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<h2 title="Class JsonTuples" class="title">Class JsonTuples</h2>
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<li>java.lang.Object</li>
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<pre>public class <span class="typeNameLabel">JsonTuples</span>
extends java.lang.Object</pre>
<div class="block">Utilties to ease working working with sensor "samples" by wrapping them
in JsonObjects.
<p>
The Json Tuple sensor "samples" have a standard collection of properties.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/samples/apps/JsonTuples.html#KEY_AGG_BEGIN_TS">KEY_AGG_BEGIN_TS</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/samples/apps/JsonTuples.html#KEY_AGG_COUNT">KEY_AGG_COUNT</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/samples/apps/JsonTuples.html#KEY_ID">KEY_ID</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/samples/apps/JsonTuples.html#KEY_READING">KEY_READING</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/samples/apps/JsonTuples.html#KEY_TS">KEY_TS</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/samples/apps/JsonTuples.html#JsonTuples--">JsonTuples</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>static com.google.gson.JsonElement</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/samples/apps/JsonTuples.html#getStatistic-com.google.gson.JsonObject-org.apache.edgent.analytics.math3.stat.Statistic-">getStatistic</a></span>(com.google.gson.JsonObject&nbsp;jo,
<a href="../../../../../org/apache/edgent/analytics/math3/stat/Statistic.html" title="enum in org.apache.edgent.analytics.math3.stat">Statistic</a>&nbsp;stat)</code>
<div class="block">Get a statistic value from a sample.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static com.google.gson.JsonElement</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/samples/apps/JsonTuples.html#getStatistic-com.google.gson.JsonObject-java.lang.String-org.apache.edgent.analytics.math3.stat.Statistic-">getStatistic</a></span>(com.google.gson.JsonObject&nbsp;jo,
java.lang.String&nbsp;valueKey,
<a href="../../../../../org/apache/edgent/analytics/math3/stat/Statistic.html" title="enum in org.apache.edgent.analytics.math3.stat">Statistic</a>&nbsp;stat)</code>
<div class="block">Get a statistic value from a sample.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a>&lt;com.google.gson.JsonObject,java.lang.String&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/samples/apps/JsonTuples.html#keyFn--">keyFn</a></span>()</code>
<div class="block">The partition key function for wrapped sensor samples.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../../org/apache/edgent/function/BiFunction.html" title="interface in org.apache.edgent.function">BiFunction</a>&lt;java.util.List&lt;com.google.gson.JsonObject&gt;,java.lang.String,com.google.gson.JsonObject&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/samples/apps/JsonTuples.html#statistics-org.apache.edgent.analytics.math3.stat.Statistic...-">statistics</a></span>(<a href="../../../../../org/apache/edgent/analytics/math3/stat/Statistic.html" title="enum in org.apache.edgent.analytics.math3.stat">Statistic</a>...&nbsp;statistics)</code>
<div class="block">Create a function that computes the specified statistics on the list of
samples and returns a new sample containing the result.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>static &lt;T&gt;&nbsp;com.google.gson.JsonObject</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/samples/apps/JsonTuples.html#wrap-org.apache.commons.math3.util.Pair-java.lang.String-">wrap</a></span>(org.apache.commons.math3.util.Pair&lt;java.lang.Long,T&gt;&nbsp;sample,
java.lang.String&nbsp;id)</code>
<div class="block">Create a JsonObject wrapping a raw <code>Pair&lt;Long msec,T reading&gt;&gt;</code> sample.</div>
</td>
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<tr id="i5" class="rowColor">
<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a>&lt;com.google.gson.JsonObject&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/edgent/samples/apps/JsonTuples.html#wrap-org.apache.edgent.topology.TStream-java.lang.String-">wrap</a></span>(<a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a>&lt;org.apache.commons.math3.util.Pair&lt;java.lang.Long,T&gt;&gt;&nbsp;stream,
