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StoredKeySet (Sleepycat Software, Inc. - Berkeley DB Java API)
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<b>Berkeley DB</b><br><font size="-1"> version 4.3.21</font></EM>
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com.sleepycat.collections</FONT>
<BR>
Class StoredKeySet</H2>
<PRE>
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
<IMG SRC="../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../com/sleepycat/collections/StoredContainer.html" title="class in com.sleepycat.collections">com.sleepycat.collections.StoredContainer</A>
<IMG SRC="../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../com/sleepycat/collections/StoredCollection.html" title="class in com.sleepycat.collections">com.sleepycat.collections.StoredCollection</A>
<IMG SRC="../../../resources/inherit.gif" ALT="extended by"><B>com.sleepycat.collections.StoredKeySet</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Cloneable.html" title="class or interface in java.lang">Cloneable</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html" title="class or interface in java.util">Collection</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A></DD>
</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../com/sleepycat/collections/StoredSortedKeySet.html" title="class in com.sleepycat.collections">StoredSortedKeySet</A></DD>
</DL>
<HR>
<DL>
<DT>public class <B>StoredKeySet</B><DT>extends <A HREF="../../../com/sleepycat/collections/StoredCollection.html" title="class in com.sleepycat.collections">StoredCollection</A><DT>implements <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A></DL>
<P>
The Set returned by Map.keySet() and which can also be constructed directly
if a Map is not needed.
Since this collection is a set it only contains one element for each key,
even when duplicates are allowed. Key set iterators are therefore
particularly useful for enumerating the unique keys of a store or index that
allows duplicates.
<p><em>Note that this class does not conform to the standard Java
collections interface in the following ways:</em></p>
<ul>
<li>The <A HREF="../../../com/sleepycat/collections/StoredContainer.html#size()"><CODE>StoredContainer.size()</CODE></A> method always throws
<code>UnsupportedOperationException</code> because, for performance reasons,
databases do not maintain their total record count.</li>
<li>All iterators must be explicitly closed using <A HREF="../../../com/sleepycat/collections/StoredIterator.html#close()"><CODE>StoredIterator.close()</CODE></A> or <A HREF="../../../com/sleepycat/collections/StoredIterator.html#close(java.util.Iterator)"><CODE>StoredIterator.close(java.util.Iterator)</CODE></A>
to release the underlying database cursor resources.</li>
</ul>
<P>
<P>
<HR>
<P>
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<B>Constructor Summary</B></FONT></TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/StoredKeySet.html#StoredKeySet(com.sleepycat.db.Database, com.sleepycat.bind.EntryBinding, boolean)">StoredKeySet</A></B>(<A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</A> database,
<A HREF="../../../com/sleepycat/bind/EntryBinding.html" title="interface in com.sleepycat.bind">EntryBinding</A> keyBinding,
boolean writeAllowed)</CODE>
<BR>
Creates a key set view of a <A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db"><CODE>Database</CODE></A>.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../com/sleepycat/collections/StoredKeySet.html#add(java.lang.Object)">add</A></B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> key)</CODE>
<BR>
Adds the specified key to this set if it is not already present
(optional operation).</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="../../../com/sleepycat/collections/StoredKeySet.html#contains(java.lang.Object)">contains</A></B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> key)</CODE>
<BR>
Returns true if this set contains 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="../../../com/sleepycat/collections/StoredKeySet.html#remove(java.lang.Object)">remove</A></B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> key)</CODE>
<BR>
Removes the specified key from this set if it is present (optional
