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StoredContainer
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com.sleepycat.bdb.collection</FONT>
<BR>
Class StoredContainer</H2>
<PRE>
java.lang.Object
<IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>com.sleepycat.bdb.collection.StoredContainer</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD>java.lang.Cloneable</DD>
</DL>
<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../../com/sleepycat/bdb/collection/StoredCollection.html" title="class in com.sleepycat.bdb.collection">StoredCollection</A>, <A HREF="../../../../com/sleepycat/bdb/collection/StoredMap.html" title="class in com.sleepycat.bdb.collection">StoredMap</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public abstract class <B>StoredContainer</B><DT>extends java.lang.Object<DT>implements java.lang.Cloneable</DL>
</PRE>
<P>
A abstract base class for all stored collections and maps. This class
provides implementations of methods that are common to the <CODE>Collection</CODE> and the <CODE>Map</CODE> interfaces, namely <A HREF="../../../../com/sleepycat/bdb/collection/StoredContainer.html#clear()"><CODE>clear()</CODE></A>, <A HREF="../../../../com/sleepycat/bdb/collection/StoredContainer.html#isEmpty()"><CODE>isEmpty()</CODE></A> and <A HREF="../../../../com/sleepycat/bdb/collection/StoredContainer.html#size()"><CODE>size()</CODE></A>.
<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/bdb/collection/StoredContainer.html#isWriteAllowed()"><CODE>isWriteAllowed()</CODE></A></li>
<li><A HREF="../../../../com/sleepycat/bdb/collection/StoredContainer.html#isIndexed()"><CODE>isIndexed()</CODE></A></li>
<li><A HREF="../../../../com/sleepycat/bdb/collection/StoredContainer.html#isOrdered()"><CODE>isOrdered()</CODE></A></li>
<li><A HREF="../../../../com/sleepycat/bdb/collection/StoredContainer.html#areDuplicatesAllowed()"><CODE>areDuplicatesAllowed()</CODE></A></li>
<li><A HREF="../../../../com/sleepycat/bdb/collection/StoredContainer.html#areDuplicatesOrdered()"><CODE>areDuplicatesOrdered()</CODE></A></li>
<li><A HREF="../../../../com/sleepycat/bdb/collection/StoredContainer.html#areKeysRenumbered()"><CODE>areKeysRenumbered()</CODE></A></li>
<li><A HREF="../../../../com/sleepycat/bdb/collection/StoredContainer.html#isDirtyReadAllowed()"><CODE>isDirtyReadAllowed()</CODE></A></li>
<li><A HREF="../../../../com/sleepycat/bdb/collection/StoredContainer.html#isDirtyReadEnabled()"><CODE>isDirtyReadEnabled()</CODE></A></li>
<li><A HREF="../../../../com/sleepycat/bdb/collection/StoredContainer.html#isAutoCommit()"><CODE>isAutoCommit()</CODE></A></li>
<li><A HREF="../../../../com/sleepycat/bdb/collection/StoredContainer.html#isTransactional()"><CODE>isTransactional()</CODE></A></li>
</ul>
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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/bdb/collection/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/bdb/collection/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/bdb/collection/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/bdb/collection/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/bdb/collection/StoredContainer.html#isAutoCommit()">isAutoCommit</A></B>()</CODE>
<BR>
Returns whether auto-commit is enabled for this container or for its
associated <A HREF="../../../../com/sleepycat/db/DbEnv.html" title="class in com.sleepycat.db"><CODE>DbEnv</CODE></A>.</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/bdb/collection/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/bdb/collection/StoredContainer.html#isDirtyReadEnabled()">isDirtyReadEnabled</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/bdb/collection/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/bdb/collection/StoredContainer.html#isIndexed()">isIndexed</A></B>()</CODE>
<BR>
Returns whether this container is a view on a <A HREF="../../../../com/sleepycat/bdb/DataIndex.html" title="class in com.sleepycat.bdb"><CODE>DataIndex</CODE></A> rather
than directly on a <A HREF="../../../../com/sleepycat/bdb/DataStore.html" title="class in com.sleepycat.bdb"><CODE>DataStore</CODE></A>.</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/bdb/collection/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/bdb/collection/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/bdb/collection/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/bdb/collection/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">
<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
<P>
<!-- ============ METHOD DETAIL ========== -->
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<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 <CODE>Map</CODE> or <CODE>Collection</CODE> 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.
Dirty-read is allowed if Db.DB_DIRTY_READ was specified when opening the
database of the underlying Store and Index (if any) for this container.
