1 | <?php |
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2 | |
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3 | /* |
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4 | * This file is part of the Assetic package, an OpenSky project. |
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5 | * |
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6 | * (c) 2010-2012 OpenSky Project Inc |
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7 | * |
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8 | * For the full copyright and license information, please view the LICENSE |
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9 | * file that was distributed with this source code. |
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10 | */ |
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11 | |
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12 | namespace Assetic\Factory; |
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13 | |
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14 | use Assetic\AssetManager; |
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15 | use Assetic\Factory\Loader\FormulaLoaderInterface; |
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16 | use Assetic\Factory\Resource\ResourceInterface; |
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17 | |
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18 | /** |
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19 | * A lazy asset manager is a composition of a factory and many formula loaders. |
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20 | * |
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21 | * @author Kris Wallsmith <kris.wallsmith@gmail.com> |
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22 | */ |
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23 | class LazyAssetManager extends AssetManager |
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24 | { |
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25 | private $factory; |
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26 | private $loaders; |
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27 | private $resources; |
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28 | private $formulae; |
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29 | private $loaded; |
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30 | private $loading; |
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31 | |
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32 | /** |
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33 | * Constructor. |
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34 | * |
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35 | * @param AssetFactory $factory The asset factory |
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36 | * @param array $loaders An array of loaders indexed by alias |
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37 | */ |
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38 | public function __construct(AssetFactory $factory, $loaders = array()) |
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39 | { |
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40 | $this->factory = $factory; |
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41 | $this->loaders = array(); |
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42 | $this->resources = array(); |
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43 | $this->formulae = array(); |
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44 | $this->loaded = false; |
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45 | $this->loading = false; |
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46 | |
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47 | foreach ($loaders as $alias => $loader) { |
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48 | $this->setLoader($alias, $loader); |
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49 | } |
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50 | } |
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51 | |
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52 | /** |
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53 | * Adds a loader to the asset manager. |
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54 | * |
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55 | * @param string $alias An alias for the loader |
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56 | * @param FormulaLoaderInterface $loader A loader |
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57 | */ |
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58 | public function setLoader($alias, FormulaLoaderInterface $loader) |
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59 | { |
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60 | $this->loaders[$alias] = $loader; |
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61 | $this->loaded = false; |
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62 | } |
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63 | |
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64 | /** |
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65 | * Adds a resource to the asset manager. |
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66 | * |
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67 | * @param ResourceInterface $resource A resource |
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68 | * @param string $loader The loader alias for this resource |
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69 | */ |
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70 | public function addResource(ResourceInterface $resource, $loader) |
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71 | { |
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72 | $this->resources[$loader][] = $resource; |
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73 | $this->loaded = false; |
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74 | } |
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75 | |
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76 | /** |
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77 | * Returns an array of resources. |
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78 | * |
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79 | * @return array An array of resources |
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80 | */ |
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81 | public function getResources() |
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82 | { |
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83 | $resources = array(); |
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84 | foreach ($this->resources as $r) { |
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85 | $resources = array_merge($resources, $r); |
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86 | } |
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87 | |
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88 | return $resources; |
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89 | } |
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90 | |
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91 | /** |
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92 | * Checks for an asset formula. |
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93 | * |
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94 | * @param string $name An asset name |
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95 | * |
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96 | * @return Boolean If there is a formula |
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97 | */ |
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98 | public function hasFormula($name) |
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99 | { |
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100 | if (!$this->loaded) { |
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101 | $this->load(); |
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102 | } |
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103 | |
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104 | return isset($this->formulae[$name]); |
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105 | } |
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106 | |
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107 | /** |
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108 | * Returns an asset's formula. |
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109 | * |
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110 | * @param string $name An asset name |
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111 | * |
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112 | * @return array The formula |
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113 | * |
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114 | * @throws \InvalidArgumentException If there is no formula by that name |
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115 | */ |
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116 | public function getFormula($name) |
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117 | { |
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118 | if (!$this->loaded) { |
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119 | $this->load(); |
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120 | } |
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121 | |
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122 | if (!isset($this->formulae[$name])) { |
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123 | throw new \InvalidArgumentException(sprintf('There is no "%s" formula.', $name)); |
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124 | } |
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125 | |
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126 | return $this->formulae[$name]; |
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127 | } |
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128 | |
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129 | /** |
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130 | * Sets a formula on the asset manager. |
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131 | * |
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132 | * @param string $name An asset name |
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133 | * @param array $formula A formula |
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134 | */ |
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135 | public function setFormula($name, array $formula) |
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136 | { |
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137 | $this->formulae[$name] = $formula; |
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138 | } |
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139 | |
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140 | /** |
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141 | * Loads formulae from resources. |
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142 | * |
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143 | * @throws \LogicException If a resource has been added to an invalid loader |
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144 | */ |
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145 | public function load() |
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146 | { |
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147 | if ($this->loading) { |
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148 | return; |
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149 | } |
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150 | |
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151 | if ($diff = array_diff(array_keys($this->resources), array_keys($this->loaders))) { |
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152 | throw new \LogicException('The following loader(s) are not registered: '.implode(', ', $diff)); |
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153 | } |
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154 | |
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155 | $this->loading = true; |
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156 | |
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157 | foreach ($this->resources as $loader => $resources) { |
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158 | foreach ($resources as $resource) { |
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159 | $this->formulae = array_replace($this->formulae, $this->loaders[$loader]->load($resource)); |
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160 | } |
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161 | } |
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162 | |
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163 | $this->loaded = true; |
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164 | $this->loading = false; |
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165 | } |
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166 | |
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167 | public function get($name) |
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168 | { |
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169 | if (!$this->loaded) { |
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170 | $this->load(); |
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171 | } |
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172 | |
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173 | if (!parent::has($name) && isset($this->formulae[$name])) { |
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174 | list($inputs, $filters, $options) = $this->formulae[$name]; |
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175 | $options['name'] = $name; |
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176 | parent::set($name, $this->factory->createAsset($inputs, $filters, $options)); |
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177 | } |
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178 | |
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179 | return parent::get($name); |
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180 | } |
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181 | |
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182 | public function has($name) |
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183 | { |
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184 | if (!$this->loaded) { |
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185 | $this->load(); |
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186 | } |
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187 | |
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188 | return isset($this->formulae[$name]) || parent::has($name); |
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189 | } |
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190 | |
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191 | public function getNames() |
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192 | { |
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193 | if (!$this->loaded) { |
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194 | $this->load(); |
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195 | } |
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196 | |
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197 | return array_unique(array_merge(parent::getNames(), array_keys($this->formulae))); |
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198 | } |
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199 | |
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200 | public function isDebug() |
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201 | { |
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202 | return $this->factory->isDebug(); |
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203 | } |
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204 | } |
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