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property_types.html
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<!DOCTYPE html>
<!--
| Generated by Apache Maven Doxia Site Renderer 1.11.1 from src/xdocs/property_types.xml at 2024-12-28
| Rendered using Apache Maven Default Skin
-->
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="generator" content="Apache Maven Doxia Site Renderer 1.11.1" />
<title>checkstyle – Property Types</title>
<link rel="stylesheet" href="./css/maven-base.css" />
<link rel="stylesheet" href="./css/maven-theme.css" />
<link rel="stylesheet" href="./css/site.css" />
<link rel="stylesheet" href="./css/print.css" media="print" />
<script type="text/javascript" src="./js/checkstyle.js"></script>
<script type="text/javascript"
src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script type="text/javascript" src="./js/anchors.js"></script>
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<link rel="icon" href="./images/favicon.png" type="image/x-icon" />
<link rel="shortcut icon" href="./images/favicon.ico" type="image/ico" />
</head>
<body class="composite">
<div id="banner">
<a href="./" id="bannerLeft" title="Checkstyle"><img src="images/header-checkstyle-logo.png" alt="Checkstyle"/></a><a href="./" id="bannerRight" title="Checkstyle"><img src="images/header-right-ruller.png" alt="Checkstyle"/></a> <div class="clear">
<hr/>
</div>
</div>
<div id="breadcrumbs">
<div class="xright"><a href="" title="toTop">toTop</a> | <span id="publishDate">Last Published: 2024-12-28</span>
| <span id="projectVersion">Version: 10.21.1</span>
</div>
<div class="clear">
<hr/>
</div>
</div>
<div id="leftColumn">
<div id="navcolumn">
<h5>About</h5>
<ul>
<li class="none"><a href="index.html" title="Checkstyle">Checkstyle</a></li>
<li class="none"><a href="releasenotes.html" title="Release Notes">Release Notes</a></li>
<li class="none"><a href="consulting.html" title="Consulting">Consulting</a></li>
<li class="none"><a href="sponsoring.html" title="Sponsoring">Sponsoring</a></li>
</ul>
<h5>Documentation</h5>
<ul>
<li class="expanded"><a href="config.html" title="Configuration">Configuration</a>
<ul>
<li class="none"><strong>Property Types</strong></li>
<li class="none"><a href="config_system_properties.html" title="System Properties">System Properties</a></li>
</ul></li>
<li class="expanded"><a href="running.html" title="Running">Running</a>
<ul>
<li class="none"><a href="anttask.html" title="Ant Task">Ant Task</a></li>
<li class="none"><a href="cmdline.html" title="Command Line">Command Line</a></li>
</ul></li>
<li class="expanded"><a href="checks.html" title="Checks">Checks</a>
<ul>
<li class="collapsed"><a href="checks/annotation/index.html" title="Annotations">Annotations</a></li>
<li class="collapsed"><a href="checks/blocks/index.html" title="Block Checks">Block Checks</a></li>
<li class="collapsed"><a href="checks/design/index.html" title="Class Design">Class Design</a></li>
<li class="collapsed"><a href="checks/coding/index.html" title="Coding">Coding</a></li>
<li class="collapsed"><a href="checks/header/index.html" title="Headers">Headers</a></li>
<li class="collapsed"><a href="checks/imports/index.html" title="Imports">Imports</a></li>
<li class="collapsed"><a href="checks/javadoc/index.html" title="Javadoc Comments">Javadoc Comments</a></li>
<li class="collapsed"><a href="checks/metrics/index.html" title="Metrics">Metrics</a></li>
<li class="collapsed"><a href="checks/misc/index.html" title="Miscellaneous">Miscellaneous</a></li>
<li class="collapsed"><a href="checks/modifier/index.html" title="Modifiers">Modifiers</a></li>
<li class="collapsed"><a href="checks/naming/index.html" title="Naming Conventions">Naming Conventions</a></li>
