aggregation.html
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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>Aggregation (Mondrian OLAP Server, version 3.0.4.11371)</TITLE><META NAME="keywords" CONTENT="mondrian.rolap.agg.Aggregation class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="Aggregation (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/AggQuerySpec.html" title="class in mondrian.rolap.agg"><B>PREV CLASS</B></A> <A HREF="../../../mondrian/rolap/agg/Aggregation.Axis.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/Aggregation.html" target="_top"><B>FRAMES</B></A> <A HREF="Aggregation.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> | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <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 Aggregation</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.Aggregation</B></PRE><HR><DL><DT><PRE>public class <B>Aggregation</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>Aggregation</code> is a pre-computed aggregation over a set of columns. <p>Rollup operations:<ul> <li>drop an unrestricted column (e.g. state=*)</li> <li>tighten any restriction (e.g. year={1997,1998} becomes year={1997})</li> <li>restrict an unrestricted column (e.g. year=* becomes year={1997})</li> </ul> <p>Representation of aggregations. Sparse and dense representations are necessary for different data sets. Should adapt automatically. Use an interface to hold the data set, so the segment doesn't care.</p> Suppose we have a segment {year=1997, quarter={1,2,3}, state={CA,WA}}. We want to roll up to a segment for {year=1997, state={CA,WA}}. We need to know that we have all quarters. We don't. Because year and quarter are independent, we know that we have all of the ...</p> <p>Suppose we have a segment specified by {region=West, state=*, year=*}, which materializes to ({West}, {CA,WA,OR}, {1997,1998}). Because state=*, we can rollup to {region=West, year=*} or {region=West, year=1997}.</p> <p>The space required for a segment depends upon the dimensionality (d), cell count (c) and the value count (v). We don't count the space required for the actual values, which is the same in any scheme.</p><P><P><DL><DT><B>Since:</B></DT> <DD>28 August, 2001</DD><DT><B>Version:</B></DT> <DD>$Id: //open/mondrian-release/3.0/src/main/mondrian/rolap/agg/Aggregation.java#3 $</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/Aggregation.Axis.html" title="class in mondrian.rolap.agg">Aggregation.Axis</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/Aggregation.html#Aggregation(mondrian.rolap.agg.AggregationKey)">Aggregation</A></B>(<A HREF="../../../mondrian/rolap/agg/AggregationKey.html" title="class in mondrian.rolap.agg">AggregationKey</A> aggregationKey)</CODE><BR> Creates an Aggregation.</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"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Method Summary</B></FONT></TH></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="../../../mondrian/rolap/agg/Aggregation.html#flush(mondrian.olap.CacheControl, mondrian.rolap.RolapCacheRegion)">flush</A></B>(<A HREF="../../../mondrian/olap/CacheControl.html" title="interface in mondrian.olap">CacheControl</A> cacheControl, <A HREF="../../../mondrian/rolap/RolapCacheRegion.html" title="class in mondrian.rolap">RolapCacheRegion</A> cacheRegion)</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../mondrian/rolap/agg/Aggregation.html#getCellValue(mondrian.rolap.RolapStar.Measure, java.lang.Object[], mondrian.rolap.RolapAggregationManager.PinSet)">getCellValue</A></B>(<A HREF="../../../mondrian/rolap/RolapStar.Measure.html" title="class in mondrian.rolap">RolapStar.Measure</A> measure, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>[] keys, <A HREF="../../../mondrian/rolap/RolapAggregationManager.PinSet.html" title="interface in mondrian.rolap">RolapAggregationManager.PinSet</A> pinSet)</CODE><BR> Retrieves the value identified by <code>keys</code>.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../mondrian/rolap/RolapStar.Column.html" title="class in mondrian.rolap">RolapStar.Column</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../mondrian/rolap/agg/Aggregation.html#getColumns()">getColumns</A></B>()</CODE><BR> This is called during Sql generation.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../mondrian/rolap/BitKey.html" title="interface in mondrian.rolap">BitKey</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../mondrian/rolap/agg/Aggregation.html#getConstrainedColumnsBitKey()">getConstrainedColumnsBitKey</A></B>()</CODE><BR> Returns the BitKey for ALL columns (Measures and Levels) involved in the query.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/javase/6/docs/api/java/util/Date.html" title="class or interface in java.util">Date</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../mondrian/rolap/agg/Aggregation.html#getCreationTimestamp()">getCreationTimestamp</A></B>()</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../mondrian/rolap/RolapStar.html" title="class in mondrian.rolap">RolapStar</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../mondrian/rolap/agg/Aggregation.html#getStar()">getStar</A></B>()</CODE><BR> This is called during Sql generation.</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="../../../mondrian/rolap/agg/Aggregation.html#load(mondrian.rolap.RolapStar.Column[], mondrian.rolap.RolapStar.Measure[], mondrian.rolap.StarColumnPredicate[], mondrian.rolap.RolapAggregationManager.PinSet, mondrian.rolap.GroupingSetsCollector)">load</A></B>(<A HREF="../../../mondrian/rolap/RolapStar.Column.html" title="class in mondrian.rolap">RolapStar.Column</A>[] columns, <A HREF="../../../mondrian/rolap/RolapStar.Measure.html" title="class in mondrian.rolap">RolapStar.Measure</A>[] measures, <A HREF="../../../mondrian/rolap/StarColumnPredicate.html" title="interface in mondrian.rolap">StarColumnPredicate</A>[] predicates, <A HREF="../../../mondrian/rolap/RolapAggregationManager.PinSet.html" title="interface in mondrian.rolap">RolapAggregationManager.PinSet</A> pinnedSegments, <A HREF="../../../mondrian/rolap/GroupingSetsCollector.html" title="class in mondrian.rolap">GroupingSetsCollector</A> groupingSetsCollector)</CODE><BR> Loads a set of segments into this aggregation, one per measure, each constrained by the same set of column values, and each pinned once.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../mondrian/rolap/StarColumnPredicate.html" title="interface in mondrian.rolap">StarColumnPredicate</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../mondrian/rolap/agg/Aggregation.html#optimizePredicates(mondrian.rolap.RolapStar.Column[], mondrian.rolap.StarColumnPredicate[])">optimizePredicates</A></B>(<A HREF="../../../mondrian/rolap/RolapStar.Column.html" title="class in mondrian.rolap">RolapStar.Column</A>[] columns, <A HREF="../../../mondrian/rolap/StarColumnPredicate.html" title="interface in mondrian.rolap">StarColumnPredicate</A>[] predicates)</CODE><BR> Drops predicates, where the list of values is close to the values which would be returned anyway.</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="../../../mondrian/rolap/agg/Aggregation.html#print(java.io.PrintWriter)">print</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/PrintWriter.html" title="class or interface in java.io">PrintWriter</A> pw)</CODE><BR> Prints the state of this <code>Aggregation</code> to a writer.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../mondrian/rolap/agg/Aggregation.html#toString()">toString</A></B>()</CODE>⌨️ 快捷键说明
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