operation).</TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_com.sleepycat.collections.StoredCollection"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class com.sleepycat.collections.<A HREF="../../../com/sleepycat/collections/StoredCollection.html" title="class in com.sleepycat.collections">StoredCollection</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../com/sleepycat/collections/StoredCollection.html#addAll(java.util.Collection)">addAll</A>, <A HREF="../../../com/sleepycat/collections/StoredCollection.html#containsAll(java.util.Collection)">containsAll</A>, <A HREF="../../../com/sleepycat/collections/StoredCollection.html#equals(java.lang.Object)">equals</A>, <A HREF="../../../com/sleepycat/collections/StoredCollection.html#hashCode()">hashCode</A>, <A HREF="../../../com/sleepycat/collections/StoredCollection.html#iterator()">iterator</A>, <A HREF="../../../com/sleepycat/collections/StoredCollection.html#iterator(boolean)">iterator</A>, <A HREF="../../../com/sleepycat/collections/StoredCollection.html#join(com.sleepycat.collections.StoredContainer[], java.lang.Object[], com.sleepycat.db.JoinConfig)">join</A>, <A HREF="../../../com/sleepycat/collections/StoredCollection.html#removeAll(java.util.Collection)">removeAll</A>, <A HREF="../../../com/sleepycat/collections/StoredCollection.html#retainAll(java.util.Collection)">retainAll</A>, <A HREF="../../../com/sleepycat/collections/StoredCollection.html#toArray()">toArray</A>, <A HREF="../../../com/sleepycat/collections/StoredCollection.html#toArray(java.lang.Object[])">toArray</A>, <A HREF="../../../com/sleepycat/collections/StoredCollection.html#toList()">toList</A>, <A HREF="../../../com/sleepycat/collections/StoredCollection.html#toString()">toString</A></CODE></TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_com.sleepycat.collections.StoredContainer"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class com.sleepycat.collections.<A HREF="../../../com/sleepycat/collections/StoredContainer.html" title="class in com.sleepycat.collections">StoredContainer</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../com/sleepycat/collections/StoredContainer.html#areDuplicatesAllowed()">areDuplicatesAllowed</A>, <A HREF="../../../com/sleepycat/collections/StoredContainer.html#areDuplicatesOrdered()">areDuplicatesOrdered</A>, <A HREF="../../../com/sleepycat/collections/StoredContainer.html#areKeysRenumbered()">areKeysRenumbered</A>, <A HREF="../../../com/sleepycat/collections/StoredContainer.html#clear()">clear</A>, <A HREF="../../../com/sleepycat/collections/StoredContainer.html#isDirtyRead()">isDirtyRead</A>, <A HREF="../../../com/sleepycat/collections/StoredContainer.html#isDirtyReadAllowed()">isDirtyReadAllowed</A>, <A HREF="../../../com/sleepycat/collections/StoredContainer.html#isEmpty()">isEmpty</A>, <A HREF="../../../com/sleepycat/collections/StoredContainer.html#isOrdered()">isOrdered</A>, <A HREF="../../../com/sleepycat/collections/StoredContainer.html#isSecondary()">isSecondary</A>, <A HREF="../../../com/sleepycat/collections/StoredContainer.html#isTransactional()">isTransactional</A>, <A HREF="../../../com/sleepycat/collections/StoredContainer.html#isWriteAllowed()">isWriteAllowed</A>, <A HREF="../../../com/sleepycat/collections/StoredContainer.html#size()">size</A></CODE></TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
</TR>
</TABLE>
<A NAME="methods_inherited_from_class_java.util.Set"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from interface java.util.<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#addAll(java.util.Collection)" title="class or interface in java.util">addAll</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#clear()" title="class or interface in java.util">clear</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#containsAll(java.util.Collection)" title="class or interface in java.util">containsAll</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#equals(java.lang.Object)" title="class or interface in java.util">equals</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#hashCode()" title="class or interface in java.util">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#isEmpty()" title="class or interface in java.util">isEmpty</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#iterator()" title="class or interface in java.util">iterator</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#removeAll(java.util.Collection)" title="class or interface in java.util">removeAll</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#retainAll(java.util.Collection)" title="class or interface in java.util">retainAll</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#size()" title="class or interface in java.util">size</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#toArray()" title="class or interface in java.util">toArray</A>, <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#toArray(java.lang.Object[])" title="class or interface in java.util">toArray</A></CODE></TD>
</TR>
</TABLE>
<P>
<!-- ============ FIELD DETAIL =========== -->
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<A NAME="StoredKeySet(com.sleepycat.db.Database, com.sleepycat.bind.EntryBinding, boolean)"><!-- --></A><H3>
StoredKeySet</H3>
<PRE>
public <B>StoredKeySet</B>(<A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db">Database</A> database,
<A HREF="../../../com/sleepycat/bind/EntryBinding.html" title="interface in com.sleepycat.bind">EntryBinding</A> keyBinding,
boolean writeAllowed)</PRE>
<DL>
<DD>Creates a key set view of a <A HREF="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db"><CODE>Database</CODE></A>.
