/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.java.gen;
import com.caucho.java.JavaCompiler;
import com.caucho.java.JavaWriter;
import com.caucho.loader.DynamicClassLoader;
import com.caucho.loader.SimpleLoader;
import com.caucho.loader.enhancer.EnhancingClassLoader;
import com.caucho.server.util.CauchoSystem;
import com.caucho.util.CharBuffer;
import com.caucho.util.L10N;
import com.caucho.vfs.MergePath;
import com.caucho.vfs.Path;
import com.caucho.vfs.Vfs;
import com.caucho.vfs.WriteStream;
import java.io.IOException;
import java.lang.reflect.Method;
import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Factory for generating Java classes.
*/
public class JavaClassGenerator {
private static final L10N L = new L10N(JavaClassGenerator.class);
private static final Logger log
= Logger.getLogger(JavaClassGenerator.class.getName());
// Parent class loader
private ClassLoader _parentLoader;
// class loader
private ClassLoader _loader;
private String _encoding;
// The search path
private Path _searchPath;
// The work directory
private Path _workPath;
private ArrayList<String> _pendingFiles = new ArrayList<String>();
private String _initMethod = "_caucho_init";
private String _isModifiedMethod = "_caucho_is_modified";
/**
* Sets the full generated class.
*/
public static String cleanClassName(String className)
{
StringBuilder cb = new StringBuilder();
for (int i = 0; i < className.length(); i++) {
char ch = className.charAt(i);
if (ch == '.' || ch == '/')
cb.append('.');
else if (Character.isJavaIdentifierPart(ch))
cb.append(ch);
else
cb.append('_');
}
return cb.toString();
}
/**
* Returns the default merge path
*/
public static Path getDefaultSearchPath()
{
MergePath mergePath = new MergePath();
mergePath.addMergePath(Vfs.lookup());
mergePath.addClassPath();
return mergePath;
}
/**
* Sets the search path.
*/
public void setSearchPath(Path path)
{
_searchPath = path;
}
/**
* Returns the assigned search path.
*/
public Path getSearchPath()
{
return _searchPath;
}
public void setEncoding(String encoding)
{
_encoding = encoding;
}
/**
* Sets the parent class loader.
*
* @param loader parent class loader
*/
public void setParentLoader(ClassLoader loader)
{
if (loader instanceof EnhancingClassLoader) {
EnhancingClassLoader enhancingLoader = (EnhancingClassLoader) loader;
}
_parentLoader = loader;
}
/**
* Sets the class loader.
*
* @param loader parent class loader
*/
public void setLoader(ClassLoader loader)
{
_loader = loader;
}
/**
* Gets the class loader.
*/
public ClassLoader getClassLoader()
{
return _loader;
/*
if (_loader == null) {
_loader = SimpleLoader.create(getParentLoader(),
getWorkDir());
}
return _loader;
*/
}
/**
* Sets the parent class loader.
*
* @return the parent class loader
*/
public ClassLoader getParentLoader()
{
if (_parentLoader == null)
_parentLoader = Thread.currentThread().getContextClassLoader();
return _parentLoader;
}
/**
* Sets the parent class loader.
*
* @return the parent class loader
*/
public ClassLoader getPreloadLoader()
{
return Thread.currentThread().getContextClassLoader();
/*
if (_preloadLoader instanceof EnhancingClassLoader) {
EnhancingClassLoader enhancingLoader;
enhancingLoader = (EnhancingClassLoader) _preloadLoader;
_preloadLoader = enhancingLoader.getRawLoader();
}
*/
}
/**
* Sets the work path for the generated class.
*/
public void setWorkDir(Path workPath)
{
_workPath = workPath;
}
/**
* Returns the class dir for the generated class.
*/
public Path getWorkDir()
{
if (_workPath == null)
return CauchoSystem.getWorkPath();
else
return _workPath;
}
/**
* Try to preload the class.
*
* @return true if the preloaded class is still valid.
*/
public Class<?> preload(String fullClassName)
{
try {
Class<?> cl = loadClass(fullClassName, true);
if (cl != null) {
// force validation of the class
Constructor<?> []ctors = cl.getConstructors();
}
return cl;
} catch (ClassNotFoundException e) {
log.log(Level.FINEST, e.toString(), e);
return null;
} catch (ClassFormatError e) {
log.log(Level.FINEST, e.toString(), e);
return null;
}
}
/**
* Try to preload the class.
*
* @return true if the preloaded class is still valid.
*/
public Class<?> load(String fullClassName)
{
try {
Class<?> cl = loadClass(fullClassName, false);
if (cl != null) {
// force validation of the class
Constructor<?> []ctors = cl.getConstructors();
}
return cl;
} catch (ClassNotFoundException e) {
log.log(Level.FINEST, e.toString(), e);
return null;
} catch (ClassFormatError e) {
log.log(Level.FINEST, e.toString(), e);
return null;
}
}
public Path getClassFilePath(String className)
{
String classPathName = className.replace('.', '/') + ".class";
return getWorkDir().lookup(classPathName);
}
/**
* Call to generate the java source.
*/
public void generate(GenClass javaClass)
throws Exception
{
String className = javaClass.getFullClassName();
String javaPathName = className.replace('.', '/') + ".java";
String classPathName = className.replace('.', '/') + ".class";
Path javaPath = getWorkDir().lookup(javaPathName);
Path classPath = getWorkDir().lookup(classPathName);
try {
classPath.remove();
} catch (IOException e) {
}
javaPath.getParent().mkdirs();
WriteStream os = javaPath.openWrite();
try {
if (_encoding != null)
os.setEncoding(_encoding);
else
os.setEncoding("JAVA");
JavaWriter out = new JavaWriter(os);
javaClass.generate(out);
} finally {
os.close();
}
_pendingFiles.add(javaPathName);
}
public void addPendingFile(String javaPath)
{
_pendingFiles.add(javaPath);
}
/**
* Compiles the Java code
*/
public Class compile(String fullClassName)
throws Exception
{
compileJava(fullClassName);
return loadClass(fullClassName, false);
}
/**
* Compiles the class.
