();
    protected $useDefaultThemes = array();
    protected $resources = array();

    private $resourceHierarchyLevels = array();

    /** * Creates a new renderer engine. * * @param array $defaultThemes The default themes. The type of these * themes is open to the implementation. */
    public function __construct(array $defaultThemes = array())
    {
        $this->defaultThemes = $defaultThemes;
    }

    /** * {@inheritdoc} */
    public function setTheme(FormView $view$themes /*, $useDefaultThemes = true */
)
    {
        $cacheKey = $view->vars[self::CACHE_KEY_VAR];

        // Do not cast, as casting turns objects into arrays of properties
        $this->themes[$cacheKey] = is_array($themes) ? $themes : array($themes);

        $args = func_get_args();
        $this->useDefaultThemes[$cacheKey] = isset($args[2]) ? (bool) $args[2] : true;

        // Unset instead of resetting to an empty array, in order to allow
        // implementations (like TwigRendererEngine) to check whether $cacheKey
        // is set at all.
        unset($this->resources[$cacheKey], $this->resourceHierarchyLevels[$cacheKey]);
    }

    /** * {@inheritdoc} */
    public function getResourceForBlockName(FormView $view$blockName)
    {
        $cacheKey = $view->vars[self::CACHE_KEY_VAR];

        if (!isset($this->resources[$cacheKey][$blockName])) {
            $this->loadResourceForBlockName($cacheKey$view$blockName);
        }

        return $this->resources[$cacheKey][$blockName];
    }

    /** * {@inheritdoc} */
    public function getResourceForBlockNameHierarchy(FormView $viewarray $blockNameHierarchy$hierarchyLevel)
    {
        $cacheKey = $view->vars[self::CACHE_KEY_VAR];
        $blockName = $blockNameHierarchy[$hierarchyLevel];

        if (!isset($this->resources[$cacheKey][$blockName])) {
            $this->loadResourceForBlockNameHierarchy($cacheKey$view$blockNameHierarchy$hierarchyLevel);
        }

        return $this->resources[$cacheKey][$blockName];
    }

    /** * {@inheritdoc} */
    public function getResourceHierarchyLevel(FormView $viewarray $blockNameHierarchy$hierarchyLevel)
    {
        $cacheKey = $view->vars[self::CACHE_KEY_VAR];
        $blockName = $blockNameHierarchy[$hierarchyLevel];

        if (!isset($this->resources[$cacheKey][$blockName])) {
            $this->loadResourceForBlockNameHierarchy($cacheKey$view$blockNameHierarchy$hierarchyLevel);
        }

        // If $block was previously rendered loaded with loadTemplateForBlock(), the template
        // is cached but the hierarchy level is not. In this case, we know that the block
        // exists at this very hierarchy level, so we can just set it.
        if (!isset($this->resourceHierarchyLevels[$cacheKey][$blockName])) {
            $this->resourceHierarchyLevels[$cacheKey][$blockName] = $hierarchyLevel;
        }

        return $this->resourceHierarchyLevels[$cacheKey][$blockName];
    }

    /** * Loads the cache with the resource for a given block name. * * @see getResourceForBlock() * * @param string $cacheKey The cache key of the form view * @param FormView $view The form view for finding the applying themes * @param string $blockName The name of the block to load * * @return bool True if the resource could be loaded, false otherwise */
    abstract protected function loadResourceForBlockName($cacheKeyFormView $view$blockName);

    /** * Loads the cache with the resource for a specific level of a block hierarchy. * * @see getResourceForBlockHierarchy() * * @param string $cacheKey The cache key used for storing the * resource * @param FormView $view The form view for finding the applying * themes * @param array $blockNameHierarchy The block hierarchy, with the most * specific block name at the end * @param int $hierarchyLevel The level in the block hierarchy that * should be loaded * * @return bool True if the resource could be loaded, false otherwise */
    private function loadResourceForBlockNameHierarchy($cacheKeyFormView $viewarray $blockNameHierarchy$hierarchyLevel)
    {
        $blockName = $blockNameHierarchy[$hierarchyLevel];

        // Try to find a template for that block
        if ($this->loadResourceForBlockName($cacheKey$view$blockName)) {
            // If loadTemplateForBlock() returns true, it was able to populate the
            // cache. The only missing thing is to set the hierarchy level at which
            // the template was found.
            $this->resourceHierarchyLevels[$cacheKey][$blockName] = $hierarchyLevel;

            return true;
        }

        if ($hierarchyLevel > 0) {
            $parentLevel = $hierarchyLevel - 1;
            $parentBlockName = $blockNameHierarchy[$parentLevel];

            // The next two if statements contain slightly duplicated code. This is by intention
            // and tries to avoid execution of unnecessary checks in order to increase performance.

            if (isset($this->resources[$cacheKey][$parentBlockName])) {
                // It may happen that the parent block is already loaded, but its level is not.
                // In this case, the parent block must have been loaded by loadResourceForBlock(),
                // which does not check the hierarchy of the block. Subsequently the block must have
                // been found directly on the parent level.
                if (!isset($this->resourceHierarchyLevels[$cacheKey][$parentBlockName])) {
                    $this->resourceHierarchyLevels[$cacheKey][$parentBlockName] = $parentLevel;
                }

                // Cache the shortcuts for further accesses
                $this->resources[$cacheKey][$blockName] = $this->resources[$cacheKey][$parentBlockName];
                $this->resourceHierarchyLevels[$cacheKey][$blockName] = $this->resourceHierarchyLevels[$cacheKey][$parentBlockName];

                return true;
            }

            if ($this->loadResourceForBlockNameHierarchy($cacheKey$view$blockNameHierarchy$parentLevel)) {
                // Cache the shortcuts for further accesses
                $this->resources[$cacheKey][$blockName] = $this->resources[$cacheKey][$parentBlockName];
                $this->resourceHierarchyLevels[$cacheKey][$blockName] = $this->resourceHierarchyLevels[$cacheKey][$parentBlockName];

                return true;
            }
        }

        // Cache the result for further accesses
        $this->resources[$cacheKey][$blockName] = false;
        $this->resourceHierarchyLevels[$cacheKey][$blockName] = false;

        return false;
    }
}