abstractfeaturesource.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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<B>Constructor Detail</B></FONT></TD>
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<A NAME="AbstractFeatureSource()"><!-- --></A><H3>
AbstractFeatureSource</H3>
<PRE>
public <B>AbstractFeatureSource</B>()</PRE>
<DL>
</DL>

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<B>Method Detail</B></FONT></TD>
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<A NAME="getTransaction()"><!-- --></A><H3>
getTransaction</H3>
<PRE>
public <A HREF="../../../org/geotools/data/Transaction.html" title="interface in org.geotools.data">Transaction</A> <B>getTransaction</B>()</PRE>
<DL>
<DD>Retrieve the Transaction this FeatureSource is operating against.

 <p>
 For a plain FeatureSource that cannot modify this will always be Transaction.AUTO_COMMIT.
 </p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>Transacstion FeatureSource is operating against</DL>
</DD>
</DL>
<HR>

<A NAME="getFeatures(org.geotools.data.Query)"><!-- --></A><H3>
getFeatures</H3>
<PRE>
public <A HREF="../../../org/geotools/feature/FeatureCollection.html" title="interface in org.geotools.feature">FeatureCollection</A> <B>getFeatures</B>(<A HREF="../../../org/geotools/data/Query.html" title="interface in org.geotools.data">Query</A>&nbsp;query)</PRE>
<DL>
<DD>Provides an interface to for the Results of a Query.

 <p>
 Various queries can be made against the results, the most basic being to retrieve Features.
 </p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../org/geotools/data/FeatureSource.html#getFeatures(org.geotools.data.Query)">getFeatures</A></CODE> in interface <CODE><A HREF="../../../org/geotools/data/FeatureSource.html" title="interface in org.geotools.data">FeatureSource</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>query</CODE> - 
<DT><B>Returns:</B><DD>Collection The collection to put the features into.<DT><B>See Also:</B><DD><A HREF="../../../org/geotools/data/FeatureSource.html#getFeatures(org.geotools.data.Query)"><CODE>FeatureSource.getFeatures(org.geotools.data.Query)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getFeatures(org.geotools.filter.Filter)"><!-- --></A><H3>
getFeatures</H3>
<PRE>
public <A HREF="../../../org/geotools/feature/FeatureCollection.html" title="interface in org.geotools.feature">FeatureCollection</A> <B>getFeatures</B>(<A HREF="../../../org/geotools/filter/Filter.html" title="interface in org.geotools.filter">Filter</A>&nbsp;filter)
                              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>Retrieve all Feature matching the Filter.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../org/geotools/data/FeatureSource.html#getFeatures(org.geotools.filter.Filter)">getFeatures</A></CODE> in interface <CODE><A HREF="../../../org/geotools/data/FeatureSource.html" title="interface in org.geotools.data">FeatureSource</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>filter</CODE> - Indicates features to retrieve
<DT><B>Returns:</B><DD>FeatureResults indicating features matching filter
<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 results could not be obtained</DL>
</DD>
</DL>
<HR>

<A NAME="getFeatures()"><!-- --></A><H3>
getFeatures</H3>
<PRE>
public <A HREF="../../../org/geotools/feature/FeatureCollection.html" title="interface in org.geotools.feature">FeatureCollection</A> <B>getFeatures</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>Retrieve all Features.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../org/geotools/data/FeatureSource.html#getFeatures()">getFeatures</A></CODE> in interface <CODE><A HREF="../../../org/geotools/data/FeatureSource.html" title="interface in org.geotools.data">FeatureSource</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>FeatureResults of all Features in FeatureSource
<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 features could not be obtained</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>()
                   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>Retrieve Bounds of all Features.

 <p>
 Currently returns null, consider getFeatures().getBounds() instead.
 </p>

 <p>
 Subclasses may override this method to perform the appropriate optimization for this result.
 </p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../org/geotools/data/FeatureSource.html#getBounds()">getBounds</A></CODE> in interface <CODE><A HREF="../../../org/geotools/data/FeatureSource.html" title="interface in org.geotools.data">FeatureSource</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>null representing the lack of an optimization
<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(org.geotools.data.Query)"><!-- --></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>(<A HREF="../../../org/geotools/data/Query.html" title="interface in org.geotools.data">Query</A>&nbsp;query)
                   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>Retrieve Bounds of Query results.

 <p>
 Currently returns null, consider getFeatures( query ).getBounds() instead.
 </p>

 <p>
 Subclasses may override this method to perform the appropriate optimization for this result.
 </p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../org/geotools/data/FeatureSource.html#getBounds(org.geotools.data.Query)">getBounds</A></CODE> in interface <CODE><A HREF="../../../org/geotools/data/FeatureSource.html" title="interface in org.geotools.data">FeatureSource</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>query</CODE> - Query we are requesting the bounds of
<DT><B>Returns:</B><DD>null representing the lack of an optimization
<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="namedQuery(org.geotools.data.Query)"><!-- --></A><H3>
namedQuery</H3>
<PRE>
protected <A HREF="../../../org/geotools/data/Query.html" title="interface in org.geotools.data">Query</A> <B>namedQuery</B>(<A HREF="../../../org/geotools/data/Query.html" title="interface in org.geotools.data">Query</A>&nbsp;query)</PRE>
<DL>
<DD>Ensure query modified with typeName.
 <p>
 This method will make copy of the provided query, using
 DefaultQuery, if query.getTypeName is not equal to
 getSchema().getTypeName().
 </p>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>query</CODE> - Original query
<DT><B>Returns:</B><DD>Query with getTypeName() equal to getSchema().getTypeName()</DL>
</DD>
</DL>
<HR>

<A NAME="getCount(org.geotools.data.Query)"><!-- --></A><H3>
getCount</H3>
<PRE>
public int <B>getCount</B>(<A HREF="../../../org/geotools/data/Query.html" title="interface in org.geotools.data">Query</A>&nbsp;query)
             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>Retrieve total number of Query results.

 <p>
 Currently returns -1, consider getFeatures( query ).getCount() instead.
 </p>

 <p>
 Subclasses may override this method to perform the appropriate optimization for this result.
 </p>
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../org/geotools/data/FeatureSource.html#getCount(org.geotools.data.Query)">getCount</A></CODE> in interface <CODE><A HREF="../../../org/geotools/data/FeatureSource.html" title="interface in org.geotools.data">FeatureSource</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>query</CODE> - Query we are requesting the count of
<DT><B>Returns:</B><DD>-1 representing the lack of an optimization
<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 errors getting the count</DL>
</DD>
</DL>
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