btree.html

jxta的api库

 associated pointer for it.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../net/jxta/impl/xindice/core/filer/BTree.html#setRootNode(net.jxta.impl.xindice.core.filer.BTree.BTreeNode)">setRootNode</A></B>(net.jxta.impl.xindice.core.filer.BTree.BTreeNode&nbsp;rootNode)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;setRootNode resets the file's root to the provided
 BTreeNode's page number.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../net/jxta/impl/xindice/core/filer/BTree.html#setRootNode(net.jxta.impl.xindice.core.filer.BTree.BTreeRootInfo, net.jxta.impl.xindice.core.filer.BTree.BTreeNode)">setRootNode</A></B>(<A HREF="../../../../../../net/jxta/impl/xindice/core/filer/BTree.BTreeRootInfo.html" title="class in net.jxta.impl.xindice.core.filer">BTree.BTreeRootInfo</A>&nbsp;root,
            net.jxta.impl.xindice.core.filer.BTree.BTreeNode&nbsp;newRoot)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;setRootNode resets the root for the specified root object to the
 provided BTreeNode's page number.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../net/jxta/impl/xindice/core/filer/BTree.html#setSync(boolean)">setSync</A></B>(boolean&nbsp;sync)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Setting this option forces all system buffers with the underlying device
 if sync is set writes return after all modified data and attributes of the DB
 have been written to the device.
 </TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_net.jxta.impl.xindice.core.filer.Paged"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TD><B>Methods inherited from class net.jxta.impl.xindice.core.filer.<A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html" title="class in net.jxta.impl.xindice.core.filer">Paged</A></B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#checkOpened()">checkOpened</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#close()">close</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#deleteArrayInt(int[], int)">deleteArrayInt</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#deleteArrayLong(long[], int)">deleteArrayLong</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#deleteArrayShort(short[], int)">deleteArrayShort</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#deleteArrayValue(net.jxta.impl.xindice.core.data.Value[], int)">deleteArrayValue</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#drop()">drop</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#exists()">exists</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#flush()">flush</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#getDescriptor()">getDescriptor</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#getFile()">getFile</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#getFileHeader()">getFileHeader</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#getFreePage()">getFreePage</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#getPage(long)">getPage</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#getPage(java.lang.Long)">getPage</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#insertArrayInt(int[], int, int)">insertArrayInt</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#insertArrayLong(long[], long, int)">insertArrayLong</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#insertArrayShort(short[], short, int)">insertArrayShort</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#insertArrayValue(net.jxta.impl.xindice.core.data.Value[], net.jxta.impl.xindice.core.data.Value, int)">insertArrayValue</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#isOpened()">isOpened</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#putDescriptor(java.io.RandomAccessFile)">putDescriptor</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#readValue(long)">readValue</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#readValue(net.jxta.impl.xindice.core.filer.Paged.Page)">readValue</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#setFile(java.io.File)">setFile</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#unlinkPages(long)">unlinkPages</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#unlinkPages(net.jxta.impl.xindice.core.filer.Paged.Page)">unlinkPages</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#writeValue(long, net.jxta.impl.xindice.core.data.Value)">writeValue</A>, <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#writeValue(net.jxta.impl.xindice.core.filer.Paged.Page, net.jxta.impl.xindice.core.data.Value)">writeValue</A></CODE></TD>
</TR>
</TABLE>
&nbsp;<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.Object</B></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
&nbsp;
<P>

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

<A NAME="field_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Field Detail</B></FONT></TD>
</TR>
</TABLE>

<A NAME="LEAF"><!-- --></A><H3>
LEAF</H3>
<PRE>
protected static final byte <B>LEAF</B></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#net.jxta.impl.xindice.core.filer.BTree.LEAF">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="BRANCH"><!-- --></A><H3>
BRANCH</H3>
<PRE>
protected static final byte <B>BRANCH</B></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#net.jxta.impl.xindice.core.filer.BTree.BRANCH">Constant Field Values</A></DL>
</DL>
<HR>

<A NAME="STREAM"><!-- --></A><H3>
STREAM</H3>
<PRE>
protected static final byte <B>STREAM</B></PRE>
<DL>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../../../../constant-values.html#net.jxta.impl.xindice.core.filer.BTree.STREAM">Constant Field Values</A></DL>
</DL>

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

<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TD>
</TR>
</TABLE>

<A NAME="BTree()"><!-- --></A><H3>
BTree</H3>
<PRE>
public <B>BTree</B>()</PRE>
<DL>
</DL>
<HR>

