| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.nashorn.api.scripting; |
| |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.List; |
| import javax.script.ScriptEngine; |
| import javax.script.ScriptEngineFactory; |
| import jdk.nashorn.internal.runtime.Context; |
| import jdk.nashorn.internal.runtime.Version; |
| |
| /** |
| * JSR-223 compliant script engine factory for Nashorn. The engine answers for: |
| * <ul> |
| * <li>names {@code "nashorn"}, {@code "Nashorn"}, {@code "js"}, {@code "JS"}, {@code "JavaScript"}, |
| * {@code "javascript"}, {@code "ECMAScript"}, and {@code "ecmascript"};</li> |
| * <li>MIME types {@code "application/javascript"}, {@code "application/ecmascript"}, {@code "text/javascript"}, and |
| * {@code "text/ecmascript"};</li> |
| * <li>as well as for the extension {@code "js"}.</li> |
| * </ul> |
| * Programs executing in engines created using {@link #getScriptEngine(String[])} will have the passed arguments |
| * accessible as a global variable named {@code "arguments"}. |
| */ |
| public final class NashornScriptEngineFactory implements ScriptEngineFactory { |
| @Override |
| public String getEngineName() { |
| return (String) getParameter(ScriptEngine.ENGINE); |
| } |
| |
| @Override |
| public String getEngineVersion() { |
| return (String) getParameter(ScriptEngine.ENGINE_VERSION); |
| } |
| |
| @Override |
| public List<String> getExtensions() { |
| return Collections.unmodifiableList(extensions); |
| } |
| |
| @Override |
| public String getLanguageName() { |
| return (String) getParameter(ScriptEngine.LANGUAGE); |
| } |
| |
| @Override |
| public String getLanguageVersion() { |
| return (String) getParameter(ScriptEngine.LANGUAGE_VERSION); |
| } |
| |
| @Override |
| public String getMethodCallSyntax(final String obj, final String method, final String... args) { |
| final StringBuilder sb = new StringBuilder().append(obj).append('.').append(method).append('('); |
| final int len = args.length; |
| |
| if (len > 0) { |
| sb.append(args[0]); |
| } |
| for (int i = 1; i < len; i++) { |
| sb.append(',').append(args[i]); |
| } |
| sb.append(')'); |
| |
| return sb.toString(); |
| } |
| |
| @Override |
| public List<String> getMimeTypes() { |
| return Collections.unmodifiableList(mimeTypes); |
| } |
| |
| @Override |
| public List<String> getNames() { |
| return Collections.unmodifiableList(names); |
| } |
| |
| @Override |
| public String getOutputStatement(final String toDisplay) { |
| return "print(" + toDisplay + ")"; |
| } |
| |
| @Override |
| public Object getParameter(final String key) { |
| switch (key) { |
| case ScriptEngine.NAME: |
| return "javascript"; |
| case ScriptEngine.ENGINE: |
| return "Oracle Nashorn"; |
| case ScriptEngine.ENGINE_VERSION: |
| return Version.version(); |
| case ScriptEngine.LANGUAGE: |
| return "ECMAScript"; |
| case ScriptEngine.LANGUAGE_VERSION: |
| return "ECMA - 262 Edition 5.1"; |
| case "THREADING": |
| // The engine implementation is not thread-safe. Can't be |
| // used to execute scripts concurrently on multiple threads. |
| return null; |
| default: |
| throw new IllegalArgumentException("Invalid key"); |
| } |
| } |
| |
| @Override |
| public String getProgram(final String... statements) { |
| final StringBuilder sb = new StringBuilder(); |
| |
| for (final String statement : statements) { |
| sb.append(statement).append(';'); |
| } |
| |
| return sb.toString(); |
| } |
| |
| @Override |
| public ScriptEngine getScriptEngine() { |
| try { |
| return new NashornScriptEngine(this, getAppClassLoader()); |
| } catch (final RuntimeException e) { |
| if (Context.DEBUG) { |
| e.printStackTrace(); |
| } |
| throw e; |
| } |
| } |
| |
| /** |
| * Create a new Script engine initialized by given class loader. |
| * |
| * @param appLoader class loader to be used as script "app" class loader. |
| * @return newly created script engine. |
| */ |
| public ScriptEngine getScriptEngine(final ClassLoader appLoader) { |
| checkConfigPermission(); |
| return new NashornScriptEngine(this, appLoader); |
| } |
| |
| /** |
| * Create a new Script engine initialized by given arguments. |
| * |
| * @param args arguments array passed to script engine. |
| * @return newly created script engine. |
| */ |
| public ScriptEngine getScriptEngine(final String... args) { |
| checkConfigPermission(); |
| return new NashornScriptEngine(this, args, getAppClassLoader()); |
| } |
| |
| /** |
| * Create a new Script engine initialized by given arguments. |
| * |
| * @param args arguments array passed to script engine. |
| * @param appLoader class loader to be used as script "app" class loader. |
| * @return newly created script engine. |
| */ |
| public ScriptEngine getScriptEngine(final String[] args, final ClassLoader appLoader) { |
| checkConfigPermission(); |
| return new NashornScriptEngine(this, args, appLoader); |
| } |
| |
| // -- Internals only below this point |
| |
| private static void checkConfigPermission() { |
| final SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| sm.checkPermission(new RuntimePermission(Context.NASHORN_SET_CONFIG)); |
| } |
| } |
| |
| private static final List<String> names; |
| private static final List<String> mimeTypes; |
| private static final List<String> extensions; |
| |
| static { |
| names = immutableList( |
| "nashorn", "Nashorn", |
| "js", "JS", |
| "JavaScript", "javascript", |
| "ECMAScript", "ecmascript" |
| ); |
| |
| mimeTypes = immutableList( |
| "application/javascript", |
| "application/ecmascript", |
| "text/javascript", |
| "text/ecmascript" |
| ); |
| |
| extensions = immutableList("js"); |
| } |
| |
| private static List<String> immutableList(final String... elements) { |
| return Collections.unmodifiableList(Arrays.asList(elements)); |
| } |
| |
| private static ClassLoader getAppClassLoader() { |
| // Revisit: script engine implementation needs the capability to |
| // find the class loader of the context in which the script engine |
| // is running so that classes will be found and loaded properly |
| final ClassLoader ccl = Thread.currentThread().getContextClassLoader(); |
| return (ccl == null)? NashornScriptEngineFactory.class.getClassLoader() : ccl; |
| } |
| } |