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| <div class="subTitle">org.apache.beam.sdk.transforms.windowing</div> |
| <h2 title="Class WindowFn" class="title">Class WindowFn<T,W extends <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">BoundedWindow</a>></h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.beam.sdk.transforms.windowing.WindowFn<T,W></li> |
| </ul> |
| </li> |
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| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - type of elements being windowed</dd> |
| <dd><code>W</code> - <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>BoundedWindow</code></a> subclass used to represent the windows used by this <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFn</code></a></dd> |
| </dl> |
| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd>java.io.Serializable, <a href="../../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></dd> |
| </dl> |
| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/InvalidWindows.html" title="class in org.apache.beam.sdk.transforms.windowing">InvalidWindows</a>, <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/NonMergingWindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing">NonMergingWindowFn</a>, <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/Sessions.html" title="class in org.apache.beam.sdk.transforms.windowing">Sessions</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public abstract class <span class="typeNameLabel">WindowFn<T,W extends <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">BoundedWindow</a>></span> |
| extends java.lang.Object |
| implements java.io.Serializable, <a href="../../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></pre> |
| <div class="block">The argument to the <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/Window.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>Window</code></a> transform used to assign elements into windows and to |
| determine how windows are merged. See <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/Window.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>Window</code></a> for more information on how <code>WindowFn</code>s are used and for a library of predefined <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFns</code></a>. |
| |
| <p>Users will generally want to use the predefined <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFns</code></a>, but it is also |
| possible to create new subclasses. |
| |
| <p>To create a custom <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFn</code></a>, inherit from this class and override all required |
| methods. If no merging is required, inherit from <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/NonMergingWindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>NonMergingWindowFn</code></a> instead. If no |
| merging is required and each element is assigned to a single window, inherit from <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/PartitioningWindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>PartitioningWindowFn</code></a>. Inheriting from the most specific subclass will enable more optimizations |
| in the runner.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../serialized-form.html#org.apache.beam.sdk.transforms.windowing.WindowFn">Serialized Form</a></dd> |
| </dl> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.AssignContext.html" title="class in org.apache.beam.sdk.transforms.windowing">WindowFn.AssignContext</a></span></code> |
| <div class="block">Information available when running <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#assignWindows-org.apache.beam.sdk.transforms.windowing.WindowFn.AssignContext-"><code>assignWindows(org.apache.beam.sdk.transforms.windowing.WindowFn<T, W>.AssignContext)</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.MergeContext.html" title="class in org.apache.beam.sdk.transforms.windowing">WindowFn.MergeContext</a></span></code> |
| <div class="block">Information available when running <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#mergeWindows-org.apache.beam.sdk.transforms.windowing.WindowFn.MergeContext-"><code>mergeWindows(org.apache.beam.sdk.transforms.windowing.WindowFn<T, W>.MergeContext)</code></a>.</div> |
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| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#WindowFn--">WindowFn</a></span>()</code> </td> |
| </tr> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#assignsToOneWindow--">assignsToOneWindow</a></span>()</code> |
| <div class="block">Returns true if this <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFn</code></a> always assigns an element to exactly one window.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>abstract java.util.Collection<<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="type parameter in WindowFn">W</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#assignWindows-org.apache.beam.sdk.transforms.windowing.WindowFn.AssignContext-">assignWindows</a></span>(<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.AssignContext.html" title="class in org.apache.beam.sdk.transforms.windowing">WindowFn.AssignContext</a> c)</code> |
| <div class="block">Given a timestamp and element, returns the set of windows into which it should be placed.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>abstract <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html" title="class in org.apache.beam.sdk.transforms.windowing">WindowMappingFn</a><<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="type parameter in WindowFn">W</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#getDefaultWindowMappingFn--">getDefaultWindowMappingFn</a></span>()</code> |
| <div class="block">Returns the default <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowMappingFn</code></a> to use to map main input windows to side input |
| windows.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="https://static.javadoc.io/joda-time/joda-time/2.10.1/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#getOutputTime-org.joda.time.Instant-W-">getOutputTime</a></span>(<a href="https://static.javadoc.io/joda-time/joda-time/2.10.1/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a> inputTimestamp, |
| <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="type parameter in WindowFn">W</a> window)</code> |
| <div class="block">Returns the output timestamp to use for data depending on the given <code>inputTimestamp</code> in |
| the specified <code>window</code>.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/beam/sdk/values/TypeDescriptor.html" title="class in org.apache.beam.sdk.values">TypeDescriptor</a><<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="type parameter in WindowFn">W</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#getWindowTypeDescriptor--">getWindowTypeDescriptor</a></span>()</code> |
