/***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
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* except in compliance with the License. You may obtain a copy of
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* implied. See the License for the specific language governing
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* Copyright (C) 2001-2004 Jan Arne Petersen <jpetersen@uni-bonn.de>
* Copyright (C) 2002 Benoit Cerrina <b.cerrina@wanadoo.fr>
* Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
* Copyright (C) 2004-2008 Thomas E Enebo <enebo@acm.org>
* Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
* Copyright (C) 2005 Charles O Nutter <headius@headius.com>
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package org.jruby.javasupport.bsf;
import java.util.Arrays;
import java.util.List;
import java.util.Vector;
import org.apache.bsf.BSFDeclaredBean;
import org.apache.bsf.BSFException;
import org.apache.bsf.BSFManager;
import org.apache.bsf.util.BSFEngineImpl;
import org.apache.bsf.util.BSFFunctions;
import org.jruby.Ruby;
import org.jruby.RubyRuntimeAdapter;
import org.jruby.exceptions.JumpException;
import org.jruby.exceptions.RaiseException;
import org.jruby.javasupport.Java;
import org.jruby.javasupport.JavaEmbedUtils;
import org.jruby.javasupport.JavaObject;
import org.jruby.javasupport.JavaUtil;
import org.jruby.runtime.DynamicScope;
import org.jruby.runtime.GlobalVariable;
import org.jruby.runtime.IAccessor;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
/**
* An implementation of a JRuby BSF implementation.
*/
public class JRubyEngine extends BSFEngineImpl {
private Ruby runtime;
private RubyRuntimeAdapter evaler = JavaEmbedUtils.newRuntimeAdapter();
@Override
public Object apply(String file, int line, int col, Object funcBody, Vector paramNames, Vector args) {
ThreadContext context = runtime.getCurrentContext();
try {
// Construct local variables based on parameter names passed in
String[] names = new String[paramNames.size()];
paramNames.toArray(names);
context.preBsfApply(names);
// Populate values for the parameter names
DynamicScope scope = context.getCurrentScope();
for (int i = 0, size = args.size(); i < size; i++) {
scope.setValue(i, JavaEmbedUtils.javaToRuby(runtime, args.get(i)), 0);
}
return JavaEmbedUtils.rubyToJava(evaler.parse(runtime, funcBody.toString(), file, line).run());
} catch (StackOverflowError soe) {
throw context.getRuntime().newSystemStackError("stack level too deep", soe);
} finally {
context.postBsfApply();
}
}
public Object eval(String file, int line, int col, Object expr) throws BSFException {
try {
return JavaEmbedUtils.rubyToJava(evaler.parse(runtime, expr.toString(), file, line).run());
} catch (Exception excptn) {
throw new BSFException(BSFException.REASON_EXECUTION_ERROR, "Exception", excptn);
}
}
@Override
public void exec(String file, int line, int col, Object expr) throws BSFException {
try {
evaler.parse(runtime, expr.toString(), file, line).run();
} catch (Exception excptn) {
throw new BSFException(BSFException.REASON_EXECUTION_ERROR, "Exception", excptn);
}
}
public Object call(Object recv, String method, Object[] args) throws BSFException {
try {
return JavaEmbedUtils.invokeMethod(runtime, recv, method, args, Object.class);
} catch (Exception excptn) {
throw new BSFException(BSFException.REASON_EXECUTION_ERROR, excptn.getMessage(), excptn);
}
}
@Override
public void initialize(BSFManager manager, String language, Vector someDeclaredBeans) throws BSFException {
super.initialize(manager, language, someDeclaredBeans);
runtime = JavaEmbedUtils.initialize(getClassPath(manager));
for (int i = 0, size = someDeclaredBeans.size(); i < size; i++) {
BSFDeclaredBean bean = (BSFDeclaredBean) someDeclaredBeans.elementAt(i);
runtime.getGlobalVariables().define(
GlobalVariable.variableName(bean.name),
new BeanGlobalVariable(runtime, bean));
}
runtime.getGlobalVariables().defineReadonly("$bsf", new FunctionsGlobalVariable(runtime, new BSFFunctions(manager, this)));
}
private List getClassPath(BSFManager manager) {
return Arrays.asList(manager.getClassPath().split(System.getProperty("path.separator")));
}
@Override
public void declareBean(BSFDeclaredBean bean) throws BSFException {
runtime.getGlobalVariables().define(
GlobalVariable.variableName(bean.name),
new BeanGlobalVariable(runtime, bean));
}
@Override
public void undeclareBean(BSFDeclaredBean bean) throws BSFException {
runtime.getGlobalVariables().set(GlobalVariable.variableName(bean.name), runtime.getNil());
}
public void handleException(BSFException bsfExcptn) {
printException(runtime, (Exception) bsfExcptn.getTargetException());
}
/**
*
* Prints out an error message.
*
* @param exception An Exception thrown by JRuby
*/
private static void printException(Ruby runtime, Exception exception) {
if (exception instanceof RaiseException) {
JumpException je = (JumpException)exception;
if (je instanceof RaiseException) {
runtime.printError(((RaiseException)je).getException());
} else if (je instanceof JumpException.BreakJump) {
runtime.getErrorStream().println("break without block.");
} else if (je instanceof JumpException.ReturnJump) {
runtime.getErrorStream().println("return without block.");
}
}
}
private static class BeanGlobalVariable implements IAccessor {
private Ruby runtime;
private BSFDeclaredBean bean;
public BeanGlobalVariable(Ruby runtime, BSFDeclaredBean bean) {
this.runtime = runtime;
this.bean = bean;
}
public IRubyObject getValue() {
IRubyObject result = JavaUtil.convertJavaToRuby(runtime, bean.bean, bean.type);
return result instanceof JavaObject ? Java.wrap(runtime, result) : result;
}
public IRubyObject setValue(IRubyObject value) {
bean.bean = value.toJava(Object.class);
return value;
}
}
private static class FunctionsGlobalVariable implements IAccessor {
private Ruby runtime;
private BSFFunctions functions;
public FunctionsGlobalVariable(Ruby runtime, BSFFunctions functions) {
this.runtime = runtime;
this.functions = functions;
}
public IRubyObject getValue() {
IRubyObject result = JavaUtil.convertJavaToRuby(runtime, functions, BSFFunctions.class);
return result instanceof JavaObject ? Java.wrap(runtime, result) : result;
}
public IRubyObject setValue(IRubyObject value) {
return value;
}
}
/**
* @see org.apache.bsf.BSFEngine#terminate()
*/
@Override
public void terminate() {
JavaEmbedUtils.terminate(runtime);
runtime = null;
super.terminate();
}
}