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 <div class="header">
 <div class="subTitle">org.apache.felix.dm.tracker</div>
 <h2 title="Class BundleTracker" class="title">Class BundleTracker</h2>
 </div>
 <div class="contentContainer">
 <ul class="inheritance">
 <li>java.lang.Object</li>
 <li>
 <ul class="inheritance">
 <li>org.apache.felix.dm.tracker.BundleTracker</li>
 </ul>
 </li>
 </ul>
 <div class="description">
 <ul class="blockList">
 <li class="blockList">
 <dl>
 <dt>All Implemented Interfaces:</dt>
 <dd><a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html" title="interface in org.apache.felix.dm.tracker">BundleTrackerCustomizer</a></dd>
 </dl>
 <hr>
 <br>
 <pre>public class <span class="typeNameLabel">BundleTracker</span>
 extends java.lang.Object
 implements <a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html" title="interface in org.apache.felix.dm.tracker">BundleTrackerCustomizer</a></pre>
 <div class="block">The <code>BundleTracker</code> class simplifies tracking bundles much like
  the <code>ServiceTracker</code> simplifies tracking services.
  <p>
  A <code>BundleTracker</code> is constructed with state criteria and a
  <code>BundleTrackerCustomizer</code> object. A <code>BundleTracker</code> can
  use the <code>BundleTrackerCustomizer</code> to select which bundles are
  tracked and to create a customized object to be tracked with the bundle. The
  <code>BundleTracker</code> can then be opened to begin tracking all bundles
  whose state matches the specified state criteria.
  <p>
  The <code>getBundles</code> method can be called to get the
  <code>Bundle</code> objects of the bundles being tracked. The
  <code>getObject</code> method can be called to get the customized object for
  a tracked bundle.
  <p>
  The <code>BundleTracker</code> class is thread-safe. It does not call a
  <code>BundleTrackerCustomizer</code> while holding any locks.
  <code>BundleTrackerCustomizer</code> implementations must also be
  thread-safe.</div>
 <dl>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>1.4</dd>
 </dl>
 </li>
 </ul>
 </div>
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 <caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Field and Description</th>
 </tr>
 <tr class="altColor">
 <td class="colFirst"><code>protected org.osgi.framework.BundleContext</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#context">context</a></span></code>
 <div class="block">The Bundle Context used by this <code>BundleTracker</code>.</div>
 </td>
 </tr>
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 <caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
 <tr>
 <th class="colOne" scope="col">Constructor and Description</th>
 </tr>
 <tr class="altColor">
 <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#BundleTracker-org.osgi.framework.BundleContext-int-org.apache.felix.dm.tracker.BundleTrackerCustomizer-">BundleTracker</a></span>(org.osgi.framework.BundleContext&nbsp;context,
              int&nbsp;stateMask,
              <a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html" title="interface in org.apache.felix.dm.tracker">BundleTrackerCustomizer</a>&nbsp;customizer)</code>
 <div class="block">Create a <code>BundleTracker</code> for bundles whose state is present in
  the specified state mask.</div>
 </td>
 </tr>
 </table>
 </li>
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 <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
 <tr>
 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Method and Description</th>
 </tr>
 <tr id="i0" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#addedBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-java.lang.Object-">addedBundle</a></span>(org.osgi.framework.Bundle&nbsp;bundle,
            org.osgi.framework.BundleEvent&nbsp;event,
            java.lang.Object&nbsp;object)</code>
