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 <div class="subTitle">org.apache.shiro.mgt</div>
 <h2 title="Class DefaultSubjectDAO" class="title">Class DefaultSubjectDAO</h2>
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 <li>org.apache.shiro.mgt.DefaultSubjectDAO</li>
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 <dt>All Implemented Interfaces:</dt>
 <dd><a href="../../../../org/apache/shiro/mgt/SubjectDAO.html" title="interface in org.apache.shiro.mgt">SubjectDAO</a></dd>
 </dl>
 <hr>
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 <pre>public class <a href="../../../../src-html/org/apache/shiro/mgt/DefaultSubjectDAO.html#line.82">DefaultSubjectDAO</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>
 implements <a href="../../../../org/apache/shiro/mgt/SubjectDAO.html" title="interface in org.apache.shiro.mgt">SubjectDAO</a></pre>
 <div class="block">Default <code>SubjectDAO</code> implementation that stores Subject state in the Subject's Session by default (but this
  can be disabled - see below).  The Subject instance
  can be re-created at a later time by first acquiring the associated Session (typically from a
  <a href="../../../../org/apache/shiro/session/mgt/SessionManager.html" title="interface in org.apache.shiro.session.mgt"><code>SessionManager</code></a>) via a session ID or session key and then
  building a <code>Subject</code> instance from <code>Session</code> attributes.
  <h2>Controlling how Sessions are used</h2>
  Whether or not a <code>Subject</code>'s <code>Session</code> is used or not to persist its own state is controlled on a
  <em>per-Subject</em> basis as determined by the configured
  <a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#setSessionStorageEvaluator(org.apache.shiro.mgt.SessionStorageEvaluator)"><code>sessionStorageEvaluator</code></a>.
  The default <code>Evaluator</code> is a <a href="../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt"><code>DefaultSessionStorageEvaluator</code></a>, which supports enabling or disabling
  session usage for Subject persistence at a global level for all subjects (and defaults to allowing sessions to be
  used).
  <h3>Disabling Session Persistence Entirely</h3>
  Because the default <code>SessionStorageEvaluator</code> instance is a <a href="../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt"><code>DefaultSessionStorageEvaluator</code></a>, you
  can disable Session usage for Subject state entirely by configuring that instance directly, e.g.:
  <pre>
      ((DefaultSessionStorageEvaluator)sessionDAO.getSessionStorageEvaluator()).setSessionStorageEnabled(false);
  </pre>
  or, for example, in <code>shiro.ini</code>:
  <pre>
      securityManager.subjectDAO.sessionStorageEvaluator.sessionStorageEnabled = false
  </pre>
  but <b>note:</b> ONLY do this your
  application is 100% stateless and you <em>DO NOT</em> need subjects to be remembered across remote
  invocations, or in a web environment across HTTP requests.
  <h3>Supporting Both Stateful and Stateless Subject paradigms</h3>
  Perhaps your application needs to support a hybrid approach of both stateful and stateless Subjects:
  <ul>
  <li>Stateful: Stateful subjects might represent web end-users that need their identity and authentication
  state to be remembered from page to page.</li>
  <li>Stateless: Stateless subjects might represent API clients (e.g. REST clients) that authenticate on every
  request, and therefore don't need authentication state to be stored across requests in a session.</li>
  </ul>
  To support the hybrid <em>per-Subject</em> approach, you will need to create your own implementation of the
  <a href="../../../../org/apache/shiro/mgt/SessionStorageEvaluator.html" title="interface in org.apache.shiro.mgt"><code>SessionStorageEvaluator</code></a> interface and configure it via the
  <a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#setSessionStorageEvaluator(org.apache.shiro.mgt.SessionStorageEvaluator)"><code>setSessionStorageEvaluator(SessionStorageEvaluator)</code></a> method, or, with <code>shiro.ini</code>:
  <pre>
      myEvaluator = com.my.CustomSessionStorageEvaluator
      securityManager.subjectDAO.sessionStorageEvaluator = $myEvaluator
  </pre>
  <p/>
  Unless overridden, the default evaluator is a <a href="../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt"><code>DefaultSessionStorageEvaluator</code></a>, which enables session usage for
  Subject state by default.</div>
 <dl><dt><span class="strong">Since:</span></dt>
   <dd>1.2</dd>
 <dt><span class="strong">See Also:</span></dt><dd><a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#isSessionStorageEnabled(org.apache.shiro.subject.Subject)"><code>isSessionStorageEnabled(org.apache.shiro.subject.Subject)</code></a>,
