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<div class="subTitle">org.apache.beam.sdk.transforms</div>
<h2 title="Class MapElements" class="title">Class MapElements&lt;InputT,OutputT&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;? extends InputT&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;OutputT&gt;&gt;</li>
<li>
<ul class="inheritance">
<li>org.apache.beam.sdk.transforms.MapElements&lt;InputT,OutputT&gt;</li>
</ul>
</li>
</ul>
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</ul>
<div class="description">
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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>
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<pre>public class <span class="typeNameLabel">MapElements&lt;InputT,OutputT&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;? extends InputT&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;OutputT&gt;&gt;</pre>
<div class="block"><code>PTransform</code>s for mapping a simple function over 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>.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../serialized-form.html#org.apache.beam.sdk.transforms.MapElements">Serialized Form</a></dd>
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<h3>Fields inherited from class&nbsp;org.apache.beam.sdk.transforms.<a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a></h3>
<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#name">name</a></code></li>
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<h3>Method Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<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/MapElements.html" title="type parameter in MapElements">OutputT</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/MapElements.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;? extends <a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="type parameter in MapElements">InputT</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>static &lt;OutputT&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="class in org.apache.beam.sdk.transforms">MapElements</a>&lt;?,OutputT&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html#into-org.apache.beam.sdk.values.TypeDescriptor-">into</a></span>(<a href="../../../../../org/apache/beam/sdk/values/TypeDescriptor.html" title="class in org.apache.beam.sdk.values">TypeDescriptor</a>&lt;OutputT&gt;&nbsp;outputType)</code>
<div class="block">Returns a new <a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="class in org.apache.beam.sdk.transforms"><code>MapElements</code></a> transform with the given type descriptor for the output type,
but the mapping function yet to be specified using <a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html#via-org.apache.beam.sdk.transforms.SerializableFunction-"><code>via(SerializableFunction)</code></a>.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/MapElements.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>&nbsp;builder)</code>
<div class="block">Register display data for the given transform or component.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>&lt;NewInputT&gt;<br><a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="class in org.apache.beam.sdk.transforms">MapElements</a>&lt;NewInputT,<a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="type parameter in MapElements">OutputT</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html#via-org.apache.beam.sdk.transforms.Contextful-">via</a></span>(<a href="../../../../../org/apache/beam/sdk/transforms/Contextful.html" title="class in org.apache.beam.sdk.transforms">Contextful</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/Contextful.Fn.html" title="interface in org.apache.beam.sdk.transforms">Contextful.Fn</a>&lt;NewInputT,<a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="type parameter in MapElements">OutputT</a>&gt;&gt;&nbsp;fn)</code>
<div class="block">Like <a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html#via-org.apache.beam.sdk.transforms.SerializableFunction-"><code>via(SerializableFunction)</code></a>, but supports access to context, such as side inputs.</div>
</td>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>&lt;NewInputT&gt;<br><a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="class in org.apache.beam.sdk.transforms">MapElements</a>&lt;NewInputT,<a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="type parameter in MapElements">OutputT</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html#via-org.apache.beam.sdk.transforms.SerializableFunction-">via</a></span>(<a href="../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms">SerializableFunction</a>&lt;NewInputT,<a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="type parameter in MapElements">OutputT</a>&gt;&nbsp;fn)</code>
<div class="block">For a <code>SerializableFunction&lt;InputT, OutputT&gt;</code> <code>fn</code> and output type descriptor,
returns a <code>PTransform</code> that takes an input <code>PCollection&lt;InputT&gt;</code> and returns a
<code>PCollection&lt;OutputT&gt;</code> containing <code>fn.apply(v)</code> for every element <code>v</code> in the
input.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>static &lt;InputT,OutputT&gt;<br><a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="class in org.apache.beam.sdk.transforms">MapElements</a>&lt;InputT,OutputT&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html#via-org.apache.beam.sdk.transforms.SimpleFunction-">via</a></span>(<a href="../../../../../org/apache/beam/sdk/transforms/SimpleFunction.html" title="class in org.apache.beam.sdk.transforms">SimpleFunction</a>&lt;InputT,OutputT&gt;&nbsp;fn)</code>
<div class="block">For a <code>SimpleFunction&lt;InputT, OutputT&gt;</code> <code>fn</code>, returns a <code>PTransform</code> that
takes an input <code>PCollection&lt;InputT&gt;</code> and returns a <code>PCollection&lt;OutputT&gt;</code>
containing <code>fn.apply(v)</code> for every element <code>v</code> in the input.</div>
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<h3>Methods inherited from class&nbsp;org.apache.beam.sdk.transforms.<a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a></h3>
<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#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#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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<h4>via</h4>
<pre>public static&nbsp;&lt;InputT,OutputT&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="class in org.apache.beam.sdk.transforms">MapElements</a>&lt;InputT,OutputT&gt;&nbsp;via(<a href="../../../../../org/apache/beam/sdk/transforms/SimpleFunction.html" title="class in org.apache.beam.sdk.transforms">SimpleFunction</a>&lt;InputT,OutputT&gt;&nbsp;fn)</pre>
<div class="block">For a <code>SimpleFunction&lt;InputT, OutputT&gt;</code> <code>fn</code>, returns a <code>PTransform</code> that
takes an input <code>PCollection&lt;InputT&gt;</code> and returns a <code>PCollection&lt;OutputT&gt;</code>
containing <code>fn.apply(v)</code> for every element <code>v</code> in the input.
