com.caucho.java.AbstractGenerator Maven / Gradle / Ivy
/*
* Copyright (c) 1998-2018 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;
import com.caucho.java.gen.DependencyComponent;
import com.caucho.java.gen.GenClass;
import com.caucho.loader.SimpleLoader;
import com.caucho.server.util.CauchoSystem;
import com.caucho.util.CharBuffer;
import com.caucho.vfs.IOExceptionWrapper;
import com.caucho.vfs.Path;
import com.caucho.vfs.PersistentDependency;
import com.caucho.vfs.WriteStream;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.ArrayList;
/**
* Generates the Java code for the wrapped object.
*/
public abstract class AbstractGenerator {
// The full name of the generated class
private String _fullClassName;
// The package of the generated class
private String _packageName;
// The class name of the generated class
private String _className;
// Parent class loader
private ClassLoader _parentLoader;
// class loader
private ClassLoader _loader;
// Write stream for generating the code
private WriteStream _os;
// The java writer
protected JavaWriter _out;
// The search path
private Path _searchPath;
// The work directory
private Path _workPath;
private GenClass _genClass;
private String _initMethod = "_caucho_init";
private String _isModifiedMethod = "_caucho_is_modified";
/**
* Sets the search path.
*/
public void setSearchPath(Path path)
{
_searchPath = path;
}
public Path getSearchPath()
{
return _searchPath;
}
/**
* Sets the full generated class.
*/
public void setFullClassName(String fullClassName)
{
CharBuffer cb = CharBuffer.allocate();
for (int i = 0; i < fullClassName.length(); i++) {
char ch = fullClassName.charAt(i);
if (ch == '.' || ch == '/')
cb.append('.');
else if (Character.isJavaIdentifierPart(ch))
cb.append(ch);
else
cb.append('_');
}
_fullClassName = cb.close();
int p = _fullClassName.lastIndexOf('.');
if (p > 0) {
_packageName = _fullClassName.substring(0, p);
_className = _fullClassName.substring(p + 1);
}
else {
_packageName = "";
_className = _fullClassName;
}
}
/**
* Returns the full class name
*/
public String getFullClassName()
{
if (_genClass != null)
return _genClass.getFullClassName();
else
return _fullClassName;
}
/**
* Returns the generated package name
*/
public String getPackageName()
{
if (_genClass != null)
return _genClass.getPackageName();
else
return _packageName;
}
/**
* Returns the generated class name
*/
public String getClassName()
{
if (_genClass != null)
return _genClass.getClassName();
else
return _className;
}
/**
* Sets the java class.
*/
public void setGenClass(GenClass genClass)
{
_genClass = genClass;
}
/**
* Gets the java class.
*/
public GenClass getGenClass()
{
return _genClass;
}
/**
* Sets the parent class loader.
*
* @param loader parent class loader
*/
public void setParentLoader(ClassLoader loader)
{
_parentLoader = loader;
}
/**
* Sets the class loader.
*
* @param loader parent class loader
*/
public void setLoader(ClassLoader loader)
{
_loader = 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 work path for the generated class.
*/
public void setClassDir(Path workPath)
{
_workPath = workPath;
}
/**
* Returns the class dir for the generated class.
*/
public Path getClassDir()
{
if (_workPath == null)
return WorkDir.getLocalWorkDir();
else
return _workPath;
}
/**
* Try to preload the class.
*
* @return true if the preloaded class is still valid.
*/
public Class preload()
throws IOException
{
return loadClass(true);
}
/**
* Call to generate the java source.
*/
public void generate()
throws Exception
{
String className = getFullClassName();
String javaPathName = className.replace('.', '/') + ".java";
String classPathName = className.replace('.', '/') + ".class";
Path javaPath = getClassDir().lookup(javaPathName);
Path classPath = getClassDir().lookup(classPathName);
try {
classPath.remove();
} catch (IOException e) {
}
javaPath.getParent().mkdirs();
_os = javaPath.openWrite();
_out = new JavaWriter(_os);
if (_genClass != null)
_genClass.generate(_out);
else
generateJava();
_os.close();
}
/**
* Compiles the Java code
*/
public Class compile()
throws Exception
{
compileJava();
return loadClass(false);
}
/**
* Starts generation of the Java code
*/
public void generateJava()
throws Exception
{
}
/**
* Generates the class dependency code.
*
* @param depends list of Paths representing dependencies
*/
protected void printDependList(ArrayList depends)
throws IOException
{
DependencyComponent depend = new DependencyComponent();
depend.setSearchPath(_searchPath);
for (int i = 0; i < depends.size(); i++)
depend.addDependency(depends.get(i));
depend.generate(getOut());
}
/**
* Prints a method header.
