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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.4.2_13) on Tue Jun 05 11:36:23 GMT-05:00 2007 --><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><TITLE>FeatureReader (Geotools 2.3.x 2.3.2 API)</TITLE><META NAME="keywords" CONTENT="org.geotools.data.FeatureReader interface"><META NAME="keywords" CONTENT="getFeatureType()"><META NAME="keywords" CONTENT="next()"><META NAME="keywords" CONTENT="hasNext()"><META NAME="keywords" CONTENT="close()"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="FeatureReader (Geotools 2.3.x 2.3.2 API)";}</SCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/FeatureReader.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../org/geotools/data/FeatureLocking.html" title="interface in org.geotools.data"><B>PREV CLASS</B></A> <A HREF="../../../org/geotools/data/FeatureResults.html" title="interface in org.geotools.data"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="FeatureReader.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">org.geotools.data</FONT><BR>Interface FeatureReader</H2><DL><DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../org/geotools/data/CollectionFeatureReader.html" title="class in org.geotools.data">CollectionFeatureReader</A>, <A HREF="../../../org/geotools/data/DefaultFeatureReader.html" title="class in org.geotools.data">DefaultFeatureReader</A>, <A HREF="../../../org/geotools/data/collection/DelegateFeatureReader.html" title="class in org.geotools.data.collection">DelegateFeatureReader</A>, <A HREF="../../../org/geotools/data/DiffFeatureReader.html" title="class in org.geotools.data">DiffFeatureReader</A>, <A HREF="../../../org/geotools/data/EmptyFeatureReader.html" title="class in org.geotools.data">EmptyFeatureReader</A>, <A HREF="../../../org/geotools/xml/gml/FCBuffer.html" title="class in org.geotools.xml.gml">FCBuffer</A>, <A HREF="../../../org/geotools/data/FIDFeatureReader.html" title="class in org.geotools.data">FIDFeatureReader</A>, <A HREF="../../../org/geotools/data/FilteringFeatureReader.html" title="class in org.geotools.data">FilteringFeatureReader</A>, <A HREF="../../../org/geotools/data/crs/ForceCoordinateSystemFeatureReader.html" title="class in org.geotools.data.crs">ForceCoordinateSystemFeatureReader</A>, <A HREF="../../../org/geotools/data/jdbc/JDBCFeatureReader.html" title="class in org.geotools.data.jdbc">JDBCFeatureReader</A>, <A HREF="../../../org/geotools/data/MaxFeatureReader.html" title="class in org.geotools.data">MaxFeatureReader</A>, <A HREF="../../../org/geotools/data/property/PropertyFeatureReader.html" title="class in org.geotools.data.property">PropertyFeatureReader</A>, <A HREF="../../../org/geotools/data/crs/ReprojectFeatureReader.html" title="class in org.geotools.data.crs">ReprojectFeatureReader</A>, <A HREF="../../../org/geotools/data/ReTypeFeatureReader.html" title="class in org.geotools.data">ReTypeFeatureReader</A>, StrictWFSStrategy.StrictFeatureReader, <A HREF="../../../org/geotools/data/tiger/TigerFeatureReader.html" title="class in org.geotools.data.tiger">TigerFeatureReader</A>, <A HREF="../../../org/geotools/data/vpf/VPFFeatureReader.html" title="class in org.geotools.data.vpf">VPFFeatureReader</A>, <A HREF="../../../org/geotools/data/vpf/file/VPFFileFeatureReader.html" title="class in org.geotools.data.vpf.file">VPFFileFeatureReader</A></DD></DL><HR><DL><DT>public interface <B>FeatureReader</B></DL><P>The low-level interface for reading Features. Will use the underlying AttributeReader and the given FeatureType to create new Features. <p> Typical use is as follows: <pre><code> FeatureReader reader = null; try{ for( reader = data.getFeatureReader( filter ); reader.hasNext(); ){ f = reader.next(); ... } } catch (IOException problem){ ... } finally { if( reader != null ){ try { reader.close(); } catch( IOException eek){ } } } </code></pre> <h2>Questions and Suggestions</h2> <ul> <li>Q: Should FeatureReader provide access to the AttributeReaders it uses? <br>A: No, it looks like we will make a lazy Feature in order to cleanly allow for lazy parsing of attribtues. </li> <li>Q:FeatureReader has a close method, but no open method? <br>A: This is by design allowing FeatureReader to encapsulate its InputStream or Rowset). Please assume that FeatureReaders are a single use proposition. </li> <li>Q: All that exception handling is a pain! A: Yes it is, we have constructed semi-normal Java iterators to cut down on the pain. But you *do* still have to close 'em - this is IO after all. </li> <li>Q: Can we include skip(int) - SeanG A: The order of the contents is not "known" or predicatable to the end user, so skip( int ) would be useless. For random access (a higher order of abstraction then FeatureReader) please look at FeatureList. </li> </ul> </p><P><P><DL><DT><B>Author:</B></DT> <DD>Ian Schneider, Sean Geoghegan, Defence Science and Technology Organisation.</DD><DT><B>Module:</B></DT><DD><CODE><B>module/api</B></CODE> (<A HREF="http://maven.geotools.fr/repository/org/geotools/gt2-api/"><CODE>gt2-api.jar</CODE></A>) (<A HREF="http://maven.geotools.fr/reports/api/index.html">Maven report</A>) (<A HREF="http://svn.geotools.org/geotools/tags/2.3.2/module/api/src/org/geotools/data/FeatureReader.java">SVN head</A>)</DD></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD>⌨️ 快捷键说明
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