<p>This overload is intended primarily for use in Java 7. In Java 8, the overload <a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html#via-org.apache.beam.sdk.transforms.SerializableFunction-"><code>via(SerializableFunction)</code></a> supports use of lambda for greater concision.
<p>Example of use in Java 7:
<pre><code>
PCollection&lt;String&gt; words = ...;
PCollection&lt;Integer&gt; wordsPerLine = words.apply(MapElements.via(
new SimpleFunction&lt;String, Integer&gt;() {
public Integer apply(String word) {
return word.length();
}
}));
</code></pre></div>
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<h4>into</h4>
<pre>public static&nbsp;&lt;OutputT&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="class in org.apache.beam.sdk.transforms">MapElements</a>&lt;?,OutputT&gt;&nbsp;into(<a href="../../../../../org/apache/beam/sdk/values/TypeDescriptor.html" title="class in org.apache.beam.sdk.values">TypeDescriptor</a>&lt;OutputT&gt;&nbsp;outputType)</pre>
<div class="block">Returns a new <a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="class in org.apache.beam.sdk.transforms"><code>MapElements</code></a> transform with the given type descriptor for the output type,
but the mapping function yet to be specified using <a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html#via-org.apache.beam.sdk.transforms.SerializableFunction-"><code>via(SerializableFunction)</code></a>.</div>
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<h4>via</h4>
<pre>public&nbsp;&lt;NewInputT&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="class in org.apache.beam.sdk.transforms">MapElements</a>&lt;NewInputT,<a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="type parameter in MapElements">OutputT</a>&gt;&nbsp;via(<a href="../../../../../org/apache/beam/sdk/transforms/SerializableFunction.html" title="interface in org.apache.beam.sdk.transforms">SerializableFunction</a>&lt;NewInputT,<a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="type parameter in MapElements">OutputT</a>&gt;&nbsp;fn)</pre>
<div class="block">For a <code>SerializableFunction&lt;InputT, OutputT&gt;</code> <code>fn</code> and output type descriptor,
returns a <code>PTransform</code> that takes an input <code>PCollection&lt;InputT&gt;</code> and returns a
<code>PCollection&lt;OutputT&gt;</code> containing <code>fn.apply(v)</code> for every element <code>v</code> in the
input.
<p>Example of use in Java 8:
<pre><code>
PCollection&lt;Integer&gt; wordLengths = words.apply(
MapElements.into(TypeDescriptors.integers())
.via((String word) -&gt; word.length()));
</code></pre>
<p>In Java 7, the overload <a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html#via-org.apache.beam.sdk.transforms.SimpleFunction-"><code>via(SimpleFunction)</code></a> is more concise as the output type
descriptor need not be provided.</div>
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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#CONTEXTFUL">CONTEXTFUL</a>)
public&nbsp;&lt;NewInputT&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="class in org.apache.beam.sdk.transforms">MapElements</a>&lt;NewInputT,<a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="type parameter in MapElements">OutputT</a>&gt;&nbsp;via(<a href="../../../../../org/apache/beam/sdk/transforms/Contextful.html" title="class in org.apache.beam.sdk.transforms">Contextful</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/Contextful.Fn.html" title="interface in org.apache.beam.sdk.transforms">Contextful.Fn</a>&lt;NewInputT,<a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="type parameter in MapElements">OutputT</a>&gt;&gt;&nbsp;fn)</pre>
<div class="block">Like <a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html#via-org.apache.beam.sdk.transforms.SerializableFunction-"><code>via(SerializableFunction)</code></a>, but supports access to context, such as side inputs.</div>
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<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/MapElements.html" title="type parameter in MapElements">OutputT</a>&gt;&nbsp;expand(<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;? extends <a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="type parameter in MapElements">InputT</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
output of one of the composed transforms. Non-composite transforms, which do not apply any
transforms internally, should return a new unbound output and register evaluators (via
backend-specific registration methods).</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#expand-InputT-">expand</a></code>&nbsp;in class&nbsp;<code><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;? extends <a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="type parameter in MapElements">InputT</a>&gt;,<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/MapElements.html" title="type parameter in MapElements">OutputT</a>&gt;&gt;</code></dd>
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<h4>populateDisplayData</h4>
<pre>public&nbsp;void&nbsp;populateDisplayData(<a href="../../../../../org/apache/beam/sdk/transforms/display/DisplayData.Builder.html" title="interface in org.apache.beam.sdk.transforms.display">DisplayData.Builder</a>&nbsp;builder)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">PTransform</a></code></span></div>
<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>&nbsp;in interface&nbsp;<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="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a></code>&nbsp;in class&nbsp;<code><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;? extends <a href="../../../../../org/apache/beam/sdk/transforms/MapElements.html" title="type parameter in MapElements">InputT</a>&gt;,<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/MapElements.html" title="type parameter in MapElements">OutputT</a>&gt;&gt;</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>
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