com.codename1.impl.javase.ClassPathLoader Maven / Gradle / Ivy
/*
* Copyright (c) 2012, Codename One and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Codename One designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Codename One through http://www.codenameone.com/ if you
* need additional information or have any questions.
*/
package com.codename1.impl.javase;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.URL;
import java.util.*;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
/**
* Class loader for the given classpath
*
* @author Shai Almog
*/
class ClassPathLoader extends ClassLoader {
private File[] classpath;
private Map classes = new HashMap();
private Map resources = new HashMap<>();
private List excludes = new ArrayList();
{
excludes.add("com.apple.laf");
excludes.add("com.github.sarxos.webcam");
excludes.add("org.bridj");
excludes.add("java");
excludes.add("com.sun");
excludes.add("org.jdesktop");
excludes.add("netscape.javascript");
excludes.add("javafx");
excludes.add("org.sqlite");
excludes.add("org.w3c");
}
private List includes = new ArrayList();
{
//includes.add("com.sun.javafx");
}
public ClassPathLoader(File[] classpath) {
this(ClassPathLoader.class.getClassLoader(), classpath);
}
public ClassPathLoader(ClassLoader parent, File[] classpath) {
super(parent);
this.classpath = classpath;
}
public void addExclude(String exclude) {
excludes.add(exclude);
}
public void addInclude(String include) {
includes.add(include);
}
public void removeInclude(String include) {
includes.remove(include);
}
private boolean isExcluded(String className) {
//if (isIncluded(className)) {
// return false;
//}
for (String prefix : excludes) {
if (className.startsWith(prefix)) {
return true;
}
}
return false;
}
private boolean isIncluded(String className) {
for (String prefix : includes) {
if (className.startsWith(prefix)) {
return true;
}
}
return false;
}
public Class loadClass(String className) throws ClassNotFoundException {
if (isExcluded(className)) {
return super.loadClass(className);
}
return findClass(className);
}
@Override
protected Class loadClass(String className, boolean resolve) throws ClassNotFoundException {
if (isExcluded(className)) {
return super.loadClass(className, resolve);
}
return findClass(className);
}
@Override
protected String findLibrary(String libname) {
String out = super.findLibrary(libname);
if (out == null) {
for (String libDir : System.getProperty("cn1.library.path", "").split(File.pathSeparator)) {
if (isMac) {
File f = new File(libDir, "lib" + libname + ".dylib");
if (f.exists()) {
return f.getAbsolutePath();
}
f = new File(libDir, "lib" + libname + ".jnilib");
if (f.exists()) {
return f.getAbsolutePath();
}
} else if (isWindows) {
File f = new File(libDir, libname + ".dll");
if (f.exists()) {
return f.getAbsolutePath();
}
f = new File(libDir, libname + ".jnilib");
if (f.exists()) {
return f.getAbsolutePath();
}
} else {
File f = new File(libDir, libname + ".so");
if (f.exists()) {
return f.getAbsolutePath();
}
f = new File(libDir, "lib" + libname + ".so");
if (f.exists()) {
return f.getAbsolutePath();
}
f = new File(libDir, libname + ".jnilib");
if (f.exists()) {
return f.getAbsolutePath();
}
}
}
}
return out;
}
/*
Tried to override findResource to support JavaFX, but was dismal failure. Commenting out.
@Override
protected URL findResource(String name) {
URL result = super.findResource(name);
if (result == null && !name.endsWith(".dylib")) {
System.out.println("Looking for resource "+name);
result = (URL) resources.get(name); //checks in cached classes
if (result != null) {
return result;
}
try {
for (File f : classpath) {
//InputStream is;
if (f.isDirectory()) {
File current = new File(f, name);
if (!current.exists()) {
continue;
}
result = current.toURI().toURL();
} else {
try {
JarFile jar = new JarFile(f);
JarEntry entry = jar.getJarEntry(name);
if (entry == null) {
continue;
}
result = new URL("jar:" + f.toURI().toURL() + "!/" + name);
InputStream is = result.openStream();
System.out.println("Opening "+result+" resulted in stream "+is);
} catch (Throwable t) {
continue;
}
}
resources.put(name, result);
System.out.println("returning "+result);
return result;
}
} catch (Exception e) {
}
}
return result;
}
*/
public Class findClass(String className) throws ClassNotFoundException {
byte[] classByte;
Class result = null;
result = (Class) classes.get(className); //checks in cached classes
if (result != null) {
return result;
}
try {
for (File f : classpath) {
InputStream is;
if (f.isDirectory()) {
File current = new File(f, className.replace('.', File.separatorChar) + ".class");
if (!current.exists()) {
continue;
}
is = new FileInputStream(current);
} else {
try {
JarFile jar = new JarFile(f);
JarEntry entry = jar.getJarEntry(className.replace('.', '/') + ".class");
if (entry == null) {
continue;
}
is = jar.getInputStream(entry);
if (is == null) {
continue;
}
} catch (Throwable t) {
continue;
}
}
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
int nextValue = is.read();
while (-1 != nextValue) {
byteStream.write(nextValue);
nextValue = is.read();
}
is.close();
classByte = byteStream.toByteArray();
result = defineClass(className, classByte, 0, classByte.length, null);
classes.put(className, result);
return result;
}
} catch (Exception e) {
}
return findSystemClass(className);
}
private Set resourceMisses = new HashSet<>();
@Override
public URL getResource(String name) {
if (resources.containsKey(name)) {
return resources.get(name);
} else if (resourceMisses.contains(name) && getParent() != null) {
return getParent().getResource(name);
} else {
URL url = findResource(name);
if (url == null) {
resourceMisses.add(name);
return null;
} else {
resources.put(name, url);
return url;
}
}
}
@Override
protected URL findResource(String name) {
for (File f : classpath) {
if (f.isDirectory()) {
File current = new File(f, name);
if (current.exists()) {
try {
return current.toURI().toURL();
} catch (Exception ex){
ex.printStackTrace();
}
}
} else {
try {
JarFile jar = new JarFile(f);
JarEntry entry = jar.getJarEntry(name);
if (entry == null) {
continue;
}
File entryFile = new File(new File(f.getParentFile(), f.getName()+"!"), name);
return new URL("jar:"+entryFile.toURI().toURL());
} catch (Throwable t) {
continue;
}
}
}
return null;
}
private static String OS = System.getProperty("os.name").toLowerCase();
private static boolean isWindows = (OS.indexOf("win") >= 0);
private static boolean isMac = (OS.indexOf("mac") >= 0);
private static boolean isUnix = (OS.indexOf("nux") >= 0);
}
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