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1
19
20 package edu.umd.cs.findbugs.classfile;
21
22 import java.lang.reflect.Constructor  ;
23 import java.lang.reflect.InvocationTargetException ;
24 import java.lang.reflect.Method ;
25 import java.lang.reflect.Modifier ;
26
27
28
39 public class ReflectionDatabaseFactory<E> implements IDatabaseFactory<E> {
40 private Class <E> databaseClass;
41
42 public ReflectionDatabaseFactory(Class <E> databaseClass) {
43 this.databaseClass = databaseClass;
44 }
45
46
49 public E createDatabase() throws CheckedAnalysisException {
50 E database;
51
52 database = createUsingStaticCreateMethod();
53 if (database != null) {
54 return database;
55 }
56
57 database = createUsingConstructor();
58 if (database != null) {
59 return database;
60 }
61
62 throw new CheckedAnalysisException(
63 "Could not find a way to create database " + databaseClass.getName());
64 }
65
66
72 private E createUsingStaticCreateMethod() throws CheckedAnalysisException {
73 Method createMethod;
74 try {
75 createMethod = databaseClass.getMethod("create", new Class [0]);
76 } catch (NoSuchMethodException e) {
77 return null;
78 }
79
80 if (!Modifier.isStatic(createMethod.getModifiers())) {
81 return null;
82 }
83
84 if (createMethod.getReturnType() != databaseClass) {
85 return null;
86 }
87
88 try {
89 return (E) createMethod.invoke(null, new Object [0]);
90 } catch (InvocationTargetException e) {
91 throw new CheckedAnalysisException("Could not create " + databaseClass.getName(), e);
92 } catch (IllegalAccessException e) {
93 throw new CheckedAnalysisException("Could not create " + databaseClass.getName(), e);
94 }
95 }
96
97
103 private E createUsingConstructor() throws CheckedAnalysisException {
104 Constructor <E> constructor;
105 try {
106 constructor = databaseClass.getConstructor(new Class [0]);
107 } catch (NoSuchMethodException e) {
108 return null;
109 }
110
111 try {
112 return constructor.newInstance(new Object [0]);
113 } catch (InstantiationException e) {
114 throw new CheckedAnalysisException("Could not create " + databaseClass.getName(), e);
115 } catch (IllegalAccessException e) {
116 throw new CheckedAnalysisException("Could not create " + databaseClass.getName(), e);
117 } catch (InvocationTargetException e) {
118 throw new CheckedAnalysisException("Could not create " + databaseClass.getName(), e);
119 }
120 }
121
122
125 public void registerWith(IAnalysisCache analysisCache) {
126 analysisCache.registerDatabaseFactory(databaseClass, this);
127 }
128
129 }
130 |
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