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StoredContainer (Sleepycat Software, Inc. - Berkeley DB Java API)
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<b>Berkeley DB</b><br><font size="-1"> version 4.3.29</font></EM>
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com.sleepycat.collections</FONT>
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Class StoredContainer</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"><B>com.sleepycat.collections.StoredContainer</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></DD>
</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../com/sleepycat/collections/StoredCollection.html" title="class in com.sleepycat.collections">StoredCollection</A>, <A HREF="../../../com/sleepycat/collections/StoredMap.html" title="class in com.sleepycat.collections">StoredMap</A></DD>
</DL>
<HR>
<DL>
<DT>public abstract class <B>StoredContainer</B><DT>extends <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A><DT>implements <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/lang/Cloneable.html" title="class or interface in java.lang">Cloneable</A></DL>
<P>
A abstract base class for all stored collections and maps. This class
provides implementations of methods that are common to the <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html" title="class or interface in java.util"><CODE>Collection</CODE></A> and the <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html" title="class or interface in java.util"><CODE>Map</CODE></A> interfaces, namely
<A HREF="../../../com/sleepycat/collections/StoredContainer.html#clear()"><CODE>clear()</CODE></A>, <A HREF="../../../com/sleepycat/collections/StoredContainer.html#isEmpty()"><CODE>isEmpty()</CODE></A> and <A HREF="../../../com/sleepycat/collections/StoredContainer.html#size()"><CODE>size()</CODE></A>.
<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>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>In addition, this class provides the following methods for stored
collections only. Note that the use of these methods is not compatible with
the standard Java collections interface.</p>
<ul>
<li><A HREF="../../../com/sleepycat/collections/StoredContainer.html#isWriteAllowed()"><CODE>isWriteAllowed()</CODE></A></li>
<li><A HREF="../../../com/sleepycat/collections/StoredContainer.html#isSecondary()"><CODE>isSecondary()</CODE></A></li>
<li><A HREF="../../../com/sleepycat/collections/StoredContainer.html#isOrdered()"><CODE>isOrdered()</CODE></A></li>
<li><A HREF="../../../com/sleepycat/collections/StoredContainer.html#areDuplicatesAllowed()"><CODE>areDuplicatesAllowed()</CODE></A></li>
<li><A HREF="../../../com/sleepycat/collections/StoredContainer.html#areDuplicatesOrdered()"><CODE>areDuplicatesOrdered()</CODE></A></li>
<li><A HREF="../../../com/sleepycat/collections/StoredContainer.html#areKeysRenumbered()"><CODE>areKeysRenumbered()</CODE></A></li>
<li><A HREF="../../../com/sleepycat/collections/StoredContainer.html#isDirtyReadAllowed()"><CODE>isDirtyReadAllowed()</CODE></A></li>
<li><A HREF="../../../com/sleepycat/collections/StoredContainer.html#isDirtyRead()"><CODE>isDirtyRead()</CODE></A></li>
<li><A HREF="../../../com/sleepycat/collections/StoredContainer.html#isTransactional()"><CODE>isTransactional()</CODE></A></li>
</ul>
<P>
<P>
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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/StoredContainer.html#areDuplicatesAllowed()">areDuplicatesAllowed</A></B>()</CODE>
<BR>
Returns whether duplicate keys are allowed in this container.</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/StoredContainer.html#areDuplicatesOrdered()">areDuplicatesOrdered</A></B>()</CODE>
<BR>
Returns whether duplicate keys are allowed and sorted by element value.</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/StoredContainer.html#areKeysRenumbered()">areKeysRenumbered</A></B>()</CODE>
<BR>
Returns whether keys are renumbered when insertions and deletions occur.</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="../../../com/sleepycat/collections/StoredContainer.html#clear()">clear</A></B>()</CODE>
<BR>
Removes all mappings or elements from this map or collection (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/StoredContainer.html#isDirtyRead()">isDirtyRead</A></B>()</CODE>
<BR>
Returns whether dirty-read is enabled for this container.</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/StoredContainer.html#isDirtyReadAllowed()">isDirtyReadAllowed</A></B>()</CODE>
<BR>
Returns whether dirty-read is allowed for this container.</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/StoredContainer.html#isEmpty()">isEmpty</A></B>()</CODE>
<BR>
Returns true if this map or collection contains no mappings or elements.</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/StoredContainer.html#isOrdered()">isOrdered</A></B>()</CODE>
<BR>
Returns whether keys are ordered in this container.</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/StoredContainer.html#isSecondary()">isSecondary</A></B>()</CODE>
