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<div class="subTitle">org.apache.commons.collections</div>
<h2 title="Class FastHashMap" class="title">Class FastHashMap</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>java.util.AbstractMap<K,V></li>
<li>
<ul class="inheritance">
<li>java.util.HashMap</li>
<li>
<ul class="inheritance">
<li>org.apache.commons.collections.FastHashMap</li>
</ul>
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<dd>java.io.Serializable, java.lang.Cloneable, java.util.Map</dd>
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<br>
<pre>public class <span class="strong">FastHashMap</span>
extends java.util.HashMap</pre>
<div class="block"><p>A customized implementation of <code>java.util.HashMap</code> designed
to operate in a multithreaded environment where the large majority of
method calls are read-only, instead of structural changes. When operating
in "fast" mode, read calls are non-synchronized and write calls perform the
following steps:</p>
<ul>
<li>Clone the existing collection
<li>Perform the modification on the clone
<li>Replace the existing collection with the (modified) clone
</ul>
<p>When first created, objects of this class default to "slow" mode, where
all accesses of any type are synchronized but no cloning takes place. This
is appropriate for initially populating the collection, followed by a switch
to "fast" mode (by calling <code>setFast(true)</code>) after initialization
is complete.</p>
<p><strong>NOTE</strong>: If you are creating and accessing a
<code>HashMap</code> only within a single thread, you should use
<code>java.util.HashMap</code> directly (with no synchronization), for
maximum performance.</p>
<P><strong>NOTE</strong>: <I>This class is not cross-platform.
Using it may cause unexpected failures on some architectures.</I>
It suffers from the same problems as the double-checked locking idiom.
In particular, the instruction that clones the internal collection and the
instruction that sets the internal reference to the clone can be executed
or perceived out-of-order. This means that any read operation might fail
unexpectedly, as it may be reading the state of the internal collection
before the internal collection is fully formed.
For more information on the double-checked locking idiom, see the
<A Href="http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html">
Double-Checked Locking Idiom Is Broken Declartion</A>.</P></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.0</dd>
<dt><span class="strong">Version:</span></dt>
<dd>$Revision: 1.10.2.1 $ $Date: 2004/05/22 12:14:01 $</dd>
<dt><span class="strong">Author:</span></dt>
<dd>Craig R. McClanahan</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="../../../../serialized-form.html#org.apache.commons.collections.FastHashMap">Serialized Form</a></dd></dl>
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<h3>Nested classes/interfaces inherited from class java.util.AbstractMap</h3>
<code>java.util.AbstractMap.SimpleEntry<K,V>, java.util.AbstractMap.SimpleImmutableEntry<K,V></code></li>
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<caption><span>Fields</span><span class="tabEnd"> </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 boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#fast">fast</a></strong></code>
<div class="block">Are we operating in "fast" mode?</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected java.util.HashMap</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#map">map</a></strong></code>
<div class="block">The underlying map we are managing.</div>
</td>
</tr>
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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/FastHashMap.html#FastHashMap()">FastHashMap</a></strong>()</code>
<div class="block">Construct a an empty map.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#FastHashMap(int)">FastHashMap</a></strong>(int capacity)</code>
<div class="block">Construct an empty map with the specified capacity.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#FastHashMap(int, float)">FastHashMap</a></strong>(int capacity,
float factor)</code>
<div class="block">Construct an empty map with the specified capacity and load factor.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#FastHashMap(java.util.Map)">FastHashMap</a></strong>(java.util.Map map)</code>
<div class="block">Construct a new map with the same mappings as the specified map.</div>
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</tr>
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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/FastHashMap.html#clear()">clear</a></strong>()</code>
<div class="block">Remove all mappings from this map.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#clone()">clone</a></strong>()</code>
<div class="block">Return a shallow copy of this <code>FastHashMap</code> instance.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#containsKey(java.lang.Object)">containsKey</a></strong>(java.lang.Object key)</code>
<div class="block">Return <code>true</code> if this map contains a mapping for the
