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<div class="subTitle">org.apache.logging.log4j.util</div>
<h2 title="Class Strings" class="title">Class Strings</h2>
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<pre>public final class <a href="../../../../../src-html/org/apache/logging/log4j/util/Strings.html#line.26">Strings</a>
extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block"><em>Consider this class private.</em></div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="http://commons.apache.org/proper/commons-lang/">Apache Commons Lang</a></dd></dl>
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<tr class="altColor">
<td class="colFirst"><code>static <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/logging/log4j/util/Strings.html#EMPTY">EMPTY</a></strong></code>
<div class="block">The empty string.</div>
</td>
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<td class="colFirst"><code>static <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/logging/log4j/util/Strings.html#dquote(java.lang.String)">dquote</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;str)</code>
<div class="block">Returns a double quoted string.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/logging/log4j/util/Strings.html#isBlank(java.lang.String)">isBlank</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;s)</code>
<div class="block">Checks if a String is blank.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/logging/log4j/util/Strings.html#isEmpty(java.lang.CharSequence)">isEmpty</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang">CharSequence</a>&nbsp;cs)</code>
<div class="block">
Checks if a CharSequence is empty ("") or null.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/logging/log4j/util/Strings.html#isNotBlank(java.lang.String)">isNotBlank</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;s)</code>
<div class="block">Checks if a String is not blank.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/logging/log4j/util/Strings.html#isNotEmpty(java.lang.CharSequence)">isNotEmpty</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang">CharSequence</a>&nbsp;cs)</code>
<div class="block">
Checks if a CharSequence is not empty ("") and not null.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/logging/log4j/util/Strings.html#quote(java.lang.String)">quote</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;str)</code>
<div class="block">Returns a quoted string.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/logging/log4j/util/Strings.html#toRootUpperCase(java.lang.String)">toRootUpperCase</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;str)</code>
<div class="block">Shorthand for <code>str.toUpperCase(Locale.ROOT);</code></div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/logging/log4j/util/Strings.html#trimToNull(java.lang.String)">trimToNull</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;str)</code>
<div class="block">
Removes control characters (char &lt;= 32) from both ends of this String returning <code>null</code> if the String is
empty ("") after the trim or if it is <code>null</code>.</div>
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<pre>public static final&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> <a href="../../../../../src-html/org/apache/logging/log4j/util/Strings.html#line.31">EMPTY</a></pre>
<div class="block">The empty string.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../../constant-values.html#org.apache.logging.log4j.util.Strings.EMPTY">Constant Field Values</a></dd></dl>
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<pre>public static&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;<a href="../../../../../src-html/org/apache/logging/log4j/util/Strings.html#line.43">dquote</a>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;str)</pre>
<div class="block">Returns a double quoted string.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>str</code> - a String</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>"str"</code></dd></dl>
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<h4>isBlank</h4>
<pre>public static&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/logging/log4j/util/Strings.html#line.54">isBlank</a>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;s)</pre>
<div class="block">Checks if a String is blank. A blank string is one that is <code>null</code>, empty, or when trimmed using
<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true#trim()" title="class or interface in java.lang"><code>String.trim()</code></a> is empty.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>s</code> - the String to check, may be <code>null</code></dd>
<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the String is <code>null</code>, empty, or trims to empty.</dd></dl>
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<h4>isEmpty</h4>
<pre>public static&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/logging/log4j/util/Strings.html#line.83">isEmpty</a>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang">CharSequence</a>&nbsp;cs)</pre>
<div class="block"><p>
Checks if a CharSequence is empty ("") or null.
</p>
<pre>
Strings.isEmpty(null) = true
Strings.isEmpty("") = true
Strings.isEmpty(" ") = false
Strings.isEmpty("bob") = false
Strings.isEmpty(" bob ") = false
</pre>
<p>
NOTE: This method changed in Lang version 2.0. It no longer trims the CharSequence. That functionality is
available in isBlank().
</p>
<p>
Copied from Apache Commons Lang org.apache.commons.lang3.StringUtils.isEmpty(CharSequence)
</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>cs</code> - the CharSequence to check, may be null</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the CharSequence is empty or null</dd></dl>
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<h4>isNotBlank</h4>
<pre>public static&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/logging/log4j/util/Strings.html#line.93">isNotBlank</a>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;s)</pre>
<div class="block">Checks if a String is not blank. The opposite of <a href="../../../../../org/apache/logging/log4j/util/Strings.html#isBlank(java.lang.String)"><code>isBlank(String)</code></a>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>s</code> - the String to check, may be <code>null</code></dd>
<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the String is non-<code>null</code> and has content after being trimmed.</dd></dl>
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<h4>isNotEmpty</h4>
<pre>public static&nbsp;boolean&nbsp;<a href="../../../../../src-html/org/apache/logging/log4j/util/Strings.html#line.117">isNotEmpty</a>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang">CharSequence</a>&nbsp;cs)</pre>
<div class="block"><p>
Checks if a CharSequence is not empty ("") and not null.
</p>
<pre>
Strings.isNotEmpty(null) = false
Strings.isNotEmpty("") = false
Strings.isNotEmpty(" ") = true
Strings.isNotEmpty("bob") = true
Strings.isNotEmpty(" bob ") = true
</pre>
<p>
Copied from Apache Commons Lang org.apache.commons.lang3.StringUtils.isNotEmpty(CharSequence)
</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>cs</code> - the CharSequence to check, may be null</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the CharSequence is not empty and not null</dd></dl>
</li>
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<h4>quote</h4>
<pre>public static&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;<a href="../../../../../src-html/org/apache/logging/log4j/util/Strings.html#line.127">quote</a>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;str)</pre>
<div class="block">Returns a quoted string.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>str</code> - a String</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>'str'</code></dd></dl>
</li>
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<h4>toRootUpperCase</h4>
<pre>public&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;<a href="../../../../../src-html/org/apache/logging/log4j/util/Strings.html#line.137">toRootUpperCase</a>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;str)</pre>
<div class="block">Shorthand for <code>str.toUpperCase(Locale.ROOT);</code></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>str</code> - The string to upper case.</dd>
<dt><span class="strong">Returns:</span></dt><dd>a new string</dd><dt><span class="strong">See Also:</span></dt><dd><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true#toLowerCase(java.util.Locale)" title="class or interface in java.lang"><code>String.toLowerCase(Locale)</code></a></dd></dl>
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<h4>trimToNull</h4>
<pre>public static&nbsp;<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;<a href="../../../../../src-html/org/apache/logging/log4j/util/Strings.html#line.165">trimToNull</a>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;str)</pre>
<div class="block"><p>
Removes control characters (char &lt;= 32) from both ends of this String returning <code>null</code> if the String is
empty ("") after the trim or if it is <code>null</code>.
<p>
The String is trimmed using <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true#trim()" title="class or interface in java.lang"><code>String.trim()</code></a>. Trim removes start and end characters &lt;= 32.
</p>
<pre>
Strings.trimToNull(null) = null
Strings.trimToNull("") = null
Strings.trimToNull(" ") = null
Strings.trimToNull("abc") = "abc"
Strings.trimToNull(" abc ") = "abc"
</pre>
<p>
Copied from Apache Commons Lang org.apache.commons.lang3.StringUtils.trimToNull(String)
</p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>str</code> - the String to be trimmed, may be null</dd>
<dt><span class="strong">Returns:</span></dt><dd>the trimmed String, <code>null</code> if only chars &lt;= 32, empty or null String input</dd></dl>
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