 <div class="block">marrs: A bundle has been added to the BundleTracker.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>java.lang.Object</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#addingBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-">addingBundle</a></span>(org.osgi.framework.Bundle&nbsp;bundle,
             org.osgi.framework.BundleEvent&nbsp;event)</code>
 <div class="block">Default implementation of the
  <code>BundleTrackerCustomizer.addingBundle</code> method.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#close--">close</a></span>()</code>
 <div class="block">Close this <code>BundleTracker</code>.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>org.osgi.framework.Bundle[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#getBundles--">getBundles</a></span>()</code>
 <div class="block">Return an array of <code>Bundle</code>s for all bundles being tracked by
  this <code>BundleTracker</code>.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>java.lang.Object</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#getObject-org.osgi.framework.Bundle-">getObject</a></span>(org.osgi.framework.Bundle&nbsp;bundle)</code>
 <div class="block">Returns the customized object for the specified <code>Bundle</code> if
  the specified bundle is being tracked by this <code>BundleTracker</code>.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#getTrackingCount--">getTrackingCount</a></span>()</code>
 <div class="block">Returns the tracking count for this <code>BundleTracker</code>.</div>
 </td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#modifiedBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-java.lang.Object-">modifiedBundle</a></span>(org.osgi.framework.Bundle&nbsp;bundle,
               org.osgi.framework.BundleEvent&nbsp;event,
               java.lang.Object&nbsp;object)</code>
 <div class="block">Default implementation of the
  <code>BundleTrackerCustomizer.modifiedBundle</code> method.</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#open--">open</a></span>()</code>
 <div class="block">Open this <code>BundleTracker</code> and begin tracking bundles.</div>
 </td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#remove-org.osgi.framework.Bundle-">remove</a></span>(org.osgi.framework.Bundle&nbsp;bundle)</code>
 <div class="block">Remove a bundle from this <code>BundleTracker</code>.</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#removedBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-java.lang.Object-">removedBundle</a></span>(org.osgi.framework.Bundle&nbsp;bundle,
              org.osgi.framework.BundleEvent&nbsp;event,
              java.lang.Object&nbsp;object)</code>
 <div class="block">Default implementation of the
  <code>BundleTrackerCustomizer.removedBundle</code> method.</div>
 </td>
 </tr>
 <tr id="i10" class="altColor">
 <td class="colFirst"><code>int</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#size--">size</a></span>()</code>
 <div class="block">Return the number of bundles being tracked by this
  <code>BundleTracker</code>.</div>
 </td>
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 <h3>Methods inherited from class&nbsp;java.lang.Object</h3>
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 <pre>protected final&nbsp;org.osgi.framework.BundleContext context</pre>
 <div class="block">The Bundle Context used by this <code>BundleTracker</code>.</div>
 </li>
 </ul>
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 <h3>Constructor Detail</h3>
 <a name="BundleTracker-org.osgi.framework.BundleContext-int-org.apache.felix.dm.tracker.BundleTrackerCustomizer-">
 <!--   -->
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 <h4>BundleTracker</h4>
 <pre>public&nbsp;BundleTracker(org.osgi.framework.BundleContext&nbsp;context,
                      int&nbsp;stateMask,
                      <a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html" title="interface in org.apache.felix.dm.tracker">BundleTrackerCustomizer</a>&nbsp;customizer)</pre>
 <div class="block">Create a <code>BundleTracker</code> for bundles whose state is present in
  the specified state mask.

