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BEGIN LICENSE BLOCK ***** Version: EPL 1.0/GPL 2.0/LGPL 2.1 The contents of this file are subject to the Eclipse Public License Version 1.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.eclipse.org/legal/epl-v10.html Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License. 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> Alternatively, the contents of this file may be used under the terms of either of the GNU General Public License Version 2 or later (the "GPL"), or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which case the provisions of the GPL or the LGPL are applicable instead of those above. If you wish to allow use of your version of this file only under the terms of either the GPL or the LGPL, and not to allow others to use your version of this file under the terms of the EPL, indicate your decision by deleting the provisions above and replace them with the notice and other provisions required by the GPL or the LGPL. If you do not delete the provisions above, a recipient may use your version of this file under the terms of any one of the EPL, the GPL or the LGPL. END LICENSE BLOCK ***
 
 package org.jruby.javasupport.bsf;
 
 import java.util.List;
 
 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;
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 fileint lineint colObject funcBodyVector paramNamesVector args) {
         ThreadContext context = .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 < sizei++) {
                 scope.setValue(i, JavaEmbedUtils.javaToRuby(args.get(i)), 0);
             }
 
             return JavaEmbedUtils.rubyToJava(.parse(funcBody.toString(), fileline).run());
         } catch (StackOverflowError soe) {
             throw context.runtime.newSystemStackError("stack level too deep"soe);
         } finally {
             context.postBsfApply();
         }
     }
 
     public Object eval(String fileint lineint colObject exprthrows BSFException {
         try {
             return JavaEmbedUtils.rubyToJava(.parse(expr.toString(), fileline).run());
         } catch (Exception excptn) {
             throw new BSFException(BSFException.REASON_EXECUTION_ERROR, "Exception"excptn);
         }
     }
 
     @Override
     public void exec(String fileint lineint colObject exprthrows BSFException {
         try {
             .parse(expr.toString(), fileline).run();
        } catch (Exception excptn) {
            throw new BSFException(BSFException.REASON_EXECUTION_ERROR, "Exception"excptn);
        }
    }
    public Object call(Object recvString methodObject[] argsthrows BSFException {
        try {
        	return JavaEmbedUtils.invokeMethod(recvmethodargsObject.class);
        } catch (Exception excptn) {
            throw new BSFException(BSFException.REASON_EXECUTION_ERROR, excptn.getMessage(), excptn);
        }
    }
    @Override
    public void initialize(BSFManager managerString languageVector someDeclaredBeansthrows BSFException {
        super.initialize(managerlanguagesomeDeclaredBeans);
         = JavaEmbedUtils.initialize(getClassPath(manager));
        for (int i = 0, size = someDeclaredBeans.size(); i < sizei++) {
            BSFDeclaredBean bean = (BSFDeclaredBean) someDeclaredBeans.elementAt(i);
            .getGlobalVariables().define(
                    GlobalVariable.variableName(bean.name),
                    new BeanGlobalVariable(bean),
                    ......);
        }
        .getGlobalVariables().defineReadonly("$bsf"new FunctionsGlobalVariable(new BSFFunctions(managerthis)), ......);
    }
    
    private List getClassPath(BSFManager manager) {
    	return Arrays.asList(manager.getClassPath().split(System.getProperty("path.separator")));
    }
    @Override
    public void declareBean(BSFDeclaredBean beanthrows BSFException {
                GlobalVariable.variableName(bean.name),
                new BeanGlobalVariable(bean),
                ......);
    }
    @Override
    public void undeclareBean(BSFDeclaredBean beanthrows BSFException {
        .getGlobalVariables().set(GlobalVariable.variableName(bean.name), .getNil());
    }
    public void handleException(BSFException bsfExcptn) {
        printException(, (ExceptionbsfExcptn.getTargetException());
    }

    
Prints out an error message.

Parameters:
exception An Exception thrown by JRuby
    private static void printException(Ruby runtimeException 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 final Ruby runtime;
        private final BSFDeclaredBean bean;
        public BeanGlobalVariable(Ruby runtime, BSFDeclaredBean bean) {
            this. = runtime;
            this. = bean;
        }
        public IRubyObject getValue() {
            IRubyObject result = JavaUtil.convertJavaToRuby(..);
            
            return result instanceof JavaObject ? Java.wrap(result) : result;
        }
        public IRubyObject setValue(IRubyObject value) {
            . = value.toJava(Object.class);
            return value;
        }
    }
    private static class FunctionsGlobalVariable implements IAccessor {
        private final Ruby runtime;
        private final BSFFunctions functions;
        public FunctionsGlobalVariable(Ruby runtime, BSFFunctions functions) {
            this. = runtime;
            this. = functions;
        }
        public IRubyObject getValue() {
            IRubyObject result = JavaUtil.convertJavaToRuby(, BSFFunctions.class);
            return result instanceof JavaObject ? Java.wrap(result) : result;
        }
        public IRubyObject setValue(IRubyObject value) {
            return value;
        }
    }

    

See also:
org.apache.bsf.BSFEngine.terminate()
    @Override
    public void terminate() {
    	JavaEmbedUtils.terminate();
         = null;
        super.terminate();
    }
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