attributeexpressionimpl.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

<DD><B>Deprecated.</B>&nbsp;<I>use <A HREF="../../../org/geotools/filter/AttributeExpressionImpl.html#setPropertyName(java.lang.String)"><CODE>setPropertyName(String)</CODE></A></I>
<P>
<DD>Constructor with minimum dataset for a valid expression.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../org/geotools/filter/AttributeExpression.html#setAttributePath(java.lang.String)">setAttributePath</A></CODE> in interface <CODE><A HREF="../../../org/geotools/filter/AttributeExpression.html" title="interface in org.geotools.filter">AttributeExpression</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>attPath</CODE> - The initial (required) sub filter.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/geotools/filter/IllegalFilterException.html" title="class in org.geotools.filter">IllegalFilterException</A></CODE> - If the attribute path is not in the
         schema.</DL>
</DD>
</DL>
<HR>

<A NAME="getAttributePath()"><!-- --></A><H3>
getAttributePath</H3>
<PRE>
public final <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>getAttributePath</B>()</PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>use <A HREF="../../../org/geotools/filter/AttributeExpressionImpl.html#getPropertyName()"><CODE>getPropertyName()</CODE></A></I>
<P>
<DD>This method calls <A HREF="../../../org/geotools/filter/AttributeExpressionImpl.html#getPropertyName()"><CODE>getPropertyName()</CODE></A>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../org/geotools/filter/AttributeExpression.html#getAttributePath()">getAttributePath</A></CODE> in interface <CODE><A HREF="../../../org/geotools/filter/AttributeExpression.html" title="interface in org.geotools.filter">AttributeExpression</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the attribute to be queried.</DL>
</DD>
</DL>
<HR>

<A NAME="getPropertyName()"><!-- --></A><H3>
getPropertyName</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>getPropertyName</B>()</PRE>
<DL>
<DD>Gets the path to the attribute to be evaluated by this expression.

 <CODE>PropertyName.getPropertyName()</CODE>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>getPropertyName</CODE> in interface <CODE>PropertyName</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="setPropertyName(java.lang.String)"><!-- --></A><H3>
setPropertyName</H3>
<PRE>
public void <B>setPropertyName</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;attPath)</PRE>
<DL>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<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>
</DD>
</DL>
<HR>

<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>
</DL>
</DD>
<DD><DL>

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

<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</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;obj)</PRE>
<DL>
<DD>Compares this filter to the specified object.  Returns true  if the
 passed in object is the same as this expression.  Checks  to make sure
 the expression types are the same as well as  the attribute paths and
 schemas.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>obj</CODE> - - the object to compare this ExpressionAttribute against.
<DT><B>Returns:</B><DD>true if specified object is equal to this filter; else false</DL>
</DD>
</DL>
<HR>

<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD>Override of hashCode method.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a code to hash this object by.</DL>
</DD>
</DL>
<HR>

<A NAME="accept(org.opengis.filter.expression.ExpressionVisitor, 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>(ExpressionVisitor&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>
<DL>
<DD>Used by FilterVisitors to perform some action on this filter instance.
 Typicaly used by Filter decoders, but may also be used by any thing
 which needs infomration from filter structure. Implementations should
 always call: visitor.visit(this); It is importatant that this is not
 left to a parent class unless the  parents API is identical.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>accept</CODE> in interface <CODE>Expression</CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../org/geotools/filter/expression/ExpressionAbstract.html#accept(org.opengis.filter.expression.ExpressionVisitor, java.lang.Object)">accept</A></CODE> in class <CODE><A HREF="../../../org/geotools/filter/expression/ExpressionAbstract.html" title="class in org.geotools.filter.expression">ExpressionAbstract</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>visitor</CODE> - The visitor which requires access to this filter, the
        method must call visitor.visit(this);</DL>
</DD>
</DL>
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