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SequencedHashMap (Jakarta Commons Collections Package)
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org.apache.commons.collections</FONT>
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Class SequencedHashMap</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.commons.collections.SequencedHashMap</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD>java.io.Externalizable, java.io.Serializable, java.lang.Cloneable, java.util.Map</DD>
</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../org/apache/commons/collections/LRUMap.html" title="class in org.apache.commons.collections">LRUMap</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <B>SequencedHashMap</B><DT>extends java.lang.Object<DT>implements java.util.Map, java.lang.Cloneable, java.io.Externalizable</DL>
</PRE>
<P>
A map of objects whose mapping entries are sequenced based on the order in
which they were added. This data structure has fast <I>O(1)</I> search
time, deletion time, and insertion time.
<P>Although this map is sequenced, it cannot implement <CODE>List</CODE> because of incompatible interface definitions. The remove
methods in List and Map have different return values (see: <CODE>List.remove(Object)</CODE> and <CODE>Map.remove(Object)</CODE>).
<P>This class is not thread safe. When a thread safe implementation is
required, use <CODE>Collections.synchronizedMap(Map)</CODE> as it is documented,
or use explicit synchronization controls.
<P>
<P>
<DL>
<DT><B>Since:</B></DT>
<DD>2.0</DD>
<DT><B>Author:</B></DT>
<DD><a href="mailto:mas@apache.org">Michael A. Smith</A>, <a href="mailto:dlr@collab.net">Daniel Rall</a>, <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a></DD>
<DT><B>See Also:</B><DD><A HREF="../../../../serialized-form.html#org.apache.commons.collections.SequencedHashMap">Serialized Form</A></DL>
<HR>
<P>
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<B>Constructor Summary</B></FONT></TH>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#SequencedHashMap()">SequencedHashMap</A></B>()</CODE>
<BR>
Construct a new sequenced hash map with default initial size and load
factor.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#SequencedHashMap(int)">SequencedHashMap</A></B>(int initialSize)</CODE>
<BR>
Construct a new sequenced hash map with the specified initial size and
default load factor.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#SequencedHashMap(int, float)">SequencedHashMap</A></B>(int initialSize,
float loadFactor)</CODE>
<BR>
Construct a new sequenced hash map with the specified initial size and
load factor.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#SequencedHashMap(java.util.Map)">SequencedHashMap</A></B>(java.util.Map m)</CODE>
<BR>
Construct a new sequenced hash map and add all the elements in the
specified map.</TD>
</TR>
</TABLE>
<!-- ========== METHOD SUMMARY =========== -->
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#clear()">clear</A></B>()</CODE>
<BR>
Implements <CODE>Map.clear()</CODE>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#clone()">clone</A></B>()</CODE>
<BR>
Creates a shallow copy of this object, preserving the internal structure
by copying only references.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#containsKey(java.lang.Object)">containsKey</A></B>(java.lang.Object key)</CODE>
<BR>
Implements <CODE>Map.containsKey(Object)</CODE>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#containsValue(java.lang.Object)">containsValue</A></B>(java.lang.Object value)</CODE>
<BR>
Implements <CODE>Map.containsValue(Object)</CODE>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.util.Set</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#entrySet()">entrySet</A></B>()</CODE>
<BR>
Implements <CODE>Map.entrySet()</CODE>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#equals(java.lang.Object)">equals</A></B>(java.lang.Object obj)</CODE>
<BR>
Implements <CODE>Map.equals(Object)</CODE>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#get(int)">get</A></B>(int index)</CODE>
<BR>
Returns the key at the specified index.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#get(java.lang.Object)">get</A></B>(java.lang.Object o)</CODE>
<BR>
Implements <CODE>Map.get(Object)</CODE>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.util.Map.Entry</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#getFirst()">getFirst</A></B>()</CODE>
<BR>
Return the entry for the "oldest" mapping.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#getFirstKey()">getFirstKey</A></B>()</CODE>
<BR>
Return the key for the "oldest" mapping.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#getFirstValue()">getFirstValue</A></B>()</CODE>
<BR>
Return the value for the "oldest" mapping.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.util.Map.Entry</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#getLast()">getLast</A></B>()</CODE>
<BR>
Return the entry for the "newest" mapping.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#getLastKey()">getLastKey</A></B>()</CODE>
<BR>
