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<div class="subTitle">org.apache.commons.collections</div>
<h2 title="Class StaticBucketMap" class="title">Class StaticBucketMap</h2>
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<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>org.apache.commons.collections.StaticBucketMap</li>
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<dt>All Implemented Interfaces:</dt>
<dd>java.util.Map</dd>
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<pre>public final class <span class="strong">StaticBucketMap</span>
extends java.lang.Object
implements java.util.Map</pre>
<div class="block">A StaticBucketMap is an efficient, thread-safe implementation of
<code>java.util.Map</code> that performs well in in a highly
thread-contentious environment. The map supports very efficient
<a href="../../../../org/apache/commons/collections/StaticBucketMap.html#get(java.lang.Object)"><code>get</code></a>, <a href="../../../../org/apache/commons/collections/StaticBucketMap.html#put(java.lang.Object, java.lang.Object)"><code>put</code></a>,
<a href="../../../../org/apache/commons/collections/StaticBucketMap.html#remove(java.lang.Object)"><code>remove</code></a> and <a href="../../../../org/apache/commons/collections/StaticBucketMap.html#containsKey(java.lang.Object)"><code>containsKey</code></a>
operations, assuming (approximate) uniform hashing and
that the number of entries does not exceed the number of buckets. If the
number of entries exceeds the number of buckets or if the hashcodes of the
objects are not uniformly distributed, these operations have a worst case
scenario that is proportional to the number of elements in the map
(<I>O(n)</I>).<P>
Each bucket in the hash table has its own monitor, so two threads can
safely operate on the map at the same time, often without incurring any
monitor contention. This means that you don't have to wrap instances
of this class with <code>Collections.synchronizedMap(Map)</code>;
instances are already thread-safe. Unfortunately, however, this means
that this map implementation behaves in ways you may find disconcerting.
Bulk operations, such as <a href="../../../../org/apache/commons/collections/StaticBucketMap.html#putAll(java.util.Map)"><code>putAll</code></a> or the
<code>retainAll</code> operation in collection
views, are <I>not</I> atomic. If two threads are simultaneously
executing
<Pre>
staticBucketMapInstance.putAll(map);
</Pre>
and
<Pre>
staticBucketMapInstance.entrySet().removeAll(map.entrySet());
</Pre>
then the results are generally random. Those two statement could cancel
each other out, leaving <Code>staticBucketMapInstance</Code> essentially
unchanged, or they could leave some random subset of <Code>map</Code> in
<Code>staticBucketMapInstance</Code>.<P>
Also, much like an encyclopedia, the results of <a href="../../../../org/apache/commons/collections/StaticBucketMap.html#size()"><code>size()</code></a> and
<a href="../../../../org/apache/commons/collections/StaticBucketMap.html#isEmpty()"><code>isEmpty()</code></a> are out-of-date as soon as they are produced.<P>
The iterators returned by the collection views of this class are <I>not</I>
fail-fast. They will <I>never</I> raise a
<code>ConcurrentModificationException</code>. Keys and values
added to the map after the iterator is created do not necessarily appear
during iteration. Similarly, the iterator does not necessarily fail to
return keys and values that were removed after the iterator was created.<P>
Finally, unlike <code>HashMap</code>-style implementations, this
class <I>never</I> rehashes the map. The number of buckets is fixed
at construction time and never altered. Performance may degrade if
you do not allocate enough buckets upfront.<P>
The <a href="../../../../org/apache/commons/collections/StaticBucketMap.html#atomic(java.lang.Runnable)"><code>atomic(Runnable)</code></a> method is provided to allow atomic iterations
and bulk operations; however, overuse of <a href="../../../../org/apache/commons/collections/StaticBucketMap.html#atomic(java.lang.Runnable)"><code>atomic</code></a>
will basically result in a map that's slower than an ordinary synchronized
<code>HashMap</code>.