<li class="collapsed"><a href="checks/regexp/index.html" title="Regexp">Regexp</a></li>
<li class="collapsed"><a href="checks/sizes/index.html" title="Size Violations">Size Violations</a></li>
<li class="collapsed"><a href="checks/whitespace/index.html" title="Whitespace">Whitespace</a></li>
</ul></li>
<li class="collapsed"><a href="filters/index.html" title="Filters">Filters</a></li>
<li class="collapsed"><a href="filefilters/index.html" title="File Filters">File Filters</a></li>
<li class="expanded"><a href="style_configs.html" title="Style Configurations">Style Configurations</a>
<ul>
<li class="none"><a href="google_style.html" title="Google's Style">Google's Style</a></li>
<li class="none"><a href="sun_style.html" title="Sun's Style">Sun's Style</a></li>
</ul></li>
</ul>
<h5>Developers</h5>
<ul>
<li class="expanded"><a href="extending.html" title="Extending Checkstyle">Extending Checkstyle</a>
<ul>
<li class="none"><a href="writingchecks.html" title="Writing Checks">Writing Checks</a></li>
<li class="none"><a href="writingjavadocchecks.html" title="Writing Javadoc Checks">Writing Javadoc Checks</a></li>
<li class="none"><a href="writingfilters.html" title="Writing Filters">Writing Filters</a></li>
<li class="none"><a href="writingfilefilters.html" title="Writing File Filters">Writing File Filters</a></li>
<li class="none"><a href="writinglisteners.html" title="Writing Listeners">Writing Listeners</a></li>
</ul></li>
<li class="none"><a href="contributing.html" title="Contributing">Contributing</a></li>
<li class="expanded"><a href="beginning_development.html" title="Beginning Development">Beginning Development</a>
<ul>
<li class="none"><a href="eclipse.html" title="Eclipse IDE">Eclipse IDE</a></li>
<li class="none"><a href="netbeans.html" title="NetBeans IDE">NetBeans IDE</a></li>
<li class="none"><a href="idea.html" title="IntelliJ IDE">IntelliJ IDE</a></li>
</ul></li>
<li class="none"><a href="apidocs/index.html" title="Javadoc">Javadoc</a></li>
</ul>
<h5>Project Documentation</h5>
<ul>
<li class="collapsed"><a href="project-info.html" title="Project Information">Project Information</a></li>
<li class="collapsed"><a href="project-reports.html" title="Project Reports">Project Reports</a></li>
</ul>
<a href="https://github.com/checkstyle/checkstyle" title="GitHub" class="poweredBy">
<img class="poweredBy" alt="GitHub" src="images/github_logo_social_coding_outlined.png" />
</a>
<a href="https://twitter.com/checkstyle_java/" title="Twitter" class="poweredBy">
<img class="poweredBy" alt="Twitter" src="images/twitter_button.png" />
</a>
<a href="https://stackoverflow.com/questions/tagged/checkstyle" title="Stackoverflow" class="poweredBy">
<img class="poweredBy" alt="Stackoverflow" src="images/stackoverflow.jpeg" />
</a>
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<img class="poweredBy" alt="GoogleGroups" src="images/groups.png" />
</a>
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<img class="poweredBy" alt="JProfiler" src="https://www.ej-technologies.com/images/product_banners/jprofiler_medium.png" />
</a>
</div>
</div>
<div id="bodyColumn">
<div id="contentBox">
<section>
<h2><a name="Content"></a>Content</h2>
<ul>
<li><a href="#Content">Content</a></li>
<li><a href="#Overview">Overview</a></li>
<li><a href="#boolean">boolean</a></li>
<li><a href="#byte">byte</a></li>
<li><a href="#byte.5B.5D">byte[]</a></li>
<li><a href="#char">char</a></li>
<li><a href="#char.5B.5D">char[]</a></li>
<li><a href="#double">double</a></li>
<li><a href="#double.5B.5D">double[]</a></li>
<li><a href="#float">float</a></li>
<li><a href="#float.5B.5D">float[]</a></li>
<li><a href="#int">int</a></li>