<P>
<DT><B>Parameters:</B><DD><CODE>database</CODE> - is the Database underlying the new collection.<DD><CODE>keyBinding</CODE> - is the binding used to translate between key buffers
and key objects.<DD><CODE>writeAllowed</CODE> - is true to create a read-write collection or false
to create a read-only collection.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - if formats are not consistently
defined or a parameter is invalid.
<DD><CODE>RuntimeExceptionWrapper</CODE> - if a <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db"><CODE>DatabaseException</CODE></A> is
thrown.</DL>
<!-- ============ METHOD DETAIL ========== -->
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<A NAME="add(java.lang.Object)"><!-- --></A><H3>
add</H3>
<PRE>
public boolean <B>add</B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> key)</PRE>
<DL>
<DD>Adds the specified key to this set if it is not already present
(optional operation).
When a key is added the value in the underlying data store will be
empty.
This method conforms to the <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#add(java.lang.Object)" title="class or interface in java.util"><CODE>Set.add(java.lang.Object)</CODE></A> interface.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#add(java.lang.Object)" title="class or interface in java.util">add</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/UnsupportedOperationException.html" title="class or interface in java.lang">UnsupportedOperationException</A></CODE> - if the collection is indexed, or
if the collection is read-only.
<DD><CODE>RuntimeExceptionWrapper</CODE> - if a <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db"><CODE>DatabaseException</CODE></A> is
thrown.</DL>
</DD>
</DL>
<HR>
<A NAME="remove(java.lang.Object)"><!-- --></A><H3>
remove</H3>
<PRE>
public boolean <B>remove</B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> key)</PRE>
<DL>
<DD>Removes the specified key from this set if it is present (optional
operation).
If duplicates are allowed, this method removes all duplicates for the
given key.
This method conforms to the <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#remove(java.lang.Object)" title="class or interface in java.util"><CODE>Set.remove(java.lang.Object)</CODE></A> interface.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#remove(java.lang.Object)" title="class or interface in java.util">remove</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/UnsupportedOperationException.html" title="class or interface in java.lang">UnsupportedOperationException</A></CODE> - if the collection is read-only.
<DD><CODE>RuntimeExceptionWrapper</CODE> - if a <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db"><CODE>DatabaseException</CODE></A> is
thrown.</DL>
</DD>
</DL>
<HR>
<A NAME="contains(java.lang.Object)"><!-- --></A><H3>
contains</H3>
<PRE>
public boolean <B>contains</B>(<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> key)</PRE>
<DL>
<DD>Returns true if this set contains the specified key.
This method conforms to the <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#contains(java.lang.Object)" title="class or interface in java.util"><CODE>Set.contains(java.lang.Object)</CODE></A> interface.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html#contains(java.lang.Object)" title="class or interface in java.util">contains</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>RuntimeExceptionWrapper</CODE> - if a <A HREF="../../../com/sleepycat/db/DatabaseException.html" title="class in com.sleepycat.db"><CODE>DatabaseException</CODE></A> is
thrown.</DL>
</DD>
</DL>
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