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+<!-- ======== START OF CLASS DATA ======== -->
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href="../../../../../org/apache/samza/operators/data/Offset.html" 
title="interface in org.apache.samza.operators.data">Offset</a>&gt;</dd>
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title="class in org.apache.samza.operators.data">LongOffset</a></dd>
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href="../../../../../org/apache/samza/annotation/InterfaceStability.Unstable.html"
 title="annotation in 
org.apache.samza.annotation">@InterfaceStability.Unstable</a>
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href="../../../../../org/apache/samza/operators/data/Offset.html" 
title="interface in org.apache.samza.operators.data">Offset</a>&gt;</pre>
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href="../../../../../org/apache/samza/operators/data/Offset.html" 
title="interface in org.apache.samza.operators.data">Offset</a></td>
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title="class in org.apache.samza.operators.data">InputMessageEnvelope</a></td>
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additional information about its input <a 
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href="../../../../../org/apache/samza/operators/data/LongOffset.html" 
title="class in org.apache.samza.operators.data">LongOffset</a></td>
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href="../../../../../org/apache/samza/operators/data/Offset.html" 
title="interface in org.apache.samza.operators.data"><code>Offset</code></a>, 
w/ <code>long</code> value as the offset</div>
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+<div class="header">
+<div class="subTitle">org.apache.samza.operators.functions</div>
+<h2 title="Interface FilterFunction" class="title">Interface 
FilterFunction&lt;M&gt;</h2>
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+<dt><span class="paramLabel">Type Parameters:</span></dt>
+<dd><code>M</code> - type of the input message</dd>
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+<dt>All Superinterfaces:</dt>
+<dd><a 
href="../../../../../org/apache/samza/operators/functions/InitableFunction.html"
 title="interface in 
org.apache.samza.operators.functions">InitableFunction</a></dd>
+</dl>
+<dl>
+<dt>Functional Interface:</dt>
+<dd>This is a functional interface and can therefore be used as the assignment 
target for a lambda expression or method reference.</dd>
+</dl>
+<hr>
+<br>
+<pre><a 
href="../../../../../org/apache/samza/annotation/InterfaceStability.Unstable.html"
 title="annotation in 
org.apache.samza.annotation">@InterfaceStability.Unstable</a>
+ @FunctionalInterface
+public interface <span class="typeNameLabel">FilterFunction&lt;M&gt;</span>
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href="../../../../../org/apache/samza/operators/functions/InitableFunction.html"
 title="interface in 
org.apache.samza.operators.functions">InitableFunction</a></pre>
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retained for further processing or filtered out.</div>
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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="t2" class="tableTab"><span><a 
href="javascript:show(2);">Instance Methods</a></span><span 
class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a 
href="javascript:show(4);">Abstract 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>
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+<tr id="i0" class="altColor">
+<td class="colFirst"><code>boolean</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/samza/operators/functions/FilterFunction.html#apply-M-">apply</a></span>(<a
 href="../../../../../org/apache/samza/operators/functions/FilterFunction.html" 
title="type parameter in FilterFunction">M</a>&nbsp;message)</code>
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retained or filtered out.</div>
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href="../../../../../org/apache/samza/operators/functions/InitableFunction.html"
 title="interface in 
org.apache.samza.operators.functions">InitableFunction</a></h3>
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title="type parameter in FilterFunction">M</a>&nbsp;message)</pre>
+<div class="block">Returns a boolean indicating whether this message should be 