Use this class if you do not require reliable bulk operations and
iterations, or if you can make your own guarantees about how bulk
operations will affect the map.<P></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>Collections 2.1</dd>
<dt><span class="strong">Version:</span></dt>
<dd>CVS $Revision: 1.6.2.1 $ $Date: 2004/05/22 12:14:02 $</dd>
<dt><span class="strong">Author:</span></dt>
<dd><a href="mailto:bloritsch@apache.org">Berin Loritsch</a>, <a href="mailto:g-froehlich@gmx.de">Gerhard Froehlich</a>, <a href="mailto:mas@apache.org">Michael A. Smith</a>, Paul Jack</dd></dl>
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<h3>Nested classes/interfaces inherited from interface java.util.Map</h3>
<code>java.util.Map.Entry<K,V></code></li>
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<h3>Constructor Summary</h3>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#StaticBucketMap()">StaticBucketMap</a></strong>()</code>
<div class="block">Initializes the map with the default number of buckets (255).</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#StaticBucketMap(int)">StaticBucketMap</a></strong>(int numBuckets)</code>
<div class="block">Initializes the map with a specified number of buckets.</div>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<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/commons/collections/StaticBucketMap.html#atomic(java.lang.Runnable)">atomic</a></strong>(java.lang.Runnable r)</code>
<div class="block">Prevents any operations from occuring on this map while the
given <code>Runnable</code> executes.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#clear()">clear</a></strong>()</code>
<div class="block">Implements <code>Map.clear()</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#containsKey(java.lang.Object)">containsKey</a></strong>(java.lang.Object key)</code>
<div class="block">Implements <code>Map.containsKey(Object)</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#containsValue(java.lang.Object)">containsValue</a></strong>(java.lang.Object value)</code>
<div class="block">Implements <code>Map.containsValue(Object)</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.util.Set</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#entrySet()">entrySet</a></strong>()</code>
<div class="block">Implements <code>Map.entrySet()</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#equals(java.lang.Object)">equals</a></strong>(java.lang.Object obj)</code>
<div class="block">Implements <code>Map.equals(Object)</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#get(java.lang.Object)">get</a></strong>(java.lang.Object key)</code>
<div class="block">Implements <code>Map.get(Object)</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#hashCode()">hashCode</a></strong>()</code>
<div class="block">Implements <code>Map.hashCode()</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#isEmpty()">isEmpty</a></strong>()</code>
<div class="block">Implements <code>Map.isEmpty()</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.util.Set</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#keySet()">keySet</a></strong>()</code>
<div class="block">Implements <code>Map.keySet()</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#put(java.lang.Object, java.lang.Object)">put</a></strong>(java.lang.Object key,
java.lang.Object value)</code>
<div class="block">Implements <code>Map.put(Object, Object)</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#putAll(java.util.Map)">putAll</a></strong>(java.util.Map other)</code>
<div class="block">Implements <code>Map.putAll(Map)</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#remove(java.lang.Object)">remove</a></strong>(java.lang.Object key)</code>
<div class="block">Implements <code>Map.remove(Object)</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#size()">size</a></strong>()</code>
<div class="block">Implements <code>Map.size()</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.util.Collection</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/StaticBucketMap.html#values()">values</a></strong>()</code>
<div class="block">Implements <code>Map.values()</code>.</div>
</td>
</tr>
</table>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait</code></li>
</ul>
</li>
</ul>
</li>
</ul>
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<h3>Constructor Detail</h3>
<a name="StaticBucketMap()">
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<h4>StaticBucketMap</h4>
<pre>public StaticBucketMap()</pre>
<div class="block">Initializes the map with the default number of buckets (255).</div>
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<a name="StaticBucketMap(int)">
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<h4>StaticBucketMap</h4>
<pre>public StaticBucketMap(int numBuckets)</pre>
<div class="block">Initializes the map with a specified number of buckets. The number
of buckets is never below 17, and is always an odd number (StaticBucketMap
ensures this). The number of buckets is inversely proportional to the
chances for thread contention. The fewer buckets, the more chances for
thread contention. The more buckets the fewer chances for thread
contention.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>numBuckets</code> - the number of buckets for this map</dd></dl>
</li>
</ul>
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<h4>atomic</h4>
<pre>public void atomic(java.lang.Runnable r)</pre>
