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<div class="subTitle">org.codehaus.plexus.util</div>
<h2 title="Class CachedMap" class="title">Class CachedMap</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>org.codehaus.plexus.util.CachedMap</li>
</ul>
</li>
</ul>
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<dt>All Implemented Interfaces:</dt>
<dd>java.util.Map</dd>
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<pre>public final class <span class="typeNameLabel">CachedMap</span>
extends java.lang.Object
implements java.util.Map</pre>
<div class="block"><p> This class provides cache access to <code>Map</code> collections.</p>
<p> Instance of this class can be used as "proxy" for any collection
implementing the <code>java.util.Map</code> interface.</p>
<p> Typically, <a href="../../../../org/codehaus/plexus/util/CachedMap.html" title="class in org.codehaus.plexus.util"><code>CachedMap</code></a> are used to accelerate access to
large collections when the access to the collection is not evenly
distributed (associative cache). The performance gain is about
50% for the fastest hash map collections (e.g. <a href="../../../../org/codehaus/plexus/util/FastMap.html" title="class in org.codehaus.plexus.util"><code>FastMap</code></a>).
For slower collections such as <code>java.util.TreeMap</code>,
non-resizable <a href="../../../../org/codehaus/plexus/util/FastMap.html" title="class in org.codehaus.plexus.util"><code>FastMap</code></a> (real-time) or database access,
performance can be of several orders of magnitude.</p>
<p> <b>Note:</b> The keys used to access elements of a <a href="../../../../org/codehaus/plexus/util/CachedMap.html" title="class in org.codehaus.plexus.util"><code>CachedMap</code></a> do
not need to be immutable as they are not stored in the cache
(only keys specified by the <a href="../../../../org/codehaus/plexus/util/CachedMap.html#put-java.lang.Object-java.lang.Object-"><code>put(java.lang.Object, java.lang.Object)</code></a> method are).
In other words, access can be performed using mutable keys as long
as these keys can be compared for equality with the real map's keys
(e.g. same <code>hashCode</code> values).</p>
<p> This implementation is not synchronized. Multiple threads accessing
or modifying the collection must be synchronized externally.</p>
<p><i> This class is <b>public domain</b> (not copyrighted).</i></p></div>
<dl>
<dt><span class="simpleTagLabel">Version:</span></dt>
<dd>5.3, October 30, 2003</dd>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd><a href="mailto:jean-marie@dautelle.com">Jean-Marie Dautelle</a></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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<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><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#CachedMap--">CachedMap</a></span>()</code>
<div class="block">Creates a cached map backed by a <a href="../../../../org/codehaus/plexus/util/FastMap.html" title="class in org.codehaus.plexus.util"><code>FastMap</code></a>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#CachedMap-int-">CachedMap</a></span>(int cacheSize)</code>
<div class="block">Creates a cached map backed by a <a href="../../../../org/codehaus/plexus/util/FastMap.html" title="class in org.codehaus.plexus.util"><code>FastMap</code></a> and having the
specified cache size.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#CachedMap-int-java.util.Map-">CachedMap</a></span>(int cacheSize,
java.util.Map backingMap)</code>
<div class="block">Creates a cached map backed by the specified map and having the specified
cache size.</div>
</td>
</tr>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#clear--">clear</a></span>()</code>
<div class="block">Removes all mappings from this map (optional operation).</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#containsKey-java.lang.Object-">containsKey</a></span>(java.lang.Object key)</code>
<div class="block">Indicates if this map contains a mapping for the specified key.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#containsValue-java.lang.Object-">containsValue</a></span>(java.lang.Object value)</code>
<div class="block">Returns <code>true</code> if this map maps one or more keys to the
specified value.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>java.util.Set</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#entrySet--">entrySet</a></span>()</code>
<div class="block">Returns an <b>unmodifiable</b> view of the mappings contained in this
map.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#equals-java.lang.Object-">equals</a></span>(java.lang.Object o)</code>
<div class="block">Compares the specified object with this map for equality.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#flush--">flush</a></span>()</code>
<div class="block">Flushes the key/value pairs being cached.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#get-java.lang.Object-">get</a></span>(java.lang.Object key)</code>
<div class="block">Returns the value to which this map maps the specified key.</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>java.util.Map</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#getBackingMap--">getBackingMap</a></span>()</code>
<div class="block">Returns the backing map.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#getCacheSize--">getCacheSize</a></span>()</code>
<div class="block">Returns the actual cache size.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#hashCode--">hashCode</a></span>()</code>
<div class="block">Returns the hash code value for this map.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#isEmpty--">isEmpty</a></span>()</code>
<div class="block">Returns <code>true</code> if this map contains no key-value mappings.</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>java.util.Set</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#keySet--">keySet</a></span>()</code>
<div class="block">Returns an <b>unmodifiable</b> view of the keys contained in this
map.</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#put-java.lang.Object-java.lang.Object-">put</a></span>(java.lang.Object key,
java.lang.Object value)</code>
<div class="block">Associates the specified value with the specified key in this map.</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#putAll-java.util.Map-">putAll</a></span>(java.util.Map map)</code>
<div class="block">Copies all of the mappings from the specified map to this map
(optional operation).</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#remove-java.lang.Object-">remove</a></span>(java.lang.Object key)</code>
<div class="block">Removes the mapping for this key from this map if it is present.</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#size--">size</a></span>()</code>
<div class="block">Returns the number of key-value mappings in this map.</div>
</td>
</tr>
<tr id="i16" class="altColor">
<td class="colFirst"><code>java.util.Collection</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/codehaus/plexus/util/CachedMap.html#values--">values</a></span>()</code>
<div class="block">Returns an <b>unmodifiable</b> view of the values contained in this map.</div>
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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>
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<h3>Methods inherited from interface java.util.Map</h3>
<code>compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, remove, replace, replace, replaceAll</code></li>
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<h4>CachedMap</h4>
<pre>public CachedMap()</pre>
<div class="block">Creates a cached map backed by a <a href="../../../../org/codehaus/plexus/util/FastMap.html" title="class in org.codehaus.plexus.util"><code>FastMap</code></a>.
