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* and Distribution License("CDDL") (collectively, the "License"). You
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* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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package com.sun.tools.xjc.api.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.MalformedURLException;
import com.sun.istack.Nullable;
/**
* {@link ClassLoader} that loads Annotation Processing and specified classes
* both into the same classloader, so that they can reference each other.
*
* @author Bhakti Mehta
* @since 2.0 beta
*/
public final class ApClassLoader extends URLClassLoader {
/**
* List of package prefixes we want to mask the
* parent classLoader from loading
*/
private final String[] packagePrefixes;
/**
*
* @param packagePrefixes
* The package prefixes that are forced to resolve within this class loader.
* @param parent
* The parent class loader to delegate to. Null to indicate bootstrap classloader.
*/
public ApClassLoader(@Nullable ClassLoader parent, String[] packagePrefixes) throws ToolsJarNotFoundException {
super(getToolsJar(parent),parent);
if(getURLs().length==0)
// if tools.jar was found in our classloader, no need to create
// a parallel classes
this.packagePrefixes = new String[0];
else
this.packagePrefixes = packagePrefixes;
}
public Class loadClass(String className) throws ClassNotFoundException {
for( String prefix : packagePrefixes ) {
if (className.startsWith(prefix) ) {
// we need to load those classes in this class loader
// without delegation.
return findClass(className);
}
}
return super.loadClass(className);
}
protected Class findClass(String name) throws ClassNotFoundException {
StringBuilder sb = new StringBuilder(name.length() + 6);
sb.append(name.replace('.','/')).append(".class");
InputStream is = getResourceAsStream(sb.toString());
if (is==null)
throw new ClassNotFoundException("Class not found" + sb);
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
int len;
while((len=is.read(buf))>=0)
baos.write(buf,0,len);
buf = baos.toByteArray();
// define package if not defined yet
int i = name.lastIndexOf('.');
if (i != -1) {
String pkgname = name.substring(0, i);
Package pkg = getPackage(pkgname);
if(pkg==null)
definePackage(pkgname, null, null, null, null, null, null, null);
}
return defineClass(name,buf,0,buf.length);
} catch (IOException e) {
throw new ClassNotFoundException(name,e);
} finally {
try {
is.close();
} catch (IOException ioe) {
//ignore
}
}
}
/**
* Returns a class loader that can load classes from JDK tools.jar.
* @param parent
*/
private static URL[] getToolsJar(@Nullable ClassLoader parent) throws ToolsJarNotFoundException {
try {
Class.forName("com.sun.tools.javac.Main", false, parent);
return new URL[0];
// we can already load them in the parent class loader.
// so no need to look for tools.jar.
// this happens when we are run inside IDE/Ant, or
// in Mac OS.
} catch (ClassNotFoundException e) {
// otherwise try to find tools.jar
}
File jreHome = new File(System.getProperty("java.home"));
File toolsJar = new File( jreHome.getParent(), "lib/tools.jar" );
if (!toolsJar.exists()) {
throw new ToolsJarNotFoundException(toolsJar);
}
try {
return new URL[]{toolsJar.toURL()};
} catch (MalformedURLException e) {
// impossible
throw new AssertionError(e);
}
}
}
