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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';

    
/**
     * @var array
     */
    
protected $defaultThemes;

    
/**
     * @var array
     */
    
protected $themes = array();

    
/**
     * @var array
     */
    
protected $resources = array();

    
/**
     * @var 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)
    {
        
$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);

        
// 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]);
        unset(
$this->resourceHierarchyLevels[$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 $view, array $blockNameHierarchy$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 $view, array $blockNameHierarchy$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 Boolean 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 integer  $hierarchyLevel     The level in the block hierarchy that
     *                                     should be loaded.
     *
     * @return Boolean True if the resource could be loaded, false otherwise.
     */
    
private function loadResourceForBlockNameHierarchy($cacheKeyFormView $view, array $blockNameHierarchy$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;
    }
}

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