The default cache size and map capacity is set to <code>256</code>
entries.</div>
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<h4>CachedMap</h4>
<pre>public CachedMap(int cacheSize)</pre>
<div class="block">Creates a cached map backed by a <a href="../../../../org/codehaus/plexus/util/FastMap.html" title="class in org.codehaus.plexus.util"><code>FastMap</code></a> and having the
specified cache size.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>cacheSize</code> - the cache size, the actual cache size is the
first power of 2 greater or equal to <code>cacheSize</code>.
This is also the initial capacity of the backing map.</dd>
</dl>
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<h4>CachedMap</h4>
<pre>public CachedMap(int cacheSize,
java.util.Map backingMap)</pre>
<div class="block">Creates a cached map backed by the specified map and having the specified
cache size. In order to maitain cache veracity, it is critical
that <b>all</b> update to the backing map is accomplished through the
<a href="../../../../org/codehaus/plexus/util/CachedMap.html" title="class in org.codehaus.plexus.util"><code>CachedMap</code></a> instance; otherwise <a href="../../../../org/codehaus/plexus/util/CachedMap.html#flush--"><code>flush()</code></a> has to be called.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>cacheSize</code> - the cache size, the actual cache size is the
first power of 2 greater or equal to <code>cacheSize</code>.</dd>
<dd><code>backingMap</code> - the backing map to be "wrapped" in a cached map.</dd>
</dl>
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<pre>public int getCacheSize()</pre>
<div class="block">Returns the actual cache size.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the cache size (power of 2).</dd>
</dl>
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<pre>public java.util.Map getBackingMap()</pre>
<div class="block">Returns the backing map. If the backing map is modified directly,
this <a href="../../../../org/codehaus/plexus/util/CachedMap.html" title="class in org.codehaus.plexus.util"><code>CachedMap</code></a> has to be flushed.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the backing map.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/codehaus/plexus/util/CachedMap.html#flush--"><code>flush()</code></a></dd>
</dl>
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<h4>flush</h4>
<pre>public void flush()</pre>
<div class="block">Flushes the key/value pairs being cached. This method should be called
if the backing map is externally modified.</div>
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<h4>get</h4>
<pre>public java.lang.Object get(java.lang.Object key)</pre>
<div class="block">Returns the value to which this map maps the specified key.