<li><a href="#int.5B.5D">int[]</a></li>
<li><a href="#long">long</a></li>
<li><a href="#long.5B.5D">long[]</a></li>
<li><a href="#short">short</a></li>
<li><a href="#short.5B.5D">short[]</a></li>
<li><a href="#AccessModifierOption.5B.5D">AccessModifierOption[]</a></li>
<li><a href="#BlockOption">BlockOption</a></li>
<li><a href="#ClosingParensOption">ClosingParensOption</a></li>
<li><a href="#ElementStyleOption">ElementStyleOption</a></li>
<li><a href="#File">File</a></li>
<li><a href="#ImportOrderOption">ImportOrderOption</a></li>
<li><a href="#JavadocContentLocationOption">JavadocContentLocationOption</a></li>
<li><a href="#LeftCurlyOption">LeftCurlyOption</a></li>
<li><a href="#LineSeparatorOption">LineSeparatorOption</a></li>
<li><a href="#PadOption">PadOption</a></li>
<li><a href="#Pattern">Pattern</a></li>
<li><a href="#Pattern.5B.5D">Pattern[]</a></li>
<li><a href="#RightCurlyOption">RightCurlyOption</a></li>
<li><a href="#Scope">Scope</a></li>
<li><a href="#SeverityLevel">SeverityLevel</a></li>
<li><a href="#String">String</a></li>
<li><a href="#String.5B.5D">String[]</a></li>
<li><a href="#TrailingArrayCommaOption">TrailingArrayCommaOption</a></li>
<li><a href="#URI">URI</a></li>
<li><a href="#WrapOption">WrapOption</a></li></ul>
</section>
<section>
<h2><a name="Overview"></a>Overview</h2>
<p>
Checkstyle is configured using properties, which are string
representations. This document describes how these string
representations are mapped to typed properties.
</p>
</section>
<section>
<h2><a name="boolean"></a>boolean</h2>
<p>
This type represents a boolean.
The following string representations will map to <code>true</code>:
</p>
<ul>
<li><code>yes</code></li>
<li><code>true</code></li>
<li><code>on</code></li>
</ul>
<p>Anything else will map to <code>false</code>.</p>
</section>
<section>
<h2><a name="byte"></a>byte</h2>
<p>
This type represents a byte. The string representation is
parsed using the <code>java.lang.Byte</code> class.
</p>
</section>
<section>
<h2><a name="byte.5B.5D"></a>byte[]</h2>
<p>
This type represents a set of bytes. The string representation
is parsed as a set of comma (',') separated bytes that are parsed
using the <code>java.lang.Byte</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated byte values.
</p>
</section>
<section>
<h2><a name="char"></a>char</h2>
<p>
This type represents a char. The string representation is
parsed using the <code>java.lang.Character</code> class.
</p>
</section>
<section>
<h2><a name="char.5B.5D"></a>char[]</h2>
<p>
This type represents a set of chars. The string representation
is parsed as a set of comma (',') separated chars that are parsed
using the <code>java.lang.Character</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated char values.
</p>
</section>
<section>
<h2><a name="double"></a>double</h2>
<p>
This type represents a double. The string representation is
parsed using the <code>java.lang.Double</code> class.
</p>
</section>
<section>
<h2><a name="double.5B.5D"></a>double[]</h2>
<p>
This type represents a set of doubles. The string representation
is parsed as a set of comma (',') separated doubles that are parsed
using the <code>java.lang.Double</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated integers. For example, the
following:
</p>
<div class="source">
<pre>
<property name="tokens" value="0.42,0.666"/>
</pre></div>
<p>can instead be expressed as:</p>
<div class="source">
<pre>
<property name="tokens" value="0.42"/>
<property name="tokens" value="0.666"/>
</pre></div>
</section>
<section>
<h2><a name="float"></a>float</h2>
<p>
This type represents a float. The string representation is
parsed using the <code>java.lang.Float</code> class.