retained or filtered out.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>message</code> - the input message to be checked</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>true if <code>message</code> should be retained</dd>
+</dl>
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+<div class="header">
+<div class="subTitle">org.apache.samza.operators.functions</div>
+<h2 title="Interface FlatMapFunction" class="title">Interface 
FlatMapFunction&lt;M,OM&gt;</h2>
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+<dt><span class="paramLabel">Type Parameters:</span></dt>
+<dd><code>M</code> - type of the input message</dd>
+<dd><code>OM</code> - type of the transformed messages</dd>
+</dl>
+<dl>
+<dt>All Superinterfaces:</dt>
+<dd><a 
href="../../../../../org/apache/samza/operators/functions/InitableFunction.html"
 title="interface in 
org.apache.samza.operators.functions">InitableFunction</a></dd>
+</dl>
+<dl>
+<dt>Functional Interface:</dt>
+<dd>This is a functional interface and can therefore be used as the assignment 
target for a lambda expression or method reference.</dd>
+</dl>
+<hr>
+<br>
+<pre><a 
href="../../../../../org/apache/samza/annotation/InterfaceStability.Unstable.html"
 title="annotation in 
org.apache.samza.annotation">@InterfaceStability.Unstable</a>
+ @FunctionalInterface
+public interface <span class="typeNameLabel">FlatMapFunction&lt;M,OM&gt;</span>
+extends <a 
href="../../../../../org/apache/samza/operators/functions/InitableFunction.html"
 title="interface in 
org.apache.samza.operators.functions">InitableFunction</a></pre>
+<div class="block">A function that transforms an input message into a 
collection of 0 or more messages,
+ possibly of a different type.</div>
+</li>
+</ul>
+</div>
+<div class="summary">
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+</a>
+<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="t2" class="tableTab"><span><a 
href="javascript:show(2);">Instance Methods</a></span><span 
class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a 
href="javascript:show(4);">Abstract 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>java.util.Collection&lt;<a 
href="../../../../../org/apache/samza/operators/functions/FlatMapFunction.html" 
title="type parameter in FlatMapFunction">OM</a>&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/samza/operators/functions/FlatMapFunction.html#apply-M-">apply</a></span>(<a
 
href="../../../../../org/apache/samza/operators/functions/FlatMapFunction.html" 
title="type parameter in FlatMapFunction">M</a>&nbsp;message)</code>
+<div class="block">Transforms the provided message into a collection of 0 or 
more messages.</div>
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+<li class="blockList"><a 
name="methods.inherited.from.class.org.apache.samza.operators.functions.InitableFunction">
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+<h3>Methods inherited from 
interface&nbsp;org.apache.samza.operators.functions.<a 
href="../../../../../org/apache/samza/operators/functions/InitableFunction.html"
 title="interface in 
org.apache.samza.operators.functions">InitableFunction</a></h3>
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href="../../../../../org/apache/samza/operators/functions/InitableFunction.html#init-org.apache.samza.config.Config-org.apache.samza.task.TaskContext-">init</a></code></li>
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+<li class="blockList"><a name="method.detail">
+<!--   -->
+</a>
+<h3>Method Detail</h3>
+<a name="apply-java.lang.Object-">
+<!--   -->
+</a><a name="apply-M-">
+<!--   -->
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+<h4>apply</h4>
+<pre>java.util.Collection&lt;<a 
href="../../../../../org/apache/samza/operators/functions/FlatMapFunction.html" 
title="type parameter in FlatMapFunction">OM</a>&gt;&nbsp;apply(<a 
href="../../../../../org/apache/samza/operators/functions/FlatMapFunction.html" 
title="type parameter in FlatMapFunction">M</a>&nbsp;message)</pre>
+<div class="block">Transforms the provided message into a collection of 0 or 
more messages.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>message</code> - the input message to be transformed</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>a collection of 0 or more transformed messages</dd>
+</dl>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<!-- ========= END OF CLASS DATA ========= -->
+<!-- ======= START OF BOTTOM NAVBAR ====== -->
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+<ul class="subNavList">