<BR>
Returns whether this container is a view on a secondary database rather
than directly on a primary database.</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/StoredContainer.html#isTransactional()">isTransactional</A></B>()</CODE>
<BR>
Returns whether the databases underlying this container are
transactional.</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/StoredContainer.html#isWriteAllowed()">isWriteAllowed</A></B>()</CODE>
<BR>
Returns true if this is a read-write container or false if this is a
read-only container.</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="../../../com/sleepycat/collections/StoredContainer.html#size()">size</A></B>()</CODE>
<BR>
Always throws UnsupportedOperationException.</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#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <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#hashCode()" title="class or interface in java.lang">hashCode</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#toString()" title="class or interface in java.lang">toString</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>
<P>
<!-- ============ FIELD DETAIL =========== -->
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<!-- ============ METHOD DETAIL ========== -->
<A NAME="method_detail"><!-- --></A>
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Method Detail</B></FONT></TD>
</TR>
</TABLE>
<A NAME="isWriteAllowed()"><!-- --></A><H3>
isWriteAllowed</H3>
<PRE>
public final boolean <B>isWriteAllowed</B>()</PRE>
<DL>
<DD>Returns true if this is a read-write container or false if this is a
read-only container.
This method does not exist in the standard <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html" title="class or interface in java.util"><CODE>Map</CODE></A> or
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html" title="class or interface in java.util"><CODE>Collection</CODE></A> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether write is allowed.</DL>
</DD>
</DL>
<HR>
<A NAME="isDirtyReadAllowed()"><!-- --></A><H3>
isDirtyReadAllowed</H3>
<PRE>
public final boolean <B>isDirtyReadAllowed</B>()</PRE>
<DL>
<DD>Returns whether dirty-read is allowed for this container.
For the JE product, dirty-read is always allowed; for the DB product,
dirty-read is allowed if it was configured for the underlying database
for this container.
Even when dirty-read is allowed it must specifically be enabled by
calling one of the <A HREF="../../../com/sleepycat/collections/StoredCollections.html" title="class in com.sleepycat.collections"><CODE>StoredCollections</CODE></A> methods.
This method does not exist in the standard <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html" title="class or interface in java.util"><CODE>Map</CODE></A> or
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html" title="class or interface in java.util"><CODE>Collection</CODE></A> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether dirty-read is allowed.</DL>
</DD>
</DL>
<HR>
<A NAME="isDirtyRead()"><!-- --></A><H3>
isDirtyRead</H3>
<PRE>
public final boolean <B>isDirtyRead</B>()</PRE>
<DL>
<DD>Returns whether dirty-read is enabled for this container.
If dirty-read is enabled, data will be read that is modified but not
committed.
Dirty-read is disabled by default.
This method always returns false if <A HREF="../../../com/sleepycat/collections/StoredContainer.html#isDirtyReadAllowed()"><CODE>isDirtyReadAllowed()</CODE></A> returns
false.
This method does not exist in the standard <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html" title="class or interface in java.util"><CODE>Map</CODE></A> or
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html" title="class or interface in java.util"><CODE>Collection</CODE></A> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether dirty-read is enabled.</DL>
</DD>
</DL>
<HR>
<A NAME="isTransactional()"><!-- --></A><H3>
isTransactional</H3>
<PRE>
public final boolean <B>isTransactional</B>()</PRE>
<DL>
<DD>Returns whether the databases underlying this container are
transactional.
Even in a transactional environment, a database will be transactional
only if it was opened within a transaction or if the auto-commit option
was specified when it was opened.
This method does not exist in the standard <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html" title="class or interface in java.util"><CODE>Map</CODE></A> or
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html" title="class or interface in java.util"><CODE>Collection</CODE></A> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether the database is transactional.</DL>
</DD>
</DL>
<HR>
<A NAME="areDuplicatesAllowed()"><!-- --></A><H3>
areDuplicatesAllowed</H3>
<PRE>
public final boolean <B>areDuplicatesAllowed</B>()</PRE>
<DL>
<DD>Returns whether duplicate keys are allowed in this container.
Duplicates are optionally allowed for HASH and BTREE databases.
