1
|
/**
|
2
|
* Copyright (C) 2007 EDIT
|
3
|
* European Distributed Institute of Taxonomy
|
4
|
* http://www.e-taxonomy.eu
|
5
|
*
|
6
|
* The contents of this file are subject to the Mozilla Public License Version 1.1
|
7
|
* See LICENSE.TXT at the top of this package for the full license terms.
|
8
|
*/
|
9
|
|
10
|
package eu.etaxonomy.cdm.persistence.dao;
|
11
|
|
12
|
import java.lang.reflect.Method;
|
13
|
import java.util.ArrayList;
|
14
|
import java.util.Arrays;
|
15
|
import java.util.HashMap;
|
16
|
import java.util.List;
|
17
|
import java.util.Map;
|
18
|
|
19
|
import org.apache.log4j.Logger;
|
20
|
import org.springframework.stereotype.Component;
|
21
|
|
22
|
/**
|
23
|
* @author n.hoffmann
|
24
|
* @created Mar 11, 2010
|
25
|
* @version 1.0
|
26
|
*/
|
27
|
@Component
|
28
|
public class MethodCacheImpl implements IMethodCache {
|
29
|
|
30
|
// MethodUtils
|
31
|
|
32
|
private Map<MethodDescriptor, Method> methodMap = new HashMap<MethodDescriptor, Method>();
|
33
|
|
34
|
/*
|
35
|
* (non-Javadoc)
|
36
|
* @see eu.etaxonomy.cdm.persistence.dao.IMethodCache#getMethod(java.lang.Class, java.lang.String, java.lang.Class)
|
37
|
*/
|
38
|
public Method getMethod(Class clazz, String methodName, Class parameterType) {
|
39
|
MethodDescriptor methodDescriptor = new MethodDescriptor(clazz, methodName, new Class[]{parameterType});
|
40
|
|
41
|
if(methodMap.containsKey(methodDescriptor)){
|
42
|
return methodMap.get(methodDescriptor);
|
43
|
}
|
44
|
|
45
|
Method method = getMethodInternal(clazz, methodName, parameterType);
|
46
|
if(method != null){
|
47
|
method.setAccessible(true);
|
48
|
}
|
49
|
// we also put null methods into the map to benefit from caching
|
50
|
put(methodDescriptor, method);
|
51
|
|
52
|
return method;
|
53
|
}
|
54
|
|
55
|
/**
|
56
|
* Checks class hierarchy of the given class for a method that fits to the given name and parameter type
|
57
|
*
|
58
|
* @param clazz
|
59
|
* @param methodName
|
60
|
* @param parameterType
|
61
|
* @return
|
62
|
*/
|
63
|
private Method getMethodInternal(Class clazz, String methodName,
|
64
|
Class parameterType){
|
65
|
// stop recursing when there are no more superclasses
|
66
|
if(clazz == null){
|
67
|
return null;
|
68
|
}
|
69
|
|
70
|
Method method = null;
|
71
|
|
72
|
for(Class includedType : getIncludedTypes(parameterType, new ArrayList<Class>())){
|
73
|
try {
|
74
|
method = clazz.getDeclaredMethod(methodName, includedType);
|
75
|
}catch (NoSuchMethodException e) {
|
76
|
;
|
77
|
}
|
78
|
}
|
79
|
|
80
|
// if we have a method return it
|
81
|
if(method != null){
|
82
|
return method;
|
83
|
}
|
84
|
|
85
|
// recurse into superclass if no method was found
|
86
|
return getMethodInternal(clazz.getSuperclass(), methodName, parameterType);
|
87
|
}
|
88
|
|
89
|
/**
|
90
|
* Create a list containing the type and all supertypes of a given type
|
91
|
*
|
92
|
* @param clazz
|
93
|
* @param classList
|
94
|
* @return
|
95
|
*/
|
96
|
private List<Class> getIncludedTypes(Class clazz, List<Class> classList){
|
97
|
if(clazz == null){
|
98
|
return classList;
|
99
|
}
|
100
|
classList.add(clazz);
|
101
|
Class[] interfaces = clazz.getInterfaces();
|
102
|
if(interfaces != null){
|
103
|
classList.addAll(Arrays.asList(interfaces));
|
104
|
}
|
105
|
return getIncludedTypes(clazz.getSuperclass(), classList);
|
106
|
}
|
107
|
|
108
|
/**
|
109
|
* Fill the cache
|
110
|
*
|
111
|
* @param methodDescriptor
|
112
|
* @param method
|
113
|
*/
|
114
|
private void put(MethodDescriptor methodDescriptor, Method method) {
|
115
|
methodMap.put(methodDescriptor, method);
|
116
|
}
|
117
|
|
118
|
/**
|
119
|
*
|
120
|
* @author n.hoffmann
|
121
|
* @created Mar 11, 2010
|
122
|
* @version 1.0
|
123
|
*/
|
124
|
private static class MethodDescriptor{
|
125
|
private static final Logger logger = Logger
|
126
|
.getLogger(MethodDescriptor.class);
|
127
|
|
128
|
/** An empty class array */
|
129
|
private static final Class[] emptyClassArray = new Class[0];
|
130
|
|
131
|
private Class clazz;
|
132
|
private String methodName;
|
133
|
private Class[] parameterTypes;
|
134
|
private int hashCode;
|
135
|
|
136
|
/**
|
137
|
* The sole constructor.
|
138
|
*
|
139
|
* @param clazz the class to reflect, must not be null
|
140
|
* @param methodName the method name to obtain
|
141
|
* @param paramTypes the array of classes representing the paramater types
|
142
|
* @param exact whether the match has to be exact.
|
143
|
*/
|
144
|
public MethodDescriptor(Class clazz, String methodName, Class[] paramTypes) {
|
145
|
if (clazz == null) {
|
146
|
throw new IllegalArgumentException("Class cannot be null");
|
147
|
}
|
148
|
if (methodName == null) {
|
149
|
throw new IllegalArgumentException("Method Name cannot be null");
|
150
|
}
|
151
|
if (paramTypes == null) {
|
152
|
paramTypes = emptyClassArray;
|
153
|
}
|
154
|
|
155
|
this.clazz = clazz;
|
156
|
this.methodName = methodName;
|
157
|
this.parameterTypes = paramTypes;
|
158
|
|
159
|
this.hashCode = methodName.length();
|
160
|
}
|
161
|
/**
|
162
|
* Checks for equality.
|
163
|
* @param object object to be tested for equality
|
164
|
* @return true, if the object describes the same Method.
|
165
|
*/
|
166
|
public boolean equals(Object object) {
|
167
|
if (!(object instanceof MethodDescriptor)) {
|
168
|
return false;
|
169
|
}
|
170
|
MethodDescriptor methodDescriptor = (MethodDescriptor)object;
|
171
|
|
172
|
return (
|
173
|
methodName.equals(methodDescriptor.methodName) &&
|
174
|
clazz.equals(methodDescriptor.clazz) &&
|
175
|
java.util.Arrays.equals(parameterTypes, methodDescriptor.parameterTypes)
|
176
|
);
|
177
|
}
|
178
|
/**
|
179
|
* Returns the string length of method name. I.e. if the
|
180
|
* hashcodes are different, the objects are different. If the
|
181
|
* hashcodes are the same, need to use the equals method to
|
182
|
* determine equality.
|
183
|
* @return the string length of method name.
|
184
|
*/
|
185
|
public int hashCode() {
|
186
|
return hashCode;
|
187
|
}
|
188
|
}
|
189
|
}
|