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| <h2 title="Interface Filter" class="title">Interface Filter</h2> |
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| <pre>public interface <span class="typeNameLabel">Filter</span> |
| extends <a href="../../../../../org/apache/storm/trident/operation/EachOperation.html" title="interface in org.apache.storm.trident.operation">EachOperation</a></pre> |
| <div class="block"><p>Filters take in a tuple as input and decide whether or not to keep that tuple or not.</p><p><p>If the <code>isKeep()</code> method of a Filter returns <code>false</code> for a tuple, that tuple will be filtered out of the Stream</p><p><p>### Configuration If your <code>Filter</code> implementation has configuration requirements, you will typically want to extend <a href="../../../../../org/apache/storm/trident/operation/BaseFilter.html" title="class in org.apache.storm.trident.operation"><code>BaseFilter</code></a> and override the <a href="../../../../../org/apache/storm/trident/operation/Operation.html#prepare-java.util.Map-org.apache.storm.trident.operation.TridentOperationContext-"><code>Operation.prepare(Map, |
| TridentOperationContext)</code></a> method to perform your custom initialization.</p></div> |
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| <dd><a href="../../../../../org/apache/storm/trident/Stream.html" title="class in org.apache.storm.trident"><code>Stream</code></a></dd> |
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| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/storm/trident/operation/Filter.html#isKeep-org.apache.storm.trident.tuple.TridentTuple-">isKeep</a></span>(<a href="../../../../../org/apache/storm/trident/tuple/TridentTuple.html" title="interface in org.apache.storm.trident.tuple">TridentTuple</a> tuple)</code> |
| <div class="block">Determines if a tuple should be filtered out of a stream.</div> |
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| <h4>isKeep</h4> |
| <pre>boolean isKeep(<a href="../../../../../org/apache/storm/trident/tuple/TridentTuple.html" title="interface in org.apache.storm.trident.tuple">TridentTuple</a> tuple)</pre> |
| <div class="block"><p>Determines if a tuple should be filtered out of a stream.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>tuple</code> - the tuple being evaluated</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>false</code> to drop the tuple, <code>true</code> to keep the tuple</dd> |
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