</p>
</section>
<section>
<h2><a name="float.5B.5D"></a>float[]</h2>
<p>
This type represents a set of floats. The string representation
is parsed as a set of comma (',') separated floats that are parsed
using the <code>java.lang.Float</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated float values.
</p>
</section>
<section>
<h2><a name="int"></a>int</h2>
<p>
This type represents an integer. The string representation is
parsed using the <code>java.lang.Integer</code> class.
</p>
</section>
<section>
<h2><a name="int.5B.5D"></a>int[]</h2>
<p>
This type represents a set of integers. The string representation
is parsed as a set of comma (',') separated integers that are parsed
using the <code>java.lang.Integer</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated integers. For example, the
following:
</p>
<div class="source">
<pre>
<property name="tokens" value="42,666"/>
</pre></div>
<p>can instead be expressed as:</p>
<div class="source">
<pre>
<property name="tokens" value="42"/>
<property name="tokens" value="666"/>
</pre></div>
</section>
<section>
<h2><a name="long"></a>long</h2>
<p>
This type represents a long. The string representation is
parsed using the <code>java.lang.Long</code> class.
</p>
</section>
<section>
<h2><a name="long.5B.5D"></a>long[]</h2>
<p>
This type represents a set of longs. The string representation
is parsed as a set of comma (',') separated longs that are parsed
using the <code>java.lang.Long</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated long values.
</p>
</section>
<section>
<h2><a name="short"></a>short</h2>
<p>
This type represents a short. The string representation is
parsed using the <code>java.lang.Short</code> class.
</p>
</section>
<section>
<h2><a name="short.5B.5D"></a>short[]</h2>
<p>
This type represents a set of shorts. The string representation
is parsed as a set of comma (',') separated shorts that are parsed
using the <code>java.lang.Short</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated short values.
</p>
</section>
<section>
<h2><a name="AccessModifierOption.5B.5D"></a>AccessModifierOption[]</h2>
<p>This type represents Java access modifiers.</p>
<ul>
<li><code>public</code></li>
<li><code>protected</code></li>
<li><code>package</code></li>
<li><code>private</code></li>
</ul>
</section>
<section>
<h2><a name="BlockOption"></a>BlockOption</h2>
<p>
This type represents the policy for checking block statements. The
following table describes the valid options:
</p>
<div class="wrapper">
<table border="0" class="bodyTable" summary="block options">
<tr class="a">
<td align="left">Option</td>
<td>Definition</td>
</tr>
<tr class="b">
<td align="left"><code>text</code></td>
<td>
Require that there is some text in the block. For example:
<div class="wrapper">
<div>
<pre>
catch (Exception ex) {
// This is a bad coding practice
}
</pre></div>
</div>
</td>
</tr>
<tr class="a">
<td align="left"><code>statement</code></td>
<td>
Require that there is a statement in the block. For example:
<div class="wrapper">
<div>
<pre>
finally {
lock.release();
}
</pre></div>
</div>
</td>
</tr>
</table>
</div>
</section>
<section>
<h2><a name="ClosingParensOption"></a>ClosingParensOption</h2>
<p>
This type represents the policy for the styles for the ending
parenthesis. The following table describes the valid options:
</p>
<div class="wrapper">
<table border="0" class="bodyTable" summary="closingParens options">
<tr class="a">
<td align="left">Option</td>
<td>Definition</td>
</tr>
<tr class="b">
<td align="left"><code>always</code></td>
<td>
Example:
<div class="wrapper">
<div>
<pre>@Deprecated()</pre></div>
</div>
</td>
</tr>
<tr class="a">
<td align="left"><code>never</code></td>
<td>
Example:
<div class="wrapper">
<div>
<pre>@Deprecated</pre></div>
</div>
</td>
</tr>
<tr class="b">
<td align="left"><code>ignore</code></td>
<td>
Anything goes.
