diff options
Diffstat (limited to 'framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/optional/ScriptRunner.java')
| -rw-r--r-- | framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/optional/ScriptRunner.java | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/optional/ScriptRunner.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/optional/ScriptRunner.java new file mode 100644 index 00000000..0f4cd1f9 --- /dev/null +++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/optional/ScriptRunner.java @@ -0,0 +1,177 @@ +/* + * 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 java.util.Hashtable; +import java.util.Iterator; + +import org.apache.bsf.BSFEngine; +import org.apache.bsf.BSFException; +import org.apache.bsf.BSFManager; +import org.apache.tools.ant.BuildException; +import org.apache.tools.ant.Project; +import org.apache.tools.ant.util.ReflectUtil; +import org.apache.tools.ant.util.ScriptRunnerBase; + +/** + * This class is used to run BSF scripts + * + */ +public class ScriptRunner extends ScriptRunnerBase { + // Register Groovy ourselves, since BSF did not + // natively support it in versions previous to 1.2.4. + static { + BSFManager.registerScriptingEngine( + "groovy", + "org.codehaus.groovy.bsf.GroovyEngine", + new String[] {"groovy", "gy"}); + } + + private BSFEngine engine; + private BSFManager manager; + + /** + * Get the name of the manager prefix. + * @return "bsf" + */ + public String getManagerName() { + return "bsf"; + } + + /** + * Check if bsf supports the language. + * @return true if bsf can create an engine for this language. + */ + public boolean supportsLanguage() { + Hashtable table = (Hashtable) ReflectUtil.getField( + new BSFManager(), "registeredEngines"); + String engineClassName = (String) table.get(getLanguage()); + if (engineClassName == null) { + getProject().log( + "This is no BSF engine class for language '" + + getLanguage() + "'", + Project.MSG_VERBOSE); + return false; + } + try { + getScriptClassLoader().loadClass(engineClassName); + return true; + } catch (Throwable ex) { + getProject().log( + "unable to create BSF engine class for language '" + + getLanguage() + "'", + ex, + Project.MSG_VERBOSE); + return false; + } + } + + /** + * Do the work. + * + * @param execName the name that will be passed to BSF for this script execution. + * @exception BuildException if something goes wrong executing the script. + */ + public void executeScript(String execName) throws BuildException { + checkLanguage(); + ClassLoader origLoader = replaceContextLoader(); + try { + BSFManager m = createManager(); + declareBeans(m); + // execute the script + if (engine == null) { + m.exec(getLanguage(), execName, 0, 0, getScript()); + } else { + engine.exec(execName, 0, 0, getScript()); + } + } catch (BSFException be) { + throw getBuildException(be); + } finally { + restoreContextLoader(origLoader); + } + } + + /** + * Evaluate the script. + * + * @param execName the name that will be passed to BSF 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 { + BSFManager m = createManager(); + declareBeans(m); + // execute the script + if (engine == null) { + return m.eval(getLanguage(), execName, 0, 0, getScript()); + } + return engine.eval(execName, 0, 0, getScript()); + } catch (BSFException be) { + throw getBuildException(be); + } finally { + restoreContextLoader(origLoader); + } + } + + /** + * Get/create a BuildException from a BSFException. + * @param be BSFException to convert. + * @return BuildException the converted exception. + */ + private BuildException getBuildException(BSFException be) { + Throwable t = be; + Throwable te = be.getTargetException(); + if (te instanceof BuildException) { + return (BuildException) te; + } + return new BuildException(te == null ? t : te); + } + + private void declareBeans(BSFManager m) throws BSFException { + for (Iterator i = getBeans().keySet().iterator(); i.hasNext();) { + String key = (String) i.next(); + Object value = getBeans().get(key); + if (value != null) { + m.declareBean(key, value, value.getClass()); + } else { + // BSF uses a hashtable to store values + // so cannot declareBean with a null value + // So need to remove any bean of this name as + // that bean should not be visible + m.undeclareBean(key); + } + } + } + + private BSFManager createManager() throws BSFException { + if (manager != null) { + return manager; + } + BSFManager m = new BSFManager(); + m.setClassLoader(getScriptClassLoader()); + if (getKeepEngine()) { + BSFEngine e = manager.loadScriptingEngine(getLanguage()); + this.manager = m; + this.engine = e; + } + return m; + } +} |