java.lang.String&nbsp;id)</code>
<div class="block">Create a stream of JsonObject wrapping a stream of
raw <code>Pair&lt;Long msec,T reading&gt;&gt;</code> samples.</div>
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<pre>public static final&nbsp;java.lang.String KEY_ID</pre>
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<dd><a href="../../../../../constant-values.html#org.apache.edgent.samples.apps.JsonTuples.KEY_ID">Constant Field Values</a></dd>
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<pre>public static final&nbsp;java.lang.String KEY_TS</pre>
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<dd><a href="../../../../../constant-values.html#org.apache.edgent.samples.apps.JsonTuples.KEY_TS">Constant Field Values</a></dd>
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<pre>public static final&nbsp;java.lang.String KEY_READING</pre>
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<dd><a href="../../../../../constant-values.html#org.apache.edgent.samples.apps.JsonTuples.KEY_READING">Constant Field Values</a></dd>
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<pre>public static final&nbsp;java.lang.String KEY_AGG_BEGIN_TS</pre>
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<dd><a href="../../../../../constant-values.html#org.apache.edgent.samples.apps.JsonTuples.KEY_AGG_BEGIN_TS">Constant Field Values</a></dd>
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<pre>public static final&nbsp;java.lang.String KEY_AGG_COUNT</pre>
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<dd><a href="../../../../../constant-values.html#org.apache.edgent.samples.apps.JsonTuples.KEY_AGG_COUNT">Constant Field Values</a></dd>
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<pre>public&nbsp;JsonTuples()</pre>
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<pre>public static&nbsp;&lt;T&gt;&nbsp;com.google.gson.JsonObject&nbsp;wrap(org.apache.commons.math3.util.Pair&lt;java.lang.Long,T&gt;&nbsp;sample,
java.lang.String&nbsp;id)</pre>
<div class="block">Create a JsonObject wrapping a raw <code>Pair&lt;Long msec,T reading&gt;&gt;</code> sample.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - Tuple type</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>sample</code> - the raw sample</dd>
<dd><code>id</code> - the sensor's Id</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the wrapped sample</dd>
</dl>
</li>
</ul>
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<h4>wrap</h4>
<pre>public static&nbsp;&lt;T&gt;&nbsp;<a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a>&lt;com.google.gson.JsonObject&gt;&nbsp;wrap(<a href="../../../../../org/apache/edgent/topology/TStream.html" title="interface in org.apache.edgent.topology">TStream</a>&lt;org.apache.commons.math3.util.Pair&lt;java.lang.Long,T&gt;&gt;&nbsp;stream,
java.lang.String&nbsp;id)</pre>
<div class="block">Create a stream of JsonObject wrapping a stream of
raw <code>Pair&lt;Long msec,T reading&gt;&gt;</code> samples.</div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - Tuple type</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>stream</code> - the raw input stream</dd>
<dd><code>id</code> - the sensor's Id</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the wrapped stream</dd>
</dl>
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<pre>public static&nbsp;<a href="../../../../../org/apache/edgent/function/Function.html" title="interface in org.apache.edgent.function">Function</a>&lt;com.google.gson.JsonObject,java.lang.String&gt;&nbsp;keyFn()</pre>
<div class="block">The partition key function for wrapped sensor samples.
<p>
The <code>KEY_ID</code> property is returned for the key.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the function</dd>
</dl>
</li>
</ul>
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<pre>public static&nbsp;com.google.gson.JsonElement&nbsp;getStatistic(com.google.gson.JsonObject&nbsp;jo,
<a href="../../../../../org/apache/edgent/analytics/math3/stat/Statistic.html" title="enum in org.apache.edgent.analytics.math3.stat">Statistic</a>&nbsp;stat)</pre>
<div class="block">Get a statistic value from a sample.
