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<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.logging.log4j.core.lookup</a></div>
<h1 title="Class PropertiesLookup" class="title">Class PropertiesLookup</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a>
<div class="inheritance">org.apache.logging.log4j.core.lookup.PropertiesLookup</div>
</div>
<section class="class-description" id="class-description">
<dl class="notes">
<dt>All Implemented Interfaces:</dt>
<dd><code><a href="StrLookup.html" title="interface in org.apache.logging.log4j.core.lookup">StrLookup</a></code></dd>
</dl>
<hr>
<div class="type-signature"><span class="modifiers">public final class </span><span class="element-name type-name-label">PropertiesLookup</span>
<span class="extends-implements">extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>
implements <a href="StrLookup.html" title="interface in org.apache.logging.log4j.core.lookup">StrLookup</a></span></div>
<div class="block">A lookup designed for <code>Properties</code> defined in the configuration. This is similar
to <a href="MapLookup.html" title="class in org.apache.logging.log4j.core.lookup"><code>MapLookup</code></a> without special handling for structured messages.
Note that this lookup is not a plugin, but wired as a default lookup in the configuration.</div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- =========== FIELD SUMMARY =========== -->
<li>
<section class="field-summary" id="field-summary">
<h2>Field Summary</h2>
<div class="inherited-list">
<h3 id="fields-inherited-from-class-org.apache.logging.log4j.core.lookup.StrLookup">Fields inherited from interface&nbsp;org.apache.logging.log4j.core.lookup.<a href="StrLookup.html" title="interface in org.apache.logging.log4j.core.lookup">StrLookup</a></h3>
<code><a href="StrLookup.html#CATEGORY">CATEGORY</a></code></div>
</section>
</li>
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<li>
<section class="constructor-summary" id="constructor-summary">
<h2>Constructor Summary</h2>
<div class="caption"><span>Constructors</span></div>
<div class="summary-table two-column-summary">
<div class="table-header col-first">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(java.util.Map)" class="member-name-link">PropertiesLookup</a><wbr>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&gt;&nbsp;properties)</code></div>
<div class="col-last even-row-color">
<div class="block">Constructs a new instance for the given map.</div>
</div>
<div class="col-constructor-name odd-row-color"><code><a href="#%3Cinit%3E(org.apache.logging.log4j.core.config.Property%5B%5D,java.util.Map)" class="member-name-link">PropertiesLookup</a><wbr>(<a href="../config/Property.html" title="class in org.apache.logging.log4j.core.config">Property</a>[]&nbsp;configProperties,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&gt;&nbsp;contextProperties)</code></div>
<div class="col-last odd-row-color">&nbsp;</div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
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<h2>Method Summary</h2>
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<div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="LookupResult.html" title="interface in org.apache.logging.log4j.core.lookup">LookupResult</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#evaluate(java.lang.String)" class="member-name-link">evaluate</a><wbr>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;key)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Same as <a href="StrLookup.html#lookup(java.lang.String)"><code>StrLookup.lookup(String)</code></a>, but provides additional metadata describing the result.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="LookupResult.html" title="interface in org.apache.logging.log4j.core.lookup">LookupResult</a></code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#evaluate(org.apache.logging.log4j.core.LogEvent,java.lang.String)" class="member-name-link">evaluate</a><wbr>(<a href="../LogEvent.html" title="interface in org.apache.logging.log4j.core">LogEvent</a>&nbsp;event,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;key)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Same as <a href="StrLookup.html#lookup(org.apache.logging.log4j.core.LogEvent,java.lang.String)"><code>StrLookup.lookup(LogEvent, String)</code></a>, but provides additional metadata describing the result.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#lookup(java.lang.String)" class="member-name-link">lookup</a><wbr>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;key)</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Looks a value from configuration properties.</div>
</div>
<div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#lookup(org.apache.logging.log4j.core.LogEvent,java.lang.String)" class="member-name-link">lookup</a><wbr>(<a href="../LogEvent.html" title="interface in org.apache.logging.log4j.core">LogEvent</a>&nbsp;event,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;key)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
<div class="block">Looks up a String key to a String value possibly using the current LogEvent.</div>
</div>
<div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div>
<div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#toString()" class="member-name-link">toString</a>()</code></div>
<div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">&nbsp;</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class&nbsp;java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#clone--" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#equals-java.lang.Object-" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#finalize--" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#getClass--" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#hashCode--" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notify--" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notifyAll--" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-" title="class or interface in java.lang" class="external-link">wait</a></code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<li>
<section class="constructor-details" id="constructor-detail">
<h2>Constructor Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="&lt;init&gt;(org.apache.logging.log4j.core.config.Property[],java.util.Map)">
<h3>PropertiesLookup</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">PropertiesLookup</span><wbr><span class="parameters">(<a href="../config/Property.html" title="class in org.apache.logging.log4j.core.config">Property</a>[]&nbsp;configProperties,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&gt;&nbsp;contextProperties)</span></div>
</section>
</li>
<li>
<section class="detail" id="&lt;init&gt;(java.util.Map)">
<h3>PropertiesLookup</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">PropertiesLookup</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html" title="class or interface in java.util" class="external-link">Map</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>,<wbr><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&gt;&nbsp;properties)</span></div>
<div class="block">Constructs a new instance for the given map.</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>properties</code> - map these.</dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method-detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="lookup(org.apache.logging.log4j.core.LogEvent,java.lang.String)">
<h3>lookup</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span>&nbsp;<span class="element-name">lookup</span><wbr><span class="parameters">(<a href="../LogEvent.html" title="interface in org.apache.logging.log4j.core">LogEvent</a>&nbsp;event,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;key)</span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="StrLookup.html#lookup(org.apache.logging.log4j.core.LogEvent,java.lang.String)">StrLookup</a></code></span></div>
<div class="block">Looks up a String key to a String value possibly using the current LogEvent.
