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| <h2 title="Class ViewFn" class="title">Class ViewFn<PrimitiveViewT,ViewT></h2> |
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| <li>java.lang.Object</li> |
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| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>PrimitiveViewT</code> - the type of the underlying primitive view required</dd> |
| <dd><code>ViewT</code> - the type of the value(s) accessible via this <a href="../../../../../org/apache/beam/sdk/values/PCollectionView.html" title="interface in org.apache.beam.sdk.values"><code>PCollectionView</code></a></dd> |
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| <dd><a href="../../../../../org/apache/beam/sdk/values/PCollectionViews.IterableViewFn.html" title="class in org.apache.beam.sdk.values">PCollectionViews.IterableViewFn</a>, <a href="../../../../../org/apache/beam/sdk/values/PCollectionViews.ListViewFn.html" title="class in org.apache.beam.sdk.values">PCollectionViews.ListViewFn</a>, <a href="../../../../../org/apache/beam/sdk/values/PCollectionViews.MapViewFn.html" title="class in org.apache.beam.sdk.values">PCollectionViews.MapViewFn</a>, <a href="../../../../../org/apache/beam/sdk/values/PCollectionViews.MultimapViewFn.html" title="class in org.apache.beam.sdk.values">PCollectionViews.MultimapViewFn</a>, <a href="../../../../../org/apache/beam/sdk/values/PCollectionViews.SingletonViewFn.html" title="class in org.apache.beam.sdk.values">PCollectionViews.SingletonViewFn</a></dd> |
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| <pre><a href="../../../../../org/apache/beam/sdk/annotations/Internal.html" title="annotation in org.apache.beam.sdk.annotations">@Internal</a> |
| public abstract class <span class="typeNameLabel">ViewFn<PrimitiveViewT,ViewT></span> |
| extends java.lang.Object |
| implements java.io.Serializable</pre> |
| <div class="block"><b><i>For internal use only; no backwards-compatibility guarantees.</i></b> |
| |
| <p>A function to adapt a primitive "view" of a <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> - some materialization |
| specified in the Beam model and implemented by the runner - to a user-facing view type for side |
| input. |
| |
| <p>Both the underlying primitive view and the user-facing view are immutable. |
| |
| <p>The most common case is using the <a href="../../../../../org/apache/beam/sdk/transforms/View.html" title="class in org.apache.beam.sdk.transforms"><code>View</code></a> transforms to prepare a <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> for |
| use as a side input to <a href="../../../../../org/apache/beam/sdk/transforms/ParDo.html" title="class in org.apache.beam.sdk.transforms"><code>ParDo</code></a>. See <a href="../../../../../org/apache/beam/sdk/transforms/View.html#asSingleton--"><code>View.asSingleton()</code></a>, <a href="../../../../../org/apache/beam/sdk/transforms/View.html#asIterable--"><code>View.asIterable()</code></a>, |
| and <a href="../../../../../org/apache/beam/sdk/transforms/View.html#asMap--"><code>View.asMap()</code></a> for more detail on specific views available in the SDK.</div> |
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| <td class="colFirst"><code>abstract <a href="../../../../../org/apache/beam/sdk/transforms/ViewFn.html" title="type parameter in ViewFn">ViewT</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ViewFn.html#apply-PrimitiveViewT-">apply</a></span>(<a href="../../../../../org/apache/beam/sdk/transforms/ViewFn.html" title="type parameter in ViewFn">PrimitiveViewT</a> primitiveViewT)</code> |
| <div class="block">A function to adapt a primitive view type to a desired view type.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>abstract <a href="../../../../../org/apache/beam/sdk/transforms/Materialization.html" title="interface in org.apache.beam.sdk.transforms">Materialization</a><<a href="../../../../../org/apache/beam/sdk/transforms/ViewFn.html" title="type parameter in ViewFn">PrimitiveViewT</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ViewFn.html#getMaterialization--">getMaterialization</a></span>()</code> |
| <div class="block">Gets the materialization of this <a href="../../../../../org/apache/beam/sdk/transforms/ViewFn.html" title="class in org.apache.beam.sdk.transforms"><code>ViewFn</code></a>.</div> |
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| <h4>ViewFn</h4> |
| <pre>public ViewFn()</pre> |
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| <h4>getMaterialization</h4> |
| <pre>public abstract <a href="../../../../../org/apache/beam/sdk/transforms/Materialization.html" title="interface in org.apache.beam.sdk.transforms">Materialization</a><<a href="../../../../../org/apache/beam/sdk/transforms/ViewFn.html" title="type parameter in ViewFn">PrimitiveViewT</a>> getMaterialization()</pre> |
| <div class="block">Gets the materialization of this <a href="../../../../../org/apache/beam/sdk/transforms/ViewFn.html" title="class in org.apache.beam.sdk.transforms"><code>ViewFn</code></a>.</div> |
| </li> |
| </ul> |
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| </a><a name="apply-PrimitiveViewT-"> |
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| <h4>apply</h4> |
| <pre>public abstract <a href="../../../../../org/apache/beam/sdk/transforms/ViewFn.html" title="type parameter in ViewFn">ViewT</a> apply(<a href="../../../../../org/apache/beam/sdk/transforms/ViewFn.html" title="type parameter in ViewFn">PrimitiveViewT</a> primitiveViewT)</pre> |
| <div class="block">A function to adapt a primitive view type to a desired view type.</div> |
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