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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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SimpleLRUCache (jTDS API)
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net.sourceforge.jtds.jdbc.cache</FONT>
<BR>
Class SimpleLRUCache</H2>
<PRE>
java.lang.Object
  <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by">java.util.AbstractMap
      <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by">java.util.HashMap
          <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by"><B>net.sourceforge.jtds.jdbc.cache.SimpleLRUCache</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD>java.lang.Cloneable, java.util.Map, java.io.Serializable</DD>
</DL>
<HR>
<DL>
<DT>public class <B>SimpleLRUCache</B><DT>extends java.util.HashMap</DL>

<P>
Simple LRU cache for any type of object. Implemented as an extended
 <code>HashMap</code> with a maximum size and an aggregated <code>List</code>
 as LRU queue.
<P>

<P>
<DL>
<DT><B>Version:</B></DT>
  <DD>$Id: SimpleLRUCache.java,v 1.1 2005/04/25 11:46:56 alin_sinpalean Exp $</DD>
<DT><B>Author:</B></DT>
  <DD>Brett Wooldridge</DD>
<DT><B>See Also:</B><DD><A HREF="../../../../../serialized-form.html#net.sourceforge.jtds.jdbc.cache.SimpleLRUCache">Serialized Form</A></DL>
<HR>

<P>
<!-- ======== NESTED CLASS SUMMARY ======== -->

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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private &nbsp;java.util.LinkedList</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sourceforge/jtds/jdbc/cache/SimpleLRUCache.html#list">list</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;LRU list.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private &nbsp;int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sourceforge/jtds/jdbc/cache/SimpleLRUCache.html#maxCacheSize">maxCacheSize</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Maximum cache size.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="fields_inherited_from_class_java.util.HashMap"><!-- --></A>
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->

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<TD><CODE><B><A HREF="../../../../../net/sourceforge/jtds/jdbc/cache/SimpleLRUCache.html#SimpleLRUCache(int)">SimpleLRUCache</A></B>(int&nbsp;maxCacheSize)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructs a new LRU cache instance.</TD>
</TR>
</TABLE>
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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sourceforge/jtds/jdbc/cache/SimpleLRUCache.html#clear()">clear</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Overrides clear() to also clear the LRU list.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>private &nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sourceforge/jtds/jdbc/cache/SimpleLRUCache.html#freshenKey(java.lang.Object)">freshenKey</A></B>(java.lang.Object&nbsp;key)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Moves the specified value to the top of the LRU list (the bottom of the
 list is where least recently used items live).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sourceforge/jtds/jdbc/cache/SimpleLRUCache.html#get(java.lang.Object)">get</A></B>(java.lang.Object&nbsp;key)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Overrides <code>get()</code> so that it also updates the LRU list.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sourceforge/jtds/jdbc/cache/SimpleLRUCache.html#put(java.lang.Object, java.lang.Object)">put</A></B>(java.lang.Object&nbsp;key,
    java.lang.Object&nbsp;value)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Overrides <code>put()</code> so that it also updates the LRU list.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../net/sourceforge/jtds/jdbc/cache/SimpleLRUCache.html#remove(java.lang.Object)">remove</A></B>(java.lang.Object&nbsp;key)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.util.HashMap"><!-- --></A>
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<TD><B>Methods inherited from class java.util.HashMap</B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, containsKey, containsValue, entrySet, isEmpty, keySet, putAll, size, values</CODE></TD>
</TR>
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&nbsp;<A NAME="methods_inherited_from_class_java.util.AbstractMap"><!-- --></A>
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<TD><B>Methods inherited from class java.util.AbstractMap</B></TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>equals, hashCode, toString</CODE></TD>
</TR>
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<TD><B>Methods inherited from class java.lang.Object</B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>finalize, getClass, notify, notifyAll, wait, wait, wait</CODE></TD>
</TR>
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<TD><B>Methods inherited from interface java.util.Map</B></TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>equals, hashCode</CODE></TD>
</TR>
</TABLE>
&nbsp;
<P>

<!-- ============ FIELD DETAIL =========== -->

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<B>Field Detail</B></FONT></TD>
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</TABLE>

<A NAME="maxCacheSize"><!-- --></A><H3>
maxCacheSize</H3>
<PRE>
private final int <B>maxCacheSize</B></PRE>
<DL>
<DD>Maximum cache size.
<P>
<DL>
</DL>
</DL>
<HR>

<A NAME="list"><!-- --></A><H3>
list</H3>
<PRE>
private final java.util.LinkedList <B>list</B></PRE>
<DL>
<DD>LRU list.
<P>
<DL>
</DL>
</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

<A NAME="constructor_detail"><!-- --></A>
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<B>Constructor Detail</B></FONT></TD>
</TR>
</TABLE>

<A NAME="SimpleLRUCache(int)"><!-- --></A><H3>
SimpleLRUCache</H3>
<PRE>
public <B>SimpleLRUCache</B>(int&nbsp;maxCacheSize)</PRE>
<DL>
<DD>Constructs a new LRU cache instance.
<P>
<DT><B>Parameters:</B><DD><CODE>maxCacheSize</CODE> - the maximum number of entries in this cache before
                     entries are aged off</DL>

<!-- ============ METHOD DETAIL ========== -->

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</TABLE>

<A NAME="clear()"><!-- --></A><H3>
clear</H3>
<PRE>
public void <B>clear</B>()</PRE>
<DL>
<DD>Overrides clear() to also clear the LRU list.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="put(java.lang.Object, java.lang.Object)"><!-- --></A><H3>
put</H3>
<PRE>
public java.lang.Object <B>put</B>(java.lang.Object&nbsp;key,
                            java.lang.Object&nbsp;value)</PRE>
<DL>
<DD>Overrides <code>put()</code> so that it also updates the LRU list.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - key with which the specified value is to be associated<DD><CODE>value</CODE> - value to be associated with the key
<DT><B>Returns:</B><DD>previous value associated with key or <code>null</code> if there
         was no mapping for key; a <code>null</code> return can also
         indicate that the cache previously associated <code>null</code>
         with the specified key<DT><B>See Also:</B><DD><CODE>Map.put(Object, Object)</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="get(java.lang.Object)"><!-- --></A><H3>
get</H3>
<PRE>
public java.lang.Object <B>get</B>(java.lang.Object&nbsp;key)</PRE>
<DL>
<DD>Overrides <code>get()</code> so that it also updates the LRU list.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - key with which the expected value is associated
<DT><B>Returns:</B><DD>the value to which the cache maps the specified key, or
         <code>null</code> if the map contains no mapping for this key</DL>
</DD>
</DL>
<HR>

<A NAME="remove(java.lang.Object)"><!-- --></A><H3>
remove</H3>
<PRE>
public java.lang.Object <B>remove</B>(java.lang.Object&nbsp;key)</PRE>
<DL>
<DD><DL>
<DT><B>See Also:</B><DD><CODE>Map.remove(Object)</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="freshenKey(java.lang.Object)"><!-- --></A><H3>
freshenKey</H3>
<PRE>
private void <B>freshenKey</B>(java.lang.Object&nbsp;key)</PRE>
<DL>
<DD>Moves the specified value to the top of the LRU list (the bottom of the
 list is where least recently used items live).
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - key of the value to move to the top of the list</DL>
</DD>
</DL>
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