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+<ul class="subNavList">
+<li>Detail:&nbsp;</li>
+<li>Field&nbsp;|&nbsp;</li>
+<li>Constr&nbsp;|&nbsp;</li>
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+<!-- ========= END OF TOP NAVBAR ========= -->
+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.samza.operators.functions</div>
+<h2 title="Interface InitableFunction" class="title">Interface 
InitableFunction</h2>
+</div>
+<div class="contentContainer">
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt>All Known Subinterfaces:</dt>
+<dd><a 
href="../../../../../org/apache/samza/operators/functions/FilterFunction.html" 
title="interface in 
org.apache.samza.operators.functions">FilterFunction</a>&lt;M&gt;, <a 
href="../../../../../org/apache/samza/operators/functions/FlatMapFunction.html" 
title="interface in 
org.apache.samza.operators.functions">FlatMapFunction</a>&lt;M,OM&gt;, <a 
href="../../../../../org/apache/samza/operators/functions/JoinFunction.html" 
title="interface in 
org.apache.samza.operators.functions">JoinFunction</a>&lt;K,M,JM,RM&gt;, <a 
href="../../../../../org/apache/samza/operators/functions/MapFunction.html" 
title="interface in 
org.apache.samza.operators.functions">MapFunction</a>&lt;M,OM&gt;, <a 
href="../../../../../org/apache/samza/operators/functions/SinkFunction.html" 
title="interface in 
org.apache.samza.operators.functions">SinkFunction</a>&lt;M&gt;</dd>
+</dl>
+<hr>
+<br>
+<pre><a 
href="../../../../../org/apache/samza/annotation/InterfaceStability.Unstable.html"
 title="annotation in 
org.apache.samza.annotation">@InterfaceStability.Unstable</a>
+public interface <span class="typeNameLabel">InitableFunction</span></pre>
+<div class="block">interface defined to initalize the context of message 
transformation functions</div>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
+<!-- ========== METHOD SUMMARY =========== -->
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+<li class="blockList"><a name="method.summary">
+<!--   -->
+</a>
+<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="t2" class="tableTab"><span><a 
href="javascript:show(2);">Instance Methods</a></span><span 
class="tabEnd">&nbsp;</span></span><span id="t5" class="tableTab"><span><a 
href="javascript:show(16);">Default 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>default void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/samza/operators/functions/InitableFunction.html#init-org.apache.samza.config.Config-org.apache.samza.task.TaskContext-">init</a></span>(<a
 href="../../../../../org/apache/samza/config/Config.html" title="class in 
org.apache.samza.config">Config</a>&nbsp;config,
+    <a href="../../../../../org/apache/samza/task/TaskContext.html" 
title="interface in org.apache.samza.task">TaskContext</a>&nbsp;context)</code>
+<div class="block">Interface method to initialize the context for a specific 
message transformation function.</div>
+</td>
+</tr>
+</table>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="details">
+<ul class="blockList">
+<li class="blockList">
+<!-- ============ METHOD DETAIL ========== -->
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+<ul class="blockListLast">
+<li class="blockList">
+<h4>init</h4>
+<pre>default&nbsp;void&nbsp;init(<a 
href="../../../../../org/apache/samza/config/Config.html" title="class in 
org.apache.samza.config">Config</a>&nbsp;config,
+                  <a 
href="../../../../../org/apache/samza/task/TaskContext.html" title="interface 
in org.apache.samza.task">TaskContext</a>&nbsp;context)</pre>
+<div class="block">Interface method to initialize the context for a specific 
message transformation function.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>config</code> - the <a 
href="../../../../../org/apache/samza/config/Config.html" title="class in 
org.apache.samza.config"><code>Config</code></a> object for this task</dd>
+<dd><code>context</code> - the <a 
href="../../../../../org/apache/samza/task/TaskContext.html" title="interface 
in org.apache.samza.task"><code>TaskContext</code></a> object for this task</dd>
+</dl>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<!-- ========= END OF CLASS DATA ========= -->
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+<title>JoinFunction (samza-api 0.13.0-SNAPSHOT API)</title>
+<meta name="date" content="2017-02-22">
+<link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" 
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+<ul class="subNavList">
