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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 11:36:19 GMT-05:00 2007 --><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><TITLE>DataSource (Geotools 2.3.x 2.3.2 API)</TITLE><META NAME="keywords" CONTENT="org.geotools.referencing.factory.epsg.DataSource interface"><META NAME="keywords" CONTENT="MINIMUM_PRIORITY"><META NAME="keywords" CONTENT="NORMAL_PRIORITY"><META NAME="keywords" CONTENT="MAXIMUM_PRIORITY"><META NAME="keywords" CONTENT="getPriority()"><META NAME="keywords" CONTENT="createFactory()"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="DataSource (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/DataSource.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"> PREV CLASS NEXT CLASS</FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="DataSource.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 | <A HREF="#field_summary">FIELD</A> | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | 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.referencing.factory.epsg</FONT><BR>Interface DataSource</H2><DL><DT><B>All Superinterfaces:</B> <DD><A HREF="http://java.sun.com/j2se/1.4/docs/api/javax/sql/DataSource.html" title="class or interface in javax.sql">DataSource</A></DD></DL><DL><DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../../org/geotools/referencing/factory/epsg/AccessDataSource.html" title="class in org.geotools.referencing.factory.epsg">AccessDataSource</A>, <A HREF="../../../../../org/geotools/referencing/factory/epsg/HSQLDataSource.html" title="class in org.geotools.referencing.factory.epsg">HSQLDataSource</A>, <A HREF="../../../../../org/geotools/referencing/factory/epsg/PostgreDataSource.html" title="class in org.geotools.referencing.factory.epsg">PostgreDataSource</A>, <A HREF="../../../../../org/geotools/referencing/factory/epsg/SimpleDataSource.html" title="class in org.geotools.referencing.factory.epsg">SimpleDataSource</A></DD></DL><HR><DL><DT>public interface <B>DataSource</B><DT>extends <A HREF="http://java.sun.com/j2se/1.4/docs/api/javax/sql/DataSource.html" title="class or interface in javax.sql">DataSource</A></DL><P>A marker interface for data source to an EPSG database. This sub-interface of J2SE's is used as a category for <A HREF="http://java.sun.com/j2se/1.4/docs/api/javax/imageio/spi/ServiceRegistry.html" title="class or interface in javax.imageio.spi"><CODE>ServiceRegistry</CODE></A>. EPSG data sources should be registered in the following file: <blockquote><pre>META-INF/services/org.geotools.referencing.factory.epsg.DataSource</pre></blockquote> For an example, see <A HREF="../../../../../org/geotools/referencing/factory/epsg/AccessDataSource.html" title="class in org.geotools.referencing.factory.epsg"><CODE>AccessDataSource</CODE></A> and its registration in the module. This is a very small module which can be used as a starting point for custom EPSG data sources. <p> <h3>How EPSG factory are found</h3> By default, only one <A HREF="../../../../../org/geotools/referencing/factory/epsg/DefaultFactory.html" title="class in org.geotools.referencing.factory.epsg"><CODE>DefaultFactory</CODE></A> is registered and returned by <A HREF="../../../../../org/geotools/referencing/FactoryFinder.html" title="class in org.geotools.referencing"><CODE>FactoryFinder</CODE></A>. We don't need to register any other implementation for an EPSG factory backed by a SQL database. However, alone is not suffisient for querying the database. It needs one more "plugable" information: the <cite>connection</cite> to the EPSG database. This interface is there for providing such connection to . <p> Some time after is registered as an EPSG factory, it looks for a using the same plugins mechanism than for factories. In other words, is a second level of plugins used internally by <A HREF="../../../../../org/geotools/referencing/factory/epsg/DefaultFactory.html" title="class in org.geotools.referencing.factory.epsg"><CODE>DefaultFactory</CODE></A>.<P><P><DL><DT><B>Since:</B></DT> <DD>2.1</DD><DT><B>Author:</B></DT> <DD>Martin Desruisseaux</DD><DT><B>Module:</B></DT><DD><CODE><B>module/referencing</B></CODE> (<A HREF="http://maven.geotools.fr/repository/org/geotools/gt2-referencing/"><CODE>gt2-referencing.jar</CODE></A>) (<A HREF="http://maven.geotools.fr/reports/referencing/index.html">Maven report</A>) (<A HREF="http://svn.geotools.org/geotools/tags/2.3.2/module/referencing/src/org/geotools/referencing/factory/epsg/DataSource.java">SVN head</A>)</DD></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/geotools/referencing/factory/epsg/DataSource.html#MAXIMUM_PRIORITY">MAXIMUM_PRIORITY</A></B></CODE><BR> The maximum priority for a data source, which is 100. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/geotools/referencing/factory/epsg/DataSource.html#MINIMUM_PRIORITY">MINIMUM_PRIORITY</A></B></CODE><BR> The minimum priority for a data source, which is 1. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../../org/geotools/referencing/factory/epsg/DataSource.html#NORMAL_PRIORITY">NORMAL_PRIORITY</A></B></CODE><BR> The default priority, which is 50.</TD></TR></TABLE> <!-- ======== 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">⌨️ 快捷键说明
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