| /* |
| * 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 |
| * |
| * https://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; |
| |
| import org.apache.tools.ant.BuildException; |
| import org.apache.tools.ant.MagicNames; |
| import org.apache.tools.ant.Project; |
| |
| /** |
| * This is a helper class used by ScriptRunnerHelper to |
| * create a ScriptRunner based on a classloader and on a language. |
| */ |
| public class ScriptRunnerCreator { |
| private static final String AUTO = "auto"; |
| private static final String UTIL_OPT = MagicNames.ANT_CORE_PACKAGE + ".util.optional"; |
| |
| private static final String BSF = "bsf"; |
| private static final String BSF_PACK = "org.apache.bsf"; |
| private static final String BSF_MANAGER = BSF_PACK + ".BSFManager"; |
| private static final String BSF_RUNNER = UTIL_OPT + ".ScriptRunner"; |
| |
| private static final String JAVAX = "javax"; |
| private static final String JAVAX_MANAGER = "javax.script.ScriptEngineManager"; |
| private static final String JAVAX_RUNNER = UTIL_OPT + ".JavaxScriptRunner"; |
| |
| private Project project; |
| private String manager; |
| private String language; |
| private ClassLoader scriptLoader = null; |
| |
| /** |
| * Constructor for creator. |
| * @param project the current project. |
| */ |
| public ScriptRunnerCreator(Project project) { |
| this.project = project; |
| } |
| |
| /** |
| * Create a ScriptRunner. |
| * @param manager the script manager ("auto" | "bsf" | "javax") |
| * @param language the language. |
| * @param classLoader the classloader to use |
| * @return the created script runner. |
| * @throws BuildException if unable to create the ScriptRunner. |
| */ |
| public synchronized ScriptRunnerBase createRunner( |
| String manager, String language, ClassLoader classLoader) { |
| this.manager = manager; |
| this.language = language; |
| this.scriptLoader = classLoader; |
| |
| if (language == null) { |
| throw new BuildException("script language must be specified"); |
| } |
| if (!manager.equals(AUTO) && !manager.equals(JAVAX) && !manager.equals(BSF)) { |
| throw new BuildException("Unsupported language prefix " + manager); |
| } |
| |
| // Check for bsf first then javax |
| // This version does not check if the scriptManager |
| // supports the language. |
| |
| ScriptRunnerBase ret = null; |
| ret = createRunner(BSF, BSF_MANAGER, BSF_RUNNER); |
| if (ret == null) { |
| ret = createRunner(JAVAX, JAVAX_MANAGER, JAVAX_RUNNER); |
| } |
| if (ret != null) { |
| return ret; |
| } |
| if (JAVAX.equals(manager)) { |
| throw new BuildException( |
| "Unable to load the script engine manager " + "(" + JAVAX_MANAGER + ")"); |
| } |
| if (BSF.equals(manager)) { |
| throw new BuildException( |
| "Unable to load the BSF script engine manager " + "(" + BSF_MANAGER + ")"); |
| } |
| throw new BuildException("Unable to load a script engine manager " |
| + "(" + BSF_MANAGER + " or " + JAVAX_MANAGER + ")"); |
| } |
| |
| /** |
| * Create a script runner if the scriptManager matches the passed |
| * in manager. |
| * This checks if the script manager exists in the scriptLoader |
| * classloader and if so it creates and returns the script runner. |
| * @param checkManager check if the manager matches this value. |
| * @param managerClass the name of the script manager class. |
| * @param runnerClass the name of ant's script runner for this manager. |
| * @return the script runner class. |
| * @throws BuildException if there is a problem creating the runner class. |
| */ |
| private ScriptRunnerBase createRunner( |
| String checkManager, String managerClass, String runnerClass) { |
| ScriptRunnerBase runner = null; |
| if (!manager.equals(AUTO) && !manager.equals(checkManager)) { |
| return null; |
| } |
| if (managerClass.equals(BSF_MANAGER)) { |
| if (scriptLoader.getResource(LoaderUtils.classNameToResource(managerClass)) == null) { |
| return null; |
| } |
| new ScriptFixBSFPath().fixClassLoader(scriptLoader, language); |
| } else { |
| try { |
| Class.forName(managerClass, true, scriptLoader); |
| } catch (Exception ex) { |
| return null; |
| } |
| } |
| try { |
| runner = (ScriptRunnerBase) Class.forName( |
| runnerClass, true, scriptLoader).getDeclaredConstructor().newInstance(); |
| runner.setProject(project); |
| } catch (Exception ex) { |
| throw ReflectUtil.toBuildException(ex); |
| } |
| runner.setLanguage(language); |
| runner.setScriptClassLoader(scriptLoader); |
| return runner; |
| } |
| } |