1 /***
2 *
3 * Copyright 2004 James Strachan
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 **/
18 package org.codehaus.groovy.control;
19
20
21 /***
22 * A factory of parser plugin instances
23 *
24 * @version $Revision: 1.7 $
25 */
26 public abstract class ParserPluginFactory {
27 public static ParserPluginFactory newInstance(boolean useNewParser) {
28 if (useNewParser) {
29 Class type = null;
30 String name = "org.codehaus.groovy.antlr.AntlrParserPluginFactory";
31 try {
32 type = Class.forName(name);
33 }
34 catch (ClassNotFoundException e) {
35 try {
36 type = ParserPluginFactory.class.getClassLoader().loadClass(name);
37 }
38 catch (ClassNotFoundException e1) {
39 ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
40 if (contextClassLoader != null) {
41 try {
42 type = contextClassLoader.loadClass(name);
43 }
44 catch (ClassNotFoundException e2) {
45
46 }
47 }
48 }
49 }
50
51 if (type != null) {
52 try {
53 return (ParserPluginFactory) type.newInstance();
54 }
55 catch (Exception e) {
56 throw new RuntimeException("Could not create AntlrParserPluginFactory: " + e, e);
57 }
58 }
59
60 }
61 return new ClassicParserPluginFactory();
62 }
63
64 public abstract ParserPlugin createParserPlugin();
65 }