Return the key for the "newest" mapping.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#getLastValue()">getLastValue</A></B>()</CODE>
<BR>
Return the value for the "newest" mapping.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#getValue(int)">getValue</A></B>(int index)</CODE>
<BR>
Returns the value at the specified index.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#hashCode()">hashCode</A></B>()</CODE>
<BR>
Implements <CODE>Map.hashCode()</CODE>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#indexOf(java.lang.Object)">indexOf</A></B>(java.lang.Object key)</CODE>
<BR>
Returns the index of the specified key.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#isEmpty()">isEmpty</A></B>()</CODE>
<BR>
Implements <CODE>Map.isEmpty()</CODE>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.util.Iterator</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#iterator()">iterator</A></B>()</CODE>
<BR>
Returns a key iterator.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.util.Set</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#keySet()">keySet</A></B>()</CODE>
<BR>
Implements <CODE>Map.keySet()</CODE>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#lastIndexOf(java.lang.Object)">lastIndexOf</A></B>(java.lang.Object key)</CODE>
<BR>
Returns the last index of the specified key.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#put(java.lang.Object, java.lang.Object)">put</A></B>(java.lang.Object key,
java.lang.Object value)</CODE>
<BR>
Implements <CODE>Map.put(Object, Object)</CODE>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#putAll(java.util.Map)">putAll</A></B>(java.util.Map t)</CODE>
<BR>
Adds all the mappings in the specified map to this map, replacing any
mappings that already exist (as per <CODE>Map.putAll(Map)</CODE>).</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#readExternal(java.io.ObjectInput)">readExternal</A></B>(java.io.ObjectInput in)</CODE>
<BR>
Deserializes this map from the given stream.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#remove(int)">remove</A></B>(int index)</CODE>
<BR>
Removes the element at the specified index.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.Object</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#remove(java.lang.Object)">remove</A></B>(java.lang.Object key)</CODE>
<BR>
Implements <CODE>Map.remove(Object)</CODE>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.util.List</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#sequence()">sequence</A></B>()</CODE>
<BR>
Returns a List view of the keys rather than a set view.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#size()">size</A></B>()</CODE>
<BR>
Implements <CODE>Map.size()</CODE>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#toString()">toString</A></B>()</CODE>
<BR>
Provides a string representation of the entries within the map.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> java.util.Collection</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#values()">values</A></B>()</CODE>
<BR>
Implements <CODE>Map.values()</CODE>.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#writeExternal(java.io.ObjectOutput)">writeExternal</A></B>(java.io.ObjectOutput out)</CODE>
<BR>
Serializes this map to the given stream.</TD>
</TR>
</TABLE>
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<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>finalize, getClass, notify, notifyAll, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
<P>
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<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="SequencedHashMap()"><!-- --></A><H3>
SequencedHashMap</H3>
<PRE>
public <B>SequencedHashMap</B>()</PRE>
<DL>
<DD>Construct a new sequenced hash map with default initial size and load
factor.
<P>
</DL>
<HR>
<A NAME="SequencedHashMap(int)"><!-- --></A><H3>
SequencedHashMap</H3>
<PRE>
public <B>SequencedHashMap</B>(int initialSize)</PRE>
<DL>
<DD>Construct a new sequenced hash map with the specified initial size and
default load factor.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>initialSize</CODE> - the initial size for the hash table<DT><B>See Also:</B><DD><CODE>HashMap.HashMap(int)</CODE></DL>
</DL>
<HR>
<A NAME="SequencedHashMap(int, float)"><!-- --></A><H3>
SequencedHashMap</H3>
<PRE>
public <B>SequencedHashMap</B>(int initialSize,
float loadFactor)</PRE>
<DL>
<DD>Construct a new sequenced hash map with the specified initial size and
load factor.
<P>
<DL>
<DT><B>Parameters:</B><DD><CODE>initialSize</CODE> - the initial size for the hash table<DD><CODE>loadFactor</CODE> - the load factor for the hash table.<DT><B>See Also:</B><DD><CODE>HashMap.HashMap(int,float)</CODE></DL>
</DL>
<HR>
<A NAME="SequencedHashMap(java.util.Map)"><!-- --></A><H3>
SequencedHashMap</H3>
<PRE>
public <B>SequencedHashMap</B>(java.util.Map m)</PRE>
<DL>
<DD>Construct a new sequenced hash map and add all the elements in the
specified map. The order in which the mappings in the specified map are
added is defined by <A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#putAll(java.util.Map)"><CODE>putAll(Map)</CODE></A>.