<p>
The internal implementation may use any mechanism to return the value.
The simplest implementation is to use a Map. However, virtually any
implementation is possible.
</p>
<p>
For example, it would be possible to implement a lookup that used the
key as a primary key, and looked up the value on demand from the database
Or, a numeric based implementation could be created that treats the key
as an integer, increments the value and return the result as a string -
converting 1 to 2, 15 to 16 etc.
</p>
<p>
This method always returns a String, regardless of
the underlying data, by converting it as necessary. For example:
</p>
<pre>
Map&lt;String, Object&gt; map = new HashMap&lt;String, Object&gt;();
map.put("number", new Integer(2));
assertEquals("2", StrLookup.mapLookup(map).lookup("number"));
</pre></div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="StrLookup.html#lookup(org.apache.logging.log4j.core.LogEvent,java.lang.String)">lookup</a></code>&nbsp;in interface&nbsp;<code><a href="StrLookup.html" title="interface in org.apache.logging.log4j.core.lookup">StrLookup</a></code></dd>
<dt>Parameters:</dt>
<dd><code>event</code> - The current LogEvent.</dd>
<dd><code>key</code> - the key to be looked up, may be null</dd>
<dt>Returns:</dt>
<dd>the matching value, null if no match</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="lookup(java.lang.String)">
<h3>lookup</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span>&nbsp;<span class="element-name">lookup</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;key)</span></div>
<div class="block">Looks a value from configuration properties.
<p>
If the property is not defined, then null is returned.
</p></div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="StrLookup.html#lookup(java.lang.String)">lookup</a></code>&nbsp;in interface&nbsp;<code><a href="StrLookup.html" title="interface in org.apache.logging.log4j.core.lookup">StrLookup</a></code></dd>
<dt>Parameters:</dt>
<dd><code>key</code> - the key to be looked up, may be null</dd>
<dt>Returns:</dt>
<dd>the matching value, null if no match</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="evaluate(java.lang.String)">
<h3>evaluate</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="LookupResult.html" title="interface in org.apache.logging.log4j.core.lookup">LookupResult</a></span>&nbsp;<span class="element-name">evaluate</span><wbr><span class="parameters">(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;key)</span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="StrLookup.html#evaluate(java.lang.String)">StrLookup</a></code></span></div>
<div class="block">Same as <a href="StrLookup.html#lookup(java.lang.String)"><code>StrLookup.lookup(String)</code></a>, but provides additional metadata describing the result.
Returns null if the key cannot be evaluated, otherwise a <a href="LookupResult.html" title="interface in org.apache.logging.log4j.core.lookup"><code>LookupResult</code></a> wrapping the non-null string value.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="StrLookup.html#evaluate(java.lang.String)">evaluate</a></code>&nbsp;in interface&nbsp;<code><a href="StrLookup.html" title="interface in org.apache.logging.log4j.core.lookup">StrLookup</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="evaluate(org.apache.logging.log4j.core.LogEvent,java.lang.String)">
<h3>evaluate</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="LookupResult.html" title="interface in org.apache.logging.log4j.core.lookup">LookupResult</a></span>&nbsp;<span class="element-name">evaluate</span><wbr><span class="parameters">(<a href="../LogEvent.html" title="interface in org.apache.logging.log4j.core">LogEvent</a>&nbsp;event,
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>&nbsp;key)</span></div>
<div class="block"><span class="descfrm-type-label">Description copied from interface:&nbsp;<code><a href="StrLookup.html#evaluate(org.apache.logging.log4j.core.LogEvent,java.lang.String)">StrLookup</a></code></span></div>
<div class="block">Same as <a href="StrLookup.html#lookup(org.apache.logging.log4j.core.LogEvent,java.lang.String)"><code>StrLookup.lookup(LogEvent, String)</code></a>, but provides additional metadata describing the result.
Returns null if the key cannot be evaluated, otherwise a <a href="LookupResult.html" title="interface in org.apache.logging.log4j.core.lookup"><code>LookupResult</code></a> wrapping the non-null string value.</div>
<dl class="notes">
<dt>Specified by:</dt>
<dd><code><a href="StrLookup.html#evaluate(org.apache.logging.log4j.core.LogEvent,java.lang.String)">evaluate</a></code>&nbsp;in interface&nbsp;<code><a href="StrLookup.html" title="interface in org.apache.logging.log4j.core.lookup">StrLookup</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="toString()">
<h3>toString</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span>&nbsp;<span class="element-name">toString</span>()</div>
<dl class="notes">
<dt>Overrides:</dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#toString--" title="class or interface in java.lang" class="external-link">toString</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></code></dd>
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