1 | |
|
2 | |
|
3 | |
|
4 | |
|
5 | |
|
6 | |
|
7 | |
|
8 | |
|
9 | |
|
10 | |
|
11 | |
|
12 | |
|
13 | |
|
14 | |
|
15 | |
|
16 | |
|
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.NotAnnotatedClassDroolsError; |
30 | |
import org.boretti.drools.integration.drools4.exceptions.NotAnnotatedInterfaceDroolsError; |
31 | |
import org.boretti.drools.integration.drools4.implementation.DroolsInterfaceImplementation; |
32 | |
import org.boretti.drools.integration.drools4.implementation.DroolsCompiledInterfaceImplementation; |
33 | |
import org.drools.RuleBase; |
34 | |
|
35 | |
public class DroolsProviderImplementation { |
36 | |
|
37 | 4 | private final Logger logger = Logger.getLogger(this.getClass()); |
38 | |
|
39 | 8 | private DroolsProviderImplementation() {} |
40 | |
|
41 | 4 | private static final DroolsProviderImplementation instance = new DroolsProviderImplementation(); |
42 | |
|
43 | |
public static final DroolsProviderImplementation getInstance() { |
44 | 140 | return instance; |
45 | |
} |
46 | |
|
47 | |
@SuppressWarnings("unchecked") |
48 | |
public <T> T getService(Class<T> clazz) { |
49 | 108 | if (logger.isDebugEnabled()) logger.debug("Gettting service for "+clazz); |
50 | 108 | validNullability(clazz,"Invalid interface - can't be null"); |
51 | 104 | if (!clazz.isInterface()) { |
52 | 4 | String msg = "Not an interface "+clazz; |
53 | 4 | logger.error(msg); |
54 | 4 | throw new NotAnInterfaceDroolsError(msg); |
55 | |
} |
56 | 100 | DroolsService ds = getAnnotation(clazz); |
57 | 100 | if(ds==null) { |
58 | 8 | String msg = "Invalid interface (missing annotation) "+clazz; |
59 | 8 | logger.error(msg); |
60 | 8 | throw new NotAnnotatedInterfaceDroolsError(msg); |
61 | |
} |
62 | 92 | DroolsServiceType dst=ds.type(); |
63 | 92 | String resource = ds.resourceName(); |
64 | 92 | validNullability(dst,"Invalid type parameter of annotation - can't be null"); |
65 | 92 | DroolsInterfaceImplementation<T> inter=getDroolsImplementation(dst,resource,clazz); |
66 | 76 | if (logger.isDebugEnabled()) logger.debug("Creating proxy using "+clazz+" from "+dst+" using resource "+resource); |
67 | 76 | return (T) Proxy.newProxyInstance(clazz.getClassLoader(),new Class[] {clazz,DroolsInterface.class},new DroolsProxy<T>(clazz,inter)); |
68 | |
} |
69 | |
|
70 | |
|
71 | |
|
72 | |
|
73 | |
|
74 | |
|
75 | |
|
76 | |
public <T> RuleBase getRuleBase(Class<T> clazz) { |
77 | 32 | if (logger.isDebugEnabled()) logger.debug("Gettting service for "+clazz); |
78 | 32 | validNullability(clazz,"Invalid class or interface - can't be null"); |
79 | 32 | DroolsService ds = getAnnotation(clazz); |
80 | 32 | if(ds==null) { |
81 | 12 | if (clazz.isInterface()) { |
82 | 8 | String msg = "Invalid interface (missing annotation) "+clazz; |
83 | 8 | logger.error(msg); |
84 | 8 | throw new NotAnnotatedInterfaceDroolsError(msg); |
85 | |
} else { |
86 | 4 | String msg = "Invalid class (missing annotation) "+clazz; |
87 | 4 | logger.error(msg); |
88 | 4 | throw new NotAnnotatedClassDroolsError(msg); |
89 | |
} |
90 | |
} |
91 | 20 | DroolsServiceType dst=ds.type(); |
92 | 20 | String resource = ds.resourceName(); |
93 | 20 | validNullability(dst,"Invalid type parameter of annotation - can't be null"); |
94 | 20 | return getDroolsImplementation(dst,resource,clazz).getRuleBase(); |
95 | |
} |
96 | |
|
97 | |
private <T> DroolsInterfaceImplementation<T> getDroolsImplementation(DroolsServiceType dst,String resource,Class<T> clazz) { |
98 | 112 | if (DroolsServiceType.COMPILED.equals(dst)) { |
99 | 16 | if (resource==null || resource.trim().equalsIgnoreCase("")) resource = clazz.getName()+".cdrl"; |
100 | 16 | return new DroolsCompiledInterfaceImplementation<T>(clazz, resource); |
101 | |
} else { |
102 | 96 | if (resource==null || resource.trim().equalsIgnoreCase("")) resource = clazz.getName()+".drl"; |
103 | 96 | return new DroolsSourceInterfaceImplementation<T>(clazz,resource); |
104 | |
} |
105 | |
} |
106 | |
|
107 | |
private void validNullability(Object o,String msg) { |
108 | 252 | if (o==null) { |
109 | 4 | logger.error(msg); |
110 | 4 | throw new IllegalArgumentException(msg); |
111 | |
} |
112 | 248 | } |
113 | |
|
114 | |
private <T> DroolsService getAnnotation(Class<T> clazz) { |
115 | 132 | Annotation as[] = clazz.getAnnotations(); |
116 | 140 | for(Annotation a:as) { |
117 | 120 | if (a.annotationType().equals(DroolsService.class)) return (DroolsService)a; |
118 | |
} |
119 | 20 | return null; |
120 | |
} |
121 | |
} |