<P>
</DL>
<!-- ============ METHOD DETAIL ========== -->
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<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>
<A NAME="clear()"><!-- --></A><H3>
clear</H3>
<PRE>
public void <B>clear</B>()</PRE>
<DL>
<DD>Implements <CODE>Map.clear()</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>clear</CODE> in interface <CODE>java.util.Map</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="clone()"><!-- --></A><H3>
clone</H3>
<PRE>
public java.lang.Object <B>clone</B>()
throws java.lang.CloneNotSupportedException</PRE>
<DL>
<DD>Creates a shallow copy of this object, preserving the internal structure
by copying only references. The keys and values themselves are not
<code>clone()</code>'d. The cloned object maintains the same sequence.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE>clone</CODE> in class <CODE>java.lang.Object</CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>A clone of this instance.
<DT><B>Throws:</B>
<DD><CODE>java.lang.CloneNotSupportedException</CODE> - if clone is not supported by a
subclass.</DL>
</DD>
</DL>
<HR>
<A NAME="containsKey(java.lang.Object)"><!-- --></A><H3>
containsKey</H3>
<PRE>
public boolean <B>containsKey</B>(java.lang.Object key)</PRE>
<DL>
<DD>Implements <CODE>Map.containsKey(Object)</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>containsKey</CODE> in interface <CODE>java.util.Map</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="containsValue(java.lang.Object)"><!-- --></A><H3>
containsValue</H3>
<PRE>
public boolean <B>containsValue</B>(java.lang.Object value)</PRE>
<DL>
<DD>Implements <CODE>Map.containsValue(Object)</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>containsValue</CODE> in interface <CODE>java.util.Map</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="entrySet()"><!-- --></A><H3>
entrySet</H3>
<PRE>
public java.util.Set <B>entrySet</B>()</PRE>
<DL>
<DD>Implements <CODE>Map.entrySet()</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>entrySet</CODE> in interface <CODE>java.util.Map</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</B>(java.lang.Object obj)</PRE>
<DL>
<DD>Implements <CODE>Map.equals(Object)</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>equals</CODE> in interface <CODE>java.util.Map</CODE><DT><B>Overrides:</B><DD><CODE>equals</CODE> in class <CODE>java.lang.Object</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="get(int)"><!-- --></A><H3>
get</H3>
<PRE>
public java.lang.Object <B>get</B>(int index)</PRE>
<DL>
<DD>Returns the key at the specified index.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.lang.ArrayIndexOutOfBoundsException</CODE> - if the <code>index</code> is
<code>< 0</code> or <code>></code> the size of the map.</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 o)</PRE>
<DL>
<DD>Implements <CODE>Map.get(Object)</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>get</CODE> in interface <CODE>java.util.Map</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getFirst()"><!-- --></A><H3>
getFirst</H3>
<PRE>
public java.util.Map.Entry <B>getFirst</B>()</PRE>
<DL>
<DD>Return the entry for the "oldest" mapping. That is, return the Map.Entry
for the key-value pair that was first put into the map when compared to
all the other pairings in the map. This behavior is equivalent to using
<code>entrySet().iterator().next()</code>, but this method provides an
optimized implementation.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>The first entry in the sequence, or <code>null</code> if the
map is empty.</DL>
</DD>
</DL>
<HR>
<A NAME="getFirstKey()"><!-- --></A><H3>
getFirstKey</H3>
<PRE>
public java.lang.Object <B>getFirstKey</B>()</PRE>
<DL>
<DD>Return the key for the "oldest" mapping. That is, return the key for the
mapping that was first put into the map when compared to all the other
objects in the map. This behavior is equivalent to using
<code>getFirst().getKey()</code>, but this method provides a slightly
optimized implementation.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>The first key in the sequence, or <code>null</code> if the
map is empty.</DL>
</DD>
</DL>
<HR>
<A NAME="getFirstValue()"><!-- --></A><H3>
getFirstValue</H3>
<PRE>
public java.lang.Object <B>getFirstValue</B>()</PRE>
<DL>
<DD>Return the value for the "oldest" mapping. That is, return the value for
the mapping that was first put into the map when compared to all the
other objects in the map. This behavior is equivalent to using
<code>getFirst().getValue()</code>, but this method provides a slightly
optimized implementation.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>The first value in the sequence, or <code>null</code> if the
map is empty.</DL>
</DD>
</DL>
<HR>
<A NAME="getLast()"><!-- --></A><H3>
getLast</H3>
<PRE>
public java.util.Map.Entry <B>getLast</B>()</PRE>
<DL>
<DD>Return the entry for the "newest" mapping. That is, return the Map.Entry
for the key-value pair that was first put into the map when compared to
all the other pairings in the map. The behavior is equivalent to:
<pre>
Object obj = null;
Iterator iter = entrySet().iterator();
while(iter.hasNext()) {
obj = iter.next();
}
return (Map.Entry)obj;
</pre>
However, the implementation of this method ensures an O(1) lookup of the
last key rather than O(n).
