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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 11:36:21 GMT-05:00 2007 --><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><TITLE>FactoryFinder (Geotools 2.3.x 2.3.2 API)</TITLE><META NAME="keywords" CONTENT="org.geotools.factory.FactoryFinder class"><META NAME="keywords" CONTENT="findClassLoaders()"><META NAME="keywords" CONTENT="findFactory()"><META NAME="keywords" CONTENT="factories()"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="FactoryFinder (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/FactoryFinder.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/factory/FactoryCreator.html" title="class in org.geotools.factory"><B>PREV CLASS</B></A> <A HREF="../../../org/geotools/factory/FactoryRegistry.html" title="class in org.geotools.factory"><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="FactoryFinder.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.factory</FONT><BR>Class FactoryFinder</H2><PRE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by"><B>FactoryFinder</B></PRE><HR><B>Deprecated.</B> <I>The proposed replacement is <A HREF="../../../org/geotools/factory/FactoryRegistry.html" title="class in org.geotools.factory"><CODE>FactoryRegistry</CODE></A>, which is built on top of a J2SE class (<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>). Guidlines are provided in the <A HREF="../../../org/geotools/factory/package-summary.html"><CODE>org.geotools.factory</CODE></A> package description.</I><P><DL><DT>public final class <B>FactoryFinder</B><DT>extends <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></DL><P>This code was mostly spiked from SAXParserFactory, which I know runs in applets. The former way of doing things was to use System.getProperty, which cause security problems. Because EVERYTHING in geotools uses factories, I thought, "hey, we should make a class for this, or something". The other problem was using the ServiceProvider thing from sun, BUT THIS COMPLETELY VIOLATES ALL THE PRINCIPLES OF MAKING OUR CODE JVM INDEPENDENT!!!!!!!!!!! This package works the same way. <br> The mechanism for finding factories (which must implement Factory) is as follows: <br> <pre> <ol> <li> Look up key in System properties. If key doesn't exist or a SecurityException is thrown, fall through. Otherwise attempt to instantiate the given class. </li> <li> Search the resource paths for the key in META-INF/services. If the resource is found, the file is read and the class is instantiated. If the resource does not exist, fall through </li> <li> Finally, each call to findFactory must provide a default implementation class name. If this class is found, it is instantiated and used. If not, a grave error is thrown (FactoryConfigurationError). </li> </OL> </pre> The ClassLoader used to search for resources can be specfied, and if not provided, the search mechanism uses first Thread.getContextClassLoader and then falls back on the system ClassLoader. <br><P><P><DL><DT><B>Author:</B></DT> <DD>Ian Schneider</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/factory/FactoryFinder.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>static <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Iterator.html" title="class or interface in java.util">Iterator</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/factory/FactoryFinder.html#factories(java.lang.Class)">factories</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A> key)</CODE><BR> <B>Deprecated.</B> A convenience method for factories(key,null).</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Iterator.html" title="class or interface in java.util">Iterator</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/factory/FactoryFinder.html#factories(java.lang.Class, java.lang.ClassLoader)">factories</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Class.html" title="class or interface in java.lang">Class</A> key, <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/ClassLoader.html" title="class or interface in java.lang">ClassLoader</A> loader)</CODE><BR> <B>Deprecated.</B> Obtain an Iterator of Factory Objects which are found using the given key. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/ClassLoader.html" title="class or interface in java.lang">ClassLoader</A>[]</CODE></FONT></TD><TD><CODE><B><A HREF="../../../org/geotools/factory/FactoryFinder.html#findClassLoaders()">findClassLoaders</A></B>()</CODE><BR> <B>Deprecated.</B> Returns the context class loaded (if available) as well as the system class loader.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static <A HREF="../../../org/geotools/factory/Factory.html" title="interface in org.geotools.factory">Factory</A></CODE></FONT></TD>⌨️ 快捷键说明
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