filters.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="NOTFOUND"><!-- --></A><H3>
NOTFOUND</H3>
<PRE>
public static final int <B>NOTFOUND</B></PRE>
<DL>
<DD><code>NOTFOUND</code> indicates int value was unavailable
<P>
<DL>
<DT><B>See Also:</B><DD><A HREF="../../../constant-values.html#org.geotools.filter.Filters.NOTFOUND">Constant Field Values</A></DL>
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<A NAME="Filters()"><!-- --></A><H3>
Filters</H3>
<PRE>
public <B>Filters</B>()</PRE>
<DL>
</DL>
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<A NAME="Filters(org.geotools.filter.FilterFactory)"><!-- --></A><H3>
Filters</H3>
<PRE>
public <B>Filters</B>(<A HREF="../../../org/geotools/filter/FilterFactory.html" title="interface in org.geotools.filter">FilterFactory</A>&nbsp;factory)</PRE>
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<A NAME="setFilterFactory(org.geotools.filter.FilterFactory)"><!-- --></A><H3>
setFilterFactory</H3>
<PRE>
public void <B>setFilterFactory</B>(<A HREF="../../../org/geotools/filter/FilterFactory.html" title="interface in org.geotools.filter">FilterFactory</A>&nbsp;factory)</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
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<A NAME="duplicate(org.geotools.filter.Filter)"><!-- --></A><H3>
duplicate</H3>
<PRE>
public <A HREF="../../../org/geotools/filter/Filter.html" title="interface in org.geotools.filter">Filter</A> <B>duplicate</B>(<A HREF="../../../org/geotools/filter/Filter.html" title="interface in org.geotools.filter">Filter</A>&nbsp;filter)</PRE>
<DL>
<DD>Deep copy the filter.
 <p>
 Filter objects are mutable, when copying a rich
 data structure (like SLD) you will need to duplicate
 the Filters referenced therein.
 </p>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="asInt(org.opengis.filter.expression.Expression)"><!-- --></A><H3>
asInt</H3>
<PRE>
public static int <B>asInt</B>(Expression&nbsp;expr)</PRE>
<DL>
<DD>Uses number( expr ), will turn result into an interger, or NOTFOUND
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>expr</CODE> - 
<DT><B>Returns:</B><DD>int value of first Number, or NOTFOUND</DL>
</DD>
</DL>
<HR>

<A NAME="asString(org.opengis.filter.expression.Expression)"><!-- --></A><H3>
asString</H3>
<PRE>
public static <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>asString</B>(Expression&nbsp;expr)</PRE>
<DL>
<DD>Uses string( expr ), will turn result into a String
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>expr</CODE> - 
<DT><B>Returns:</B><DD>value of first String</DL>
</DD>
</DL>
<HR>

<A NAME="asDouble(org.opengis.filter.expression.Expression)"><!-- --></A><H3>
asDouble</H3>
<PRE>
public static double <B>asDouble</B>(Expression&nbsp;expr)</PRE>
<DL>
<DD>Uses number( expr ), will turn result into an interger, or NaN.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>expr</CODE> - 
<DT><B>Returns:</B><DD>int value of first Number, or Double.NaN</DL>
</DD>
</DL>
<HR>

<A NAME="asType(org.opengis.filter.expression.Expression, java.lang.Class)"><!-- --></A><H3>
asType</H3>
<PRE>
public static <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>asType</B>(Expression&nbsp;expr,
                            <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A>&nbsp;TYPE)</PRE>
<DL>
<DD>Navigate through the expression seaching for TYPE.
 
 <p>
 This will work even with dynamic expression that would normall require a
 feature. It works especially well when the Expression is a Literal
 literal (which is usually the case).
 </p>
 
 <p>
 If you have a specific Feature, please do this:
 <pre><code>
 Object value = expr.getValue( feature );
 return value instanceof Color ? (Color) value : null;
 </code></pre>
 </p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>expr</CODE> - <DD><CODE>TYPE</CODE> - DOCUMENT ME!
<DT><B>Returns:</B><DD>First available color, or null.</DL>
</DD>
</DL>
<HR>

<A NAME="number(java.lang.Object)"><!-- --></A><H3>
number</H3>
<PRE>
public static double <B>number</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;value)</PRE>
<DL>
<DD>Treat provided value as a Number, used for math opperations.
 <p>
 This function allows for the non stongly typed Math Opperations
 favoured by the Expression standard.
 </p>
 <p>
 Able to hanle:
 <ul>
 <li>null - to NaN
 <li>Number
 <li>String - valid Integer and Double encodings
 </ul>
 
 </p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>value</CODE> - 
<DT><B>Returns:</B><DD>double or Double.NaN;
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/IllegalArgumentException.html" title="class or interface in java.lang">IllegalArgumentException</A></CODE> - For non numerical among us -- like Geometry</DL>
</DD>
</DL>
<HR>

<A NAME="gets(java.lang.String, java.lang.Class)"><!-- --></A><H3>
gets</H3>
<PRE>
public static <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>gets</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;text,
                          <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A>&nbsp;TYPE)
                   throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Throwable.html" title="class or interface in java.lang">Throwable</A></PRE>
<DL>
<DD>Used to upcovnert a "Text Value" into the provided TYPE.
 <p>
 Used to tread softly on the Java typing system, because
 Filter/Expression is not strongly typed. Values in in
 Expression land are often not the the real Java Objects
 we wish they were - it is reall a small, lax, query
 language and Java objects need a but of help getting
 through.
 <p>
 </p>
 A couple notes:
 <ul>
 <li>Usual trick of reflection for a Constructors that
     supports a String parameter is used as a last ditch effort.
     </li>
 <li>will do its best to turn Object into the indicated Class
 <li>will be used for ordering literals against attribute values
     are calculated at runtime (like Date.)
 </ul>
 Remember Strong typing is for whimps who know what they are
 doing ahead of time. Real programmers let their program
 learn at runtime... :-)
 </p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>text</CODE> - <DD><CODE>TYPE</CODE> - 
<DT><B>Throws:</B>
<DD><CODE>open</CODE> - set of Throwable reflection for TYPE( String )
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Throwable.html" title="class or interface in java.lang">Throwable</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="puts(double)"><!-- --></A><H3>
puts</H3>
<PRE>
public static <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>puts</B>(double&nbsp;number)</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
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<A NAME="puts(java.lang.Object)"><!-- --></A><H3>
puts</H3>
<PRE>
public static <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>puts</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>Inverse of eval, used to softly type supported
 types into Text for use as literals.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="puts(java.awt.Color)"><!-- --></A><H3>
puts</H3>
<PRE>
public static <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>puts</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/Color.html" title="class or interface in java.awt">Color</A>&nbsp;color)</PRE>
<DL>
<DD><DL>
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