| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (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.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.bsf.engines.javaclass; |
| |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| |
| import org.apache.bsf.BSFException; |
| import org.apache.bsf.util.BSFEngineImpl; |
| import org.apache.bsf.util.MethodUtils; |
| |
| /** |
| * This is the interface to scripts consisting of Java objects from the |
| * Bean Scripting Framework. |
| * |
| * @author Sanjiva Weerawarana |
| */ |
| public class JavaClassEngine extends BSFEngineImpl { |
| /** |
| * call the named method of the given object. If object is an instance |
| * of Class, then the call is a static call on that object. If not, its |
| * an instance method call or a static call (as per Java) on the given |
| * object. |
| */ |
| public Object call (Object object, String method, Object[] args) |
| throws BSFException { |
| // determine arg types |
| Class[] argTypes = null; |
| if (args != null) { |
| argTypes = new Class[args.length]; |
| for (int i = 0; i < args.length; i++) { |
| argTypes[i] = (args[i] != null) ? args[i].getClass () : null; |
| } |
| } |
| |
| // now find method with the right signature, call it and return result |
| try { |
| Method m = MethodUtils.getMethod (object, method, argTypes); |
| return m.invoke (object, args); |
| } catch (Exception e) { |
| // something went wrong while invoking method |
| Throwable t = (e instanceof InvocationTargetException) ? |
| ((InvocationTargetException)e).getTargetException () : |
| null; |
| throw new BSFException (BSFException.REASON_OTHER_ERROR, |
| "method invocation failed: " + e + |
| ((t==null)?"":(" target exception: "+t)), t); |
| } |
| } |
| /** |
| * This is used by an application to evaluate an object containing |
| * some expression - clearly not possible for compiled code .. |
| */ |
| public Object eval (String source, int lineNo, int columnNo, |
| Object oscript) throws BSFException { |
| throw new BSFException (BSFException.REASON_UNSUPPORTED_FEATURE, |
| "Java bytecode engine can't evaluate expressions"); |
| } |
| } |