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<li class="toctree-l1"><a class="reference internal" href="../01_Concept_of_the_extractor/">Concept of the Extractor</a>
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<li class="toctree-l1 current"><a class="reference internal current" href="./">Concept of the LinkHandler</a>
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<li class="toctree-l2"><a class="reference internal" href="#important-notes-about-linkhandler">Important notes about LinkHandler</a>
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<li class="toctree-l2"><a class="reference internal" href="#listlinkhandler-and-searchqueryhandler">ListLinkHandler and SearchQueryHandler</a>
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<li class="toctree-l3"><a class="reference internal" href="#searchqueryhandler">SearchQueryHandler</a>
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<h1 id="concept-of-the-linkhandler">Concept of the LinkHandler</h1>
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<p>The <a href="https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/LinkHandler.html">LinkHandler</a>
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represent links to resources like videos, search requests, channels, etc.
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The idea is that a video can have multiple links pointing to it, but it has
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one unique ID that represents it, like this example:</p>
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<p><a href="https://www.youtube.com/watch?v=oHg5SJYRHA0">oHg5SJYRHA0</a> can be represented as:</p>
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<li><a href="https://www.youtube.com/watch?v=oHg5SJYRHA0">https://www.youtube.com/watch?v=oHg5SJYRHA0</a> (the default URL for YouTube)</li>
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<li><a href="https://youtu.be/oHg5SJYRHA0">https://youtu.be/oHg5SJYRHA0</a> (the shortened link)</li>
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<li><a href="https://m.youtube.com/watch?v=oHg5SJYRHA0">https://m.youtube.com/watch?v=oHg5SJYRHA0</a> (the link for mobile devices)</li>
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</ul>
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<h3 id="important-notes-about-linkhandler">Important notes about LinkHandler</h3>
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<ul>
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<li>A simple <code>LinkHandler</code> will contain the default URL, the ID, and the original URL.</li>
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<li><code>LinkHandler</code>s are read only.</li>
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<li><code>LinkHandler</code>s are also used to determine which part of the extractor can handle a certain link.</li>
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<li>In order to get one you must either call
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<a href="https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/LinkHandlerFactory.html#fromUrl-java.lang.String-">fromUrl()</a> or <a href="https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/LinkHandlerFactory.html#fromId-java.lang.String-">fromId()</a> of the the corresponding <code>LinkHandlerFactory</code>.</li>
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<li>Every type of resource has its own <code>LinkHandlerFactory</code>. Eg. YoutubeStreamLinkHandler, YoutubeChannelLinkHandler, etc.</li>
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</ul>
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<h3 id="usage">Usage</h3>
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<p>The typical usage for obtaining a LinkHandler would look like this:</p>
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<pre><code class="java">LinkHandlerFactory myLinkHandlerFactory = new MyStreamLinkHandlerFactory();
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LinkHandler myVideo = myLinkHandlerFactory.fromUrl("https://my.service.com/the_video");
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</code></pre>
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<h3 id="implementation">Implementation</h3>
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<p>In order to use LinkHandler for your service, you must override the appropriate LinkHandlerFactory. eg:</p>
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<pre><code class="java">class MyStreamLinkHandlerFactory extends LinkHandlerFactory {
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@Override
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public String getId(String url) throws ParsingException {
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// Return the ID based on the URL.
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}
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@Override
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public String getUrl(String id) throws ParsingException {
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// Return the URL based on the ID given.
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}
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@Override
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public boolean onAcceptUrl(String url) throws ParsingException {
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// Return true if this LinkHandlerFactory can handle this type of link.
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}
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}
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</code></pre>
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<h3 id="listlinkhandler-and-searchqueryhandler">ListLinkHandler and SearchQueryHandler</h3>
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<p>List based resources, like channels and playlists, can be sorted and filtered.
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Therefore these type of resources don't just use a LinkHandler, but a class called
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<a href="https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/ListLinkHandler.html">ListLinkHandler</a>,
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which inherits from LinkHandler and adds the field <a href="https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/ListLinkHandler.html#contentFilters">ContentFilter</a>,
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which is used to filter by resource type, like stream or playlist, and
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<a href="https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/ListLinkHandler.html#sortFilter">SortFilter</a>,
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which is used to sort by name, date, or view count.</p>
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<p><strong>!!ATTENTION!!</strong> Be careful when you implement a content filter: No selected filter equals all filters selected. If your get an empty content filter list in your extractor, make sure you return everything. By all means, use "if"
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statements like <code>contentFilter.contains("video") || contentFilter.isEmpty()</code>.</p>
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<p>ListLinkHandler are also created by overriding the <a href="https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/ListLinkHandlerFactory.html">ListLinkHandlerFactory</a>
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additionally to the abstract methods this factory inherits from the LinkHandlerFactory you can override
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<a href="https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/ListLinkHandlerFactory.html#getAvailableContentFilter--">getAvailableContentFilter()</a>
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and <a href="https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/ListLinkHandlerFactory.html#getAvailableSortFilter--">getAvailableSortFilter()</a>.
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Through these you can tell the front end which kind of filter your service supports.</p>
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<h4 id="searchqueryhandler">SearchQueryHandler</h4>
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<p>You cannot point to a search request with an ID like you point to a playlist or a channel, simply because one and the
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same search request might have a different outcome depending on the country or the time you send the request. This is
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why the idea of an "ID" is replaced by a "SearchString" in the <a href="https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/SearchQueryHandler.html">SearchQueryHandler</a>.
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These work like regular ListLinkHandler, except that you don't have to implement the methods <code>onAcceptUrl()</code>
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and <code>getId()</code> when overriding <a href="https://teamnewpipe.github.io/NewPipeExtractor/javadoc/org/schabi/newpipe/extractor/linkhandler/SearchQueryHandlerFactory.html">SearchQueryHandlerFactory</a>.</p>
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