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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 11:36:26 GMT-05:00 2007 --><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><TITLE>DefaultExpression (Geotools 2.3.x 2.3.2 API)</TITLE><META NAME="keywords" CONTENT="org.geotools.filter.DefaultExpression class"><META NAME="keywords" CONTENT="expressionType"><META NAME="keywords" CONTENT="permissiveConstruction"><META NAME="keywords" CONTENT="getType()"><META NAME="keywords" CONTENT="getValue()"><META NAME="keywords" CONTENT="evaluate()"><META NAME="keywords" CONTENT="accept()"><META NAME="keywords" CONTENT="isAttributeExpression()"><META NAME="keywords" CONTENT="isMathExpression()"><META NAME="keywords" CONTENT="isLiteralExpression()"><META NAME="keywords" CONTENT="isGeometryExpression()"><META NAME="keywords" CONTENT="isExpression()"><META NAME="keywords" CONTENT="isFunctionExpression()"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="DefaultExpression (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/DefaultExpression.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/ConstantExpression.html" title="class in org.geotools.filter"><B>PREV CLASS</B></A> <A HREF="../../../org/geotools/filter/Expr.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="DefaultExpression.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="#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">org.geotools.filter</FONT><BR>Class DefaultExpression</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"><B>DefaultExpression</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD>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></DD></DL><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../org/geotools/filter/AttributeExpressionImpl.html" title="class in org.geotools.filter">AttributeExpressionImpl</A>, <A HREF="../../../org/geotools/filter/AttributeExpressionImpl2.html" title="class in org.geotools.filter">AttributeExpressionImpl2</A>, <A HREF="../../../org/geotools/filter/FunctionExpressionImpl.html" title="class in org.geotools.filter">FunctionExpressionImpl</A>, <A HREF="../../../org/geotools/filter/GeometryExpressionImpl.html" title="class in org.geotools.filter">GeometryExpressionImpl</A>, <A HREF="../../../org/geotools/filter/LiteralExpressionImpl.html" title="class in org.geotools.filter">LiteralExpressionImpl</A>, <A HREF="../../../org/geotools/filter/MapScaleDenominatorImpl.html" title="class in org.geotools.filter">MapScaleDenominatorImpl</A>, <A HREF="../../../org/geotools/filter/MathExpressionImpl.html" title="class in org.geotools.filter">MathExpressionImpl</A></DD></DL><HR><DL><DT>public abstract class <B>DefaultExpression</B><DT>extends <A HREF="../../../org/geotools/filter/expression/ExpressionAbstract.html" title="class in org.geotools.filter.expression">ExpressionAbstract</A><DT>implements <A HREF="../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A></DL><P>Implements a default expression, with helpful variables and static methods.<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/DefaultExpression.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><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected short</CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/DefaultExpression.html#expressionType">expressionType</A></B></CODE><BR> Defines the type of this expression.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/DefaultExpression.html#permissiveConstruction">permissiveConstruction</A></B></CODE><BR> Defines the type of this expression.</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><CODE><B><A HREF="../../../org/geotools/filter/DefaultExpression.html#DefaultExpression()">DefaultExpression</A></B>()</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/DefaultExpression.html#accept(org.geotools.filter.FilterVisitor)">accept</A></B>(<A HREF="../../../org/geotools/filter/FilterVisitor.html" title="interface in org.geotools.filter">FilterVisitor</A> visitor)</CODE><BR> Used by FilterVisitors to perform some action on this filter instance. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/DefaultExpression.html#evaluate(org.geotools.feature.Feature)">evaluate</A></B>(<A HREF="../../../org/geotools/feature/Feature.html" title="interface in org.geotools.feature">Feature</A> feature)</CODE><BR> Returns a value for this expression. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/DefaultExpression.html#evaluate(java.lang.Object)">evaluate</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> object)</CODE><BR> This method checks if the object is an instance of <A HREF="../../../org/geotools/feature/Feature.html" title="interface in org.geotools.feature"><CODE>Feature</CODE></A> and if so, calls through to <A HREF="../../../org/geotools/filter/DefaultExpression.html#evaluate(org.geotools.feature.Feature)"><CODE>evaluate(Feature)</CODE></A>. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> short</CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/DefaultExpression.html#getType()">getType</A></B>()</CODE>⌨️ 快捷键说明
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