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// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package jodd.util;
import jodd.io.IOUtil;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
/**
* Utilities to manipulate class path, define and find classes etc.
*/
public class ClassLoaderUtil {
public static ClassLoaderStrategy classLoaderStrategy = new ClassLoaderStrategy.DefaultClassLoaderStrategy();
// ---------------------------------------------------------------- default class loader
/**
* Returns default class loader. By default, it is {@link #getContextClassLoader() threads context class loader}.
* If this one is null, then class loader of the caller class is returned.
*/
public static ClassLoader getDefaultClassLoader() {
ClassLoader cl = getContextClassLoader();
if (cl == null) {
final Class callerClass = ClassUtil.getCallerClass(2);
cl = callerClass.getClassLoader();
}
return cl;
}
/**
* Returns thread context class loader.
*/
public static ClassLoader getContextClassLoader() {
if (System.getSecurityManager() == null) {
return Thread.currentThread().getContextClassLoader();
}
else {
return AccessController.doPrivileged(
(PrivilegedAction) () -> Thread.currentThread().getContextClassLoader());
}
}
/**
* Returns system class loader.
*/
public static ClassLoader getSystemClassLoader() {
if (System.getSecurityManager() == null) {
return ClassLoader.getSystemClassLoader();
}
else {
return AccessController.doPrivileged(
(PrivilegedAction) ClassLoader::getSystemClassLoader);
}
}
// ---------------------------------------------------------------- classpath
private static final String[] MANIFESTS = {"Manifest.mf", "manifest.mf", "MANIFEST.MF"};
/**
* Returns classpath item manifest or null if not found.
*/
public static Manifest getClasspathItemManifest(final File classpathItem) {
Manifest manifest = null;
if (classpathItem.isFile()) {
FileInputStream fis = null;
try {
fis = new FileInputStream(classpathItem);
final JarFile jar = new JarFile(classpathItem);
manifest = jar.getManifest();
} catch (final IOException ignore) {
}
finally {
IOUtil.close(fis);
}
} else {
final File metaDir = new File(classpathItem, "META-INF");
File manifestFile = null;
if (metaDir.isDirectory()) {
for (final String m : MANIFESTS) {
final File mFile = new File(metaDir, m);
if (mFile.isFile()) {
manifestFile = mFile;
break;
}
}
}
if (manifestFile != null) {
FileInputStream fis = null;
try {
fis = new FileInputStream(manifestFile);
manifest = new Manifest(fis);
} catch (final IOException ignore) {
}
finally {
IOUtil.close(fis);
}
}
}
return manifest;
}
/**
* Returns base folder for classpath item. If item is a (jar) file,
* its parent is returned. If item is a directory, its name is returned.
*/
public static String getClasspathItemBaseDir(final File classpathItem) {
final String base;
if (classpathItem.isFile()) {
base = classpathItem.getParent();
} else {
base = classpathItem.toString();
}
return base;
}
// ---------------------------------------------------------------- class stream
/**
* Opens a class of the specified name for reading using class classloader.
*/
public static InputStream getClassAsStream(final Class clazz) throws IOException {
return ResourcesUtil.getResourceAsStream(ClassUtil.convertClassNameToFileName(clazz), clazz.getClassLoader());
}
/**
* Opens a class of the specified name for reading. No specific classloader is used
* for loading class.
*/
public static InputStream getClassAsStream(final String className) throws IOException {
return ResourcesUtil.getResourceAsStream(ClassUtil.convertClassNameToFileName(className));
}
/**
* Opens a class of the specified name for reading using provided class loader.
*/
public static InputStream getClassAsStream(final String className, final ClassLoader classLoader) throws IOException {
return ResourcesUtil.getResourceAsStream(ClassUtil.convertClassNameToFileName(className), classLoader);
}
// ---------------------------------------------------------------- load class
/**
* Loads a class using default class loader strategy.
* @see ClassLoaderStrategy.DefaultClassLoaderStrategy
*/
public static Class loadClass(final String className) throws ClassNotFoundException {
return classLoaderStrategy.loadClass(className, null);
}
/**
* Loads a class using default class loader strategy.
* @see ClassLoaderStrategy.DefaultClassLoaderStrategy
*/
public static Class loadClass(final String className, final ClassLoader classLoader) throws ClassNotFoundException {
return classLoaderStrategy.loadClass(className, classLoader);
}
// ---------------------------------------------------------------- class location
/**
* Returns location of the class. If class is not in a jar, it's classpath
* is returned; otherwise the jar location.
*/
public static String classLocation(final Class clazz) {
return clazz.getProtectionDomain().getCodeSource().getLocation().getPath();
}
}
