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Jakarta Faces defines an MVC framework for building user interfaces for web applications,
including UI components, state management, event handing, input validation, page navigation, and
support for internationalization and accessibility.
/*
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.faces.spi;
import com.sun.faces.util.Util;
import com.sun.faces.util.FacesLogger;
import javax.faces.FacesException;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.List;
import java.util.Enumeration;
import java.util.ArrayList;
import java.util.Arrays;
import java.net.URL;
import java.net.URLConnection;
import java.io.IOException;
import java.io.InputStream;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
/**
*
* Base class for service discovery.
*
*/
final class ServiceFactoryUtils {
private static final Logger LOGGER = FacesLogger.APPLICATION.getLogger();
private static final String[] EMPTY_ARRAY = new String[0];
// ---------------------------------------------------------- Public Methods
static Object getProviderFromEntry(String entry, Class[] argumentTypes, Object[] arguments) {
if (entry == null) {
return null;
}
try {
Class clazz = Util.loadClass(entry, null);
Constructor c = clazz.getDeclaredConstructor(argumentTypes);
if (c == null) {
throw new FacesException("Unable to find constructor accepting arguments: " + Arrays.toString(arguments));
}
return c.newInstance(arguments);
} catch (ClassNotFoundException | NoSuchMethodException | SecurityException | FacesException | InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.log(Level.FINE, e.toString(), e);
}
return null;
}
}
static String[] getServiceEntries(String key) {
List results = null;
ClassLoader loader = Thread.currentThread().getContextClassLoader();
if (loader == null) {
return EMPTY_ARRAY;
}
Enumeration urls = null;
String serviceName = "META-INF/services/" + key;
try {
urls = loader.getResources(serviceName);
} catch (IOException ioe) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE,
ioe.toString(),
ioe);
}
}
if (urls != null) {
InputStream input = null;
BufferedReader reader = null;
while (urls.hasMoreElements()) {
try {
if (results == null) {
results = new ArrayList<>();
}
URL url = urls.nextElement();
URLConnection conn = url.openConnection();
conn.setUseCaches(false);
input = conn.getInputStream();
if (input != null) {
try {
reader =
new BufferedReader(new InputStreamReader(input,
"UTF-8"));
} catch (Exception e) {
// The DM_DEFAULT_ENCODING warning is acceptable here
// because we explicitly *want* to use the Java runtime's
// default encoding.
reader =
new BufferedReader(new InputStreamReader(input));
}
for (String line = reader.readLine();
line != null;
line = reader.readLine()) {
results.add(line.trim());
}
}
} catch (Exception e) {
if (LOGGER.isLoggable(Level.SEVERE)) {
LOGGER.log(Level.SEVERE,
"jsf.spi.provider.cannot_read_service",
new Object[]{serviceName});
LOGGER.log(Level.SEVERE,
e.toString(),
e);
}
} finally {
if (input != null) {
try {
input.close();
} catch (Exception e) {
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.log(Level.FINEST, "Closing stream", e);
}
}
}
if (reader != null) {
try {
reader.close();
} catch (Exception e) {
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.log(Level.FINEST, "Closing stream", e);
}
}
}
}
}
}
return ((results != null && !results.isEmpty())
? results.toArray(new String[results.size()])
: EMPTY_ARRAY);
}
}