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<a href="#updatesfilter" class="md-nav__link">
UpdatesFilter
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SimpleUpdatesFilter
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FlowsUpdatesFilter
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Combining of flows
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Types filtering
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<h1 id="updates-filters">Updates filters<a class="headerlink" href="#updates-filters" title="Permanent link">&para;</a></h1>
<p>Due to the fact, that anyway you will get updates in one format (<code>Update</code> objects), some time ago was solved to create one point of updates filters for more usefull way of updates handling</p>
<h2 id="updatesfilter">UpdatesFilter<a class="headerlink" href="#updatesfilter" title="Permanent link">&para;</a></h2>
<p><code>UpdatesFilter</code> currently have two properties:</p>
<ul>
<li><code>asUpdateReceiver</code> - required to represent this filter as common updates receiver which able to get any <code>Update</code></li>
<li><code>allowedUpdates</code> - required to determine, which updates are usefull for this filter</li>
</ul>
<p>Anyway, this filter can&rsquo;t work with updates by itself. For retrieving updates you should pass this filter to some of getting updates functions (<a href="long-polling">long polling</a> or <a href="webhooks.html">webhooks</a>).</p>
<h3 id="simpleupdatesfilter">SimpleUpdatesFilter<a class="headerlink" href="#simpleupdatesfilter" title="Permanent link">&para;</a></h3>
<p><code>SimpleUpdatesFilter</code> is a simple variant of filters. It have a lot of <code>UpdateReceiver</code> properties which can be set up on creating of this object. For example, if you wish to get messages from chats (but not from channels), you can use next snippet:</p>
<pre><code class="language-kotlin">SimpleUpdatesFilter {
println(it)
}
</code></pre>
<h3 id="flowsupdatesfilter">FlowsUpdatesFilter<a class="headerlink" href="#flowsupdatesfilter" title="Permanent link">&para;</a></h3>
<p>A little bit more modern way is to use <code>FlowsUpdatesFilter</code>. It is very powerfull API of Kotlin Coroutines Flows, built-in support of additional extensions for <code>FlowsUpdatesFilter</code> and <code>Flow&lt;...&gt;</code> receivers and opportunity to split one filter for as much receivers as you want. Filter creating example:</p>
<pre><code class="language-kotlin">val scope = CoroutineScope(Dispatchers.Default)
flowsUpdatesFilter {
messageFlow.onEach {
println(it)
}.launchIn(scope)
}
</code></pre>
<h4 id="combining-of-flows">Combining of flows<a class="headerlink" href="#combining-of-flows" title="Permanent link">&para;</a></h4>
<p>In cases you need not separate logic for handling of messages from channels and chats there are three ways to combine different flows into one:</p>
<ul>
<li>Standard <code>plus</code> operation and handling of different flows:</li>
</ul>
<pre><code class="language-kotlin">flowsUpdatesFilter {
(messageFlow + channelPostFlow).onEach {
println(it) // will be printed each message update from channels and chats both
}.launchIn(scope)
}
</code></pre>
<ul>
<li>TelegramBotAPI library support function <code>aggregateFlows</code>:</li>
</ul>
<pre><code class="language-kotlin">flowsUpdatesFilter {
aggregateFlows(
scope,
messageFlow,
channelPostFlow
).onEach {
println(it) // will be printed each message update from channels and chats both
}.launchIn(scope)
}
</code></pre>
<ul>
<li><code>FlowsUpdatesFilter</code> extensions:</li>
</ul>
<pre><code class="language-kotlin">flowsUpdatesFilter {
allSentMessagesFlow.onEach {
println(it) // will be printed each message update from channels and chats both
}.launchIn(scope)
}
</code></pre>
<h4 id="types-filtering">Types filtering<a class="headerlink" href="#types-filtering" title="Permanent link">&para;</a></h4>
<p><code>FlowsUpdatesFilter</code> have a lot of extensions for messages types filtering:</p>
<pre><code class="language-kotlin">flowsUpdatesFilter {
textMessages(scope).onEach {
println(it) // will be printed each message from channels and chats both with content only `TextContent`
}.launchIn(scope)
}
</code></pre>
<p>The same things were created for media groups:</p>
<pre><code class="language-kotlin">flowsUpdatesFilter {
mediaGroupMessages(scope).onEach {
println(it) // will be printed each media group messages list from both channels and chats without filtering of content
}.launchIn(scope)
mediaGroupPhotosMessages(scope).onEach {
println(it) // will be printed each media group messages list from both channels and chats with PhotoContent only
}.launchIn(scope)
mediaGroupVideosMessages(scope).onEach {
println(it) // will be printed each media group messages list from both channels and chats with VideoContent only
}.launchIn(scope)
}
</code></pre>
<p>Besides, there is an opportunity to avoid separation on media groups and common messages and receive photos and videos content in one flow:</p>
<pre><code class="language-kotlin">flowsUpdatesFilter {
sentMessagesWithMediaGroups(scope).onEach {
println(it) // will be printed each message including each separated media group message from both channels and chats without filtering of content
}.launchIn(scope)
photoMessagesWithMediaGroups(scope).onEach {
println(it) // will be printed each message including each separated media group message from both channels and chats with PhotoContent only
}.launchIn(scope)
videoMessagesWithMediaGroups(scope).onEach {
println(it) // will be printed each message including each separated media group message from both channels and chats with VideoContent only
}.launchIn(scope)
}
</code></pre>
<h2 id="see-also">See also<a class="headerlink" href="#see-also" title="Permanent link">&para;</a></h2>
<ul>
<li><a href="long-polling.html">Long polling</a></li>
<li><a href="webhooks.html">Webhooks</a></li>
</ul>
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