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
|
/*
* Copyright (C) 2013 Square, Inc.
*
* 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.squareup.okhttp;
import java.nio.charset.Charset;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* An <a href="http://tools.ietf.org/html/rfc2045">RFC 2045</a> Media Type,
* appropriate to describe the content type of an HTTP request or response body.
*/
public final class MediaType {
private static final String TOKEN = "([a-zA-Z0-9-!#$%&'*+.^_`{|}~]+)";
private static final String QUOTED = "\"([^\"]*)\"";
private static final Pattern TYPE_SUBTYPE = Pattern.compile(TOKEN + "/" + TOKEN);
private static final Pattern PARAMETER = Pattern.compile(
";\\s*" + TOKEN + "=(?:" + TOKEN + "|" + QUOTED + ")");
private final String mediaType;
private final String type;
private final String subtype;
private final String charset;
private MediaType(String mediaType, String type, String subtype, String charset) {
this.mediaType = mediaType;
this.type = type;
this.subtype = subtype;
this.charset = charset;
}
/**
* Returns a media type for {@code string}, or null if {@code string} is not a
* well-formed media type.
*/
public static MediaType parse(String string) {
Matcher typeSubtype = TYPE_SUBTYPE.matcher(string);
if (!typeSubtype.lookingAt()) return null;
String type = typeSubtype.group(1).toLowerCase(Locale.US);
String subtype = typeSubtype.group(2).toLowerCase(Locale.US);
String charset = null;
Matcher parameter = PARAMETER.matcher(string);
for (int s = typeSubtype.end(); s < string.length(); s = parameter.end()) {
parameter.region(s, string.length());
if (!parameter.lookingAt()) return null; // This is not a well-formed media type.
String name = parameter.group(1);
if (name == null || !name.equalsIgnoreCase("charset")) continue;
if (charset != null) throw new IllegalArgumentException("Multiple charsets: " + string);
charset = parameter.group(2) != null
? parameter.group(2) // Value is a token.
: parameter.group(3); // Value is a quoted string.
}
return new MediaType(string, type, subtype, charset);
}
/**
* Returns the high-level media type, such as "text", "image", "audio",
* "video", or "application".
*/
public String type() {
return type;
}
/**
* Returns a specific media subtype, such as "plain" or "png", "mpeg",
* "mp4" or "xml".
*/
public String subtype() {
return subtype;
}
/**
* Returns the charset of this media type, or null if this media type doesn't
* specify a charset.
*/
public Charset charset() {
return charset != null ? Charset.forName(charset) : null;
}
/**
* Returns the charset of this media type, or {@code defaultValue} if this
* media type doesn't specify a charset.
*/
public Charset charset(Charset defaultValue) {
return charset != null ? Charset.forName(charset) : defaultValue;
}
/**
* Returns the encoded media type, like "text/plain; charset=utf-8",
* appropriate for use in a Content-Type header.
*/
@Override public String toString() {
return mediaType;
}
@Override public boolean equals(Object o) {
return o instanceof MediaType && ((MediaType) o).mediaType.equals(mediaType);
}
@Override public int hashCode() {
return mediaType.hashCode();
}
}
|