</td>
</tr>
</table>
</div>
</section>
<section>
<h2><a name="ElementStyleOption"></a>ElementStyleOption</h2>
<p>
This type represents the policy for the styles for defining
elements in an annotation. The following table
describes the valid options:
</p>
<div class="wrapper">
<table border="0" class="bodyTable" summary="elementStyle options">
<tr class="a">
<td align="left">Option</td>
<td>Definition</td>
</tr>
<tr class="b">
<td align="left"><code>expanded</code></td>
<td>
The expanded version is sometimes referred to as "named parameters"
in other languages.
Example:
<div class="wrapper">
<div>
<pre>@SuppressWarnings(value={"unchecked","unused",})</pre></div>
</div>
Example of violation:
<div class="wrapper">
<div>
<pre>@SuppressWarnings({"unchecked","unused",})</pre></div>
</div>
</td>
</tr>
<tr class="a">
<td align="left"><code>compact</code></td>
<td>
This style can only be used when there is an element called 'value'
which is either the sole element or all other elements have default
values.
Example:
<div class="wrapper">
<div>
<pre>
@SuppressWarnings({"unchecked","unused",})
@SuppressWarnings("unchecked")
</pre></div>
</div>
Example of violation:
<div class="wrapper">
<div>
<pre>
@SuppressWarnings(value = {"unchecked","unused",})
@SuppressWarnings(value = "unchecked")
</pre></div>
</div>
</td>
</tr>
<tr class="b">
<td align="left"><code>compact_no_array</code></td>
<td>
It is similar to the <code>compact</code> style but
single value arrays are flagged. With annotations a single value
array does not need to be placed in an array initializer.
Example:
<div class="wrapper">
<div>
<pre>
@SuppressWarnings("unchecked")
@MyAnnotation(someArray = "some value")
</pre></div>
</div>
Example of violation:
<div class="wrapper">
<div>
<pre>
@SuppressWarnings({"unchecked"})
@MyAnnotation(someArray = {"some value"})
</pre></div>
</div>
</td>
</tr>
<tr class="a">
<td align="left"><code>ignore</code></td>
<td>
Anything goes.
</td>
</tr>
</table>
</div>
</section>
<section>
<h2><a name="File"></a>File</h2>
<p>
This type represents a local file. Unlike the <a href="#URI">uri</a> type,
which implies read only and not modifiable access to the resource,
a property of this type indicates files whose contents can be modified by Checkstyle.
</p>
</section>
<section>
<h2><a name="ImportOrderOption"></a>ImportOrderOption</h2>
<p>
This type represents the policy for checking imports order.
The following table describes the valid options:
</p>
<div class="wrapper">
<table border="0" class="bodyTable" summary="ImportOrderOptions">
<tr class="a">
<td align="left">Option</td>
<td>Definition</td>
</tr>
<tr class="b">
<td align="left"><code>top</code></td>
<td>All static imports are at the top.
Groups for static import are defined by the property 'staticGroups'.
The blank line between groups is driven by the property 'separatedStaticGroups'.
For example:
<div class="wrapper">
<div>
<pre>
import static a.b.C.*;
import static x.y.Z.*;
import a.b.D;
import x.y.Z;</pre></div>
</div>
</td>
</tr>
<tr class="a">
<td align="left"><code>above</code></td>
<td>All static imports are above the local group. For example:
<div class="wrapper">
<div>
<pre>
import static a.b.C.*;
import a.b.D;
import static x.y.Z.*;
import x.y.Z;</pre></div>
</div>
</td>
</tr>
<tr class="b">
<td align="left"><code>inflow</code></td>
<td>All static imports are processed like non static
imports. For example:
<div class="wrapper">
<div>
<pre>
import static a.b.C.*;
import a.b.D;
import x.y.Z;
import static x.y.Z.*;</pre></div>
</div>
</td>
</tr>
<tr class="a">
<td align="left"><code>under</code></td>
<td>All static imports are under the local group. For example:
<div class="wrapper">
<div>
<pre>
import a.b.D;
import static a.b.C.*;
import x.y.Z;
import static x.y.Z.*;</pre></div>
</div>
</td>
</tr>
<tr class="b">
<td align="left"><code>bottom</code></td>
<td>All static imports are at the bottom.
