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<div class="subTitle">org.apache.beam.sdk.transforms</div>
<h2 title="Class WithTimestamps" class="title">Class WithTimestamps&lt;T&gt;</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">org.apache.beam.sdk.transforms.PTransform</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;T&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;T&gt;&gt;</li>
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<ul class="inheritance">
<li>org.apache.beam.sdk.transforms.WithTimestamps&lt;T&gt;</li>
</ul>
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<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>
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<pre>public class <span class="typeNameLabel">WithTimestamps&lt;T&gt;</span>
extends <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;T&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;T&gt;&gt;</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 assigning timestamps to all the elements of a <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a>.
<p>Timestamps are used to assign <a href="../../../../../org/apache/beam/sdk/transforms/windowing/BoundedWindow.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>Windows</code></a> to elements within the <a href="../../../../../org/apache/beam/sdk/transforms/windowing/Window.html#into-org.apache.beam.sdk.transforms.windowing.WindowFn-"><code>Window.into(org.apache.beam.sdk.transforms.windowing.WindowFn)</code></a> <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a>. Assigning
timestamps is useful when the input data set comes from a <a href="../../../../../org/apache/beam/sdk/io/Source.html" title="class in org.apache.beam.sdk.io"><code>Source</code></a> without implicit
timestamps (such as <a href="../../../../../org/apache/beam/sdk/io/TextIO.Read.html" title="class in org.apache.beam.sdk.io"><code>TextIO</code></a>).</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../serialized-form.html#org.apache.beam.sdk.transforms.WithTimestamps">Serialized Form</a></dd>
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<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#name">name</a></code></li>
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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><a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html" title="type parameter in WithTimestamps">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html#expand-org.apache.beam.sdk.values.PCollection-">expand</a></span>(<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html" title="type parameter in WithTimestamps">T</a>&gt;&nbsp;input)</code>
<div class="block">Override this method to specify how this <code>PTransform</code> should be expanded on the given
<code>InputT</code>.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html#getAllowedTimestampSkew--">getAllowedTimestampSkew</a></span>()</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">This method permits a to elements to be emitted behind the watermark. These
elements are considered late, and if behind the <a href="../../../../../org/apache/beam/sdk/transforms/windowing/Window.html#withAllowedLateness-org.joda.time.Duration-"><code>allowed lateness</code></a> of a downstream <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> may be silently dropped. See
https://issues.apache.org/jira/browse/BEAM-644 for details on a replacement.</span></div>
</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html" title="class in org.apache.beam.sdk.transforms">WithTimestamps</a>&lt;T&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html#of-org.apache.beam.sdk.transforms.SerializableFunction-">of</a></span>(<a href="../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms">SerializableFunction</a>&lt;T,<a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a>&gt;&nbsp;fn)</code>
<div class="block">For a <a href="../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms"><code>SerializableFunction</code></a> <code>fn</code> from <code>T</code> to <a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time"><code>Instant</code></a>, outputs a
<a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that takes an input <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection&lt;T&gt;</code></a> and outputs a
<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection&lt;T&gt;</code></a> containing every element <code>v</code> in the input where
each element is output with a timestamp obtained as the result of <code>fn.apply(v)</code>.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html" title="class in org.apache.beam.sdk.transforms">WithTimestamps</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html" title="type parameter in WithTimestamps">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html#withAllowedTimestampSkew-org.joda.time.Duration-">withAllowedTimestampSkew</a></span>(<a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a>&nbsp;allowedTimestampSkew)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;
<div class="block"><span class="deprecationComment">This method permits a to elements to be emitted behind the watermark. These
elements are considered late, and if behind the <a href="../../../../../org/apache/beam/sdk/transforms/windowing/Window.html#withAllowedLateness-org.joda.time.Duration-"><code>allowed lateness</code></a> of a downstream <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> may be silently dropped. See
https://issues.apache.org/jira/browse/BEAM-644 for details on a replacement.</span></div>
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<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#compose-org.apache.beam.sdk.transforms.SerializableFunction-">compose</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#compose-java.lang.String-org.apache.beam.sdk.transforms.SerializableFunction-">compose</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getAdditionalInputs--">getAdditionalInputs</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder--">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder-InputT-">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder-InputT-org.apache.beam.sdk.values.PCollection-">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getKindString--">getKindString</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getName--">getName</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#toString--">toString</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#validate-org.apache.beam.sdk.options.PipelineOptions-">validate</a></code></li>
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<pre>public static&nbsp;&lt;T&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html" title="class in org.apache.beam.sdk.transforms">WithTimestamps</a>&lt;T&gt;&nbsp;of(<a href="../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms">SerializableFunction</a>&lt;T,<a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a>&gt;&nbsp;fn)</pre>
<div class="block">For a <a href="../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms"><code>SerializableFunction</code></a> <code>fn</code> from <code>T</code> to <a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time"><code>Instant</code></a>, outputs a
<a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that takes an input <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection&lt;T&gt;</code></a> and outputs a
<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection&lt;T&gt;</code></a> containing every element <code>v</code> in the input where
each element is output with a timestamp obtained as the result of <code>fn.apply(v)</code>.