 <a href="../../../../org/apache/shiro/mgt/SessionStorageEvaluator.html" title="interface in org.apache.shiro.mgt"><code>SessionStorageEvaluator</code></a>,
 <a href="../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt"><code>DefaultSessionStorageEvaluator</code></a></dd></dl>
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 <th class="colOne" scope="col">Constructor and Description</th>
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 <td class="colOne"><code><strong><a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#DefaultSubjectDAO()">DefaultSubjectDAO</a></strong>()</code>&nbsp;</td>
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 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Method and Description</th>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><strong><a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#delete(org.apache.shiro.subject.Subject)">delete</a></strong>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</code>
 <div class="block">Removes any existing subject state from the subject's session (if the session exists).</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code><a href="../../../../org/apache/shiro/mgt/SessionStorageEvaluator.html" title="interface in org.apache.shiro.mgt">SessionStorageEvaluator</a></code></td>
 <td class="colLast"><code><strong><a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#getSessionStorageEvaluator()">getSessionStorageEvaluator</a></strong>()</code>
 <div class="block">Returns the <code>SessionStorageEvaluator</code> that will determine if a <code>Subject</code>'s state may be persisted in
  the Subject's session.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>protected boolean</code></td>
 <td class="colLast"><code><strong><a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#isSessionStorageEnabled(org.apache.shiro.subject.Subject)">isSessionStorageEnabled</a></strong>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</code>
 <div class="block">Determines if the subject's session will be used to persist subject state or not.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>protected void</code></td>
 <td class="colLast"><code><strong><a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#mergeAuthenticationState(org.apache.shiro.subject.Subject)">mergeAuthenticationState</a></strong>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</code>
 <div class="block">Merges the Subject's current authentication state with whatever may be in
  any available session.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>protected void</code></td>
 <td class="colLast"><code><strong><a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#mergePrincipals(org.apache.shiro.subject.Subject)">mergePrincipals</a></strong>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</code>
 <div class="block">Merges the Subject's current <a href="../../../../org/apache/shiro/subject/Subject.html#getPrincipals()"><code>Subject.getPrincipals()</code></a> with whatever may be in
  any available session.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>protected void</code></td>
 <td class="colLast"><code><strong><a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#removeFromSession(org.apache.shiro.subject.Subject)">removeFromSession</a></strong>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</code>
 <div class="block">Removes any existing subject state from the Subject's session (if the session exists).</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code><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/mgt/DefaultSubjectDAO.html#save(org.apache.shiro.subject.Subject)">save</a></strong>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</code>
 <div class="block">Saves the subject's state to the subject's <a href="../../../../org/apache/shiro/subject/Subject.html#getSession()"><code>session</code></a> only
  if <a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#isSessionStorageEnabled(org.apache.shiro.subject.Subject)"><code>sessionStorageEnabled(subject)</code></a>.</div>
 </td>
 </tr>
 <tr class="rowColor">
 <td class="colFirst"><code>protected void</code></td>
 <td class="colLast"><code><strong><a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#saveToSession(org.apache.shiro.subject.Subject)">saveToSession</a></strong>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</code>
 <div class="block">Saves the subject's state (it's principals and authentication state) to its
  <a href="../../../../org/apache/shiro/subject/Subject.html#getSession()"><code>session</code></a>.</div>
 </td>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><strong><a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#setSessionStorageEvaluator(org.apache.shiro.mgt.SessionStorageEvaluator)">setSessionStorageEvaluator</a></strong>(<a href="../../../../org/apache/shiro/mgt/SessionStorageEvaluator.html" title="interface in org.apache.shiro.mgt">SessionStorageEvaluator</a>&nbsp;sessionStorageEvaluator)</code>