| <div class="block">Returns a <a href="../../../../../../org/apache/beam/sdk/values/TypeDescriptor.html" title="class in org.apache.beam.sdk.values"><code>TypeDescriptor</code></a> capturing what is known statically about the window type of |
| this <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFn</code></a> instance's most-derived class.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>abstract boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#isCompatible-org.apache.beam.sdk.transforms.windowing.WindowFn-">isCompatible</a></span>(<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing">WindowFn</a><?,?> other)</code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="block"><span class="deprecationComment">please override verifyCompatibility to throw a useful error message; we will remove |
| isCompatible at version 3.0.0</span></div> |
| </div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#isNonMerging--">isNonMerging</a></span>()</code> |
| <div class="block">Returns true if this <code>WindowFn</code> never needs to merge any windows.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>abstract void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#mergeWindows-org.apache.beam.sdk.transforms.windowing.WindowFn.MergeContext-">mergeWindows</a></span>(<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.MergeContext.html" title="class in org.apache.beam.sdk.transforms.windowing">WindowFn.MergeContext</a> c)</code> |
| <div class="block">Does whatever merging of windows is necessary.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a></span>(<a href="../../../../../../org/apache/beam/sdk/transforms/display/DisplayData.Builder.html" title="interface in org.apache.beam.sdk.transforms.display">DisplayData.Builder</a> builder)</code> |
| <div class="block">Register display data for the given transform or component.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#verifyCompatibility-org.apache.beam.sdk.transforms.windowing.WindowFn-">verifyCompatibility</a></span>(<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing">WindowFn</a><?,?> other)</code> |
| <div class="block">Throw <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/IncompatibleWindowException.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>IncompatibleWindowException</code></a> if this WindowFn does not perform the same merging as |
| the given $<code>WindowFn</code>.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>abstract <a href="../../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="type parameter in WindowFn">W</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html#windowCoder--">windowCoder</a></span>()</code> |
| <div class="block">Returns the <a href="../../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders"><code>Coder</code></a> used for serializing the windows used by this windowFn.</div> |
| </td> |
| </tr> |
| </table> |
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| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
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| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="WindowFn--"> |
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| <h4>WindowFn</h4> |
| <pre>public WindowFn()</pre> |
| </li> |
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| <h3>Method Detail</h3> |
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| <h4>assignWindows</h4> |
| <pre>public abstract java.util.Collection<<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="type parameter in WindowFn">W</a>> assignWindows(<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.AssignContext.html" title="class in org.apache.beam.sdk.transforms.windowing">WindowFn.AssignContext</a> c) |
| throws java.lang.Exception</pre> |
| <div class="block">Given a timestamp and element, returns the set of windows into which it should be placed.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.Exception</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="mergeWindows-org.apache.beam.sdk.transforms.windowing.WindowFn.MergeContext-"> |
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| </a> |
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| <h4>mergeWindows</h4> |
| <pre>public abstract void mergeWindows(<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.MergeContext.html" title="class in org.apache.beam.sdk.transforms.windowing">WindowFn.MergeContext</a> c) |
| throws java.lang.Exception</pre> |
| <div class="block">Does whatever merging of windows is necessary. |
| |
| <p>See <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/MergeOverlappingIntervalWindows.html#mergeWindows-org.apache.beam.sdk.transforms.windowing.WindowFn.MergeContext-"><code>MergeOverlappingIntervalWindows.mergeWindows(org.apache.beam.sdk.transforms.windowing.WindowFn<?, org.apache.beam.sdk.transforms.windowing.IntervalWindow>.MergeContext)</code></a> for an example of how to override |
| this method.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.Exception</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="isCompatible-org.apache.beam.sdk.transforms.windowing.WindowFn-"> |
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| <h4>isCompatible</h4> |
| <pre>@Deprecated |
| public abstract boolean isCompatible(<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing">WindowFn</a><?,?> other)</pre> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> <span class="deprecationComment">please override verifyCompatibility to throw a useful error message; we will remove |
| isCompatible at version 3.0.0</span></div> |
| <div class="block">Returns whether this performs the same merging as the given <code>WindowFn</code>.</div> |
| </li> |
| </ul> |
| <a name="verifyCompatibility-org.apache.beam.sdk.transforms.windowing.WindowFn-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>verifyCompatibility</h4> |
| <pre>public void verifyCompatibility(<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing">WindowFn</a><?,?> other) |
| throws <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/IncompatibleWindowException.html" title="class in org.apache.beam.sdk.transforms.windowing">IncompatibleWindowException</a></pre> |
| <div class="block">Throw <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/IncompatibleWindowException.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>IncompatibleWindowException</code></a> if this WindowFn does not perform the same merging as |