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>The last entry in the sequence, or <code>null</code> if the map
is empty.</DL>
</DD>
</DL>
<HR>
<A NAME="getLastKey()"><!-- --></A><H3>
getLastKey</H3>
<PRE>
public java.lang.Object <B>getLastKey</B>()</PRE>
<DL>
<DD>Return the key for the "newest" mapping. That is, return the key for the
mapping that was last put into the map when compared to all the other
objects in the map. This behavior is equivalent to using
<code>getLast().getKey()</code>, but this method provides a slightly
optimized implementation.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>The last key in the sequence, or <code>null</code> if the map is
empty.</DL>
</DD>
</DL>
<HR>
<A NAME="getLastValue()"><!-- --></A><H3>
getLastValue</H3>
<PRE>
public java.lang.Object <B>getLastValue</B>()</PRE>
<DL>
<DD>Return the value for the "newest" mapping. That is, return the value for
the mapping that was last put into the map when compared to all the other
objects in the map. This behavior is equivalent to using
<code>getLast().getValue()</code>, but this method provides a slightly
optimized implementation.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>The last value in the sequence, or <code>null</code> if the map
is empty.</DL>
</DD>
</DL>
<HR>
<A NAME="getValue(int)"><!-- --></A><H3>
getValue</H3>
<PRE>
public java.lang.Object <B>getValue</B>(int index)</PRE>
<DL>
<DD>Returns the value at the specified index.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.lang.ArrayIndexOutOfBoundsException</CODE> - if the <code>index</code> is
<code>< 0</code> or <code>></code> the size of the map.</DL>
</DD>
</DL>
<HR>
<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD>Implements <CODE>Map.hashCode()</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>hashCode</CODE> in interface <CODE>java.util.Map</CODE><DT><B>Overrides:</B><DD><CODE>hashCode</CODE> in class <CODE>java.lang.Object</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="indexOf(java.lang.Object)"><!-- --></A><H3>
indexOf</H3>
<PRE>
public int <B>indexOf</B>(java.lang.Object key)</PRE>
<DL>
<DD>Returns the index of the specified key.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="isEmpty()"><!-- --></A><H3>
isEmpty</H3>
<PRE>
public boolean <B>isEmpty</B>()</PRE>
<DL>
<DD>Implements <CODE>Map.isEmpty()</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>isEmpty</CODE> in interface <CODE>java.util.Map</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="iterator()"><!-- --></A><H3>
iterator</H3>
<PRE>
public java.util.Iterator <B>iterator</B>()</PRE>
<DL>
<DD>Returns a key iterator.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="keySet()"><!-- --></A><H3>
keySet</H3>
<PRE>
public java.util.Set <B>keySet</B>()</PRE>
<DL>
<DD>Implements <CODE>Map.keySet()</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>keySet</CODE> in interface <CODE>java.util.Map</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="lastIndexOf(java.lang.Object)"><!-- --></A><H3>
lastIndexOf</H3>
<PRE>
public int <B>lastIndexOf</B>(java.lang.Object key)</PRE>
<DL>
<DD>Returns the last index of the specified key.