<p>
Same as <code>getStatistic(jo, JsonTuples.KEY_READING, stat)</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>jo</code> - the sample</dd>
<dd><code>stat</code> - the Statistic of interest</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the JsonElement for the Statistic</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.RuntimeException</code> - of the stat isn't present</dd>
</dl>
</li>
</ul>
<a name="getStatistic-com.google.gson.JsonObject-java.lang.String-org.apache.edgent.analytics.math3.stat.Statistic-">
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<h4>getStatistic</h4>
<pre>public static&nbsp;com.google.gson.JsonElement&nbsp;getStatistic(com.google.gson.JsonObject&nbsp;jo,
java.lang.String&nbsp;valueKey,
<a href="../../../../../org/apache/edgent/analytics/math3/stat/Statistic.html" title="enum in org.apache.edgent.analytics.math3.stat">Statistic</a>&nbsp;stat)</pre>
<div class="block">Get a statistic value from a sample.
<p>
Convenience for working with samples containing a property
whose value is one or more <a href="../../../../../org/apache/edgent/analytics/math3/stat/Statistic.html" title="enum in org.apache.edgent.analytics.math3.stat"><code>Statistic</code></a>
as created by
<a href="../../../../../org/apache/edgent/analytics/math3/json/JsonAnalytics.html#aggregate-org.apache.edgent.topology.TWindow-java.lang.String-java.lang.String-org.apache.edgent.analytics.math3.json.JsonUnivariateAggregate...-"><code>JsonAnalytics.aggregate()</code></a></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>jo</code> - the sample</dd>
<dd><code>valueKey</code> - the name of the property containing the JsonObject of Statistics</dd>
<dd><code>stat</code> - the Statistic of interest</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the JsonElement for the Statistic</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.RuntimeException</code> - of the stat isn't present</dd>
</dl>
</li>
</ul>
<a name="statistics-org.apache.edgent.analytics.math3.stat.Statistic...-">
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<h4>statistics</h4>
<pre>public static&nbsp;<a href="../../../../../org/apache/edgent/function/BiFunction.html" title="interface in org.apache.edgent.function">BiFunction</a>&lt;java.util.List&lt;com.google.gson.JsonObject&gt;,java.lang.String,com.google.gson.JsonObject&gt;&nbsp;statistics(<a href="../../../../../org/apache/edgent/analytics/math3/stat/Statistic.html" title="enum in org.apache.edgent.analytics.math3.stat">Statistic</a>...&nbsp;statistics)</pre>
<div class="block">Create a function that computes the specified statistics on the list of
samples and returns a new sample containing the result.
<p>
The single tuple contains the specified statistics computed over
all of the <code>JsonTuple.KEY_READING</code>
values from <code>List&lt;JsonObject&gt;</code>.
<p>
The resulting sample contains the properties:
<ul>
<li>JsonTuple.KEY_ID</li>
<li>JsonTuple.KEY_MSEC - msecTimestamp of the last sample in the window</li>
<li>JsonTuple.KEY_AGG_BEGIN_MSEC - msecTimestamp of the first sample in the window</li>
<li>JsonTuple.KEY_AGG_COUNT - number of samples in the window (<code>value=factor</code>)</li>
<li>JsonTuple.KEY_READING - a JsonObject of the statistics
as defined by
<a href="../../../../../org/apache/edgent/analytics/math3/json/JsonAnalytics.html#aggregate-org.apache.edgent.topology.TWindow-java.lang.String-java.lang.String-org.apache.edgent.analytics.math3.json.JsonUnivariateAggregate...-"><code>JsonAnalytics.aggregate()</code></a>
</ul>
<p>
Sample use:
<pre><code>
TStream&lt;JsonObject&gt; s = ...
// reduce s by a factor of 100 with stats MEAN and STDEV
TStream&lt;JsonObject&gt; reduced = s.batch(100, statistics(Statistic.MEAN, Statistic.STDDEV));
</code></pre></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>statistics</code> - the statistics to calculate over the window</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>TStream&lt;JsonObject&gt;</code> for the reduced <code>stream</code></dd>
</dl>
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