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201 lines
7.6 KiB
201 lines
7.6 KiB
5 years ago
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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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*
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* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
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*
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* The contents of this file are subject to the terms of either the GNU
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* General Public License Version 2 only ("GPL") or the Common Development
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* and Distribution License("CDDL") (collectively, the "License"). You
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* may not use this file except in compliance with the License. You can
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* obtain a copy of the License at
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* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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* or packager/legal/LICENSE.txt. See the License for the specific
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* language governing permissions and limitations under the License.
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*
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* When distributing the software, include this License Header Notice in each
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* file and include the License file at packager/legal/LICENSE.txt.
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*
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* GPL Classpath Exception:
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* Oracle designates this particular file as subject to the "Classpath"
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* exception as provided by Oracle in the GPL Version 2 section of the License
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* file that accompanied this code.
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*
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* Modifications:
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* If applicable, add the following below the License Header, with the fields
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* enclosed by brackets [] replaced by your own identifying information:
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* "Portions Copyright [year] [name of copyright owner]"
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*
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* Contributor(s):
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* If you wish your version of this file to be governed by only the CDDL or
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* only the GPL Version 2, indicate your decision by adding "[Contributor]
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* elects to include this software in this distribution under the [CDDL or GPL
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* Version 2] license." If you don't indicate a single choice of license, a
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* recipient has the option to distribute your version of this file under
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* either the CDDL, the GPL Version 2 or to extend the choice of license to
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* its licensees as provided above. However, if you add GPL Version 2 code
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* and therefore, elected the GPL Version 2 license, then the option applies
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* only if the new code is made subject to such option by the copyright
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* holder.
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*
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*
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* This file incorporates work covered by the following copyright and
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* permission notice:
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*
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* Copyright 2004 The Apache Software Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package javax.el;
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import java.lang.reflect.Constructor;
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import java.io.InputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.util.Properties;
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import java.io.BufferedReader;
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import java.io.InputStreamReader;
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class FactoryFinder {
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/**
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* Creates an instance of the specified class using the specified
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* <code>ClassLoader</code> object.
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*
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* @exception ELException if the given class could not be found
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* or could not be instantiated
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*/
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private static Object newInstance(String className,
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ClassLoader classLoader,
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Properties properties)
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{
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try {
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Class<?> spiClass;
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if (classLoader == null) {
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spiClass = Class.forName(className);
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} else {
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spiClass = classLoader.loadClass(className);
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}
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if (properties != null) {
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Constructor constr = null;
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try {
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constr = spiClass.getConstructor(Properties.class);
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} catch (Exception ex) {
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}
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if (constr != null) {
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return constr.newInstance(properties);
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}
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}
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return spiClass.newInstance();
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} catch (ClassNotFoundException x) {
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throw new ELException(
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"Provider " + className + " not found", x);
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} catch (Exception x) {
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throw new ELException(
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"Provider " + className + " could not be instantiated: " + x,
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x);
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}
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}
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/**
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* Finds the implementation <code>Class</code> object for the given
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* factory name, or if that fails, finds the <code>Class</code> object
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* for the given fallback class name. The arguments supplied must be
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* used in order. If using the first argument is successful, the second
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* one will not be used.
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* <P>
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* This method is package private so that this code can be shared.
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*
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* @return the <code>Class</code> object of the specified message factory;
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* may not be <code>null</code>
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*
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* @param factoryId the name of the factory to find, which is
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* a system property
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* @param fallbackClassName the implementation class name, which is
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* to be used only if nothing else
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* is found; <code>null</code> to indicate that
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* there is no fallback class name
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* @exception ELException if there is an error
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*/
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static Object find(String factoryId, String fallbackClassName,
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Properties properties)
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{
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ClassLoader classLoader;
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try {
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classLoader = Thread.currentThread().getContextClassLoader();
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} catch (Exception x) {
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throw new ELException(x.toString(), x);
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}
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String serviceId = "META-INF/services/" + factoryId;
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// try to find services in CLASSPATH
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try {
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InputStream is=null;
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if (classLoader == null) {
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is=ClassLoader.getSystemResourceAsStream(serviceId);
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} else {
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is=classLoader.getResourceAsStream(serviceId);
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}
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if( is!=null ) {
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BufferedReader rd =
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new BufferedReader(new InputStreamReader(is, "UTF-8"));
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String factoryClassName = rd.readLine();
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rd.close();
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if (factoryClassName != null &&
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! "".equals(factoryClassName)) {
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return newInstance(factoryClassName, classLoader, properties);
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}
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}
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} catch( Exception ex ) {
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}
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// try to read from $java.home/lib/el.properties
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try {
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String javah=System.getProperty( "java.home" );
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String configFile = javah + File.separator +
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"lib" + File.separator + "el.properties";
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File f=new File( configFile );
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if( f.exists()) {
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Properties props=new Properties();
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props.load( new FileInputStream(f));
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String factoryClassName = props.getProperty(factoryId);
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return newInstance(factoryClassName, classLoader, properties);
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}
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} catch(Exception ex ) {
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}
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// Use the system property
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try {
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String systemProp =
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System.getProperty( factoryId );
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if( systemProp!=null) {
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return newInstance(systemProp, classLoader, properties);
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}
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} catch (SecurityException se) {
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}
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if (fallbackClassName == null) {
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throw new ELException(
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"Provider for " + factoryId + " cannot be found", null);
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}
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return newInstance(fallbackClassName, classLoader, properties);
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}
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}
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