 <div class="block">Sets the <code>SessionStorageEvaluator</code> that will determine if a <code>Subject</code>'s state may be persisted in
  the Subject's session.</div>
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 <code><a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</a></code></li>
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 <h4>DefaultSubjectDAO</h4>
 <pre>public&nbsp;<a href="../../../../src-html/org/apache/shiro/mgt/DefaultSubjectDAO.html#line.91">DefaultSubjectDAO</a>()</pre>
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 <h4>isSessionStorageEnabled</h4>
 <pre>protected&nbsp;boolean&nbsp;<a href="../../../../src-html/org/apache/shiro/mgt/DefaultSubjectDAO.html#line.107">isSessionStorageEnabled</a>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</pre>
 <div class="block">Determines if the subject's session will be used to persist subject state or not.  This implementation
  merely delegates to the internal <a href="../../../../org/apache/shiro/mgt/SessionStorageEvaluator.html" title="interface in org.apache.shiro.mgt"><code>SessionStorageEvaluator</code></a> (a
  <code>DefaultSessionStorageEvaluator</code> by default).</div>
 <dl><dt><span class="strong">Parameters:</span></dt><dd><code>subject</code> - the subject to inspect to determine if the subject's session will be used to persist subject
                 state or not.</dd>
 <dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the subject's session will be used to persist subject state, <code>false</code> otherwise.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#setSessionStorageEvaluator(org.apache.shiro.mgt.SessionStorageEvaluator)"><code>setSessionStorageEvaluator(SessionStorageEvaluator)</code></a>,
 <a href="../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt"><code>DefaultSessionStorageEvaluator</code></a></dd></dl>
 </li>
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 <h4>getSessionStorageEvaluator</h4>
 <pre>public&nbsp;<a href="../../../../org/apache/shiro/mgt/SessionStorageEvaluator.html" title="interface in org.apache.shiro.mgt">SessionStorageEvaluator</a>&nbsp;<a href="../../../../src-html/org/apache/shiro/mgt/DefaultSubjectDAO.html#line.119">getSessionStorageEvaluator</a>()</pre>
 <div class="block">Returns the <code>SessionStorageEvaluator</code> that will determine if a <code>Subject</code>'s state may be persisted in
  the Subject's session.  The default instance is a <a href="../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt"><code>DefaultSessionStorageEvaluator</code></a>.</div>
 <dl><dt><span class="strong">Returns:</span></dt><dd>the <code>SessionStorageEvaluator</code> that will determine if a <code>Subject</code>'s state may be persisted in
          the Subject's session.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt"><code>DefaultSessionStorageEvaluator</code></a></dd></dl>
 </li>
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 <h4>setSessionStorageEvaluator</h4>
 <pre>public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/mgt/DefaultSubjectDAO.html#line.131">setSessionStorageEvaluator</a>(<a href="../../../../org/apache/shiro/mgt/SessionStorageEvaluator.html" title="interface in org.apache.shiro.mgt">SessionStorageEvaluator</a>&nbsp;sessionStorageEvaluator)</pre>
 <div class="block">Sets the <code>SessionStorageEvaluator</code> that will determine if a <code>Subject</code>'s state may be persisted in
  the Subject's session. The default instance is a <a href="../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt"><code>DefaultSessionStorageEvaluator</code></a>.</div>
 <dl><dt><span class="strong">Parameters:</span></dt><dd><code>sessionStorageEvaluator</code> - the <code>SessionStorageEvaluator</code> that will determine if a <code>Subject</code>'s
                                 state may be persisted in the Subject's session.</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../../org/apache/shiro/mgt/DefaultSessionStorageEvaluator.html" title="class in org.apache.shiro.mgt"><code>DefaultSessionStorageEvaluator</code></a></dd></dl>
 </li>
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 <h4>save</h4>
 <pre>public&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/mgt/DefaultSubjectDAO.html#line.145">save</a>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</pre>
 <div class="block">Saves the subject's state to the subject's <a href="../../../../org/apache/shiro/subject/Subject.html#getSession()"><code>session</code></a> only
  if <a href="../../../../org/apache/shiro/mgt/DefaultSubjectDAO.html#isSessionStorageEnabled(org.apache.shiro.subject.Subject)"><code>sessionStorageEnabled(subject)</code></a>.  If session storage is not enabled
  for the specific <code>Subject</code>, this method does nothing.
