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SingleDataSource.html
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<!DOCTYPE html>
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<article class="main-content">
<section class="section">
<div class="section-content top-matter">
<h1>SingleDataSource</h1>
<div class="declaration">
<div class="language">
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">SingleDataSource</span></code></pre>
</div>
</div>
<p>A protocol describing a type that listens for changes in an underlying data set (powered by a <code><a href="../Protocols/DataContext.html">DataContext</a></code>) on a
single object described by a set of <code>attributes</code>. Conforming declarations should invoke the <code>onChange</code> closure when the
monitored object happens to change.</p>
<div class="slightly-smaller">
<a href="https://github.com/oreillymedia/flapjack/tree/master/Sources/Core/SingleDataSource.swift#L16-L31">Show on GitHub</a>
</div>
</div>
</section>
<section class="section">
<div class="section-content">
<div class="task-group">
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:8Flapjack16SingleDataSourceP9ModelTypeQa"></a>
<a name="//apple_ref/swift/Alias/ModelType" class="dashAnchor"></a>
<a class="token" href="#/s:8Flapjack16SingleDataSourceP9ModelTypeQa">ModelType</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A generic alias for the underlying type of model object matched and monitored by the data source.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">associatedtype</span> <span class="kt">ModelType</span> <span class="p">:</span> <span class="kt"><a href="../Protocols/DataObject.html">DataObject</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/oreillymedia/flapjack/tree/master/Sources/Core/SingleDataSource.swift#L18">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:8Flapjack16SingleDataSourceP9predicateSo11NSPredicateCvp"></a>
<a name="//apple_ref/swift/Property/predicate" class="dashAnchor"></a>
<a class="token" href="#/s:8Flapjack16SingleDataSourceP9predicateSo11NSPredicateCvp">predicate</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The criteria being used for finding the object being observed by this data source.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">predicate</span><span class="p">:</span> <span class="kt">NSPredicate</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/oreillymedia/flapjack/tree/master/Sources/Core/SingleDataSource.swift#L21">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:8Flapjack16SingleDataSourceP6object9ModelTypeQzSgvp"></a>
<a name="//apple_ref/swift/Property/object" class="dashAnchor"></a>
<a class="token" href="#/s:8Flapjack16SingleDataSourceP6object9ModelTypeQzSgvp">object</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The object being observed by this data source, if found.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">object</span><span class="p">:</span> <span class="kt"><a href="../Protocols/SingleDataSource.html#/s:8Flapjack16SingleDataSourceP9ModelTypeQa">ModelType</a></span><span class="p">?</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/oreillymedia/flapjack/tree/master/Sources/Core/SingleDataSource.swift#L23">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:8Flapjack16SingleDataSourceP10hasFetchedSbvp"></a>
<a name="//apple_ref/swift/Property/hasFetched" class="dashAnchor"></a>
<a class="token" href="#/s:8Flapjack16SingleDataSourceP10hasFetchedSbvp">hasFetched</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>If <code>true</code>, at least one fetch has been attempted.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">hasFetched</span><span class="p">:</span> <span class="kt">Bool</span> <span class="p">{</span> <span class="k">get</span> <span class="p">}</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/oreillymedia/flapjack/tree/master/Sources/Core/SingleDataSource.swift#L25">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:8Flapjack16SingleDataSourceP8onChangey9ModelTypeQzSgcSgvp"></a>
<a name="//apple_ref/swift/Property/onChange" class="dashAnchor"></a>
<a class="token" href="#/s:8Flapjack16SingleDataSourceP8onChangey9ModelTypeQzSgcSgvp">onChange</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A closure to be called whenever a change is detected to the object being observed.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="k">var</span> <span class="nv">onChange</span><span class="p">:</span> <span class="p">((</span><span class="kt"><a href="../Protocols/SingleDataSource.html#/s:8Flapjack16SingleDataSourceP9ModelTypeQa">ModelType</a></span><span class="p">?)</span> <span class="o">-></span> <span class="kt">Void</span><span class="p">)?</span> <span class="p">{</span> <span class="k">get</span> <span class="k">set</span> <span class="p">}</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/oreillymedia/flapjack/tree/master/Sources/Core/SingleDataSource.swift#L27">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:8Flapjack16SingleDataSourceP14startListeningyyF"></a>
<a name="//apple_ref/swift/Method/startListening()" class="dashAnchor"></a>
<a class="token" href="#/s:8Flapjack16SingleDataSourceP14startListeningyyF">startListening()</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Tells the data source to perform its operation and retain the matching result.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">startListening</span><span class="p">()</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/oreillymedia/flapjack/tree/master/Sources/Core/SingleDataSource.swift#L30">Show on GitHub</a>
</div>
</section>
</div>
</li>
</ul>
</div>
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<p>© 2023 <a class="link" href="https://oreilly.com" target="_blank" rel="external noopener">O'Reilly Media, Inc.</a>. All rights reserved. (Last updated: 2023-05-18)</p>
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