Groups for static import are defined by the property 'staticGroups'.
The blank line between groups is driven by the property 'separatedStaticGroups'.
For example:
<div class="wrapper">
<div>
<pre>
import a.b.D;
import x.y.Z;
import static a.b.C.*;
import static x.y.Z.*;</pre></div>
</div>
</td>
</tr>
</table>
</div>
</section>
<section>
<h2><a name="JavadocContentLocationOption"></a>JavadocContentLocationOption</h2>
<p>
This type represents policy on placement of the Javadoc content.
The following table describes the valid options:
</p>
<div class="wrapper">
<table border="0" class="bodyTable" summary="JavadocContentLocationOption options">
<tr class="a">
<td align="left">Option</td>
<td>Definition</td>
</tr>
<tr class="b">
<td align="left"><code>FIRST_LINE</code></td>
<td>
Represents the policy for Javadoc content starts from the same line
as <code>/**</code>.
Example:
<div class="wrapper">
<div>
<pre>
/** Summary text.
* More details.
*/
public void method();
</pre></div>
</div>
This style is also known as "scala" style.
</td>
</tr>
<tr class="a">
<td align="left"><code>SECOND_LINE</code></td>
<td>
Represents the policy for Javadoc content starts from the next line
after <code>/**</code>.
Example:
<div class="wrapper">
<div>
<pre>
/**
* Summary text.
* More details.
*/
public void method();
</pre></div>
</div>
This style is common to java projects.
</td>
</tr>
</table>
</div>
</section>
<section>
<h2><a name="LeftCurlyOption"></a>LeftCurlyOption</h2>
<p>
This type represents the policy for checking the placement of a
left curly brace (<code>'{'</code>). The following table
describes the valid options:
</p>
<div class="wrapper">
<table border="0" class="bodyTable" summary="left curly options">
<tr class="a">
<td align="left">Option</td>
<td>Definition</td>
</tr>
<tr class="b">
<td align="left"><code>eol</code></td>
<td>
The brace must always be on the end of the line. For example:#
<div class="wrapper">
<div>
<pre>
if (condition) {
...
</pre></div>
</div>
</td>
</tr>
<tr class="a">
<td align="left"><code>nl</code></td>
<td>
The brace must always be on a new line. For example:
<div class="wrapper">
<div>
<pre>
if (condition)
{
...
</pre></div>
</div>
</td>
</tr>
<tr class="b">
<td align="left"><code>nlow</code></td>
<td>
If the statement/expression/declaration connected to the brace spans multiple lines,
then apply <code>nl</code> rule. Otherwise, apply the <code>eol</code> rule.
<code>nlow</code> is a mnemonic for "new line on wrap".
For the example above Checkstyle will enforce:
<div class="wrapper">
<div>
<pre>
if (condition) {
...
</pre></div>
</div>
But for a statement spanning multiple lines, Checkstyle will
enforce:
<div class="wrapper">
<div>
<pre>
if (condition1 && condition2 &&
condition3 && condition4)
{
...
</pre></div>
</div>
</td>
</tr>
</table>
</div>
</section>
<section>
<h2><a name="LineSeparatorOption"></a>LineSeparatorOption</h2>
<p>
This type represents the policy for line returns. The
following table describes the valid options:
</p>
<div class="wrapper">
<table border="0" class="bodyTable" summary="line separator options">
<tr class="a">
<td align="left">Option</td>
<td>Definition</td>