filterabstract.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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<A NAME="FilterAbstract(org.geotools.filter.FilterFactory)"><!-- --></A><H3>
FilterAbstract</H3>
<PRE>
protected <B>FilterAbstract</B>(<A HREF="../../../org/geotools/filter/FilterFactory.html" title="interface in org.geotools.filter">FilterFactory</A>&nbsp;factory)</PRE>
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<DT><B>Parameters:</B><DD><CODE>factory</CODE> - FilterFactory injected into the filter.</DL>

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<A NAME="evaluate(org.geotools.feature.Feature)"><!-- --></A><H3>
evaluate</H3>
<PRE>
public boolean <B>evaluate</B>(<A HREF="../../../org/geotools/feature/Feature.html" title="interface in org.geotools.feature">Feature</A>&nbsp;feature)</PRE>
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<DD>Subclass should overrride.
 
 Default value is false
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<A NAME="evaluate(java.lang.Object)"><!-- --></A><H3>
evaluate</H3>
<PRE>
public boolean <B>evaluate</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>&nbsp;object)</PRE>
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<DD>Subclass should overrride.

 Default value is false
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<DT><B>Specified by:</B><DD><CODE>evaluate</CODE> in interface <CODE>Filter</CODE></DL>
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<A NAME="accepts(org.geotools.feature.Feature)"><!-- --></A><H3>
accepts</H3>
<PRE>
public boolean <B>accepts</B>(<A HREF="../../../org/geotools/feature/Feature.html" title="interface in org.geotools.feature">Feature</A>&nbsp;feature)</PRE>
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<DD>Straight call throught to: evaulate( feature )
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<A NAME="accept(org.opengis.filter.FilterVisitor, java.lang.Object)"><!-- --></A><H3>
accept</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <B>accept</B>(FilterVisitor&nbsp;visitor,
                     <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;extraData)</PRE>
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<DD>Subclass should override, default implementation just returns extraData
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<DD><DL>
<DT><B>Specified by:</B><DD><CODE>accept</CODE> in interface <CODE>Filter</CODE></DL>
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<A NAME="eval(org.geotools.filter.Expression, org.geotools.feature.Feature)"><!-- --></A><H3>
eval</H3>
<PRE>
protected <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <B>eval</B>(<A HREF="../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A>&nbsp;expression,
                      <A HREF="../../../org/geotools/feature/Feature.html" title="interface in org.geotools.feature">Feature</A>&nbsp;feature)</PRE>
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<DD>Helper method for subclasses to reduce null checks
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<DT><B>Parameters:</B><DD><CODE>expression</CODE> - <DD><CODE>feature</CODE> - 
<DT><B>Returns:</B><DD>value or null</DL>
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<A NAME="eval(org.opengis.filter.expression.Expression, java.lang.Object)"><!-- --></A><H3>
eval</H3>
<PRE>
protected <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <B>eval</B>(Expression&nbsp;expression,
                      <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;object)</PRE>
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<DD>Helper method for subclasses to reduce null checks
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<DT><B>Parameters:</B><DD><CODE>expression</CODE> - <DD><CODE>object</CODE> - 
<DT><B>Returns:</B><DD>value or null</DL>
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<A NAME="comparable(org.opengis.filter.expression.Expression, org.geotools.feature.Feature)"><!-- --></A><H3>
comparable</H3>
<PRE>
protected <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Comparable.html" title="class or interface in java.lang">Comparable</A> <B>comparable</B>(Expression&nbsp;expr,
                                <A HREF="../../../org/geotools/feature/Feature.html" title="interface in org.geotools.feature">Feature</A>&nbsp;feature)</PRE>
<DL>
<DD>Subclass convenience method for turning an expression + feature into something
 comparable.
 <p>
 If the result of the expression is something that implements 
 <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Comparable.html" title="class or interface in java.lang"><CODE>Comparable</CODE></A> it is returned directly, otherwise the 
 object is transformed to a string and returned.
 </p>
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<DT><B>Parameters:</B><DD><CODE>expr</CODE> - The expression<DD><CODE>feature</CODE> - The feature.
<DT><B>Returns:</B><DD>Something comparable.</DL>
</DD>
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