<A NAME="BTree(java.io.File)"><!-- --></A><H3>
BTree</H3>
<PRE>
public <B>BTree</B>(java.io.File&nbsp;file)</PRE>
<DL>
</DL>

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

<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=1><FONT SIZE="+2">
<B>Method Detail</B></FONT></TD>
</TR>
</TABLE>

<A NAME="setSync(boolean)"><!-- --></A><H3>
setSync</H3>
<PRE>
public void <B>setSync</B>(boolean&nbsp;sync)</PRE>
<DL>
<DD>Setting this option forces all system buffers with the underlying device
 if sync is set writes return after all modified data and attributes of the DB
 have been written to the device.
 by default sync is true.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="open()"><!-- --></A><H3>
open</H3>
<PRE>
public boolean <B>open</B>()
             throws <A HREF="../../../../../../net/jxta/impl/xindice/core/DBException.html" title="class in net.jxta.impl.xindice.core">DBException</A></PRE>
<DL>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#open()">open</A></CODE> in class <CODE><A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html" title="class in net.jxta.impl.xindice.core.filer">Paged</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../../net/jxta/impl/xindice/core/DBException.html" title="class in net.jxta.impl.xindice.core">DBException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="create()"><!-- --></A><H3>
create</H3>
<PRE>
public boolean <B>create</B>()
               throws <A HREF="../../../../../../net/jxta/impl/xindice/core/DBException.html" title="class in net.jxta.impl.xindice.core">DBException</A></PRE>
<DL>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html#create()">create</A></CODE> in class <CODE><A HREF="../../../../../../net/jxta/impl/xindice/core/filer/Paged.html" title="class in net.jxta.impl.xindice.core.filer">Paged</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../../net/jxta/impl/xindice/core/DBException.html" title="class in net.jxta.impl.xindice.core">DBException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="addValue(net.jxta.impl.xindice.core.data.Value, long)"><!-- --></A><H3>
addValue</H3>
<PRE>
public long <B>addValue</B>(<A HREF="../../../../../../net/jxta/impl/xindice/core/data/Value.html" title="class in net.jxta.impl.xindice.core.data">Value</A>&nbsp;value,
                     long&nbsp;pointer)
              throws java.io.IOException,
                     <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/BTreeException.html" title="class in net.jxta.impl.xindice.core.filer">BTreeException</A></PRE>
<DL>
<DD>addValue adds a Value to the BTree and associates a pointer with
 it.  The pointer can be used for referencing any type of data, it
 just so happens that Xindice uses it for referencing pages of
 associated data in the BTree file or other files.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - The Value to add<DD><CODE>pointer</CODE> - The pointer to associate with it
<DT><B>Returns:</B><DD>The previous value for the pointer (or -1)
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE>
<DD><CODE><A HREF="../../../../../../net/jxta/impl/xindice/core/filer/BTreeException.html" title="class in net.jxta.impl.xindice.core.filer">BTreeException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="addValue(net.jxta.impl.xindice.core.filer.BTree.BTreeRootInfo, net.jxta.impl.xindice.core.data.Value, long)"><!-- --></A><H3>
addValue</H3>
<PRE>
public long <B>addValue</B>(<A HREF="../../../../../../net/jxta/impl/xindice/core/filer/BTree.BTreeRootInfo.html" title="class in net.jxta.impl.xindice.core.filer">BTree.BTreeRootInfo</A>&nbsp;root,
                     <A HREF="../../../../../../net/jxta/impl/xindice/core/data/Value.html" title="class in net.jxta.impl.xindice.core.data">Value</A>&nbsp;value,
                     long&nbsp;pointer)
              throws java.io.IOException,
                     <A HREF="../../../../../../net/jxta/impl/xindice/core/filer/BTreeException.html" title="class in net.jxta.impl.xindice.core.filer">BTreeException</A></PRE>
<DL>
<DD>addValue adds a Value to the BTree and associates a pointer with
 it.  The pointer can be used for referencing any type of data, it
 just so happens that Xindice uses it for referencing pages of
 associated data in the BTree file or other files.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>root</CODE> - The BTree's root information (for nested trees)<DD><CODE>value</CODE> - The Value to add<DD><CODE>pointer</CODE> - The pointer to associate with it
<DT><B>Returns:</B><DD>The previous value for the pointer (or -1)
<DT><B>Throws:</B>
<DD><CODE>java.io.IOException</CODE>