specified key.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#containsValue(java.lang.Object)">containsValue</a></strong>(java.lang.Object value)</code>
<div class="block">Return <code>true</code> if this map contains one or more keys mapping
to the specified value.</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/FastHashMap.html#entrySet()">entrySet</a></strong>()</code>
<div class="block">Return a collection view of the mappings contained in this map.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#equals(java.lang.Object)">equals</a></strong>(java.lang.Object o)</code>
<div class="block">Compare the specified object with this list for equality.</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/FastHashMap.html#get(java.lang.Object)">get</a></strong>(java.lang.Object key)</code>
<div class="block">Return the value to which this map maps the specified key.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#getFast()">getFast</a></strong>()</code>
<div class="block">Returns true if this map is operating in fast mode.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#hashCode()">hashCode</a></strong>()</code>
<div class="block">Return the hash code value for this map.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#isEmpty()">isEmpty</a></strong>()</code>
<div class="block">Return <code>true</code> if this map contains no mappings.</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/FastHashMap.html#keySet()">keySet</a></strong>()</code>
<div class="block">Return a set view of the keys contained in this map.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#put(java.lang.Object, java.lang.Object)">put</a></strong>(java.lang.Object key,
java.lang.Object value)</code>
<div class="block">Associate the specified value with the specified key in this map.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#putAll(java.util.Map)">putAll</a></strong>(java.util.Map in)</code>
<div class="block">Copy all of the mappings from the specified map to this one, replacing
any mappings with the same keys.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#remove(java.lang.Object)">remove</a></strong>(java.lang.Object key)</code>
<div class="block">Remove any mapping for this key, and return any previously
mapped value.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#setFast(boolean)">setFast</a></strong>(boolean fast)</code>
<div class="block">Sets whether this map is operating in fast mode.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/commons/collections/FastHashMap.html#size()">size</a></strong>()</code>
<div class="block">Return the number of key-value mappings in this map.</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/FastHashMap.html#values()">values</a></strong>()</code>
<div class="block">Return a collection view of the values contained in this map.</div>
</td>
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<h3>Methods inherited from class java.util.AbstractMap</h3>
<code>toString</code></li>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>finalize, getClass, notify, notifyAll, wait, wait, wait</code></li>
</ul>
</li>
</ul>
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<h4>fast</h4>
<pre>protected boolean fast</pre>
<div class="block">Are we operating in "fast" mode?</div>
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<h4>map</h4>
<pre>protected java.util.HashMap map</pre>
<div class="block">The underlying map we are managing.</div>
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<h4>FastHashMap</h4>
<pre>public FastHashMap()</pre>
<div class="block">Construct a an empty map.</div>
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<h4>FastHashMap</h4>
<pre>public FastHashMap(int capacity)</pre>
<div class="block">Construct an empty map with the specified capacity.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>capacity</code> - The initial capacity of the empty map</dd></dl>
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<h4>FastHashMap</h4>
<pre>public FastHashMap(int capacity,
float factor)</pre>
<div class="block">Construct an empty map with the specified capacity and load factor.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>capacity</code> - The initial capacity of the empty map</dd><dd><code>factor</code> - The load factor of the new map</dd></dl>
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<h4>FastHashMap</h4>
<pre>public FastHashMap(java.util.Map map)</pre>
<div class="block">Construct a new map with the same mappings as the specified map.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>map</code> - The map whose mappings are to be copied</dd></dl>
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<h4>clear</h4>
<pre>public void clear()</pre>
<div class="block">Remove all mappings from this map.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>clear</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>clear</code> in class <code>java.util.HashMap</code></dd>
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<pre>public java.lang.Object clone()</pre>
<div class="block">Return a shallow copy of this <code>FastHashMap</code> instance.
