1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
package org.gnunet.construct;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.math.BigInteger;
import java.util.List;
public class ReflectUtil {
public static <T> T justInstantiate(Class<T> c) {
try {
return c.getConstructor().newInstance();
} catch (InstantiationException e) {
throw new AssertionError("Cannot instantiate " + c);
} catch (IllegalAccessException e) {
throw new AssertionError(
String.format("Cannot instantiate Message %s (illegal access)", c));
} catch (NoSuchMethodException e) {
throw new AssertionError(
String.format("No suitable default constructor for class %s", c));
} catch (InvocationTargetException e) {
throw new AssertionError(
String.format("Exception thrown while constructing object of class %s", c));
}
}
/**
* assign an enum value to each numeric type we want to serialize in
* order do switch statements on field types
*/
public enum NumFieldType {
BIGNUM, BYTE_PRIM, SHORT_PRIM, INT_PRIM, LONG_PRIM, CHAR_PRIM
}
/**
* Convenience wrapper for a field that stores a numeric value.
*/
public static class NumField {
final private Field targetField;
final private NumFieldType targetType;
public NumFieldType getNumFieldType() {
return targetType;
}
public NumField(Field f) {
this.targetField = f;
if (f.getType().equals(Long.TYPE)) {
targetType = NumFieldType.LONG_PRIM;
} else if (f.getType().equals(java.lang.Integer.TYPE)) {
targetType = NumFieldType.INT_PRIM;
} else if (f.getType().equals(Short.TYPE)) {
targetType = NumFieldType.SHORT_PRIM;
} else if (f.getType().equals(Byte.TYPE)) {
targetType = NumFieldType.BYTE_PRIM;
} else if (f.getType().equals(Character.TYPE)) {
targetType = NumFieldType.CHAR_PRIM;
} else if (f.getType().equals(BigInteger.class)) {
targetType = NumFieldType.BIGNUM;
} else {
throw new AssertionError(
"expected numeric type, got: " + f.getType());
}
}
public void set(Object obj, long val) {
try {
switch (targetType) {
case LONG_PRIM:
targetField.setLong(obj, val);
break;
case INT_PRIM:
targetField.setInt(obj, (int) val);
break;
case SHORT_PRIM:
targetField.setShort(obj, (short) val);
break;
case BYTE_PRIM:
targetField.setByte(obj, (byte) val);
break;
case CHAR_PRIM:
targetField.setChar(obj, (char) val);
break;
case BIGNUM:
targetField.set(obj, BigInteger.valueOf(val));
break;
}
} catch (IllegalArgumentException e) {
throw new AssertionError("cannot access field");
} catch (IllegalAccessException e) {
throw new AssertionError("cannot access field");
}
}
public void set(Object obj, BigInteger val) {
try {
targetField.set(obj, val);
} catch (IllegalAccessException e) {
throw new AssertionError("cannot access field");
}
}
public long get(Object obj) {
try {
switch (targetType) {
case LONG_PRIM:
return targetField.getLong(obj);
case INT_PRIM:
return targetField.getInt(obj);
case SHORT_PRIM:
return targetField.getShort(obj);
case BYTE_PRIM:
return targetField.getByte(obj);
case CHAR_PRIM:
return targetField.getChar(obj);
case BIGNUM:
throw new RuntimeException("get() called on NumField that is a BigInteger");
default:
throw new AssertionError("unreachable");
}
} catch (IllegalAccessException e) {
throw new AssertionError("cannot access field");
}
}
public BigInteger getBig(Object obj) {
if (isBig()) {
return (BigInteger) justGet(obj, targetField);
} else {
return BigInteger.valueOf(this.get(obj));
}
}
public boolean isBig() {
return targetType.equals(NumFieldType.BIGNUM);
}
}
public static Object followFieldPath(List<Field> fl, Object obj,
int depth) {
for (int i = 0; i < depth; ++i) {
try {
obj = fl.get(i).get(obj);
} catch (IllegalArgumentException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new AssertionError("cannot access field " + fl.get(i)
+ " of " + obj.getClass());
}
}
return obj;
}
public static Object followFieldPath(List<Field> fl, Object obj) {
return followFieldPath(fl, obj, fl.size());
}
public static Object followFieldPathToParent(List<Field> fl, Object obj) {
return followFieldPath(fl, obj, fl.size() - 1);
}
public static Object justGet(Object obj, Field f) {
try {
return f.get(obj);
} catch (IllegalAccessException e) {
throw new AssertionError(
String.format("Cannot access private field '%s' in class %s", f, obj.getClass()));
} catch (IllegalArgumentException e) {
throw new AssertionError("Cannot access field '" + f.getName() + "' in class " + obj.getClass());
}
}
public static void justSet(Object obj, Field f, Object val) {
try {
f.set(obj, val);
} catch (IllegalAccessException e) {
throw new AssertionError(
String.format("Cannot access private field %s in class %s", f, obj.getClass()));
}
}
}
|
