indexedfidreader.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

IndexedFidReader</H3>
<PRE>
public <B>IndexedFidReader</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;typeName,
                        <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/nio/channels/ReadableByteChannel.html" title="class or interface in java.nio.channels">ReadableByteChannel</A>&nbsp;readChannel)
                 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>
</DL>
<HR>

<A NAME="IndexedFidReader(java.lang.String, org.geotools.data.shapefile.indexed.RecordNumberTracker, java.nio.channels.ReadableByteChannel)"><!-- --></A><H3>
IndexedFidReader</H3>
<PRE>
public <B>IndexedFidReader</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;typeName,
                        <A HREF="../../../../../org/geotools/data/shapefile/indexed/RecordNumberTracker.html" title="interface in org.geotools.data.shapefile.indexed">RecordNumberTracker</A>&nbsp;reader,
                        <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/nio/channels/ReadableByteChannel.html" title="class or interface in java.nio.channels">ReadableByteChannel</A>&nbsp;readChannel)
                 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>
</DL>

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

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<B>Method Detail</B></FONT></TD>
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<A NAME="getCount()"><!-- --></A><H3>
getCount</H3>
<PRE>
public long <B>getCount</B>()</PRE>
<DL>
<DD>Returns the number of Fid Entries in the file.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>Returns the number of Fid Entries in the file.</DL>
</DD>
</DL>
<HR>

<A NAME="getRemoves()"><!-- --></A><H3>
getRemoves</H3>
<PRE>
public int <B>getRemoves</B>()</PRE>
<DL>
<DD>Returns the number of features that have been removed since the
 fid index was regenerated.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>Returns the number of features that have been removed since the
         fid index was regenerated.</DL>
</DD>
</DL>
<HR>

<A NAME="findFid(java.lang.String)"><!-- --></A><H3>
findFid</H3>
<PRE>
public long <B>findFid</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;fid)
             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 offset to the location in the SHX file that the fid
 identifies. This search take logN time.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>fid</CODE> - the fid to find.
<DT><B>Returns:</B><DD>Returns the record number of the record in the SHX file that the
         fid identifies. Will return -1 if the fid was not found.
<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>
<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> - DOCUMENT ME!</DL>
</DD>
</DL>
<HR>

<A NAME="goTo(long)"><!-- --></A><H3>
goTo</H3>
<PRE>
public void <B>goTo</B>(long&nbsp;recno)
          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>move the reader to the recno-th entry in the file.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>recno</CODE> - 
<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></DL>
</DD>
</DL>
<HR>

<A NAME="close()"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</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>Description copied from interface: <CODE><A HREF="../../../../../org/geotools/data/FIDReader.html" title="interface in org.geotools.data">FIDReader</A></CODE></B></DD>
<DD>Release any resources associated with this reader
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/geotools/data/FIDReader.html#close()">close</A></CODE> in interface <CODE><A HREF="../../../../../org/geotools/data/FIDReader.html" title="interface in org.geotools.data">FIDReader</A></CODE></DL>
</DD>
<DD><DL>

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

<A NAME="hasNext()"><!-- --></A><H3>
hasNext</H3>
<PRE>
public boolean <B>hasNext</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>Description copied from interface: <CODE><A HREF="../../../../../org/geotools/data/FIDReader.html" title="interface in org.geotools.data">FIDReader</A></CODE></B></DD>
<DD>Returns whether another fid exists for this reader.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/geotools/data/FIDReader.html#hasNext()">hasNext</A></CODE> in interface <CODE><A HREF="../../../../../org/geotools/data/FIDReader.html" title="interface in org.geotools.data">FIDReader</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD><code>true</code> if more content exists
<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></DL>
</DD>
</DL>
<HR>

<A NAME="next()"><!-- --></A><H3>
next</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>next</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>Description copied from interface: <CODE><A HREF="../../../../../org/geotools/data/FIDReader.html" title="interface in org.geotools.data">FIDReader</A></CODE></B></DD>
<DD>Gets the next FID from the Reader.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/geotools/data/FIDReader.html#next()">next</A></CODE> in interface <CODE><A HREF="../../../../../org/geotools/data/FIDReader.html" title="interface in org.geotools.data">FIDReader</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>Next featureID
<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></DL>
</DD>
</DL>
<HR>

<A NAME="currentIndex()"><!-- --></A><H3>
currentIndex</H3>
<PRE>
public int <B>currentIndex</B>()</PRE>
<DL>
<DD>Returns the record number of the feature in the shx or shp that
 is identified by the the last fid returned by next().
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>Returns the record number of the feature in the shx or shp that
         is identified by the the last fid returned by next().
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/NoSuchElementException.html" title="class or interface in java.util">NoSuchElementException</A></CODE> - DOCUMENT ME!</DL>
</DD>
</DL>
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