This method does not exist in the standard <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html" title="class or interface in java.util"><CODE>Map</CODE></A> or
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html" title="class or interface in java.util"><CODE>Collection</CODE></A> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether duplicates are allowed.</DL>
</DD>
</DL>
<HR>
<A NAME="areDuplicatesOrdered()"><!-- --></A><H3>
areDuplicatesOrdered</H3>
<PRE>
public final boolean <B>areDuplicatesOrdered</B>()</PRE>
<DL>
<DD>Returns whether duplicate keys are allowed and sorted by element value.
Duplicates are optionally sorted for HASH and BTREE databases.
This method does not exist in the standard <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html" title="class or interface in java.util"><CODE>Map</CODE></A> or
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html" title="class or interface in java.util"><CODE>Collection</CODE></A> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether duplicates are ordered.</DL>
</DD>
</DL>
<HR>
<A NAME="areKeysRenumbered()"><!-- --></A><H3>
areKeysRenumbered</H3>
<PRE>
public final boolean <B>areKeysRenumbered</B>()</PRE>
<DL>
<DD>Returns whether keys are renumbered when insertions and deletions occur.
Keys are optionally renumbered for RECNO databases.
This method does not exist in the standard <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html" title="class or interface in java.util"><CODE>Map</CODE></A> or
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html" title="class or interface in java.util"><CODE>Collection</CODE></A> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether keys are renumbered.</DL>
</DD>
</DL>
<HR>
<A NAME="isOrdered()"><!-- --></A><H3>
isOrdered</H3>
<PRE>
public final boolean <B>isOrdered</B>()</PRE>
<DL>
<DD>Returns whether keys are ordered in this container.
Keys are ordered for BTREE, RECNO and QUEUE database.
This method does not exist in the standard <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html" title="class or interface in java.util"><CODE>Map</CODE></A> or
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html" title="class or interface in java.util"><CODE>Collection</CODE></A> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether keys are ordered.</DL>
</DD>
</DL>
<HR>
<A NAME="isSecondary()"><!-- --></A><H3>
isSecondary</H3>
<PRE>
public final boolean <B>isSecondary</B>()</PRE>
<DL>
<DD>Returns whether this container is a view on a secondary database rather
than directly on a primary database.
This method does not exist in the standard <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html" title="class or interface in java.util"><CODE>Map</CODE></A> or
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html" title="class or interface in java.util"><CODE>Collection</CODE></A> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether the view is for a secondary database.</DL>
</DD>
</DL>
<HR>
<A NAME="size()"><!-- --></A><H3>
size</H3>
<PRE>
public int <B>size</B>()</PRE>
<DL>
<DD>Always throws UnsupportedOperationException. The size of a database
cannot be obtained reliably or inexpensively.
This method therefore violates the <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html#size()" title="class or interface in java.util"><CODE>Collection.size()</CODE></A> and
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html#size()" title="class or interface in java.util"><CODE>Map.size()</CODE></A> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>always throws an exception.
<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> - unconditionally.</DL>
</DD>
</DL>
<HR>
<A NAME="isEmpty()"><!-- --></A><H3>
isEmpty</H3>
<PRE>
public boolean <B>isEmpty</B>()</PRE>
<DL>
<DD>Returns true if this map or collection contains no mappings or elements.
This method conforms to the <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html#isEmpty()" title="class or interface in java.util"><CODE>Collection.isEmpty()</CODE></A> and
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html#isEmpty()" title="class or interface in java.util"><CODE>Map.isEmpty()</CODE></A> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether the container is empty.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../com/sleepycat/util/RuntimeExceptionWrapper.html" title="class in com.sleepycat.util">RuntimeExceptionWrapper</A></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="clear()"><!-- --></A><H3>
clear</H3>
<PRE>
public void <B>clear</B>()</PRE>
<DL>
<DD>Removes all mappings or elements from this map or collection (optional
operation).
This method conforms to the <A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Collection.html#clear()" title="class or interface in java.util"><CODE>Collection.clear()</CODE></A> and
<A HREF="http://java.sun.com/j2se/1.3/docs/api/java/util/Map.html#clear()" title="class or interface in java.util"><CODE>Map.clear()</CODE></A> interfaces.
<P>
<DD><DL>
</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 container is read-only.
<DD><CODE><A HREF="../../../com/sleepycat/util/RuntimeExceptionWrapper.html" title="class in com.sleepycat.util">RuntimeExceptionWrapper</A></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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