abstractcalc.html

来自「基于mondrian 开源框架进行OLAP多维分析」· HTML 代码 · 共 647 行 · 第 1/3 页

 Some examples:<ul>

 <li>The expression
 <blockquote><code>[Measures].[Unit Sales]</code></blockquote>
 depends on all dimensions except <code>[Measures]</code>.

 <li>The boolean expression
 <blockquote><code>([Measures].[Unit Sales],
 [Time].[1997]) &gt; 1000</code></blockquote>
 depends on all dimensions except [Measures] and [Time].

 <li>The list expression
 <blockquote><code>Filter([Store].[USA].Children,
 [Measures].[Unit Sales] &lt; 50)</code></pre></blockquote>
 depends upon all dimensions <em>except</em> [Store] and [Measures].
 How so? Normally the scalar expression would depend upon all dimensions
 except [Measures], but the <code>Filter</code> function sets the [Store]
 context before evaluating the scalar expression, so it is not inherited
 from the surrounding context.

 </ul><p/>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../mondrian/calc/Calc.html#dependsOn(mondrian.olap.Dimension)">dependsOn</A></CODE> in interface <CODE><A HREF="../../../mondrian/calc/Calc.html" title="interface in mondrian.calc">Calc</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dimension</CODE> - Dimension
<DT><B>Returns:</B><DD>Whether this expression's result depends upon the current member
   of the dimension</DL>
</DD>
</DL>
<HR>

<A NAME="anyDepends(mondrian.calc.Calc[], mondrian.olap.Dimension)"><!-- --></A><H3>
anyDepends</H3>
<PRE>
public static boolean <B>anyDepends</B>(<A HREF="../../../mondrian/calc/Calc.html" title="interface in mondrian.calc">Calc</A>[]&nbsp;calcs,
                                 <A HREF="../../../mondrian/olap/Dimension.html" title="interface in mondrian.olap">Dimension</A>&nbsp;dimension)</PRE>
<DL>
<DD>Returns true if one of the calcs depends on the given dimension.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="anyDependsButFirst(mondrian.calc.Calc[], mondrian.olap.Dimension)"><!-- --></A><H3>
anyDependsButFirst</H3>
<PRE>
public static boolean <B>anyDependsButFirst</B>(<A HREF="../../../mondrian/calc/Calc.html" title="interface in mondrian.calc">Calc</A>[]&nbsp;calcs,
                                         <A HREF="../../../mondrian/olap/Dimension.html" title="interface in mondrian.olap">Dimension</A>&nbsp;dimension)</PRE>
<DL>
<DD>Returns true if calc[0] depends on dimension,
 else false if calc[0] returns dimension,
 else true if any of the other calcs depend on dimension.

 <p>Typical application: <code>Aggregate({Set}, {Value Expression})</code>
 depends upon everything {Value Expression} depends upon, except the
 dimensions of {Set}.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="butDepends(mondrian.calc.Calc[], mondrian.olap.Dimension)"><!-- --></A><H3>
butDepends</H3>
<PRE>
public static boolean <B>butDepends</B>(<A HREF="../../../mondrian/calc/Calc.html" title="interface in mondrian.calc">Calc</A>[]&nbsp;calcs,
                                 <A HREF="../../../mondrian/olap/Dimension.html" title="interface in mondrian.olap">Dimension</A>&nbsp;dimension)</PRE>
<DL>
<DD>Returns true if any of the calcs depend on dimension,
 else false if any of the calcs return dimension,
 else true.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getArguments()"><!-- --></A><H3>
getArguments</H3>
<PRE>
public <A HREF="http://java.sun.com/javase/6/docs/api/java/util/List.html" title="class or interface in java.util">List</A>&lt;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&gt; <B>getArguments</B>()</PRE>
<DL>
<DD>Returns any other arguments to this calc.
 The default implementation returns the empty list.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="simplifyEvaluator(mondrian.calc.Calc, mondrian.olap.Evaluator)"><!-- --></A><H3>
simplifyEvaluator</H3>
<PRE>
public static <A HREF="../../../mondrian/olap/Evaluator.html" title="interface in mondrian.olap">Evaluator</A> <B>simplifyEvaluator</B>(<A HREF="../../../mondrian/calc/Calc.html" title="interface in mondrian.calc">Calc</A>&nbsp;calc,
                                          <A HREF="../../../mondrian/olap/Evaluator.html" title="interface in mondrian.olap">Evaluator</A>&nbsp;evaluator)</PRE>
<DL>
<DD>Returns a simplified evalator whose context is the same for every
 dimension which an expression depends on, and the default member for
 every dimension which it does not depend on.

 <p>The default member is often the 'all' member, so this evaluator is
 usually the most efficient context in which to evaluate the expression.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>calc</CODE> - <DD><CODE>evaluator</CODE> - </DL>
</DD>
</DL>
<HR>

<A NAME="getResultStyle()"><!-- --></A><H3>
getResultStyle</H3>
<PRE>
public <A HREF="../../../mondrian/calc/ResultStyle.html" title="enum in mondrian.calc">ResultStyle</A> <B>getResultStyle</B>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../mondrian/calc/Calc.html#getResultStyle()">Calc</A></CODE></B></DD>
<DD>Returns style in which the result of evaluating this expression is
 returned.

 <p>One application of this method is for the compiler to figure out
 whether the compiled expression is returning a mutable list. If a mutable
 list is required, the compiler can create a mutable copy.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../mondrian/calc/Calc.html#getResultStyle()">getResultStyle</A></CODE> in interface <CODE><A HREF="../../../mondrian/calc/Calc.html" title="interface in mondrian.calc">Calc</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>See Also:</B><DD><A HREF="../../../mondrian/calc/ExpCompiler.html#compileList(mondrian.olap.Exp, boolean)"><CODE>ExpCompiler.compileList(mondrian.olap.Exp, boolean)</CODE></A></DL>
</DD>
</DL>
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