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
|
/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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.android.voicemail.impl.mail.store.imap;
import com.android.voicemail.impl.VvmLog;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
/**
* Class represents an IMAP "element" that is not a list.
*
* <p>An atom, quoted string, literal, are all represented by this. Values like OK, STATUS are too.
* Also, this class class may contain more arbitrary value like "BODY[HEADER.FIELDS ("DATE")]". See
* {@link ImapResponseParser}.
*/
public abstract class ImapString extends ImapElement {
private static final byte[] EMPTY_BYTES = new byte[0];
public static final ImapString EMPTY =
new ImapString() {
@Override
public void destroy() {
// Don't call super.destroy().
// It's a shared object. We don't want the mDestroyed to be set on this.
}
@Override
public String getString() {
return "";
}
@Override
public InputStream getAsStream() {
return new ByteArrayInputStream(EMPTY_BYTES);
}
@Override
public String toString() {
return "";
}
};
// This is used only for parsing IMAP's FETCH ENVELOPE command, in which
// en_US-like date format is used like "01-Jan-2009 11:20:39 -0800", so this should be
// handled by Locale.US
private static final SimpleDateFormat DATE_TIME_FORMAT =
new SimpleDateFormat("dd-MMM-yyyy HH:mm:ss Z", Locale.US);
private boolean isInteger;
private int parsedInteger;
private Date parsedDate;
@Override
public final boolean isList() {
return false;
}
@Override
public final boolean isString() {
return true;
}
/**
* @return true if and only if the length of the string is larger than 0.
* <p>Note: IMAP NIL is considered an empty string. See {@link ImapResponseParser
* #parseBareString}. On the other hand, a quoted/literal string with value NIL (i.e. "NIL"
* and {3}\r\nNIL) is treated literally.
*/
public final boolean isEmpty() {
return getString().length() == 0;
}
public abstract String getString();
public abstract InputStream getAsStream();
/** @return whether it can be parsed as a number. */
public final boolean isNumber() {
if (isInteger) {
return true;
}
try {
parsedInteger = Integer.parseInt(getString());
isInteger = true;
return true;
} catch (NumberFormatException e) {
return false;
}
}
/** @return value parsed as a number, or 0 if the string is not a number. */
public final int getNumberOrZero() {
return getNumber(0);
}
/** @return value parsed as a number, or {@code defaultValue} if the string is not a number. */
public final int getNumber(int defaultValue) {
if (!isNumber()) {
return defaultValue;
}
return parsedInteger;
}
/** @return whether it can be parsed as a date using {@link #DATE_TIME_FORMAT}. */
public final boolean isDate() {
if (parsedDate != null) {
return true;
}
if (isEmpty()) {
return false;
}
try {
parsedDate = DATE_TIME_FORMAT.parse(getString());
return true;
} catch (ParseException e) {
VvmLog.w("ImapString", getString() + " can't be parsed as a date.");
return false;
}
}
/** @return value it can be parsed as a {@link Date}, or null otherwise. */
public final Date getDateOrNull() {
if (!isDate()) {
return null;
}
return parsedDate;
}
/** @return whether the value case-insensitively equals to {@code s}. */
public final boolean is(String s) {
if (s == null) {
return false;
}
return getString().equalsIgnoreCase(s);
}
/** @return whether the value case-insensitively starts with {@code s}. */
public final boolean startsWith(String prefix) {
if (prefix == null) {
return false;
}
final String me = this.getString();
if (me.length() < prefix.length()) {
return false;
}
return me.substring(0, prefix.length()).equalsIgnoreCase(prefix);
}
// To force subclasses to implement it.
@Override
public abstract String toString();
@Override
public final boolean equalsForTest(ImapElement that) {
if (!super.equalsForTest(that)) {
return false;
}
ImapString thatString = (ImapString) that;
return getString().equals(thatString.getString());
}
}
|