  <p>
  Bundles whose state is present on the specified state mask will be
  tracked by this <code>BundleTracker</code>.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>context</code> - The <code>BundleContext</code> against which the tracking
         is done.</dd>
 <dd><code>stateMask</code> - The bit mask of the <code>OR</code>ing of the bundle
         states to be tracked.</dd>
 <dd><code>customizer</code> - The customizer object to call when bundles are added,
         modified, or removed in this <code>BundleTracker</code>. If
         customizer is <code>null</code>, then this
         <code>BundleTracker</code> will be used as the
         <code>BundleTrackerCustomizer</code> and this
         <code>BundleTracker</code> will call the
         <code>BundleTrackerCustomizer</code> methods on itself.</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><code>Bundle.getState()</code></dd>
 </dl>
 </li>
 </ul>
 </li>
 </ul>
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 <h4>open</h4>
 <pre>public&nbsp;void&nbsp;open()</pre>
 <div class="block">Open this <code>BundleTracker</code> and begin tracking bundles.

  <p>
  Bundle which match the state criteria specified when this
  <code>BundleTracker</code> was created are now tracked by this
  <code>BundleTracker</code>.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code>java.lang.IllegalStateException</code> - If the <code>BundleContext</code>
          with which this <code>BundleTracker</code> was created is no
          longer valid.</dd>
 <dd><code>java.lang.SecurityException</code> - If the caller and this class do not
          have the appropriate
          <code>AdminPermission[context bundle,LISTENER]</code>, and the
          Java Runtime Environment supports permissions.</dd>
 </dl>
 </li>
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 <h4>close</h4>
 <pre>public&nbsp;void&nbsp;close()</pre>
 <div class="block">Close this <code>BundleTracker</code>.

  <p>
  This method should be called when this <code>BundleTracker</code> should
  end the tracking of bundles.

  <p>
  This implementation calls <a href="../../../../../org/apache/felix/dm/tracker/BundleTracker.html#getBundles--"><code>getBundles()</code></a> to get the list of
  tracked bundles to remove.</div>
 </li>
 </ul>
 <a name="addingBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-">
 <!--   -->
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 <h4>addingBundle</h4>
 <pre>public&nbsp;java.lang.Object&nbsp;addingBundle(org.osgi.framework.Bundle&nbsp;bundle,
                                      org.osgi.framework.BundleEvent&nbsp;event)</pre>
 <div class="block">Default implementation of the
  <code>BundleTrackerCustomizer.addingBundle</code> method.

  <p>
  This method is only called when this <code>BundleTracker</code> has been
  constructed with a <code>null BundleTrackerCustomizer</code> argument.

  <p>
  This implementation simply returns the specified <code>Bundle</code>.

  <p>
  This method can be overridden in a subclass to customize the object to be
  tracked for the bundle being added.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html#addingBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-">addingBundle</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html" title="interface in org.apache.felix.dm.tracker">BundleTrackerCustomizer</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>bundle</code> - The <code>Bundle</code> being added to this
         <code>BundleTracker</code> object.</dd>
 <dd><code>event</code> - The bundle event which caused this customizer method to be
         called or <code>null</code> if there is no bundle event associated
         with the call to this method.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>The specified bundle.</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html#addingBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-"><code>BundleTrackerCustomizer.addingBundle(Bundle, BundleEvent)</code></a></dd>
 </dl>
 </li>
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 <h4>addedBundle</h4>
 <pre>public&nbsp;void&nbsp;addedBundle(org.osgi.framework.Bundle&nbsp;bundle,
                         org.osgi.framework.BundleEvent&nbsp;event,
                         java.lang.Object&nbsp;object)</pre>
 <div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html#addedBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-java.lang.Object-">BundleTrackerCustomizer</a></code></span></div>
 <div class="block">marrs: A bundle has been added to the BundleTracker.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html#addedBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-java.lang.Object-">addedBundle</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html" title="interface in org.apache.felix.dm.tracker">BundleTrackerCustomizer</a></code></dd>
 </dl>
 </li>
 </ul>
 <a name="modifiedBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-java.lang.Object-">
 <!--   -->
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 <h4>modifiedBundle</h4>
 <pre>public&nbsp;void&nbsp;modifiedBundle(org.osgi.framework.Bundle&nbsp;bundle,
                            org.osgi.framework.BundleEvent&nbsp;event,
                            java.lang.Object&nbsp;object)</pre>
 <div class="block">Default implementation of the
  <code>BundleTrackerCustomizer.modifiedBundle</code> method.

  <p>
  This method is only called when this <code>BundleTracker</code> has been
  constructed with a <code>null BundleTrackerCustomizer</code> argument.

