/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.catalina.startup;
import java.io.File;
import java.net.URL;
import java.util.ArrayList;
import org.apache.catalina.loader.StandardClassLoader;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* <p>Utility class for building class loaders for Catalina. The factory
* method requires the following parameters in order to build a new class
* loader (with suitable defaults in all cases):</p>
* <ul>
* <li>A set of directories containing unpacked classes (and resources)
* that should be included in the class loader's
* repositories.</li>
* <li>A set of directories containing classes and resources in JAR files.
* Each readable JAR file discovered in these directories will be
* added to the class loader's repositories.</li>
* <li><code>ClassLoader</code> instance that should become the parent of
* the new class loader.</li>
* </ul>
*
* @author Craig R. McClanahan
* @version $Revision: 303210 $ $Date: 2004-09-07 19:13:01 -0400 (Tue, 07 Sep 2004) $
*/
public final class ClassLoaderFactory {
private static Log log = LogFactory.getLog(ClassLoaderFactory.class);
// --------------------------------------------------------- Public Methods
/**
* Create and return a new class loader, based on the configuration
* defaults and the specified directory paths:
*
* @param unpacked Array of pathnames to unpacked directories that should
* be added to the repositories of the class loader, or <code>null</code>
* for no unpacked directories to be considered
* @param packed Array of pathnames to directories containing JAR files
* that should be added to the repositories of the class loader,
* or <code>null</code> for no directories of JAR files to be considered
* @param parent Parent class loader for the new class loader, or
* <code>null</code> for the system class loader.
*
* @exception Exception if an error occurs constructing the class loader
*/
public static ClassLoader createClassLoader(File unpacked[],
File packed[],
ClassLoader parent)
throws Exception {
return createClassLoader(unpacked, packed, null, parent);
}
/**
* Create and return a new class loader, based on the configuration
* defaults and the specified directory paths:
*
* @param unpacked Array of pathnames to unpacked directories that should
* be added to the repositories of the class loader, or <code>null</code>
* for no unpacked directories to be considered
* @param packed Array of pathnames to directories containing JAR files
* that should be added to the repositories of the class loader,
* or <code>null</code> for no directories of JAR files to be considered
* @param urls Array of URLs to remote repositories, designing either JAR
* resources or uncompressed directories that should be added to
* the repositories of the class loader, or <code>null</code> for no
* directories of JAR files to be considered
* @param parent Parent class loader for the new class loader, or
* <code>null</code> for the system class loader.
*
* @exception Exception if an error occurs constructing the class loader
*/
public static ClassLoader createClassLoader(File unpacked[],
File packed[],
URL urls[],
ClassLoader parent)
throws Exception {
if (log.isDebugEnabled())
log.debug("Creating new class loader");
// Construct the "class path" for this class loader
ArrayList list = new ArrayList();
// Add unpacked directories
if (unpacked != null) {
for (int i = 0; i < unpacked.length; i++) {
File file = unpacked[i];
if (!file.exists() || !file.canRead())
continue;
file = new File(file.getCanonicalPath() + File.separator);
URL url = file.toURL();
if (log.isDebugEnabled())
log.debug(" Including directory " + url);
list.add(url);
}
}
// Add packed directory JAR files
if (packed != null) {
for (int i = 0; i < packed.length; i++) {
File directory = packed[i];
if (!directory.isDirectory() || !directory.exists() ||
!directory.canRead())
continue;
String filenames[] = directory.list();
for (int j = 0; j < filenames.length; j++) {
String filename = filenames[j].toLowerCase();
if (!filename.endsWith(".jar"))
continue;
File file = new File(directory, filenames[j]);
if (log.isDebugEnabled())
log.debug(" Including jar file " + file.getAbsolutePath());
URL url = file.toURL();
list.add(url);
}
}
}
// Add URLs
if (urls != null) {
for (int i = 0; i < urls.length; i++) {
if (log.isDebugEnabled())
log.debug(" Including URL " + urls[i]);
list.add(urls[i]);
}
}
// Construct the class loader itself
URL[] array = (URL[]) list.toArray(new URL[list.size()]);
StandardClassLoader classLoader = null;
if (parent == null)
classLoader = new StandardClassLoader(array);
else
classLoader = new StandardClassLoader(array, parent);
return (classLoader);
}
}