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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.eclipse.jetty.util</a></div> |
| <h2 title="Class TopologicalSort" class="title">Class TopologicalSort<T></h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <li>org.eclipse.jetty.util.TopologicalSort<T></li> |
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| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - The type to be sorted. It must be able to be added to a <code>HashSet</code></dd> |
| </dl> |
| <hr> |
| <pre>public class <span class="typeNameLabel">TopologicalSort<T></span> |
| extends java.lang.Object</pre> |
| <div class="block">Topological sort a list or array. |
| <p>A Topological sort is used when you have a partial ordering expressed as |
| dependencies between elements (also often represented as edges in a directed |
| acyclic graph). A Topological sort should not be used when you have a total |
| ordering expressed as a <code>Comparator</code> over the items. The algorithm has |
| the additional characteristic that dependency sets are sorted by the original |
| list order so that order is preserved when possible.</p> |
| <p> |
| The sort algorithm works by recursively visiting every item, once and |
| only once. On each visit, the items dependencies are first visited and then the |
| item is added to the sorted list. Thus the algorithm ensures that dependency |
| items are always added before dependent items.</p></div> |
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| <th class="colFirst" scope="col">Constructor</th> |
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| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">TopologicalSort</a></span>()</code></th> |
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| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#addDependency(T,T)">addDependency</a></span>​(<a href="TopologicalSort.html" title="type parameter in TopologicalSort">T</a> dependent, |
| <a href="TopologicalSort.html" title="type parameter in TopologicalSort">T</a> dependency)</code></th> |
| <td class="colLast"> |
| <div class="block">Add a dependency to be considered in the sort.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#sort(java.util.Collection)">sort</a></span>​(java.util.Collection<<a href="TopologicalSort.html" title="type parameter in TopologicalSort">T</a>> list)</code></th> |
| <td class="colLast"> |
| <div class="block">Sort the passed list according to dependencies previously set with |
| <a href="#addDependency(T,T)"><code>addDependency(Object, Object)</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#sort(T%5B%5D)">sort</a></span>​(<a href="TopologicalSort.html" title="type parameter in TopologicalSort">T</a>[] array)</code></th> |
| <td class="colLast"> |
| <div class="block">Sort the passed array according to dependencies previously set with |
| <a href="#addDependency(T,T)"><code>addDependency(Object, Object)</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#toString()">toString</a></span>()</code></th> |
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| <h4>TopologicalSort</h4> |
| <pre>public TopologicalSort()</pre> |
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| <a id="addDependency(java.lang.Object,java.lang.Object)"> |
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| <h4>addDependency</h4> |
| <pre class="methodSignature">public void addDependency​(<a href="TopologicalSort.html" title="type parameter in TopologicalSort">T</a> dependent, |
| <a href="TopologicalSort.html" title="type parameter in TopologicalSort">T</a> dependency)</pre> |
| <div class="block">Add a dependency to be considered in the sort.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>dependent</code> - The dependent item will be sorted after all its dependencies</dd> |
| <dd><code>dependency</code> - The dependency item, will be sorted before its dependent item</dd> |
| </dl> |
| </li> |
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| <h4>sort</h4> |
| <pre class="methodSignature">public void sort​(<a href="TopologicalSort.html" title="type parameter in TopologicalSort">T</a>[] array)</pre> |
| <div class="block">Sort the passed array according to dependencies previously set with |
| <a href="#addDependency(T,T)"><code>addDependency(Object, Object)</code></a>. Where possible, ordering will be |
| preserved if no dependency</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>array</code> - The array to be sorted.</dd> |
| </dl> |
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| <h4>sort</h4> |
| <pre class="methodSignature">public void sort​(java.util.Collection<<a href="TopologicalSort.html" title="type parameter in TopologicalSort">T</a>> list)</pre> |
| <div class="block">Sort the passed list according to dependencies previously set with |
| <a href="#addDependency(T,T)"><code>addDependency(Object, Object)</code></a>. Where possible, ordering will be |
| preserved if no dependency</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>list</code> - The list to be sorted.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- --> |
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| <h4>toString</h4> |
| <pre class="methodSignature">public java.lang.String toString()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code>toString</code> in class <code>java.lang.Object</code></dd> |
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