+<li>Summary:&nbsp;</li>
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+<ul class="subNavList">
+<li>Detail:&nbsp;</li>
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+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.samza.operators.functions</div>
+<h2 title="Interface JoinFunction" class="title">Interface 
JoinFunction&lt;K,M,JM,RM&gt;</h2>
+</div>
+<div class="contentContainer">
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<dl>
+<dt><span class="paramLabel">Type Parameters:</span></dt>
+<dd><code>K</code> - type of the join key</dd>
+<dd><code>M</code> - type of the input message</dd>
+<dd><code>JM</code> - type of the message to join with</dd>
+<dd><code>RM</code> - type of the joined message</dd>
+</dl>
+<dl>
+<dt>All Superinterfaces:</dt>
+<dd><a 
href="../../../../../org/apache/samza/operators/functions/InitableFunction.html"
 title="interface in 
org.apache.samza.operators.functions">InitableFunction</a></dd>
+</dl>
+<hr>
+<br>
+<pre><a 
href="../../../../../org/apache/samza/annotation/InterfaceStability.Unstable.html"
 title="annotation in 
org.apache.samza.annotation">@InterfaceStability.Unstable</a>
+public interface <span 
class="typeNameLabel">JoinFunction&lt;K,M,JM,RM&gt;</span>
+extends <a 
href="../../../../../org/apache/samza/operators/functions/InitableFunction.html"
 title="interface in 
org.apache.samza.operators.functions">InitableFunction</a></pre>
+<div class="block">A function that joins messages from two <a 
href="../../../../../org/apache/samza/operators/MessageStream.html" 
title="interface in org.apache.samza.operators"><code>MessageStream</code></a>s 
and produces
+ a joined message.</div>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
+<!-- ========== METHOD SUMMARY =========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method.summary">
+<!--   -->
+</a>
+<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="t2" class="tableTab"><span><a 
href="javascript:show(2);">Instance Methods</a></span><span 
class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a 
href="javascript:show(4);">Abstract 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/samza/operators/functions/JoinFunction.html" 
title="type parameter in JoinFunction">RM</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/samza/operators/functions/JoinFunction.html#apply-M-JM-">apply</a></span>(<a
 href="../../../../../org/apache/samza/operators/functions/JoinFunction.html" 
title="type parameter in JoinFunction">M</a>&nbsp;message,
+     <a 
href="../../../../../org/apache/samza/operators/functions/JoinFunction.html" 
title="type parameter in JoinFunction">JM</a>&nbsp;otherMessage)</code>
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messages.</div>
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href="../../../../../org/apache/samza/operators/functions/JoinFunction.html" 
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title="type parameter in JoinFunction">M</a>&nbsp;message)</code>
+<div class="block">Method to get the join key in the messages from the first 
input stream</div>
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+<tr id="i2" class="altColor">
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href="../../../../../org/apache/samza/operators/functions/JoinFunction.html" 
title="type parameter in JoinFunction">K</a></code></td>
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href="../../../../../org/apache/samza/operators/functions/JoinFunction.html#getSecondKey-JM-">getSecondKey</a></span>(<a
 href="../../../../../org/apache/samza/operators/functions/JoinFunction.html" 
title="type parameter in JoinFunction">JM</a>&nbsp;message)</code>
+<div class="block">Method to get the join key in the messages from the second 
input stream</div>
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interface&nbsp;org.apache.samza.operators.functions.<a 
href="../../../../../org/apache/samza/operators/functions/InitableFunction.html"
 title="interface in 
org.apache.samza.operators.functions">InitableFunction</a></h3>
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href="../../../../../org/apache/samza/operators/functions/JoinFunction.html" 
title="type parameter in JoinFunction">RM</a>&nbsp;apply(<a 
href="../../../../../org/apache/samza/operators/functions/JoinFunction.html" 
title="type parameter in JoinFunction">M</a>&nbsp;message,
+         <a 
href="../../../../../org/apache/samza/operators/functions/JoinFunction.html" 
