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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>Expr (Geotools 2.3.x 2.3.2 API)</TITLE><META NAME="keywords" CONTENT="org.geotools.filter.Expr class"><META NAME="keywords" CONTENT="and()"><META NAME="keywords" CONTENT="or()"><META NAME="keywords" CONTENT="not()"><META NAME="keywords" CONTENT="featureId()"><META NAME="keywords" CONTENT="property()"><META NAME="keywords" CONTENT="between()"><META NAME="keywords" CONTENT="equals()"><META NAME="keywords" CONTENT="notEqual()"><META NAME="keywords" CONTENT="greater()"><META NAME="keywords" CONTENT="greaterOrEqual()"><META NAME="keywords" CONTENT="less()"><META NAME="keywords" CONTENT="lessOrEqual()"><META NAME="keywords" CONTENT="like()"><META NAME="keywords" CONTENT="isNull()"><META NAME="keywords" CONTENT="bbox()"><META NAME="keywords" CONTENT="beyond()"><META NAME="keywords" CONTENT="contains()"><META NAME="keywords" CONTENT="crosses()"><META NAME="keywords" CONTENT="disjoint()"><META NAME="keywords" CONTENT="dwithin()"><META NAME="keywords" CONTENT="equal()"><META NAME="keywords" CONTENT="intersects()"><META NAME="keywords" CONTENT="overlaps()"><META NAME="keywords" CONTENT="touches()"><META NAME="keywords" CONTENT="within()"><META NAME="keywords" CONTENT="add()"><META NAME="keywords" CONTENT="divide()"><META NAME="keywords" CONTENT="multiply()"><META NAME="keywords" CONTENT="subtract()"><META NAME="keywords" CONTENT="function()"><META NAME="keywords" CONTENT="literal()"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="Expr (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/Expr.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/DefaultExpression.html" title="class in org.geotools.filter"><B>PREV CLASS</B></A> <A HREF="../../../org/geotools/filter/ExpressionBuilder.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="Expr.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 | 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">org.geotools.filter</FONT><BR>Class Expr</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"><B>Expr</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../org/geotools/factory/Factory.html" title="interface in org.geotools.factory">Factory</A>, <A HREF="../../../org/geotools/filter/FilterFactory.html" title="interface in org.geotools.filter">FilterFactory</A>, FilterFactory</DD></DL><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../org/geotools/filter/FilterFactoryImpl.html" title="class in org.geotools.filter">FilterFactoryImpl</A></DD></DL><HR><DL><DT>public abstract class <B>Expr</B><DT>extends <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../../org/geotools/filter/FilterFactory.html" title="interface in org.geotools.filter">FilterFactory</A></DL><P>This is FilterFactory for a very interesting implementation of Filter / Expression. <p> Here is what Expr is all about: <ul> <li>method compatability with geoapi Filter / Expression interfaces <li>true geoapi compatability as we transition to a common Feature and Geometry model <li>compatability with with 2.1 FeatureType and JTS Geometry <li>compatability (or known converstion) to 2.1 Filter / Expression interfaces <li>chaining for ease of use </ul> <p> This will make user of Java 5 type narrowing (so the FilterFactory methods will return subtypes of Expr). </p> <p> Note: FilterExpr is considered a normal Expr in which the result is known to be<b>boolean</b>. </p> <p> This method also implements the "chaining" concept you see in the collections lib. This allows you to chain together a series of method calls to build up your expression on a single line of java code. </p> <p> From a modeling standpoint the chaining idea is incidental (it adds no expressive power), it is simply a convience to users. It is also the motivation for Expr being both an abstract class and Factory. </p><P><P><DL><DT><B>Author:</B></DT> <DD>Jody Garnett</DD></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== 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/Expr.html#Expr()">Expr</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> Add</CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/Expr.html#add(org.opengis.filter.expression.Expression, org.opengis.filter.expression.Expression)">add</A></B>(Expression expr1, Expression expr2)</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> And</CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/Expr.html#and(org.opengis.filter.Filter, org.opengis.filter.Filter)">and</A></B>(Filter f, Filter g)</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> And</CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/Expr.html#and(java.util.List)">and</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/List.html" title="class or interface in java.util">List</A> filters)</CODE><BR> </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> BBOX</CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/Expr.html#bbox(org.opengis.filter.expression.Expression, double, double, double, double, java.lang.String)">bbox</A></B>(Expression e, double minx, double miny, double maxx, double maxy, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> srs)</CODE><BR> Checks if the geometry expression overlaps the specified bounding box.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> BBOX</CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/Expr.html#bbox(java.lang.String, double, double, double, double, java.lang.String)">bbox</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> propertyName, double minx, double miny, double maxx, double maxy, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> srs)</CODE><BR> Checks if the bounding box of the feature's geometry overlaps the specified bounding box. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> PropertyIsBetween</CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/filter/Expr.html#between(org.opengis.filter.expression.Expression, org.opengis.filter.expression.Expression, org.opengis.filter.expression.Expression)">between</A></B>(Expression expr, Expression lower, Expression upper)</CODE><BR>⌨️ 快捷键说明
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