The keys and values themselves are not copied.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code>clone</code> in class <code>java.util.HashMap</code></dd>
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<pre>public boolean containsKey(java.lang.Object key)</pre>
<div class="block">Return <code>true</code> if this map contains a mapping for the
specified key.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>containsKey</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>containsKey</code> in class <code>java.util.HashMap</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - Key to be searched for</dd></dl>
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<pre>public boolean containsValue(java.lang.Object value)</pre>
<div class="block">Return <code>true</code> if this map contains one or more keys mapping
to the specified value.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>containsValue</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>containsValue</code> in class <code>java.util.HashMap</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>value</code> - Value to be searched for</dd></dl>
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<h4>entrySet</h4>
<pre>public java.util.Set entrySet()</pre>
<div class="block">Return a collection view of the mappings contained in this map. Each
element in the returned collection is a <code>Map.Entry</code>.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>entrySet</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>entrySet</code> in class <code>java.util.HashMap</code></dd>
</dl>
</li>
</ul>
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<h4>equals</h4>
<pre>public boolean equals(java.lang.Object o)</pre>
<div class="block">Compare the specified object with this list for equality. This
implementation uses exactly the code that is used to define the
list equals function in the documentation for the
<code>Map.equals</code> method.</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.util.AbstractMap</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>o</code> - Object to be compared to this list</dd></dl>
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</ul>
<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">Return the value to which this map maps the specified key. Returns
<code>null</code> if the map contains no mapping for this key, or if
there is a mapping with a value of <code>null</code>. Use the
<code>containsKey()</code> method to disambiguate these cases.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>get</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>get</code> in class <code>java.util.HashMap</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - Key whose value is to be returned</dd></dl>
</li>
</ul>
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<h4>getFast</h4>
<pre>public boolean getFast()</pre>
<div class="block">Returns true if this map is operating in fast mode.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>true if this map is operating in fast mode</dd></dl>
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</ul>
<a name="hashCode()">
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<h4>hashCode</h4>
<pre>public int hashCode()</pre>
<div class="block">Return the hash code value for this map. This implementation uses
exactly the code that is used to define the list hash function in the
documentation for the <code>Map.hashCode</code> method.</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.util.AbstractMap</code></dd>
</dl>
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</ul>
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<h4>isEmpty</h4>
<pre>public boolean isEmpty()</pre>
<div class="block">Return <code>true</code> if this map contains no mappings.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>isEmpty</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>isEmpty</code> in class <code>java.util.HashMap</code></dd>
</dl>
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<a name="keySet()">
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<h4>keySet</h4>
<pre>public java.util.Set keySet()</pre>
<div class="block">Return a set view of the keys contained in this map.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>keySet</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>keySet</code> in class <code>java.util.HashMap</code></dd>
</dl>
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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">Associate the specified value with the specified key in this map.
If the map previously contained a mapping for this key, the old
value is replaced and returned.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>put</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>put</code> in class <code>java.util.HashMap</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - The key with which the value is to be associated</dd><dd><code>value</code> - The value to be associated with this key</dd></dl>
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<h4>putAll</h4>
<pre>public void putAll(java.util.Map in)</pre>
<div class="block">Copy all of the mappings from the specified map to this one, replacing
any mappings with the same keys.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>putAll</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>putAll</code> in class <code>java.util.HashMap</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>in</code> - Map whose mappings are to be copied</dd></dl>
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<h4>remove</h4>
<pre>public java.lang.Object remove(java.lang.Object key)</pre>
<div class="block">Remove any mapping for this key, and return any previously
mapped value.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>remove</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>remove</code> in class <code>java.util.HashMap</code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>key</code> - Key whose mapping is to be removed</dd></dl>
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<h4>setFast</h4>
<pre>public void setFast(boolean fast)</pre>
<div class="block">Sets whether this map is operating in fast mode.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>fast</code> - true if this map should operate in fast mode</dd></dl>
</li>
</ul>
<a name="size()">
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<h4>size</h4>
<pre>public int size()</pre>
<div class="block">Return the number of key-value mappings in this map.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>size</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>size</code> in class <code>java.util.HashMap</code></dd>
</dl>
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</ul>
<a name="values()">
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<h4>values</h4>
<pre>public java.util.Collection values()</pre>
<div class="block">Return a collection view of the values contained in this map.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code>values</code> in interface <code>java.util.Map</code></dd>
<dt><strong>Overrides:</strong></dt>
<dd><code>values</code> in class <code>java.util.HashMap</code></dd>
</dl>
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