title="type parameter in JoinFunction">JM</a>&nbsp;otherMessage)</pre>
+<div class="block">Join the provided input messages and produces the joined 
messages.</div>
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href="../../../../../org/apache/samza/operators/functions/JoinFunction.html" 
title="type parameter in JoinFunction">M</a>&nbsp;message)</pre>
+<div class="block">Method to get the join key in the messages from the first 
input stream</div>
+<dl>
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+<dd><code>message</code> - the input message from the first input stream</dd>
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href="../../../../../org/apache/samza/operators/functions/JoinFunction.html" 
title="type parameter in JoinFunction">JM</a>&nbsp;message)</pre>
+<div class="block">Method to get the join key in the messages from the second 
input stream</div>
+<dl>
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+<dd><code>message</code> - the input message from the second input stream</dd>
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+<ul class="subNavList">
+<li>Detail:&nbsp;</li>
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+<!-- ======== START OF CLASS DATA ======== -->
+<div class="header">
+<div class="subTitle">org.apache.samza.operators.functions</div>
+<h2 title="Interface MapFunction" class="title">Interface 
MapFunction&lt;M,OM&gt;</h2>
+</div>
+<div class="contentContainer">
+<div class="description">
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+<li class="blockList">
+<dl>
+<dt><span class="paramLabel">Type Parameters:</span></dt>
+<dd><code>M</code> - type of the input message</dd>
+<dd><code>OM</code> - type of the transformed message</dd>
+</dl>
+<dl>
+<dt>All Superinterfaces:</dt>
+<dd><a 
href="../../../../../org/apache/samza/operators/functions/InitableFunction.html"
 title="interface in 
org.apache.samza.operators.functions">InitableFunction</a></dd>
+</dl>
+<dl>
+<dt>Functional Interface:</dt>
+<dd>This is a functional interface and can therefore be used as the assignment 
target for a lambda expression or method reference.</dd>
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+<pre><a 
href="../../../../../org/apache/samza/annotation/InterfaceStability.Unstable.html"
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+public interface <span class="typeNameLabel">MapFunction&lt;M,OM&gt;</span>
+extends <a 
href="../../../../../org/apache/samza/operators/functions/InitableFunction.html"
 title="interface in 
org.apache.samza.operators.functions">InitableFunction</a></pre>
+<div class="block">A function that transforms an input message into another 
message, possibly of a different type.</div>
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+<td class="colFirst"><code><a 
href="../../../../../org/apache/samza/operators/functions/MapFunction.html" 
title="type parameter in MapFunction">OM</a></code></td>
+<td class="colLast"><code><span class="memberNameLink"><a 
href="../../../../../org/apache/samza/operators/functions/MapFunction.html#apply-M-">apply</a></span>(<a
 href="../../../../../org/apache/samza/operators/functions/MapFunction.html" 
title="type parameter in MapFunction">M</a>&nbsp;message)</code>
+<div class="block">Transforms the provided message into another message</div>
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name="methods.inherited.from.class.org.apache.samza.operators.functions.InitableFunction">
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+<h3>Methods inherited from 
interface&nbsp;org.apache.samza.operators.functions.<a 
href="../../../../../org/apache/samza/operators/functions/InitableFunction.html"
 title="interface in 
org.apache.samza.operators.functions">InitableFunction</a></h3>
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+<pre><a 
href="../../../../../org/apache/samza/operators/functions/MapFunction.html" 
title="type parameter in MapFunction">OM</a>&nbsp;apply(<a 
href="../../../../../org/apache/samza/operators/functions/MapFunction.html" 
title="type parameter in MapFunction">M</a>&nbsp;message)</pre>
+<div class="block">Transforms the provided message into another message</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>message</code> - the input message to be transformed</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>the transformed message</dd>
+</dl>
+</li>
+</ul>
+</li>
+</ul>
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