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<div class="highlight" ><pre> <span class="c">/**</span>
<span class="c"> * The State class maintains state for a collection of named items, with </span>
<span class="c"> * a varying number of properties defined.</span>
<span class="c"> *</span>
<span class="c"> * It avoids the need to create a separate class for the item, and separate instances </span>
<span class="c"> * of these classes for each item, by storing the state in a 2 level hash table, </span>
<span class="c"> * improving performance when the number of items is likely to be large.</span>
<span class="c"> *</span>
<span class="c"> * @constructor</span>
<span class="c"> * @class State</span>
<span class="c"> */</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">State</span> <span class="o">=</span> <span class="k">function</span><span class="o">()</span> <span class="o">{</span>
<span class="c">/**</span>
<span class="c"> * Hash of attributes</span>
<span class="c"> * @property data</span>
<span class="c"> */</span>
<span class="k">this</span><span class="o">.</span><span class="nx">data</span> <span class="o">=</span> <span class="o">{};</span>
<span class="o">};</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">State</span><span class="o">.</span><span class="nx">prototype</span> <span class="o">=</span> <span class="o">{</span>
<span class="c">/**</span>
<span class="c"> * Adds a property to an item.</span>
<span class="c"> *</span>
<span class="c"> * @method add</span>
<span class="c"> * @param name {String} The name of the item.</span>
<span class="c"> * @param key {String} The name of the property.</span>
<span class="c"> * @param val {Any} The value of the property.</span>
<span class="c"> */</span>
<span class="nx">add</span> <span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">name</span><span class="o">,</span> <span class="nx">key</span><span class="o">,</span> <span class="nx">val</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">d</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">data</span><span class="o">;</span>
<span class="nx">d</span><span class="o">[</span><span class="nx">key</span><span class="o">]</span> <span class="o">=</span> <span class="nx">d</span><span class="o">[</span><span class="nx">key</span><span class="o">]</span> <span class="o">||</span> <span class="o">{};</span>
<span class="nx">d</span><span class="o">[</span><span class="nx">key</span><span class="o">][</span><span class="nx">name</span><span class="o">]</span> <span class="o">=</span> <span class="nx">val</span><span class="o">;</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Adds multiple properties to an item.</span>
<span class="c"> *</span>
<span class="c"> * @method addAll</span>
<span class="c"> * @param name {String} The name of the item.</span>
<span class="c"> * @param o {Object} A hash of property/value pairs.</span>
<span class="c"> */</span>
<span class="nx">addAll</span><span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">name</span><span class="o">,</span> <span class="nx">o</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">key</span><span class="o">;</span>
<span class="k">for</span> <span class="o">(</span><span class="nx">key</span> <span class="k">in</span> <span class="nx">o</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">o</span><span class="o">.</span><span class="nx">hasOwnProperty</span><span class="o">(</span><span class="nx">key</span><span class="o">))</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="nx">add</span><span class="o">(</span><span class="nx">name</span><span class="o">,</span> <span class="nx">key</span><span class="o">,</span> <span class="nx">o</span><span class="o">[</span><span class="nx">key</span><span class="o">]);</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Removes a property from an item.</span>
<span class="c"> *</span>
<span class="c"> * @method remove</span>
<span class="c"> * @param name {String} The name of the item.</span>
<span class="c"> * @param key {String} The property to remove.</span>
<span class="c"> */</span>
<span class="nx">remove</span><span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">name</span><span class="o">,</span> <span class="nx">key</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">d</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">data</span><span class="o">;</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">d</span><span class="o">[</span><span class="nx">key</span><span class="o">]</span> <span class="o">&&</span> <span class="o">(</span><span class="nx">name</span> <span class="k">in</span> <span class="nx">d</span><span class="o">[</span><span class="nx">key</span><span class="o">]))</span> <span class="o">{</span>
<span class="nx">delete</span> <span class="nx">d</span><span class="o">[</span><span class="nx">key</span><span class="o">][</span><span class="nx">name</span><span class="o">];</span>
<span class="o">}</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Removes multiple properties from an item, or remove the item completely.</span>