<P>
<DD><DL>
</DL>
</DD>
<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 key,
java.lang.Object value)</PRE>
<DL>
<DD>Implements <CODE>Map.put(Object, Object)</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>put</CODE> in interface <CODE>java.util.Map</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="putAll(java.util.Map)"><!-- --></A><H3>
putAll</H3>
<PRE>
public void <B>putAll</B>(java.util.Map t)</PRE>
<DL>
<DD>Adds all the mappings in the specified map to this map, replacing any
mappings that already exist (as per <CODE>Map.putAll(Map)</CODE>). The order
in which the entries are added is determined by the iterator returned
from <CODE>Map.entrySet()</CODE> for the specified map.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>putAll</CODE> in interface <CODE>java.util.Map</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>t</CODE> - the mappings that should be added to this map.
<DT><B>Throws:</B>
<DD><CODE>java.lang.NullPointerException</CODE> - if <code>t</code> is <code>null</code></DL>
</DD>
</DL>
<HR>
<A NAME="readExternal(java.io.ObjectInput)"><!-- --></A><H3>
readExternal</H3>
<PRE>
public void <B>readExternal</B>(java.io.ObjectInput in)
throws java.io.IOException,
java.lang.ClassNotFoundException</PRE>
<DL>
<DD>Deserializes this map from the given stream.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>readExternal</CODE> in interface <CODE>java.io.Externalizable</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>in</CODE> - the stream to deserialize from
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if the stream raises it
<DD><CODE>java.lang.ClassNotFoundException</CODE> - if the stream raises it</DL>
</DD>
</DL>
<HR>
<A NAME="remove(int)"><!-- --></A><H3>
remove</H3>
<PRE>
public java.lang.Object <B>remove</B>(int index)</PRE>
<DL>
<DD>Removes the element at the specified index.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>index</CODE> - The index of the object to remove.
<DT><B>Returns:</B><DD>The previous value coressponding the <code>key</code>, or
<code>null</code> if none existed.
<DT><B>Throws:</B>
<DD><CODE>java.lang.ArrayIndexOutOfBoundsException</CODE> - if the <code>index</code> is
<code>< 0</code> or <code>></code> the size of the map.</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 key)</PRE>
<DL>
<DD>Implements <CODE>Map.remove(Object)</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>remove</CODE> in interface <CODE>java.util.Map</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="sequence()"><!-- --></A><H3>
sequence</H3>
<PRE>
public java.util.List <B>sequence</B>()</PRE>
<DL>
<DD>Returns a List view of the keys rather than a set view. The returned
list is unmodifiable. This is required because changes to the values of
the list (using <CODE>ListIterator.set(Object)</CODE>) will
effectively remove the value from the list and reinsert that value at
the end of the list, which is an unexpected side effect of changing the
value of a list. This occurs because changing the key, changes when the
mapping is added to the map and thus where it appears in the list.
<P>An alternative to this method is to use <A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#keySet()"><CODE>keySet()</CODE></A>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>The ordered list of keys.<DT><B>See Also:</B><DD><A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#keySet()"><CODE>keySet()</CODE></A></DL>
</DD>
</DL>
<HR>
<A NAME="size()"><!-- --></A><H3>
size</H3>
<PRE>
public int <B>size</B>()</PRE>
<DL>
<DD>Implements <CODE>Map.size()</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>size</CODE> in interface <CODE>java.util.Map</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public java.lang.String <B>toString</B>()</PRE>
<DL>
<DD>Provides a string representation of the entries within the map. The
format of the returned string may change with different releases, so this
method is suitable for debugging purposes only. If a specific format is
required, use <A HREF="../../../../org/apache/commons/collections/SequencedHashMap.html#entrySet()"><CODE>entrySet()</CODE></A>.<CODE>iterator()</CODE> and
iterate over the entries in the map formatting them as appropriate.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE>toString</CODE> in class <CODE>java.lang.Object</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="values()"><!-- --></A><H3>
values</H3>
<PRE>
public java.util.Collection <B>values</B>()</PRE>
<DL>
<DD>Implements <CODE>Map.values()</CODE>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>values</CODE> in interface <CODE>java.util.Map</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="writeExternal(java.io.ObjectOutput)"><!-- --></A><H3>
writeExternal</H3>
<PRE>
public void <B>writeExternal</B>(java.io.ObjectOutput out)
throws java.io.IOException</PRE>
<DL>
<DD>Serializes this map to the given stream.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>writeExternal</CODE> in interface <CODE>java.io.Externalizable</CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>out</CODE> - the stream to serialize to
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE> - if the stream raises it</DL>
</DD>
</DL>
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