<div class="block">Prevents any operations from occuring on this map while the
given <code>Runnable</code> executes. This method can be used, for
instance, to execute a bulk operation atomicly:
<Pre>
staticBucketMapInstance.atomic(new Runnable() {
public void run() {
staticBucketMapInstance.putAll(map);
}
});
</Pre>
It can also be used if you need a reliable iterator:
<Pre>
staticBucketMapInstance.atomic(new Runnable() {
public void run() {
Iterator iterator = staticBucketMapInstance.iterator();
while (iterator.hasNext()) {
foo(iterator.next();
}
}
});
</Pre>
<B>Implementation note:</B> This method requires a lot of time
and a ton of stack space. Essentially a recursive algorithm is used
to enter each bucket's monitor. If you have twenty thousand buckets
in your map, then the recursive method will be invoked twenty thousand
times. You have been warned.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>r</code> - the code to execute atomicly</dd></dl>
</li>
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<a name="clear()">
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<h4>clear</h4>
<pre>public final void clear()</pre>
<div class="block">Implements <code>Map.clear()</code>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>clear</code> in interface <code>java.util.Map</code></dd>
</dl>
</li>
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<h4>containsKey</h4>
<pre>public boolean containsKey(java.lang.Object key)</pre>
<div class="block">Implements <code>Map.containsKey(Object)</code>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>containsKey</code> in interface <code>java.util.Map</code></dd>
</dl>
</li>
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<h4>containsValue</h4>
<pre>public boolean containsValue(java.lang.Object value)</pre>
<div class="block">Implements <code>Map.containsValue(Object)</code>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>containsValue</code> in interface <code>java.util.Map</code></dd>
</dl>
</li>
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<a name="entrySet()">
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<h4>entrySet</h4>
<pre>public java.util.Set entrySet()</pre>
<div class="block">Implements <code>Map.entrySet()</code>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>entrySet</code> in interface <code>java.util.Map</code></dd>
</dl>
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<h4>equals</h4>
<pre>public final boolean equals(java.lang.Object obj)</pre>
<div class="block">Implements <code>Map.equals(Object)</code>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>equals</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>equals</code> in class <code>java.lang.Object</code></dd>
</dl>
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<a name="get(java.lang.Object)">
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<h4>get</h4>
<pre>public java.lang.Object get(java.lang.Object key)</pre>
<div class="block">Implements <code>Map.get(Object)</code>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>get</code> in interface <code>java.util.Map</code></dd>
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<h4>hashCode</h4>
<pre>public final int hashCode()</pre>
<div class="block">Implements <code>Map.hashCode()</code>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>hashCode</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>hashCode</code> in class <code>java.lang.Object</code></dd>
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<h4>isEmpty</h4>
<pre>public final boolean isEmpty()</pre>
<div class="block">Implements <code>Map.isEmpty()</code>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>isEmpty</code> in interface <code>java.util.Map</code></dd>
</dl>
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<h4>keySet</h4>
<pre>public java.util.Set keySet()</pre>
<div class="block">Implements <code>Map.keySet()</code>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>keySet</code> in interface <code>java.util.Map</code></dd>
</dl>
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<a name="put(java.lang.Object, java.lang.Object)">
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<h4>put</h4>
<pre>public java.lang.Object put(java.lang.Object key,
java.lang.Object value)</pre>
<div class="block">Implements <code>Map.put(Object, Object)</code>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>put</code> in interface <code>java.util.Map</code></dd>
</dl>
</li>
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<h4>putAll</h4>
<pre>public void putAll(java.util.Map other)</pre>
<div class="block">Implements <code>Map.putAll(Map)</code>.</div>
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<dd><code>putAll</code> in interface <code>java.util.Map</code></dd>
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<pre>public java.lang.Object remove(java.lang.Object key)</pre>
<div class="block">Implements <code>Map.remove(Object)</code>.</div>
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<pre>public int size()</pre>
<div class="block">Implements <code>Map.size()</code>.</div>
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<h4>values</h4>
<pre>public java.util.Collection values()</pre>
<div class="block">Implements <code>Map.values()</code>.</div>
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<dd><code>values</code> in interface <code>java.util.Map</code></dd>
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