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<li class="toctree-l2"><a href="#basic-concept-of-the-extractor">Basic Concept of the Extractor</a></li>
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<li><a class="toctree-l3" href="#collectorextractor-pattern">Collector/Extractor pattern</a></li>
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<h1 id="basic-concept-of-the-extractor">Basic Concept of the Extractor</h1>
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<h2 id="collectorextractor-pattern">Collector/Extractor pattern</h2>
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<p>Before we can start coding our own service we need to understand the basic concept of the extractor. There is a pattern
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you will find all over the code. It is called the <strong>extractor/collector</strong> pattern. The idea behind this pattern is that
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the <a href="https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/Extractor.html">extractor</a>
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would produce single peaces of data, and the collector would take it and form usable data for the front end out of it.
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The collector also controls the parsing process, and takes care about error handling. So if the extractor fails at any
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point the collector will decide whether it should continue parsing or not. This requires the extractor to be made out of
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many small methods. One method for every data field the collector wants to have. The collectors are provided by NewPipe.
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You need to take care of the extractors.</p>
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<h3 id="usage-in-the-front-end">Usage in the front end</h3>
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<p>So typical call for retrieving data from a website would look like this:</p>
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<pre><code class="java">Info info;
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try {
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// Create a new Extractor with a given context provided as parameter.
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Extractor extractor = new Extractor(ome_meta_info);
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// Retrieves the data form extractor and builds info package.
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info = Info.getInfo(extractor);
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} catch(Exception e) {
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// handle errors when collector decided to break up extraction
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}
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</code></pre>
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