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<div class="subTitle">org.apache.shiro</div>
<h2 title="Class SecurityUtils" class="title">Class SecurityUtils</h2>
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<pre>public abstract class <a href="../../../src-html/org/apache/shiro/SecurityUtils.html#line.31">SecurityUtils</a>
extends <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
<div class="block">Accesses the currently accessible <code>Subject</code> for the calling code depending on runtime environment.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>0.2</dd></dl>
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<td class="colOne"><code><strong><a href="../../../org/apache/shiro/SecurityUtils.html#SecurityUtils()">SecurityUtils</a></strong>()</code>&nbsp;</td>
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<td class="colFirst"><code>static <a href="../../../org/apache/shiro/mgt/SecurityManager.html" title="interface in org.apache.shiro.mgt">SecurityManager</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/shiro/SecurityUtils.html#getSecurityManager()">getSecurityManager</a></strong>()</code>
<div class="block">Returns the SecurityManager accessible to the calling code.</div>
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<td class="colFirst"><code>static <a href="../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/shiro/SecurityUtils.html#getSubject()">getSubject</a></strong>()</code>
<div class="block">Returns the currently accessible <code>Subject</code> available to the calling code depending on
runtime environment.</div>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/shiro/SecurityUtils.html#setSecurityManager(org.apache.shiro.mgt.SecurityManager)">setSecurityManager</a></strong>(<a href="../../../org/apache/shiro/mgt/SecurityManager.html" title="interface in org.apache.shiro.mgt">SecurityManager</a>&nbsp;securityManager)</code>
<div class="block">Sets a VM (static) singleton SecurityManager, specifically for transparent use in the
<a href="../../../org/apache/shiro/SecurityUtils.html#getSubject()"><code>getSubject()</code></a> implementation.</div>
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<h4>SecurityUtils</h4>
<pre>public&nbsp;<a href="../../../src-html/org/apache/shiro/SecurityUtils.html#line.31">SecurityUtils</a>()</pre>
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<h4>getSubject</h4>
<pre>public static&nbsp;<a href="../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;<a href="../../../src-html/org/apache/shiro/SecurityUtils.html#line.53">getSubject</a>()</pre>
<div class="block">Returns the currently accessible <code>Subject</code> available to the calling code depending on
runtime environment.
<p/>
This method is provided as a way of obtaining a <code>Subject</code> without having to resort to
implementation-specific methods. It also allows the Shiro team to change the underlying implementation of
this method in the future depending on requirements/updates without affecting your code that uses it.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the currently accessible <code>Subject</code> accessible to the calling code.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://java.sun.com/javase/6/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if no <a href="../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject"><code>Subject</code></a> instance or
<a href="../../../org/apache/shiro/mgt/SecurityManager.html" title="interface in org.apache.shiro.mgt"><code>SecurityManager</code></a> instance is available with which to obtain
a <code>Subject</code>, which which is considered an invalid application configuration
- a Subject should <em>always</em> be available to the caller.</dd></dl>
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<h4>setSecurityManager</h4>
<pre>public static&nbsp;void&nbsp;<a href="../../../src-html/org/apache/shiro/SecurityUtils.html#line.94">setSecurityManager</a>(<a href="../../../org/apache/shiro/mgt/SecurityManager.html" title="interface in org.apache.shiro.mgt">SecurityManager</a>&nbsp;securityManager)</pre>
<div class="block">Sets a VM (static) singleton SecurityManager, specifically for transparent use in the
<a href="../../../org/apache/shiro/SecurityUtils.html#getSubject()"><code>getSubject()</code></a> implementation.
<p/>
<b>This method call exists mainly for framework development support. Application developers should rarely,
if ever, need to call this method.</b>
<p/>
The Shiro development team prefers that SecurityManager instances are non-static application singletons
and <em>not</em> VM static singletons. Application singletons that do not use static memory require some sort
of application configuration framework to maintain the application-wide SecurityManager instance for you
(for example, Spring or EJB3 environments) such that the object reference does not need to be static.
<p/>
In these environments, Shiro acquires Subject data based on the currently executing Thread via its own
framework integration code, and this is the preferred way to use Shiro.
<p/>
However in some environments, such as a standalone desktop application or Applets that do not use Spring or
EJB or similar config frameworks, a VM-singleton might make more sense (although the former is still preferred).
In these environments, setting the SecurityManager via this method will automatically enable the
<a href="../../../org/apache/shiro/SecurityUtils.html#getSubject()"><code>getSubject()</code></a> call to function with little configuration.
<p/>
For example, in these environments, this will work:
<pre>
DefaultSecurityManager securityManager = new <a href="../../../org/apache/shiro/mgt/DefaultSecurityManager.html" title="class in org.apache.shiro.mgt"><code>DefaultSecurityManager</code></a>();
securityManager.setRealms( ... ); //one or more Realms
<b>SecurityUtils.setSecurityManager( securityManager );</b></pre>
<p/>
And then anywhere in the application code, the following call will return the application's Subject:
<pre>
Subject currentUser = SecurityUtils.getSubject();</pre></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>securityManager</code> - the securityManager instance to set as a VM static singleton.</dd></dl>
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<h4>getSecurityManager</h4>
<pre>public static&nbsp;<a href="../../../org/apache/shiro/mgt/SecurityManager.html" title="interface in org.apache.shiro.mgt">SecurityManager</a>&nbsp;<a href="../../../src-html/org/apache/shiro/SecurityUtils.html#line.114">getSecurityManager</a>()
throws <a href="../../../org/apache/shiro/UnavailableSecurityManagerException.html" title="class in org.apache.shiro">UnavailableSecurityManagerException</a></pre>
<div class="block">Returns the SecurityManager accessible to the calling code.
<p/>
This implementation favors acquiring a thread-bound <code>SecurityManager</code> if it can find one. If one is
not available to the executing thread, it will attempt to use the static singleton if available (see the
<a href="../../../org/apache/shiro/SecurityUtils.html#setSecurityManager(org.apache.shiro.mgt.SecurityManager)"><code>setSecurityManager</code></a> method for more on the static singleton).
<p/>
If neither the thread-local or static singleton instances are available, this method throws an
<code>UnavailableSecurityManagerException</code> to indicate an error - a SecurityManager should always be accessible
to calling code in an application. If it is not, it is likely due to a Shiro configuration problem.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the SecurityManager accessible to the calling code.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/apache/shiro/UnavailableSecurityManagerException.html" title="class in org.apache.shiro">UnavailableSecurityManagerException</a></code> - if there is no <code>SecurityManager</code> instance available to the
calling code, which typically indicates an invalid application configuration.</dd></dl>
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