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| <h1 class="title">ARQ - Collation</h1> |
| |
| |
| <main class="d-flex flex-xl-row flex-column"> |
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| <h2 class="h6 sticky-top m-0 p-2 bg-body-tertiary">On this page</h2> |
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| <article class="flex-column me-lg-4"> |
| <p>ARQ supports sorting results in a query. Users are able to specify |
| an expression that can be a function (built-in function, custom |
| function, or a variable).</p> |
| <p>By default, results are sorted using the default behavior provided |
| by the JVM. If you have the following query.</p> |
| <pre><code>SELECT ?label WHERE { |
| VALUES ?label { "tsahurin kieli"@fi "tšekin kieli"@fi "tulun kieli"@fi "töyhtöhyyppä"@fi } |
| } |
| ORDER BY ?label |
| </code></pre> |
| <p>The results will be returned exactly in the following order.</p> |
| <ul> |
| <li>“töyhtöhyyppä”@fi</li> |
| <li>“tsahurin kieli”@fi</li> |
| <li>“tšekin kieli”@fi</li> |
| <li>“tulun kieli”@fi</li> |
| </ul> |
| <p>However, in Finnish the expected order is as follows.</p> |
| <ul> |
| <li>“tsahurin kieli”@fi</li> |
| <li>“tšekin kieli”@fi</li> |
| <li>“tulun kieli”@fi</li> |
| <li>“töyhtöhyyppä”@fi</li> |
| </ul> |
| <p>To specify the <a href="https://en.wikipedia.org/wiki/Collation">collation</a> |
| used for sorting, we can use the ARQ <code>collation</code> function.</p> |
| <pre><code>PREFIX arq: <http://jena.apache.org/ARQ/function#> |
| SELECT ?label WHERE { |
| VALUES ?label { "tsahurin kieli"@fi "tšekin kieli"@fi "tulun kieli"@fi "töyhtöhyyppä"@fi } |
| } |
| ORDER BY arq:collation("fi", ?label) |
| </code></pre> |
| <p>The function collation receives two parameters. The first is the desired |
| collation, and the second is the function (which can be a variable, or |
| another function).</p> |
| <p>The collation used, will be the Finnish collation algorithm provided |
| with the JVM. This is done through calls to methods in the <code>java.util.Locale</code> |
| class and in the <code>java.text.Collator</code>, to retrieve a collator.</p> |
| <p>If the desired collation is not available, or invalid, the JVM behavior is |
| also adopted. It may return the default collator, but it may vary depending |
| on the JVM vendor.</p> |
| <p>Note that this function was released with Jena 3.4.0. Mixing locales may |
| lead to undesired results. See JENA-1313 for more information about the |
| implementation details.</p> |
| <p><a href="index.html">ARQ documentation index</a></p> |
| |
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