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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_15) on Thu Jul 31 17:20:36 EDT 2008 --><TITLE>Segment (Mondrian OLAP Server, version 3.0.4.11371)</TITLE><META NAME="keywords" CONTENT="mondrian.rolap.agg.Segment class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="Segment (Mondrian OLAP Server, version 3.0.4.11371)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../mondrian/rolap/agg/RangeColumnPredicate.html" title="class in mondrian.rolap.agg"><B>PREV CLASS</B></A> <A HREF="../../../mondrian/rolap/agg/Segment.Region.html" title="class in mondrian.rolap.agg"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html?mondrian/rolap/agg/Segment.html" target="_top"><B>FRAMES</B></A> <A HREF="Segment.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: <A HREF="#nested_class_summary">NESTED</A> | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">mondrian.rolap.agg</FONT><BR>Class Segment</H2><PRE><A HREF="http://java.sun.com/javase/6/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>mondrian.rolap.agg.Segment</B></PRE><HR><DL><DT><PRE> class <B>Segment</B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></DL></PRE><P>A <code>Segment</code> is a collection of cell values parameterized by a measure, and a set of (column, value) pairs. An example of a segment is</p> <blockquote> <p>(Unit sales, Gender = 'F', State in {'CA','OR'}, Marital Status = <i> anything</i>)</p> </blockquote> <p>All segments over the same set of columns belong to an Aggregation, in this case</p> <blockquote> <p>('Sales' Star, Gender, State, Marital Status)</p> </blockquote> <p>Note that different measures (in the same Star) occupy the same Aggregation. Aggregations belong to the AggregationManager, a singleton.</p> <p>Segments are pinned during the evaluation of a single MDX query. The query evaluates the expressions twice. The first pass, it finds which cell values it needs, pins the segments containing the ones which are already present (one pin-count for each cell value used), and builds a <A HREF="../../../mondrian/rolap/agg/CellRequest.html" title="class in mondrian.rolap.agg"><CODE>cell request</CODE></A> for those which are not present. It executes the cell request to bring the required cell values into the cache, again, pinned. Then it evalutes the query a second time, knowing that all cell values are available. Finally, it releases the pins.</p> <p>A Segment may have a list of excluded <A HREF="../../../mondrian/rolap/agg/Segment.Region.html" title="class in mondrian.rolap.agg"><CODE>Segment.Region</CODE></A> objects. These are caused by cache flushing. Usually a segment is a hypercube: it is defined by a set of values on each of its axes. But after a cache flush request, a segment may have a rectangular 'hole', and therefore not be a hypercube anymore. <p>For example, the segment defined by {CA, OR, WA} * {F, M} is a 2-dimensional hyper-rectangle with 6 cells. After flushing {CA, OR, TX} * {F}, the result is 4 cells: <pre> F M CA out in OR out in WA in in </pre> defined by the original segment minus the region ({CA, OR} * {F}).<P><P><DL><DT><B>Since:</B></DT> <DD>21 March, 2002</DD><DT><B>Version:</B></DT> <DD>$Id: //open/mondrian-release/3.0/src/main/mondrian/rolap/agg/Segment.java#2 $</DD><DT><B>Author:</B></DT> <DD>jhyde</DD></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><A NAME="nested_class_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Nested Class Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>(package private) static class</CODE></FONT></TD><TD><CODE><B><A HREF="../../../mondrian/rolap/agg/Segment.Region.html" title="class in mondrian.rolap.agg">Segment.Region</A></B></CODE><BR> Definition of a region of values which are not in a segment.</TD></TR></TABLE> <!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Field Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>(package private) <A HREF="../../../mondrian/rolap/agg/Aggregation.html" title="class in mondrian.rolap.agg">Aggregation</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../mondrian/rolap/agg/Segment.html#aggregation">aggregation</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>(package private) <A HREF="../../../mondrian/rolap/agg/Aggregation.Axis.html" title="class in mondrian.rolap.agg">Aggregation.Axis</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../mondrian/rolap/agg/Segment.html#axes">axes</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>(package private) int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../mondrian/rolap/agg/Segment.html#id">id</A></B></CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>(package private) <A HREF="../../../mondrian/rolap/RolapStar.Measure.html" title="class in mondrian.rolap">RolapStar.Measure</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../mondrian/rolap/agg/Segment.html#measure">measure</A></B></CODE><BR> </TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../mondrian/rolap/agg/Segment.html#Segment(mondrian.rolap.agg.Aggregation, mondrian.rolap.RolapStar.Measure, mondrian.rolap.agg.Aggregation.Axis[], java.util.List)">Segment</A></B>(<A HREF="../../../mondrian/rolap/agg/Aggregation.html" title="class in mondrian.rolap.agg">Aggregation</A> aggregation, <A HREF="../../../mondrian/rolap/RolapStar.Measure.html" title="class in mondrian.rolap">RolapStar.Measure</A> measure, <A HREF="../../../mondrian/rolap/agg/Aggregation.Axis.html" title="class in mondrian.rolap.agg">Aggregation.Axis</A>[] axes, <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html" title="class or interface in java.util">List</A><<A HREF="../../../mondrian/rolap/agg/Segment.Region.html" title="class in mondrian.rolap.agg">Segment.Region</A>> excludedRegions)</CODE><BR> Creates a <code>Segment</code>; it's not loaded yet.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">⌨️ 快捷键说明
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