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
|
/*
* Copyright 2006-2012 Amazon Technologies, Inc. or its affiliates.
* Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
* of Amazon Technologies, Inc. or its affiliates. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.amazon.carbonado.constraint;
import java.lang.annotation.*;
import java.util.Arrays;
import com.amazon.carbonado.MalformedTypeException;
/**
* Limits the value of a property to be a member of a specific set. The
* property value may be a String, CharSequence, char, Character, or character
* array. If the property value is outside the set, an IllegalArgumentException
* is thrown.
*
* <p>Example:<pre>
* public interface UserInfo extends Storable {
* char isActive();
* <b>@TextConstraint(allowed={"Y", "N"})</b>
* void setActive(char value);
*
* ...
* }
* </pre>
*
* @author Brian S O'Neill
* @see IntegerConstraint
* @see FloatConstraint
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@ConstraintDefinition
public @interface TextConstraint {
/**
* Specific allowed values for property. Default is unlimited.
*/
String[] allowed() default {};
/**
* Specific disallowed values for property. Default is none.
*/
String[] disallowed() default {};
/**
* Constraint implementation for {@link TextConstraint}.
*/
public static class Constraint {
private final String mPropertyName;
/** Allowed values, sorted for binary search. */
private final String[] mAllowed;
/** Disallowed values, sorted for binary search. */
private final String[] mDisallowed;
/**
* @param type type of object that contains the constrained property
* @param propertyName name of property with constraint
* @param ann specific annotation that binds to this constraint class
*/
public Constraint(Class<?> type, String propertyName, TextConstraint ann) {
this(type, propertyName, ann.allowed(), ann.disallowed());
}
/**
* @param type type of object that contains the constrained property
* @param propertyName name of property with constraint
* @param allowed optional set of allowed values
* @param disallowed optional set of disallowed values
*/
public Constraint(Class<?> type, String propertyName,
String[] allowed, String[] disallowed) {
mPropertyName = propertyName;
if (disallowed == null || disallowed.length == 0) {
disallowed = null;
} else {
disallowed = disallowed.clone();
Arrays.sort(disallowed);
}
if (allowed == null || allowed.length == 0) {
allowed = null;
} else {
allowed = allowed.clone();
Arrays.sort(allowed);
if (disallowed != null) {
for (String value : allowed) {
if (Arrays.binarySearch(disallowed, value) >= 0) {
throw new MalformedTypeException
(type, "Allowed value contradiction for text constraint " +
"on property \"" + propertyName + "\": " + value);
}
}
// No need to have a set of disallowed values.
disallowed = null;
}
}
mDisallowed = disallowed;
mAllowed = allowed;
}
public void constrain(CharSequence propertyValue) {
constrain(propertyValue.toString());
}
public void constrain(String propertyValue) {
if (propertyValue == null) {
return;
}
if (mDisallowed != null && Arrays.binarySearch(mDisallowed, propertyValue) >= 0) {
throw new IllegalArgumentException
("Value for \"" + mPropertyName + "\" is disallowed: " + propertyValue);
}
if (mAllowed != null && Arrays.binarySearch(mAllowed, propertyValue) < 0) {
throw new IllegalArgumentException
("Value for \"" + mPropertyName + "\" is not allowed: " + propertyValue);
}
}
public void constrain(char propertyValue) {
constrain(Character.toString(propertyValue));
}
public void constrain(char[] propertyValue) {
if (propertyValue != null) {
constrain(new String(propertyValue));
}
}
}
}
|