Even when dirty-read is allowed it must specifically be enabled by
calling one of the <A HREF="../../../../com/sleepycat/bdb/collection/StoredCollections.html" title="class in com.sleepycat.bdb.collection"><CODE>StoredCollections</CODE></A> methods.
This method does not exist in the standard <CODE>Map</CODE> or <CODE>Collection</CODE> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether dirty-read is allowed.</DL>
</DD>
</DL>
<HR>
<A NAME="isDirtyReadEnabled()"><!-- --></A><H3>
isDirtyReadEnabled</H3>
<PRE>
public final boolean <B>isDirtyReadEnabled</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/bdb/collection/StoredContainer.html#isDirtyReadAllowed()"><CODE>isDirtyReadAllowed()</CODE></A> returns
false.
This method does not exist in the standard <CODE>Map</CODE> or <CODE>Collection</CODE> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether dirty-read is enabled.</DL>
</DD>
</DL>
<HR>
<A NAME="isAutoCommit()"><!-- --></A><H3>
isAutoCommit</H3>
<PRE>
public final boolean <B>isAutoCommit</B>()</PRE>
<DL>
<DD>Returns whether auto-commit is enabled for this container or for its
associated <A HREF="../../../../com/sleepycat/db/DbEnv.html" title="class in com.sleepycat.db"><CODE>DbEnv</CODE></A>.
If auto-commit is enabled, a transaction will be started and committed
automatically for each write operation when no transaction is active.
Auto-commit only applies to container methods. It does not apply to
iterator methods and these always require an explict transaction.
Auto-commit is disabled by default for a container but may be enabled
for an entire environment using <A HREF="../../../../com/sleepycat/db/DbEnv.html#setFlags(int, boolean)"><CODE>DbEnv.setFlags(int, boolean)</CODE></A>.
This method always returns false if <A HREF="../../../../com/sleepycat/bdb/collection/StoredContainer.html#isTransactional()"><CODE>isTransactional()</CODE></A> returns
false.
This method does not exist in the standard <CODE>Map</CODE> or <CODE>Collection</CODE> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether auto-commit 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 <CODE>Map</CODE> or <CODE>Collection</CODE> 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 <CODE>Map</CODE> or <CODE>Collection</CODE> 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 <CODE>Map</CODE> or <CODE>Collection</CODE> 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 <CODE>Map</CODE> or <CODE>Collection</CODE> 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 <CODE>Map</CODE> or <CODE>Collection</CODE> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether keys are ordered.</DL>
</DD>
</DL>
<HR>
<A NAME="isIndexed()"><!-- --></A><H3>
isIndexed</H3>
<PRE>
public final boolean <B>isIndexed</B>()</PRE>
<DL>
<DD>Returns whether this container is a view on a <A HREF="../../../../com/sleepycat/bdb/DataIndex.html" title="class in com.sleepycat.bdb"><CODE>DataIndex</CODE></A> rather
than directly on a <A HREF="../../../../com/sleepycat/bdb/DataStore.html" title="class in com.sleepycat.bdb"><CODE>DataStore</CODE></A>.
This method does not exist in the standard <CODE>Map</CODE> or <CODE>Collection</CODE> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>whether the view is indexed.</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 <CODE>Collection.size()</CODE> and <CODE>Map.size()</CODE> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>always throws an exception.
<DT><B>Throws:</B>
<DD><CODE>java.lang.UnsupportedOperationException</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 <CODE>Collection.isEmpty()</CODE> and <CODE>Map.isEmpty()</CODE> 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/bdb/util/RuntimeExceptionWrapper.html" title="class in com.sleepycat.bdb.util">RuntimeExceptionWrapper</A></CODE> - if a <A HREF="../../../../com/sleepycat/db/DbException.html" title="class in com.sleepycat.db"><CODE>DbException</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 <CODE>Collection.clear()</CODE> and <CODE>Map.clear()</CODE> interfaces.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Throws:</B>
<DD><CODE>java.lang.UnsupportedOperationException</CODE> - if the container is read-only.
<DD><CODE><A HREF="../../../../com/sleepycat/bdb/util/RuntimeExceptionWrapper.html" title="class in com.sleepycat.bdb.util">RuntimeExceptionWrapper</A></CODE> - if a <A HREF="../../../../com/sleepycat/db/DbException.html" title="class in com.sleepycat.db"><CODE>DbException</CODE></A> is thrown.</DL>
</DD>
</DL>
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