| /* |
| * 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.tools.ant.util.optional; |
| |
| import org.apache.tools.ant.BuildException; |
| |
| |
| import java.util.Iterator; |
| import org.apache.tools.ant.util.ScriptRunnerBase; |
| import org.apache.tools.ant.util.ReflectUtil; |
| import org.apache.tools.ant.util.ReflectWrapper; |
| |
| /** |
| * This class is used to run scripts using JSR 223. |
| * @since Ant 1.7.0 |
| */ |
| public class JavaxScriptRunner extends ScriptRunnerBase { |
| private ReflectWrapper engine; |
| |
| /** |
| * Get the name of the manager prefix. |
| * @return "javax" |
| */ |
| public String getManagerName() { |
| return "javax"; |
| } |
| |
| /** {@inheritDoc}. */ |
| public boolean supportsLanguage() { |
| if (engine != null) { |
| return true; |
| } |
| checkLanguage(); |
| ClassLoader origLoader = replaceContextLoader(); |
| try { |
| return createEngine() != null; |
| } catch (Exception ex) { |
| return false; |
| } finally { |
| restoreContextLoader(origLoader); |
| } |
| } |
| |
| /** |
| * Do the work to run the script. |
| * |
| * @param execName the name that will be passed to the |
| * scripting engine for this script execution. |
| * |
| * @exception BuildException if someting goes wrong exectuing the script. |
| */ |
| public void executeScript(String execName) throws BuildException { |
| evaluateScript(execName); |
| } |
| |
| /** |
| * Do the work to eval the script. |
| * |
| * @param execName the name that will be passed to the |
| * scripting engine for this script execution. |
| * @return the result of the evaluation |
| * @exception BuildException if something goes wrong executing the script. |
| */ |
| public Object evaluateScript(String execName) throws BuildException { |
| checkLanguage(); |
| ClassLoader origLoader = replaceContextLoader(); |
| try { |
| ReflectWrapper engine = createEngine(); |
| if (engine == null) { |
| throw new BuildException( |
| "Unable to create javax script engine for " |
| + getLanguage()); |
| } |
| for (Iterator i = getBeans().keySet().iterator(); i.hasNext();) { |
| String key = (String) i.next(); |
| Object value = getBeans().get(key); |
| if ("FX".equalsIgnoreCase(getLanguage())) { |
| engine.invoke( |
| "put", String.class, key |
| + ":" + value.getClass().getName(), |
| Object.class, value); |
| } else { |
| engine.invoke( |
| "put", String.class, key, |
| Object.class, value); |
| } |
| } |
| // execute the script |
| return engine.invoke("eval", String.class, getScript()); |
| } catch (BuildException be) { |
| //catch and rethrow build exceptions |
| throw be; |
| } catch (Exception be) { |
| //any other exception? Get its cause |
| Throwable t = be; |
| Throwable te = (Throwable) ReflectUtil.invoke(be, "getCause"); |
| if (te != null) { |
| if (te instanceof BuildException) { |
| throw (BuildException) te; |
| } else { |
| t = te; |
| } |
| } |
| throw new BuildException(t); |
| } finally { |
| restoreContextLoader(origLoader); |
| } |
| } |
| |
| private ReflectWrapper createEngine() throws Exception { |
| if (engine != null) { |
| return engine; |
| } |
| ReflectWrapper manager = new ReflectWrapper( |
| getClass().getClassLoader(), "javax.script.ScriptEngineManager"); |
| Object e = manager.invoke( |
| "getEngineByName", String.class, getLanguage()); |
| if (e == null) { |
| return null; |
| } |
| ReflectWrapper ret = new ReflectWrapper(e); |
| if (getKeepEngine()) { |
| this.engine = ret; |
| } |
| return ret; |
| } |
| } |