*/
public void compileJava(String fullClassName)
throws IOException, ClassNotFoundException
{
JavaCompiler compiler = JavaCompiler.create(getPreloadLoader());
compiler.setClassLoader(getPreloadLoader());
compiler.setClassDir(getWorkDir());
if (_encoding != null)
compiler.setEncoding(_encoding);
compiler.compile(fullClassName.replace('.', '/') + ".java", null);
}
/**
* Returns the pending Java files.
*/
public String []getPendingFiles()
{
String []files = new String[_pendingFiles.size()];
_pendingFiles.toArray(files);
_pendingFiles.clear();
return files;
}
public void addPendingFiles(String []files)
{
for (String file : files) {
_pendingFiles.add(file);
}
}
/**
* Compiles the pending files
*/
public void compilePendingJava()
throws IOException, ClassNotFoundException
{
JavaCompiler compiler = JavaCompiler.create(getPreloadLoader());
compiler.setClassLoader(getPreloadLoader());
compiler.setClassDir(getWorkDir());
if (_encoding != null)
compiler.setEncoding(_encoding);
String []files = new String[_pendingFiles.size()];
_pendingFiles.toArray(files);
_pendingFiles.clear();
compiler.compileBatch(files);
}
/**
* Loads the generated class. If any class dependencies have
* changed, return null.
*/
public Class<?> loadClass(String fullClassName)
throws ClassNotFoundException
{
return loadClass(fullClassName, false);
}
/**
* Checks if the preload exists
*/
public boolean preloadExists(String fullClassName)
{
Path workDir = getWorkDir();
String classFile = fullClassName.replace('.', '/') + ".class";
return workDir.lookup(classFile).exists();
}
/**
* Loads the generated class. If any class dependencies have
* changed, return null.
*/
public Class<?> loadClass(String fullClassName, boolean preload)
throws ClassNotFoundException
{
DynamicClassLoader preloadLoader = null;
try {
ClassLoader loader;
if (preload) {
preloadLoader = SimpleLoader.create(getPreloadLoader(),
getWorkDir(),
fullClassName);
// needed for cases like Amber enhancing
preloadLoader.setServletHack(true);
loader = preloadLoader;
}
else {
// XXX: because of automatic instantiation, might cause trouble
loader = getClassLoader();
if (loader == null) {
loader = SimpleLoader.create(getParentLoader(),
getWorkDir(),
fullClassName);
}
}
Class<?> cl = Class.forName(fullClassName, false, loader);
if (cl == null)
return null;
if (! preload)
return cl;
if (isModified(cl)) {
return null;
}
if (_loader != null)
loader = _loader;
else {
loader = SimpleLoader.create(getParentLoader(),
getWorkDir(),
fullClassName);
}
cl = Class.forName(fullClassName, false, loader);
return cl;
} catch (RuntimeException e) {
if (! preload)
throw e;
else {
log.log(Level.FINE, e.toString(), e);
return null;
}
} catch (Error e) {
if (! preload)
throw e;
else {
log.log(Level.FINE, e.toString(), e);
return null;
}
} catch (ClassNotFoundException e) {
if (! preload)
throw e;
else
return null;
} finally {
if (preloadLoader != null)
preloadLoader.destroy();
}
}
/**
* Loads the generated class into the parent loader.
*/
public Class<?> preloadClassParentLoader(String fullClassName,
Class<?> parentClass)
{
try {
Class<?> cl = loadClassParentLoader(fullClassName, parentClass);
if (! isModified(cl))
return cl;
else
return null;
} catch (ClassNotFoundException e) {
log.log(Level.ALL, e.toString(), e);
return null;
}
}
/**
* Loads the generated class into the parent loader.
*/
public Class<?> loadClassParentLoader(String fullClassName,
Class<?> parentClass)
throws ClassNotFoundException
{
ClassLoader parentLoader = parentClass.getClassLoader();
if (! (parentLoader instanceof DynamicClassLoader)) {
throw new IllegalStateException(parentClass + " must belong to a Resin class loader " + parentLoader);
}
DynamicClassLoader dynParentLoader
= (DynamicClassLoader) parentLoader;
SimpleLoader simpleLoader
= new SimpleLoader(dynParentLoader, getWorkDir(), fullClassName);
simpleLoader.init();
try {
return Class.forName(fullClassName, false, dynParentLoader);
} finally {
// XXX: parentLoader.removeLoader(simpleLoader);
}
}
/**
* Returns true if the class is modified.
*/
public boolean isModified(Class<?> cl)
{
Path searchPath = getSearchPath();
if (searchPath == null)
searchPath = getDefaultSearchPath();
Thread thread = Thread.currentThread();
ClassLoader oldLoader = thread.getContextClassLoader();
try {
if (_parentLoader != null)
thread.setContextClassLoader(_parentLoader);
Method method = cl.getMethod(_initMethod, new Class[] { Path.class });
method.invoke(null, new Object[] { searchPath });
method = cl.getMethod(_isModifiedMethod, new Class[0]);
Boolean value = (Boolean) method.invoke(null, new Object[] {});
return value.booleanValue();
} catch (NoSuchMethodException e) {
return false;
} catch (Throwable e) {
log.warning(e.toString());
return true;
} finally {
thread.setContextClassLoader(oldLoader);
}
}
}