01: /**
02: *
03: * Copyright 2004 James Strachan
04: *
05: * Licensed under the Apache License, Version 2.0 (the "License");
06: * you may not use this file except in compliance with the License.
07: * You may obtain a copy of the License at
08: *
09: * 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: **/package org.codehaus.groovy.control;
18:
19: import org.codehaus.groovy.antlr.AntlrParserPluginFactory;
20:
21: /**
22: * A factory of parser plugin instances
23: *
24: * @version $Revision: 2120 $
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: } catch (ClassNotFoundException e) {
34: try {
35: type = ParserPluginFactory.class.getClassLoader()
36: .loadClass(name);
37: } catch (ClassNotFoundException e1) {
38: ClassLoader contextClassLoader = Thread
39: .currentThread().getContextClassLoader();
40: if (contextClassLoader != null) {
41: try {
42: type = contextClassLoader.loadClass(name);
43: } catch (ClassNotFoundException e2) {
44: // ignore
45: }
46: }
47: }
48: }
49:
50: if (type != null) {
51: try {
52: return (ParserPluginFactory) type.newInstance();
53: } catch (Exception e) {
54: throw new RuntimeException(
55: "Could not create AntlrParserPluginFactory: "
56: + e, e);
57: }
58: }
59: // can't find Antlr parser, so lets use the Classic one
60: }
61: return new AntlrParserPluginFactory();
62: }
63:
64: public abstract ParserPlugin createParserPlugin();
65: }
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