First, the cache is being checked, then if the cache does not contains
the specified key, the backing map is accessed and the key/value
pair is stored in the cache.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>get</code> in interface <code>java.util.Map</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - the key whose associated value is to be returned.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the value to which this map maps the specified key, or
<code>null</code> if the map contains no mapping for this key.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.ClassCastException</code> - if the key is of an inappropriate type for
the backing map (optional).</dd>
<dd><code>java.lang.NullPointerException</code> - if the key is <code>null</code>.</dd>
</dl>
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</ul>
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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">Associates the specified value with the specified key in this map.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>put</code> in interface <code>java.util.Map</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - the key with which the specified value is to be associated.</dd>
<dd><code>value</code> - the value to be associated with the specified key.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the previous value associated with specified key, or
<code>null</code> if there was no mapping for the key.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.UnsupportedOperationException</code> - if the <code>put</code> operation
is not supported by the backing map.</dd>
<dd><code>java.lang.ClassCastException</code> - if the class of the specified key or value
prevents it from being stored in this map.</dd>
<dd><code>java.lang.IllegalArgumentException</code> - if some aspect of this key or value
prevents it from being stored in this map.</dd>
<dd><code>java.lang.NullPointerException</code> - if the key is <code>null</code>.</dd>
</dl>
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<h4>remove</h4>
<pre>public java.lang.Object remove(java.lang.Object key)</pre>
<div class="block">Removes the mapping for this key from this map if it is present.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>remove</code> in interface <code>java.util.Map</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - key whose mapping is to be removed from the map.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>previous value associated with specified key,
or <code>null</code> if there was no mapping for key.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.ClassCastException</code> - if the key is of an inappropriate type for
the backing map (optional).</dd>
<dd><code>java.lang.NullPointerException</code> - if the key is <code>null</code>.</dd>
<dd><code>java.lang.UnsupportedOperationException</code> - if the <code>remove</code> method
is not supported by the backing map.</dd>
</dl>
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<h4>containsKey</h4>
<pre>public boolean containsKey(java.lang.Object key)</pre>
<div class="block">Indicates if this map contains a mapping for the specified key.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>containsKey</code> in interface <code>java.util.Map</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>key</code> - the key whose presence in this map is to be tested.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if this map contains a mapping for the
specified key; <code>false</code> otherwise.</dd>
</dl>
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<h4>size</h4>
<pre>public int size()</pre>
<div class="block">Returns the number of key-value mappings in this map. If the
map contains more than <code>Integer.MAX_VALUE</code> elements,
returns <code>Integer.MAX_VALUE</code>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>size</code> in interface <code>java.util.Map</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the number of key-value mappings in this map.</dd>
</dl>
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<pre>public boolean isEmpty()</pre>
<div class="block">Returns <code>true</code> if this map contains no key-value mappings.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>isEmpty</code> in interface <code>java.util.Map</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if this map contains no key-value mappings.</dd>
</dl>
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<h4>containsValue</h4>
<pre>public boolean containsValue(java.lang.Object value)</pre>
<div class="block">Returns <code>true</code> if this map maps one or more keys to the
specified value.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>containsValue</code> in interface <code>java.util.Map</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>value</code> - value whose presence in this map is to be tested.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if this map maps one or more keys to the
specified value.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.ClassCastException</code> - if the value is of an inappropriate type for
the backing map (optional).</dd>
<dd><code>java.lang.NullPointerException</code> - if the value is <code>null</code> and the
backing map does not not permit <code>null</code> values.</dd>
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<h4>putAll</h4>
<pre>public void putAll(java.util.Map map)</pre>
<div class="block">Copies all of the mappings from the specified map to this map
(optional operation). This method automatically flushes the cache.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>putAll</code> in interface <code>java.util.Map</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>map</code> - the mappings to be stored in this map.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.UnsupportedOperationException</code> - if the <code>putAll</code> method
is not supported by the backing map.</dd>
<dd><code>java.lang.ClassCastException</code> - if the class of a key or value in the
specified map prevents it from being stored in this map.</dd>
<dd><code>java.lang.IllegalArgumentException</code> - some aspect of a key or value in the
specified map prevents it from being stored in this map.</dd>
<dd><code>java.lang.NullPointerException</code> - the specified map is <code>null</code>, or
if the backing map does not permit <code>null</code> keys or
values, and the specified map contains <code>null</code> keys or
values.</dd>
</dl>
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<h4>clear</h4>
<pre>public void clear()</pre>
<div class="block">Removes all mappings from this map (optional operation). This method
automatically flushes the cache.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>clear</code> in interface <code>java.util.Map</code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.UnsupportedOperationException</code> - if clear is not supported by the
backing map.</dd>
</dl>
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<h4>keySet</h4>
<pre>public java.util.Set keySet()</pre>
<div class="block">Returns an <b>unmodifiable</b> view of the keys contained in this
map.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>keySet</code> in interface <code>java.util.Map</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an unmodifiable view of the keys contained in this map.</dd>
</dl>
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<pre>public java.util.Collection values()</pre>
<div class="block">Returns an <b>unmodifiable</b> view of the values contained in this map.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>values</code> in interface <code>java.util.Map</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an unmodifiable view of the values contained in this map.</dd>
</dl>
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<pre>public java.util.Set entrySet()</pre>
<div class="block">Returns an <b>unmodifiable</b> view of the mappings contained in this
map. Each element in the returned set is a <code>Map.Entry</code>.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>entrySet</code> in interface <code>java.util.Map</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an unmodifiable view of the mappings contained in this map.</dd>
</dl>
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<h4>equals</h4>
<pre>public boolean equals(java.lang.Object o)</pre>
<div class="block">Compares the specified object with this map for equality. Returns
<tt>true</tt> if the given object is also a map and the two Maps
represent the same mappings.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>equals</code> in interface <code>java.util.Map</code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>equals</code> in class <code>java.lang.Object</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>o</code> - object to be compared for equality with this map.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd><code>true</code> if the specified object is equal to this map.</dd>
</dl>
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<h4>hashCode</h4>
<pre>public int hashCode()</pre>
<div class="block">Returns the hash code value for this map.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code>hashCode</code> in interface <code>java.util.Map</code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code>hashCode</code> in class <code>java.lang.Object</code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the hash code value for this map.</dd>
</dl>
</li>
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