expression.html

Geotools是一个开源的Java GIS工具包,可利用它来开发符合标准的地理信息系统。Geotools提供了OGC(Open Geospatial Consortium)规范的一个实现来作为他们的

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<TD><CODE><B><A HREF="../../../../org/geotools/feature/visitor/MaxVisitor.html#MaxVisitor(org.geotools.filter.Expression)">MaxVisitor</A></B>(<A HREF="../../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A>&nbsp;expr)</CODE>

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<TD><CODE><B><A HREF="../../../../org/geotools/feature/visitor/UniqueVisitor.html#UniqueVisitor(org.geotools.filter.Expression)">UniqueVisitor</A></B>(<A HREF="../../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A>&nbsp;expr)</CODE>

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<TD><CODE><B><A HREF="../../../../org/geotools/feature/visitor/SumVisitor.html#SumVisitor(org.geotools.filter.Expression)">SumVisitor</A></B>(<A HREF="../../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A>&nbsp;expr)</CODE>

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<TD><CODE><B><A HREF="../../../../org/geotools/feature/visitor/QuantileListVisitor.html#QuantileListVisitor(org.geotools.filter.Expression, int)">QuantileListVisitor</A></B>(<A HREF="../../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A>&nbsp;expr,
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<TD><CODE><B><A HREF="../../../../org/geotools/feature/visitor/AverageVisitor.html#AverageVisitor(org.geotools.filter.Expression)">AverageVisitor</A></B>(<A HREF="../../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A>&nbsp;expr)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Constructor class for the AverageVisitor using an expression</TD>
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<TD><CODE><B><A HREF="../../../../org/geotools/feature/visitor/MedianVisitor.html#MedianVisitor(org.geotools.filter.Expression)">MedianVisitor</A></B>(<A HREF="../../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A>&nbsp;expr)</CODE>

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<TD><CODE><B><A HREF="../../../../org/geotools/feature/visitor/MinVisitor.html#MinVisitor(org.geotools.filter.Expression)">MinVisitor</A></B>(<A HREF="../../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A>&nbsp;expr)</CODE>

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<A NAME="org.geotools.filter"><!-- --></A>
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Uses of <A HREF="../../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A> in <A HREF="../../../../org/geotools/filter/package-summary.html">org.geotools.filter</A></FONT></TD>
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<TD COLSPAN=2>Subinterfaces of <A HREF="../../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A> in <A HREF="../../../../org/geotools/filter/package-summary.html">org.geotools.filter</A></FONT></TD>
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<CODE>&nbsp;interface</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/AttributeExpression.html" title="interface in org.geotools.filter">AttributeExpression</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;<I>use <CODE>PropertyName</CODE></I></TD>
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<CODE>&nbsp;interface</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/BBoxExpression.html" title="interface in org.geotools.filter">BBoxExpression</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A convenience expression to form a geometry literal from an  envelope.</TD>
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<CODE>&nbsp;interface</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/EnvironmentVariable.html" title="interface in org.geotools.filter">EnvironmentVariable</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DOCUMENT ME!</TD>
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<CODE>&nbsp;interface</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/FunctionExpression.html" title="interface in org.geotools.filter">FunctionExpression</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;<I>use <CODE>Function</CODE></I></TD>
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<CODE>&nbsp;interface</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/LiteralExpression.html" title="interface in org.geotools.filter">LiteralExpression</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;<I>use <CODE>Literal</CODE></I></TD>
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<CODE>&nbsp;interface</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/MapScaleDenominator.html" title="interface in org.geotools.filter">MapScaleDenominator</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DOCUMENT ME!</TD>
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<CODE>&nbsp;interface</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/MathExpression.html" title="interface in org.geotools.filter">MathExpression</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>Deprecated.</B>&nbsp;<I>use <CODE>BinaryExpression</CODE></I></TD>
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<TD COLSPAN=2>Classes in <A HREF="../../../../org/geotools/filter/package-summary.html">org.geotools.filter</A> that implement <A HREF="../../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A></FONT></TD>
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<CODE>&nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/AreaFunction.html" title="class in org.geotools.filter">AreaFunction</A></B></CODE>

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<CODE>&nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/AttributeExpressionImpl.html" title="class in org.geotools.filter">AttributeExpressionImpl</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Defines a complex filter (could also be called logical filter). </TD>
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<CODE>&nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/AttributeExpressionImpl2.html" title="class in org.geotools.filter">AttributeExpressionImpl2</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Defines a complex filter (could also be called logical filter). </TD>
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<CODE>&nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/BBoxExpressionImpl.html" title="class in org.geotools.filter">BBoxExpressionImpl</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Implements a Bounding Box expression.</TD>
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<CODE>&nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/ConstantExpression.html" title="class in org.geotools.filter">ConstantExpression</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Expression class is not immutable!
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<CODE>&nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/DefaultExpression.html" title="class in org.geotools.filter">DefaultExpression</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Implements a default expression, with helpful variables and static methods.</TD>
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<CODE>&nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/FunctionExpressionImpl.html" title="class in org.geotools.filter">FunctionExpressionImpl</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Abstract class for a function expression implementation</TD>
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<CODE>&nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/GeometryExpressionImpl.html" title="class in org.geotools.filter">GeometryExpressionImpl</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Defines a complex filter (could also be called logical filter). </TD>
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<CODE>&nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/LengthFunction.html" title="class in org.geotools.filter">LengthFunction</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Takes an AttributeExpression, and computes the length of the data for the attribute.</TD>
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<CODE>&nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/LiteralExpressionImpl.html" title="class in org.geotools.filter">LiteralExpressionImpl</A></B></CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Defines an expression that holds a literal for return.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;class</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/filter/MapScaleDenominatorImpl.html" title="class in org.geotools.filter">MapScaleDenominatorImpl</A></B></CODE>

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