featureresults.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="getSchema()"><!-- --></A><H3>
getSchema</H3>
<PRE>
public <A HREF="../../../org/geotools/feature/FeatureType.html" title="interface in org.geotools.feature">FeatureType</A> <B>getSchema</B>()
                      throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Returns the FeatureType of the contents of this collection.

 <p>
 Please note that for a collection with a mixed contents the FeatureType
 may be degenerate (ie very generic). For many applications (like
 shapefiles or tables) the FeatureType can safely be used to describe
 all the Features in the result set.
 </p>
<P>
<DD><DL>

<DT><B>Returns:</B><DD>A FeatureType that describes the contents of this collection.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE> - if their is a problem getting the FeatureType.</DL>
</DD>
</DL>
<HR>

<A NAME="reader()"><!-- --></A><H3>
reader</H3>
<PRE>
public <A HREF="../../../org/geotools/data/FeatureReader.html" title="interface in org.geotools.data">FeatureReader</A> <B>reader</B>()
                     throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>please use FeatureCollections.features() to obtain a
             FeatureIterator</I>
<P>
<DD>Provides access to the Features, please note that FeatureReader is a
 blocking api.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>A FeatureReader streaming over the FeatureResults
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE> - DOCUMENT ME!</DL>
</DD>
</DL>
<HR>

<A NAME="getBounds()"><!-- --></A><H3>
getBounds</H3>
<PRE>
public <A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Envelope.html" title="class or interface in com.vividsolutions.jts.geom">Envelope</A> <B>getBounds</B>()</PRE>
<DL>
<DD>Returns the bounding box of this FeatureResults.

 <p>
 This opperation may be expensive. Consider
 <code>FeatureSource.getBounds( Query )</code> as an alternative.
 </p>
 This method is logically the same as:
 <pre>
 <code>
 <b>public</b> Envelope getBounds() <b>throws</b> IOException {
     Envelope newBBox = <b>new</b> Envelope();
     Envelope internal;
     Feature feature;

     <b>for</b> (FeatureReader r = reader(); r.hasNext();) {
         feature = r.next();
         internal = feature.getDefaultGeometry().getEnvelopeInternal();
         newBBox.expandToInclude(internal);
     }
     <b>return</b> newBBox;
 }
 </code>
 </pre>
<P>
<DD><DL>

<DT><B>Returns:</B><DD>Bounding box of this FeatureResults, or an empty Envelope</DL>
</DD>
</DL>
<HR>

<A NAME="getCount()"><!-- --></A><H3>
getCount</H3>
<PRE>
public int <B>getCount</B>()
             throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>Please use FeatureCollection.size() instead</I>
<P>
<DD>Returns the number of Features in this FeatureResults.

 <p>
 This opperation may be expensive. Consider <code>FeatureSource.getCount(
 Query )</code> as an alternative.
 </p>
 This method is logically the same as:
 <pre>
 <code>
 <b>public</b> int getCount() <b>throws</b> IOException {
     <b>int</b> count = 0;
     <b>for</b> (FeatureReader r = reader(); r.hasNext(); count++) {
         r.next();
     }
     <b>return</b> count;
 }
 </code>
 </pre>
<P>
<DD><DL>

<DT><B>Returns:</B><DD>The number of Features in this FeatureResults.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE> - If there are problems getting the count</DL>
</DD>
</DL>
<HR>

<A NAME="collection()"><!-- --></A><H3>
collection</H3>
<PRE>
public <A HREF="../../../org/geotools/feature/FeatureCollection.html" title="interface in org.geotools.feature">FeatureCollection</A> <B>collection</B>()
                             throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>please consider explicitly constructing a feaure collection</I>
<P>
<DD>Convert this set of results to a FeatureCollection.

 <p>
 This method is logically the same as:
 <pre><code>
 <b>public</b> FeatureCollection collection() <b>throws</b> IOException {
     FeatureCollection collection = FeatureCollections.newCollection()
     <b>for</b> (FeatureReader r = reader(); r.hasNext();) {
         collection.add( r.next() );
     }
     <b>return</b> collection;
 }
 </code></pre>
 </p>
<P>
<DD><DL>

<DT><B>Returns:</B><DD>DOCUMENT ME!
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE> - If any problems occur aquiring Features</DL>
</DD>
</DL>
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