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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 1.4.2_13) on Tue Jun 05 11:36:27 GMT-05:00 2007 --><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><TITLE>MathExpressionImpl (Geotools 2.3.x 2.3.2 API)</TITLE><META NAME="keywords" CONTENT="org.geotools.filter.MathExpressionImpl class"><META NAME="keywords" CONTENT="addLeftValue()"><META NAME="keywords" CONTENT="addRightValue()"><META NAME="keywords" CONTENT="getLeftValue()"><META NAME="keywords" CONTENT="getExpression1()"><META NAME="keywords" CONTENT="setExpression1()"><META NAME="keywords" CONTENT="getRightValue()"><META NAME="keywords" CONTENT="getExpression2()"><META NAME="keywords" CONTENT="setExpression2()"><META NAME="keywords" CONTENT="getType()"><META NAME="keywords" CONTENT="evaluate()"><META NAME="keywords" CONTENT="ensureOperandsSet()"><META NAME="keywords" CONTENT="number()"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="MathExpressionImpl (Geotools 2.3.x 2.3.2 API)";}</SCRIPT></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=3 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="class-use/MathExpressionImpl.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </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="../../../org/geotools/filter/MapScaleDenominatorImpl.html" title="class in org.geotools.filter"><B>PREV CLASS</B></A> <A HREF="../../../org/geotools/filter/MaxFunction.html" title="class in org.geotools.filter"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="MathExpressionImpl.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: NESTED | <A HREF="#fields_inherited_from_class_DefaultExpression">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: 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">org.geotools.filter</FONT><BR>Class MathExpressionImpl</H2><PRE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../org/geotools/filter/expression/ExpressionAbstract.html" title="class in org.geotools.filter.expression">ExpressionAbstract</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../org/geotools/filter/DefaultExpression.html" title="class in org.geotools.filter">DefaultExpression</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by"><B>MathExpressionImpl</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>BinaryExpression, Expression, <A HREF="../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html" title="interface in org.geotools.filter">ExpressionType</A>, <A HREF="../../../org/geotools/filter/MathExpression.html" title="interface in org.geotools.filter">MathExpression</A></DD></DL><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../org/geotools/filter/expression/AddImpl.html" title="class in org.geotools.filter.expression">AddImpl</A>, <A HREF="../../../org/geotools/filter/expression/DivideImpl.html" title="class in org.geotools.filter.expression">DivideImpl</A>, <A HREF="../../../org/geotools/filter/expression/MultiplyImpl.html" title="class in org.geotools.filter.expression">MultiplyImpl</A>, <A HREF="../../../org/geotools/filter/expression/SubtractImpl.html" title="class in org.geotools.filter.expression">SubtractImpl</A></DD></DL><HR><DL><DT>public abstract class <B>MathExpressionImpl</B><DT>extends <A HREF="../../../org/geotools/filter/DefaultExpression.html" title="class in org.geotools.filter">DefaultExpression</A><DT>implements <A HREF="../../../org/geotools/filter/MathExpression.html" title="interface in org.geotools.filter">MathExpression</A></DL><P>Holds a mathematical relationship between two expressions. Note that the sub expressions must be math expressions. In other words, they must be a math literal, another math expression, or a feature attribute with a declared math type. You may create math expressions of arbitrary complexity by nesting other math expressions as sub expressions in one or more math expressions. This filter defines left and right values to clarify the sub expression precedence for non-associative operations, such as subtraction and division. For example, the left value is the numerator and the right is the denominator in an ExpressionMath division operation.<P><P><DL><DT><B>Author:</B></DT> <DD>Rob Hranac, Vision for New York</DD><DT><B>Module:</B></DT><DD><CODE><B>module/main</B></CODE> (<A HREF="http://maven.geotools.fr/repository/org/geotools/gt2-main/"><CODE>gt2-main.jar</CODE></A>) (<A HREF="http://maven.geotools.fr/reports/main/index.html">Maven report</A>) (<A HREF="http://svn.geotools.org/geotools/tags/2.3.2/module/main/src/org/geotools/filter/MathExpressionImpl.java">SVN head</A>)</DD></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR></TABLE> <A NAME="fields_inherited_from_class_DefaultExpression"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class <A HREF="../../../org/geotools/filter/DefaultExpression.html" title="class in org.geotools.filter">DefaultExpression</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../org/geotools/filter/DefaultExpression.html#expressionType">expressionType</A>, <A HREF="../../../org/geotools/filter/DefaultExpression.html#permissiveConstruction">permissiveConstruction</A></CODE></TD></TR></TABLE> <A NAME="fields_inherited_from_class_ExpressionType"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface <A HREF="../../../org/geotools/filter/ExpressionType.html" title="interface in org.geotools.filter">ExpressionType</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../org/geotools/filter/ExpressionType.html#ATTRIBUTE">ATTRIBUTE</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#ATTRIBUTE_DOUBLE">ATTRIBUTE_DOUBLE</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#ATTRIBUTE_GEOMETRY">ATTRIBUTE_GEOMETRY</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#ATTRIBUTE_INTEGER">ATTRIBUTE_INTEGER</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#ATTRIBUTE_STRING">ATTRIBUTE_STRING</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#ATTRIBUTE_UNDECLARED">ATTRIBUTE_UNDECLARED</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#FUNCTION">FUNCTION</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#LITERAL_BOOLEAN">LITERAL_BOOLEAN</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#LITERAL_DATE">LITERAL_DATE</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#LITERAL_DOUBLE">LITERAL_DOUBLE</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#LITERAL_GEOMETRY">LITERAL_GEOMETRY</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#LITERAL_INTEGER">LITERAL_INTEGER</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#LITERAL_LONG">LITERAL_LONG</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#LITERAL_STRING">LITERAL_STRING</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#MATH_ADD">MATH_ADD</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#MATH_DIVIDE">MATH_DIVIDE</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#MATH_MULTIPLY">MATH_MULTIPLY</A>, <A HREF="../../../org/geotools/filter/ExpressionType.html#MATH_SUBTRACT">MATH_SUBTRACT</A></CODE></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"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected </CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/MathExpressionImpl.html#MathExpressionImpl()">MathExpressionImpl</A></B>()</CODE><BR> No argument constructor.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected </CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/MathExpressionImpl.html#MathExpressionImpl(org.opengis.filter.expression.Expression, org.opengis.filter.expression.Expression)">MathExpressionImpl</A></B>(Expression e1, Expression e2)</CODE><BR> </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"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></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="../../../org/geotools/filter/MathExpressionImpl.html#addLeftValue(org.geotools.filter.Expression)">addLeftValue</A></B>(<A HREF="../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A> leftValue)</CODE><BR> <B>Deprecated.</B> <I>use <A HREF="../../../org/geotools/filter/MathExpressionImpl.html#setExpression1(org.opengis.filter.expression.Expression)"><CODE>setExpression1(org.opengis.filter.expression.Expression)</CODE></A></I></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="../../../org/geotools/filter/MathExpressionImpl.html#addRightValue(org.geotools.filter.Expression)">addRightValue</A></B>(<A HREF="../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A> rightValue)</CODE><BR> <B>Deprecated.</B> <I>use <A HREF="../../../org/geotools/filter/MathExpressionImpl.html#setExpression2(org.opengis.filter.expression.Expression)"><CODE>setExpression2(org.opengis.filter.expression.Expression)</CODE></A></I></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/MathExpressionImpl.html#ensureOperandsSet()">ensureOperandsSet</A></B>()</CODE><BR> Convenience method which ensures that both expressions have been ⌨️ 快捷键说明
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