Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
DroolsProviderImplementation |
|
| 7.0;7 |
1 | /* | |
2 | Drools4 Integration Helper | |
3 | Copyright (C) 2009 Mathieu Boretti mathieu.boretti@gmail.com | |
4 | ||
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation, either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | ||
18 | */ | |
19 | package org.boretti.drools.integration.drools4.implementation; | |
20 | ||
21 | import java.lang.annotation.Annotation; | |
22 | import java.lang.reflect.Proxy; | |
23 | ||
24 | import org.apache.log4j.Logger; | |
25 | import org.boretti.drools.integration.drools4.DroolsInterface; | |
26 | import org.boretti.drools.integration.drools4.DroolsServiceType; | |
27 | import org.boretti.drools.integration.drools4.annotations.DroolsService; | |
28 | import org.boretti.drools.integration.drools4.exceptions.NotAnInterfaceDroolsError; | |
29 | import org.boretti.drools.integration.drools4.exceptions.NotAnnotatedInterfaceDroolsError; | |
30 | import org.boretti.drools.integration.drools4.implementation.DroolsInterfaceImplementation; | |
31 | import org.boretti.drools.integration.drools4.implementation.DroolsCompiledInterfaceImplementation; | |
32 | ||
33 | public class DroolsProviderImplementation { | |
34 | ||
35 | 1 | private final Logger logger = Logger.getLogger(this.getClass()); |
36 | ||
37 | 2 | private DroolsProviderImplementation() {} |
38 | ||
39 | 1 | private static final DroolsProviderImplementation instance = new DroolsProviderImplementation(); |
40 | ||
41 | public static final DroolsProviderImplementation getInstance() { | |
42 | 27 | return instance; |
43 | } | |
44 | ||
45 | @SuppressWarnings("unchecked") | |
46 | public <T> T getService(Class<T> clazz) { | |
47 | 27 | if (logger.isDebugEnabled()) logger.debug("Gettting service for "+clazz); |
48 | 27 | if (clazz==null) { |
49 | 1 | String msg = "Received class is null"; |
50 | 1 | logger.error(msg); |
51 | 1 | throw new IllegalArgumentException(msg); |
52 | } | |
53 | 26 | if (!clazz.isInterface()) { |
54 | 1 | String msg = "Not an interface "+clazz; |
55 | 1 | logger.error(msg); |
56 | 1 | throw new NotAnInterfaceDroolsError(msg); |
57 | } | |
58 | 25 | Annotation as[] = clazz.getAnnotations(); |
59 | 25 | boolean valid=false; |
60 | 25 | DroolsServiceType dst = null; |
61 | 25 | String resource = null; |
62 | 26 | for(Annotation a:as) { |
63 | 24 | if (a.annotationType().equals(DroolsService.class)) { |
64 | 23 | valid=true; |
65 | 23 | DroolsService ds = (DroolsService)a; |
66 | 23 | dst=ds.type(); |
67 | 23 | resource = ds.resourceName(); |
68 | 23 | break; |
69 | } | |
70 | } | |
71 | 25 | if(!valid) { |
72 | 2 | String msg = "Invalid interface (missing annotation) "+clazz; |
73 | 2 | logger.error(msg); |
74 | 2 | throw new NotAnnotatedInterfaceDroolsError(msg); |
75 | } | |
76 | 23 | DroolsInterfaceImplementation<T> inter=null; |
77 | 23 | if (dst==null) { |
78 | 0 | String msg = "Type must not be null"; |
79 | 0 | logger.error(msg); |
80 | 0 | throw new IllegalArgumentException(msg); |
81 | } | |
82 | 23 | if (DroolsServiceType.COMPILED.equals(dst)) { |
83 | 2 | if (resource==null || resource.trim().equalsIgnoreCase("")) resource = clazz.getName()+".cdrl"; |
84 | 2 | inter = new DroolsCompiledInterfaceImplementation<T>(clazz, resource); |
85 | 21 | } else if (DroolsServiceType.SOURCE.equals(dst)) { |
86 | 21 | if (resource==null || resource.trim().equalsIgnoreCase("")) resource = clazz.getName()+".drl"; |
87 | 21 | inter = new DroolsSourceInterfaceImplementation<T>(clazz,resource); |
88 | } | |
89 | 19 | if (logger.isDebugEnabled()) logger.debug("Creating proxy using "+clazz+" from "+dst+" using resource "+resource); |
90 | 19 | return (T) Proxy.newProxyInstance(clazz.getClassLoader(),new Class[] {clazz,DroolsInterface.class},new DroolsProxy<T>(clazz,inter)); |
91 | } | |
92 | } |