| the given $<code>WindowFn</code>.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/IncompatibleWindowException.html" title="class in org.apache.beam.sdk.transforms.windowing">IncompatibleWindowException</a></code> - if compared WindowFns are not compatible.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="windowCoder--"> |
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| </a> |
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| <h4>windowCoder</h4> |
| <pre>public abstract <a href="../../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="type parameter in WindowFn">W</a>> windowCoder()</pre> |
| <div class="block">Returns the <a href="../../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders"><code>Coder</code></a> used for serializing the windows used by this windowFn.</div> |
| </li> |
| </ul> |
| <a name="getDefaultWindowMappingFn--"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>getDefaultWindowMappingFn</h4> |
| <pre>public abstract <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html" title="class in org.apache.beam.sdk.transforms.windowing">WindowMappingFn</a><<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="type parameter in WindowFn">W</a>> getDefaultWindowMappingFn()</pre> |
| <div class="block">Returns the default <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowMappingFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowMappingFn</code></a> to use to map main input windows to side input |
| windows. This should accept arbitrary main input windows, and produce a <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>BoundedWindow</code></a> |
| that can be produced by this <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFn</code></a>.</div> |
| </li> |
| </ul> |
| <a name="getOutputTime-org.joda.time.Instant-org.apache.beam.sdk.transforms.windowing.BoundedWindow-"> |
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| </a><a name="getOutputTime-org.joda.time.Instant-W-"> |
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| <h4>getOutputTime</h4> |
| <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#OUTPUT_TIME">OUTPUT_TIME</a>) |
| public <a href="https://static.javadoc.io/joda-time/joda-time/2.10.1/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a> getOutputTime(<a href="https://static.javadoc.io/joda-time/joda-time/2.10.1/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a> inputTimestamp, |
| <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="type parameter in WindowFn">W</a> window)</pre> |
| <div class="block">Returns the output timestamp to use for data depending on the given <code>inputTimestamp</code> in |
| the specified <code>window</code>. |
| |
| <p>The result of this method must be between <code>inputTimestamp</code> and <code>window.maxTimestamp()</code> (inclusive on both sides). |
| |
| <p>This function must be monotonic across input timestamps. Specifically, if <code>A < B</code>, |
| then <code>getOutputTime(A, window) <= getOutputTime(B, window)</code>. |
| |
| <p>For a <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFn</code></a> that doesn't produce overlapping windows, this can (and typically |
| should) just return <code>inputTimestamp</code>. In the presence of overlapping windows, it is |
| suggested that the result in later overlapping windows is past the end of earlier windows so |
| that the later windows don't prevent the watermark from progressing past the end of the earlier |
| window.</div> |
| </li> |
| </ul> |
| <a name="isNonMerging--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isNonMerging</h4> |
| <pre>public boolean isNonMerging()</pre> |
| <div class="block">Returns true if this <code>WindowFn</code> never needs to merge any windows.</div> |
| </li> |
| </ul> |
| <a name="assignsToOneWindow--"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>assignsToOneWindow</h4> |
| <pre>public boolean assignsToOneWindow()</pre> |
| <div class="block">Returns true if this <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFn</code></a> always assigns an element to exactly one window. |
| |
| <p>If this varies per-element, or cannot be determined, conservatively return false. |
| |
| <p>By default, returns false.</div> |
| </li> |
| </ul> |
| <a name="getWindowTypeDescriptor--"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>getWindowTypeDescriptor</h4> |
| <pre>public <a href="../../../../../../org/apache/beam/sdk/values/TypeDescriptor.html" title="class in org.apache.beam.sdk.values">TypeDescriptor</a><<a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="type parameter in WindowFn">W</a>> getWindowTypeDescriptor()</pre> |
| <div class="block">Returns a <a href="../../../../../../org/apache/beam/sdk/values/TypeDescriptor.html" title="class in org.apache.beam.sdk.values"><code>TypeDescriptor</code></a> capturing what is known statically about the window type of |
| this <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFn</code></a> instance's most-derived class. |
| |
| <p>In the normal case of a concrete <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFn</code></a> subclass with no generic type parameters |
| of its own (including anonymous inner classes), this will be a complete non-generic type.</div> |
| </li> |
| </ul> |
| <a name="populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-"> |
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| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>populateDisplayData</h4> |
| <pre>public void populateDisplayData(<a href="../../../../../../org/apache/beam/sdk/transforms/display/DisplayData.Builder.html" title="interface in org.apache.beam.sdk.transforms.display">DisplayData.Builder</a> builder)</pre> |
| <div class="block">Register display data for the given transform or component. |
| |
| <p><code>populateDisplayData(DisplayData.Builder)</code> is invoked by Pipeline runners to collect |
| display data via <a href="../../../../../../org/apache/beam/sdk/transforms/display/DisplayData.html#from-org.apache.beam.sdk.transforms.display.HasDisplayData-"><code>DisplayData.from(HasDisplayData)</code></a>. Implementations may call <code>super.populateDisplayData(builder)</code> in order to register display data in the current namespace, |
| but should otherwise use <code>subcomponent.populateDisplayData(builder)</code> to use the namespace |
| of the subcomponent. |
| |
| <p>By default, does not register any display data. Implementors may override this method to |
| provide their own display data.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a></code> in interface <code><a href="../../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>builder</code> - The builder to populate with display data.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display"><code>HasDisplayData</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
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