  <p>
  This implementation does nothing.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html#modifiedBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-java.lang.Object-">modifiedBundle</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html" title="interface in org.apache.felix.dm.tracker">BundleTrackerCustomizer</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>bundle</code> - The <code>Bundle</code> whose state has been modified.</dd>
 <dd><code>event</code> - The bundle event which caused this customizer method to be
         called or <code>null</code> if there is no bundle event associated
         with the call to this method.</dd>
 <dd><code>object</code> - The customized object for the specified Bundle.</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html#modifiedBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-java.lang.Object-"><code>BundleTrackerCustomizer.modifiedBundle(Bundle, BundleEvent, Object)</code></a></dd>
 </dl>
 </li>
 </ul>
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 <h4>removedBundle</h4>
 <pre>public&nbsp;void&nbsp;removedBundle(org.osgi.framework.Bundle&nbsp;bundle,
                           org.osgi.framework.BundleEvent&nbsp;event,
                           java.lang.Object&nbsp;object)</pre>
 <div class="block">Default implementation of the
  <code>BundleTrackerCustomizer.removedBundle</code> method.

  <p>
  This method is only called when this <code>BundleTracker</code> has been
  constructed with a <code>null BundleTrackerCustomizer</code> argument.

  <p>
  This implementation does nothing.</div>
 <dl>
 <dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
 <dd><code><a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html#removedBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-java.lang.Object-">removedBundle</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html" title="interface in org.apache.felix.dm.tracker">BundleTrackerCustomizer</a></code></dd>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>bundle</code> - The <code>Bundle</code> being removed.</dd>
 <dd><code>event</code> - The bundle event which caused this customizer method to be
         called or <code>null</code> if there is no bundle event associated
         with the call to this method.</dd>
 <dd><code>object</code> - The customized object for the specified bundle.</dd>
 <dt><span class="seeLabel">See Also:</span></dt>
 <dd><a href="../../../../../org/apache/felix/dm/tracker/BundleTrackerCustomizer.html#removedBundle-org.osgi.framework.Bundle-org.osgi.framework.BundleEvent-java.lang.Object-"><code>BundleTrackerCustomizer.removedBundle(Bundle, BundleEvent, Object)</code></a></dd>
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 <pre>public&nbsp;org.osgi.framework.Bundle[]&nbsp;getBundles()</pre>
 <div class="block">Return an array of <code>Bundle</code>s for all bundles being tracked by
  this <code>BundleTracker</code>.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>An array of <code>Bundle</code>s or <code>null</code> if no
          bundles are being tracked.</dd>
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 <pre>public&nbsp;java.lang.Object&nbsp;getObject(org.osgi.framework.Bundle&nbsp;bundle)</pre>
 <div class="block">Returns the customized object for the specified <code>Bundle</code> if
  the specified bundle is being tracked by this <code>BundleTracker</code>.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>bundle</code> - The <code>Bundle</code> being tracked.</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>The customized object for the specified <code>Bundle</code> or
          <code>null</code> if the specified <code>Bundle</code> is not
          being tracked.</dd>
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 <pre>public&nbsp;void&nbsp;remove(org.osgi.framework.Bundle&nbsp;bundle)</pre>
 <div class="block">Remove a bundle from this <code>BundleTracker</code>.

  The specified bundle will be removed from this <code>BundleTracker</code>
  . If the specified bundle was being tracked then the
  <code>BundleTrackerCustomizer.removedBundle</code> method will be called
  for that bundle.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>bundle</code> - The <code>Bundle</code> to be removed.</dd>
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 <pre>public&nbsp;int&nbsp;size()</pre>
 <div class="block">Return the number of bundles being tracked by this
  <code>BundleTracker</code>.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>The number of bundles being tracked.</dd>
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 <pre>public&nbsp;int&nbsp;getTrackingCount()</pre>
 <div class="block">Returns the tracking count for this <code>BundleTracker</code>.

  The tracking count is initialized to 0 when this
  <code>BundleTracker</code> is opened. Every time a bundle is added,
  modified or removed from this <code>BundleTracker</code> the tracking
  count is incremented.

  <p>
  The tracking count can be used to determine if this
  <code>BundleTracker</code> has added, modified or removed a bundle by
  comparing a tracking count value previously collected with the current
  tracking count value. If the value has not changed, then no bundle has
  been added, modified or removed from this <code>BundleTracker</code>
  since the previous tracking count was collected.</div>
 <dl>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>The tracking count for this <code>BundleTracker</code> or -1 if
          this <code>BundleTracker</code> is not open.</dd>
 </dl>
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