*
* @param method the method to print
*/
public void printMethodHeader(Method method)
throws IOException
{
printMethodHeader(method.getName(), method.getParameterTypes(),
method.getReturnType(), method.getExceptionTypes());
}
/**
* Prints a method header.
*
* @param name the method name to print
* @param method the method to print
*/
public void printMethodHeader(String name, Method method)
throws IOException
{
printMethodHeader(name, method.getParameterTypes(),
method.getReturnType(), method.getExceptionTypes());
}
/**
* Prints a method header.
*
* @param methodName the method name to print
* @param param the method argument classes
* @param returnType the return type of the method
* @param exn array of exceptions thrown by the method
*/
public void printMethodHeader(String methodName, Class []parameters,
Class returnType, Class []exn)
throws IOException
{
println();
print("public ");
printClass(returnType);
print(" ");
print(methodName);
print("(");
for (int i = 0; i < parameters.length; i++) {
if (i != 0)
print(", ");
printClass(parameters[i]);
print(" a" + i);
}
println(")");
if (exn != null && exn.length > 0) {
print(" throws ");
printClass(exn[0]);
for (int i = 1; i < exn.length; i++) {
print(", ");
printClass(exn[i]);
}
println();
}
}
/**
* Prints the Java represention of the class
*/
public void printClass(Class cl)
throws IOException
{
if (! cl.isArray())
print(cl.getName().replace('$', '.'));
else {
printClass(cl.getComponentType());
print("[]");
}
}
/**
* Compiles the class.
*/
public void compileJava()
throws IOException, ClassNotFoundException
{
JavaCompilerUtil compiler = getCompiler();
compiler.compile(getFullClassName().replace('.', '/') + ".java", null);
}
public JavaCompilerUtil getCompiler()
{
JavaCompilerUtil compiler = JavaCompilerUtil.create(getParentLoader());
compiler.setClassLoader(getParentLoader());
compiler.setClassDir(getClassDir());
return compiler;
}
/**
* Loads the generated class. If any class dependencies have
* changed, return null.
*/
public Class loadClass(boolean preload)
throws IOException
{
return loadClass(getFullClassName(), preload);
}
/**
* Loads the generated class. If any class dependencies have
* changed, return null.
*/
public Class loadClass(String fullClassName, boolean preload)
throws IOException
{
try {
ClassLoader loader;
if (! preload && _loader != null)
loader = _loader;
else {
loader = SimpleLoader.create(getParentLoader(),
getClassDir(),
fullClassName);
}
Class cl = CauchoSystem.loadClass(fullClassName, false, loader);
if (cl == null)
return null;
if (! preload)
return cl;
Method method = cl.getMethod(_initMethod, new Class[] { Path.class });
method.invoke(null, new Object[] { getSearchPath() });
method = cl.getMethod(_isModifiedMethod, new Class[0]);
Boolean value = (Boolean) method.invoke(null, new Object[] {});
if (value.booleanValue())
return null;
if (_loader != null)
loader = _loader;
else {
loader = SimpleLoader.create(getParentLoader(),
getClassDir(),
fullClassName);
}
return CauchoSystem.loadClass(fullClassName, false, loader);
} catch (Throwable e) {
if (! preload)
throw new IOExceptionWrapper(e);
else
return null;
}
}
/**
* Returns the java writer.
*/
public JavaWriter getOut()
{
return _out;
}
/**
* Pushes an indentation depth.
*/
public void pushDepth()
throws IOException
{
_out.pushDepth();
}
/**
* Pops an indentation depth.
*/
public void popDepth()
throws IOException
{
_out.popDepth();
}
/**
* Prints a character
*/
public void print(int ch)
throws IOException
{
_out.print(ch);
}
/**
* Prints a character
*/
public void print(char ch)
throws IOException
{
_out.print(ch);
}
/**
* Prints a string
*/
public void print(String s)
throws IOException
{
_out.print(s);
}
/**
* Prints a string
*/
public void printStr(String s)
throws IOException
{
int len = s.length();
for (int i = 0; i < len; i++) {
char ch = s.charAt(i);
switch (ch) {
case '\\':
_out.print("\\\\");
break;
case '\n':
_out.print("\\n");
break;
case '\r':
_out.print("\\r");
break;
case '"':
_out.print("\\\"");
break;
default:
_out.print(ch);
}
}
}
/**
* Prints a new line.
*/
public void println()
throws IOException
{
_out.println();
}
/**
* Prints a string with a new line
*/
public void println(String s)
throws IOException
{
_out.println(s);
}
}
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