<p>If the input <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> elements have timestamps, the output timestamp for each
element must not be before the input element's timestamp minus the value of <a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html#getAllowedTimestampSkew--"><code>getAllowedTimestampSkew()</code></a>. If an output timestamp is before this time, the transform will
throw an <code>IllegalArgumentException</code> when executed. Use <a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html#withAllowedTimestampSkew-org.joda.time.Duration-"><code>withAllowedTimestampSkew(Duration)</code></a> to update the allowed skew.
<p>CAUTION: Use of <a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html#withAllowedTimestampSkew-org.joda.time.Duration-"><code>withAllowedTimestampSkew(Duration)</code></a> permits elements to be emitted
behind the watermark. These elements are considered late, and if behind the <a href="../../../../../org/apache/beam/sdk/transforms/windowing/Window.html#withAllowedLateness-org.joda.time.Duration-"><code>allowed lateness</code></a> of a downstream <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> may
be silently dropped. See https://issues.apache.org/jira/browse/BEAM-644 for details on a
replacement.
<p>Each output element will be in the same windows as the input element. If a new window based
on the new output timestamp is desired, apply a new instance of <a href="../../../../../org/apache/beam/sdk/transforms/windowing/Window.html#into-org.apache.beam.sdk.transforms.windowing.WindowFn-"><code>Window.into(WindowFn)</code></a>.
<p>This transform will fail at execution time with a <code>NullPointerException</code> if for any
input element the result of <code>fn.apply(v)</code> is <code>null</code>.
<p>Example of use in Java 8:
<pre><code>
PCollection&lt;Record&gt; timestampedRecords = records.apply(
WithTimestamps.of((Record rec) -&gt; rec.getInstant());
</code></pre></div>
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<h4>withAllowedTimestampSkew</h4>
<pre>@Deprecated
public&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html" title="class in org.apache.beam.sdk.transforms">WithTimestamps</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html" title="type parameter in WithTimestamps">T</a>&gt;&nbsp;withAllowedTimestampSkew(<a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a>&nbsp;allowedTimestampSkew)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">This method permits a to elements to be emitted behind the watermark. These
elements are considered late, and if behind the <a href="../../../../../org/apache/beam/sdk/transforms/windowing/Window.html#withAllowedLateness-org.joda.time.Duration-"><code>allowed lateness</code></a> of a downstream <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> may be silently dropped. See
https://issues.apache.org/jira/browse/BEAM-644 for details on a replacement.</span></div>
<div class="block">Return a new WithTimestamps like this one with updated allowed timestamp skew, which is the
maximum duration that timestamps can be shifted backward. Does not modify this object.
<p>The default value is <code>Duration.ZERO</code>, allowing timestamps to only be shifted into the
future. For infinite skew, use <code>new Duration(Long.MAX_VALUE)</code>.</div>
</li>
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<pre>@Deprecated
public&nbsp;<a href="https://static.javadoc.io/joda-time/joda-time/2.10.3/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a>&nbsp;getAllowedTimestampSkew()</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;<span class="deprecationComment">This method permits a to elements to be emitted behind the watermark. These
elements are considered late, and if behind the <a href="../../../../../org/apache/beam/sdk/transforms/windowing/Window.html#withAllowedLateness-org.joda.time.Duration-"><code>allowed lateness</code></a> of a downstream <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> may be silently dropped. See
https://issues.apache.org/jira/browse/BEAM-644 for details on a replacement.</span></div>
<div class="block">Returns the allowed timestamp skew duration, which is the maximum duration that timestamps can
be shifted backwards from the timestamp of the input element.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../org/apache/beam/sdk/transforms/DoFn.html#getAllowedTimestampSkew--"><code>DoFn.getAllowedTimestampSkew()</code></a></dd>
</dl>
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<h4>expand</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html" title="type parameter in WithTimestamps">T</a>&gt;&nbsp;expand(<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/WithTimestamps.html" title="type parameter in WithTimestamps">T</a>&gt;&nbsp;input)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#expand-InputT-">PTransform</a></code></span></div>
<div class="block">Override this method to specify how this <code>PTransform</code> should be expanded on the given
<code>InputT</code>.
<p>NOTE: This method should not be called directly. Instead apply the <code>PTransform</code> should
be applied to the <code>InputT</code> using the <code>apply</code> method.
<p>Composite transforms, which are defined in terms of other transforms, should return the
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