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| <div class="subTitle">org.apache.beam.sdk.schemas.transforms</div> |
| <h2 title="Class Filter" class="title">Class Filter</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <li>org.apache.beam.sdk.schemas.transforms.Filter</li> |
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| <pre><a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a>(<a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html#value--">value</a>=<a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.Kind.html#SCHEMAS">SCHEMAS</a>) |
| public class <span class="typeNameLabel">Filter</span> |
| extends java.lang.Object</pre> |
| <div class="block">A <a href="../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> for filtering a collection of schema types. |
| |
| <p>Separate Predicates can be registered for different schema fields, and the result is allowed |
| to pass if all predicates return true. The output type is the same as the input type. |
| |
| <p>For example, consider the following schema type: |
| |
| <pre><code> |
| public class Location { |
| public double latitude; |
| public double longitude; |
| } |
| </code></pre> |
| |
| In order to examine only locations in south Manhattan, you would write: |
| |
| <pre><code> |
| PCollection<Location> locations = readLocations(); |
| locations.apply(Filter |
| .whereFieldName("latitude", lat -> lat < 40.720 && lat > 40.699) |
| .whereFieldName("longitude", long -> long < -73.969 && long > -74.747)); |
| </code></pre> |
| |
| Predicates that require examining multiple fields at once are also supported. For example, |
| consider the following class representing a user account: |
| |
| <pre><code> |
| class UserAccount { |
| public double spendOnBooks; |
| public double spendOnMovies; |
| ... |
| } |
| </code></pre> |
| |
| Say you want to examine only users whos total spend is above $100. You could write: |
| |
| <pre><code> |
| PCollection<UserAccount> users = readUsers(); |
| users.apply(Filter |
| .whereFieldNames(Lists.newArrayList("spendOnBooks", "spendOnMovies"), |
| row -> return row.getDouble("spendOnBooks") + row.getDouble("spendOnMovies") > 100.00)); |
| </code></pre></div> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Filter.Inner.html" title="class in org.apache.beam.sdk.schemas.transforms">Filter.Inner</a><<a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Filter.Inner.html" title="type parameter in Filter.Inner">T</a>></span></code> |
| <div class="block">Implementation of the filter.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Filter.html#Filter--">Filter</a></span>()</code> </td> |
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| <td class="colFirst"><code>static <T> <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Filter.Inner.html" title="class in org.apache.beam.sdk.schemas.transforms">Filter.Inner</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Filter.html#create--">create</a></span>()</code> </td> |
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| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
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| <pre>public Filter()</pre> |
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| <pre>public static <T> <a href="../../../../../../org/apache/beam/sdk/schemas/transforms/Filter.Inner.html" title="class in org.apache.beam.sdk.schemas.transforms">Filter.Inner</a><T> create()</pre> |
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