KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > codehaus > groovy > control > ParserPluginFactory


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 import org.codehaus.groovy.antlr.AntlrParserPluginFactory;
21
22 /**
23  * A factory of parser plugin instances
24  *
25  * @version $Revision: 1.8 $
26  */
27 public abstract class ParserPluginFactory {
28     public static ParserPluginFactory newInstance(boolean useNewParser) {
29         if (useNewParser) {
30             Class JavaDoc type = null;
31             String JavaDoc name = "org.codehaus.groovy.antlr.AntlrParserPluginFactory";
32             try {
33                 type = Class.forName(name);
34             }
35             catch (ClassNotFoundException JavaDoc e) {
36                 try {
37                     type = ParserPluginFactory.class.getClassLoader().loadClass(name);
38                 }
39                 catch (ClassNotFoundException JavaDoc e1) {
40                     ClassLoader JavaDoc contextClassLoader = Thread.currentThread().getContextClassLoader();
41                     if (contextClassLoader != null) {
42                         try {
43                             type = contextClassLoader.loadClass(name);
44                         }
45                         catch (ClassNotFoundException JavaDoc e2) {
46                             // ignore
47 }
48                     }
49                 }
50             }
51
52             if (type != null) {
53                 try {
54                     return (ParserPluginFactory) type.newInstance();
55                 }
56                 catch (Exception JavaDoc e) {
57                     throw new RuntimeException JavaDoc("Could not create AntlrParserPluginFactory: " + e, e);
58                 }
59             }
60             // can't find Antlr parser, so lets use the Classic one
61 }
62         return new AntlrParserPluginFactory();
63     }
64
65     public abstract ParserPlugin createParserPlugin();
66 }
67
Popular Tags