<span class="c"> *</span>
<span class="c"> * @method removeAll</span>
<span class="c"> * @param name {String} The name of the item.</span>
<span class="c"> * @param o {Object|Array} Collection of properties to delete. If not provided, the entire item is removed.</span>
<span class="c"> */</span>
<span class="nx">removeAll</span><span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">name</span><span class="o">,</span> <span class="nx">o</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">d</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">data</span><span class="o">;</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">each</span><span class="o">(</span><span class="nx">o</span> <span class="o">||</span> <span class="nx">d</span><span class="o">,</span> <span class="k">function</span><span class="o">(</span><span class="nx">v</span><span class="o">,</span> <span class="nx">k</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span><span class="o">(</span><span class="nx">Y</span><span class="o">.</span><span class="nx">Lang</span><span class="o">.</span><span class="nx">isString</span><span class="o">(</span><span class="nx">k</span><span class="o">))</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="nx">remove</span><span class="o">(</span><span class="nx">name</span><span class="o">,</span> <span class="nx">k</span><span class="o">);</span>
<span class="o">}</span> <span class="k">else</span> <span class="o">{</span>
<span class="k">this</span><span class="o">.</span><span class="nx">remove</span><span class="o">(</span><span class="nx">name</span><span class="o">,</span> <span class="nx">v</span><span class="o">);</span>
<span class="o">}</span>
<span class="o">},</span> <span class="k">this</span><span class="o">);</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * For a given item, returns the value of the property requested, or undefined if not found.</span>
<span class="c"> *</span>
<span class="c"> * @method get</span>
<span class="c"> * @param name {String} The name of the item</span>
<span class="c"> * @param key {String} Optional. The property value to retrieve.</span>
<span class="c"> * @return {Any} The value of the supplied property.</span>
<span class="c"> */</span>
<span class="nx">get</span><span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">name</span><span class="o">,</span> <span class="nx">key</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">d</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">data</span><span class="o">;</span>
<span class="k">return</span> <span class="o">(</span><span class="nx">d</span><span class="o">[</span><span class="nx">key</span><span class="o">]</span> <span class="o">&&</span> <span class="nx">name</span> <span class="k">in</span> <span class="nx">d</span><span class="o">[</span><span class="nx">key</span><span class="o">])</span> <span class="o">?</span> <span class="nx">d</span><span class="o">[</span><span class="nx">key</span><span class="o">][</span><span class="nx">name</span><span class="o">]</span> <span class="o">:</span> <span class="kc">undefined</span><span class="o">;</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * For the given item, returns a disposable object with all of the</span>
<span class="c"> * item's property/value pairs.</span>
<span class="c"> *</span>
<span class="c"> * @method getAll</span>
<span class="c"> * @param name {String} The name of the item</span>
<span class="c"> * @return {Object} An object with property/value pairs for the item.</span>
<span class="c"> */</span>
<span class="nx">getAll</span> <span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">name</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">d</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">data</span><span class="o">,</span> <span class="nx">o</span><span class="o">;</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">each</span><span class="o">(</span><span class="nx">d</span><span class="o">,</span> <span class="k">function</span><span class="o">(</span><span class="nx">v</span><span class="o">,</span> <span class="nx">k</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span> <span class="o">(</span><span class="nx">name</span> <span class="k">in</span> <span class="nx">d</span><span class="o">[</span><span class="nx">k</span><span class="o">])</span> <span class="o">{</span>
<span class="nx">o</span> <span class="o">=</span> <span class="nx">o</span> <span class="o">||</span> <span class="o">{};</span>
<span class="nx">o</span><span class="o">[</span><span class="nx">k</span><span class="o">]</span> <span class="o">=</span> <span class="nx">v</span><span class="o">[</span><span class="nx">name</span><span class="o">];</span>
<span class="o">}</span>
<span class="o">},</span> <span class="k">this</span><span class="o">);</span>
<span class="k">return</span> <span class="nx">o</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">};</span>
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