  <p/>
  In either case, the argument <code>Subject</code> is returned directly (a new Subject instance is not created).</div>
 <dl>
 <dt><strong>Specified by:</strong></dt>
 <dd><code><a href="../../../../org/apache/shiro/mgt/SubjectDAO.html#save(org.apache.shiro.subject.Subject)">save</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/shiro/mgt/SubjectDAO.html" title="interface in org.apache.shiro.mgt">SubjectDAO</a></code></dd>
 <dt><span class="strong">Parameters:</span></dt><dd><code>subject</code> - the Subject instance for which its state will be created or updated.</dd>
 <dt><span class="strong">Returns:</span></dt><dd>the same <code>Subject</code> passed in (a new Subject instance is not created).</dd></dl>
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 <h4>saveToSession</h4>
 <pre>protected&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/mgt/DefaultSubjectDAO.html#line.164">saveToSession</a>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</pre>
 <div class="block">Saves the subject's state (it's principals and authentication state) to its
  <a href="../../../../org/apache/shiro/subject/Subject.html#getSession()"><code>session</code></a>.  The session can be retrieved at a later time
  (typically from a <a href="../../../../org/apache/shiro/session/mgt/SessionManager.html" title="interface in org.apache.shiro.session.mgt"><code>SessionManager</code></a> to be used to recreate
  the <code>Subject</code> instance.</div>
 <dl><dt><span class="strong">Parameters:</span></dt><dd><code>subject</code> - the subject for which state will be persisted to its session.</dd></dl>
 </li>
 </ul>
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 <h4>mergePrincipals</h4>
 <pre>protected&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/mgt/DefaultSubjectDAO.html#line.177">mergePrincipals</a>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</pre>
 <div class="block">Merges the Subject's current <a href="../../../../org/apache/shiro/subject/Subject.html#getPrincipals()"><code>Subject.getPrincipals()</code></a> with whatever may be in
  any available session.  Only updates the Subject's session if the session does not match the current principals
  state.</div>
 <dl><dt><span class="strong">Parameters:</span></dt><dd><code>subject</code> - the Subject for which principals will potentially be merged into the Subject's session.</dd></dl>
 </li>
 </ul>
 <a name="mergeAuthenticationState(org.apache.shiro.subject.Subject)">
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 <h4>mergeAuthenticationState</h4>
 <pre>protected&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/mgt/DefaultSubjectDAO.html#line.233">mergeAuthenticationState</a>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</pre>
 <div class="block">Merges the Subject's current authentication state with whatever may be in
  any available session.  Only updates the Subject's session if the session does not match the current
  authentication state.</div>
 <dl><dt><span class="strong">Parameters:</span></dt><dd><code>subject</code> - the Subject for which principals will potentially be merged into the Subject's session.</dd></dl>
 </li>
 </ul>
 <a name="removeFromSession(org.apache.shiro.subject.Subject)">
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 <pre>protected&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/mgt/DefaultSubjectDAO.html#line.267">removeFromSession</a>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</pre>
 <div class="block">Removes any existing subject state from the Subject's session (if the session exists).  If the session
  does not exist, this method does not do anything.</div>
 <dl><dt><span class="strong">Parameters:</span></dt><dd><code>subject</code> - the subject for which any existing subject state will be removed from its session.</dd></dl>
 </li>
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 <h4>delete</h4>
 <pre>public&nbsp;void&nbsp;<a href="../../../../src-html/org/apache/shiro/mgt/DefaultSubjectDAO.html#line.280">delete</a>(<a href="../../../../org/apache/shiro/subject/Subject.html" title="interface in org.apache.shiro.subject">Subject</a>&nbsp;subject)</pre>
 <div class="block">Removes any existing subject state from the subject's session (if the session exists).</div>
 <dl>
 <dt><strong>Specified by:</strong></dt>
 <dd><code><a href="../../../../org/apache/shiro/mgt/SubjectDAO.html#delete(org.apache.shiro.subject.Subject)">delete</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../org/apache/shiro/mgt/SubjectDAO.html" title="interface in org.apache.shiro.mgt">SubjectDAO</a></code></dd>
 <dt><span class="strong">Parameters:</span></dt><dd><code>subject</code> - the Subject instance for which any persistent state should be deleted.</dd></dl>
 </li>
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