geometryexpressionimpl.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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<CODE>&nbsp;<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/geotools/filter/GeometryExpressionImpl.html#toString()">toString</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return this expression as a string.</TD>
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&nbsp;<A NAME="methods_inherited_from_class_DefaultExpression"><!-- --></A>
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<TD><B>Methods inherited from class <A HREF="../../../org/geotools/filter/DefaultExpression.html" title="class in org.geotools.filter">DefaultExpression</A></B></TD>
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<TD><CODE><A HREF="../../../org/geotools/filter/DefaultExpression.html#accept(org.geotools.filter.FilterVisitor)">accept</A>, <A HREF="../../../org/geotools/filter/DefaultExpression.html#evaluate(java.lang.Object)">evaluate</A>, <A HREF="../../../org/geotools/filter/DefaultExpression.html#getType()">getType</A>, <A HREF="../../../org/geotools/filter/DefaultExpression.html#getValue(org.geotools.feature.Feature)">getValue</A>, <A HREF="../../../org/geotools/filter/DefaultExpression.html#isAttributeExpression(short)">isAttributeExpression</A>, <A HREF="../../../org/geotools/filter/DefaultExpression.html#isExpression(short)">isExpression</A>, <A HREF="../../../org/geotools/filter/DefaultExpression.html#isFunctionExpression(short)">isFunctionExpression</A>, <A HREF="../../../org/geotools/filter/DefaultExpression.html#isGeometryExpression(short)">isGeometryExpression</A>, <A HREF="../../../org/geotools/filter/DefaultExpression.html#isLiteralExpression(short)">isLiteralExpression</A>, <A HREF="../../../org/geotools/filter/DefaultExpression.html#isMathExpression(org.opengis.filter.expression.Expression)">isMathExpression</A>, <A HREF="../../../org/geotools/filter/DefaultExpression.html#isMathExpression(short)">isMathExpression</A></CODE></TD>
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&nbsp;<A NAME="methods_inherited_from_class_ExpressionAbstract"><!-- --></A>
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<TD><B>Methods inherited from class <A HREF="../../../org/geotools/filter/expression/ExpressionAbstract.html" title="class in org.geotools.filter.expression">ExpressionAbstract</A></B></TD>
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<TD><CODE><A HREF="../../../org/geotools/filter/expression/ExpressionAbstract.html#accept(org.opengis.filter.expression.ExpressionVisitor, java.lang.Object)">accept</A>, <A HREF="../../../org/geotools/filter/expression/ExpressionAbstract.html#eval(org.geotools.filter.Expression, org.geotools.feature.Feature)">eval</A></CODE></TD>
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&nbsp;<A NAME="methods_inherited_from_class_Object"><!-- --></A>
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<TD><B>Methods inherited from class <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></TD>
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<TD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
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&nbsp;<A NAME="methods_inherited_from_class_Expression"><!-- --></A>
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<TD><B>Methods inherited from interface Expression</B></TD>
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<TD><CODE>accept</CODE></TD>
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<!-- ============ FIELD DETAIL =========== -->

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<A NAME="attPath"><!-- --></A><H3>
attPath</H3>
<PRE>
protected <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>attPath</B></PRE>
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<DD>Holds all sub filters of this filter.
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<DL>
</DL>
</DL>
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<A NAME="colName"><!-- --></A><H3>
colName</H3>
<PRE>
protected <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>colName</B></PRE>
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<DD>Holds all sub filters of this filter.
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<DL>
</DL>
</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

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<A NAME="GeometryExpressionImpl(java.lang.String)"><!-- --></A><H3>
GeometryExpressionImpl</H3>
<PRE>
protected <B>GeometryExpressionImpl</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>&nbsp;colName)</PRE>
<DL>
<DD>Constructor with the schema for this attribute.
<P>
<DT><B>Parameters:</B><DD><CODE>colName</CODE> - a String with the schema for this attribute.</DL>

<!-- ============ METHOD DETAIL ========== -->

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<A NAME="evaluate(org.geotools.feature.Feature)"><!-- --></A><H3>
evaluate</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>evaluate</B>(<A HREF="../../../org/geotools/feature/Feature.html" title="interface in org.geotools.feature">Feature</A>&nbsp;feature)</PRE>
<DL>
<DD>Gets the value of this attribute from the passed feature.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../org/geotools/filter/Expression.html#evaluate(org.geotools.feature.Feature)">evaluate</A></CODE> in interface <CODE><A HREF="../../../org/geotools/filter/Expression.html" title="interface in org.geotools.filter">Expression</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../org/geotools/filter/DefaultExpression.html#evaluate(org.geotools.feature.Feature)">evaluate</A></CODE> in class <CODE><A HREF="../../../org/geotools/filter/DefaultExpression.html" title="class in org.geotools.filter">DefaultExpression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>feature</CODE> - Feature from which to extract attribute value.
<DT><B>Returns:</B><DD>The value of this expression based on the feature.</DL>
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<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>toString</B>()</PRE>
<DL>
<DD>Return this expression as a string.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>String representation of this attribute expression.</DL>
</DD>
</DL>
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