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1
7 package com.tirsen.nanning.definition;
8
9 import java.io.ByteArrayOutputStream  ;
10 import java.net.URL ;
11 import java.util.Collection ;
12 import java.util.HashMap ;
13 import java.util.Iterator ;
14 import java.util.Map ;
15
16 import com.tirsen.nanning.AspectFactory;
17 import com.tirsen.nanning.AspectInstance;
18 import com.tirsen.nanning.AspectException;
19 import com.tirsen.nanning.jelly.AspectTagLibrary;
20 import org.apache.commons.jelly.JellyContext;
21 import org.apache.commons.jelly.XMLOutput;
22
23
33 public class AspectRepository implements AspectFactory {
34 private static AspectRepository instance;
35
36 protected final Map interceptorDefinitions = new HashMap ();
37 protected final Map aspectDefinitions = new HashMap ();
38 protected final Map aspectClasses = new HashMap ();
39
40 public void reinitialize(AspectInstance aspectInstance) {
41 }
42
43 public void defineInterceptor(InterceptorDefinition interceptorDefinition) {
44 interceptorDefinitions.put(interceptorDefinition.getInterceptorClass(), interceptorDefinition);
45 }
46
47 public InterceptorDefinition getInterceptor(Class interceptorClass) {
48 InterceptorDefinition interceptorDefinition =
49 (InterceptorDefinition) interceptorDefinitions.get(interceptorClass);
50 if (interceptorDefinition == null) {
51 throw new IllegalArgumentException ("no such interceptor defined: " + interceptorClass);
52 }
53 return interceptorDefinition;
54 }
55
56 public void defineAspect(AspectDefinition aspectDefinition) {
57 aspectDefinitions.put(aspectDefinition.getInterfaceClass(), aspectDefinition);
58 }
59
60 public AspectDefinition getAspect(Class interfaceClass) {
61 return (AspectDefinition) aspectDefinitions.get(interfaceClass);
62 }
63
64 public void defineClass(AspectClass aspectClass) {
65 aspectClass.setAspectRepository(this);
66 aspectClasses.put(aspectClass.getInterfaceClass(), aspectClass);
67 }
68
69 public AspectClass getClass(Class interfaceClass) {
70 AspectClass aspectClass = (AspectClass) aspectClasses.get(interfaceClass);
71 if (aspectClass == null) {
72 throw new IllegalArgumentException ("Did not find aspect-class with interface " +
73 interfaceClass.getName());
74 }
75 return aspectClass;
76 }
77
78 public static AspectFactory getInstance() {
79 if (instance == null) {
80 instance = new AspectRepository();
81 try {
82 instance.configure(AspectRepository.class.getResource("/aspect-repository.xml"));
83 } catch (Exception e) {
84 throw new AspectException("failed to configure default instance");
85 }
86 }
87 return instance;
88 }
89
90
96 public void configure(URL resource) throws ConfigureException {
97 JellyContext context = new JellyContext();
98 try {
99 context.registerTagLibrary(AspectTagLibrary.TAG_LIBRARY_URI, new AspectTagLibrary());
100 context.registerTagLibrary("", new AspectTagLibrary());
101 XMLOutput xmlOutput = XMLOutput.createXMLOutput(new ByteArrayOutputStream ());
102 context.runScript(resource, xmlOutput);
103 } catch (Exception e) {
104 throw new ConfigureException(e);
105 }
106
107 Collection aspectRepositories = AspectTagLibrary.findDefinedRepositories(context);
108 Iterator iterator = aspectRepositories.iterator();
109 if (!iterator.hasNext()) {
110 throw new ConfigureException("No aspect-repository defined.");
111 }
112 while (iterator.hasNext()) {
113 AspectRepository configuredRepository = (AspectRepository) iterator.next();
114 this.interceptorDefinitions.putAll(configuredRepository.interceptorDefinitions);
115 this.aspectClasses.putAll(configuredRepository.aspectClasses);
116 this.aspectDefinitions.putAll(configuredRepository.aspectDefinitions);
117 }
118 }
119
120 public Collection getClasses() {
121 return aspectClasses.values();
122 }
123
124 public Object newInstance(Class aspectInterface) {
125 return newInstance(aspectInterface, null);
126 }
127
128 public Object newInstance(Class aspectInterface, Object [] targets) {
129 assert aspectInterface instanceof Class : "aspect-classes are identified by the interface-class of their first mixin";
130 Object instance = getClass(aspectInterface).newInstance(targets);
131 return instance;
132 }
133
134 }
135 |
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