1 /*
2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
23  * questions.
24  */
25 
26 package jdk.internal.net.http.common;
27 
28 import java.net.http.HttpHeaders;
29 import java.util.ArrayList;
30 import java.util.List;
31 import java.util.Map;
32 import java.util.TreeMap;
33 import static jdk.internal.net.http.common.Utils.ACCEPT_ALL;
34 
35 /** A mutable builder for collecting and building HTTP headers. */
36 public class HttpHeadersBuilder {
37 
38     private final TreeMap<String, List<String>> headersMap;
39 
HttpHeadersBuilder()40     public HttpHeadersBuilder() {
41         headersMap = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
42     }
43 
structuralCopy()44     public HttpHeadersBuilder structuralCopy() {
45         HttpHeadersBuilder builder = new HttpHeadersBuilder();
46         for (Map.Entry<String, List<String>> entry : headersMap.entrySet()) {
47             List<String> valuesCopy = new ArrayList<>(entry.getValue());
48             builder.headersMap.put(entry.getKey(), valuesCopy);
49         }
50         return builder;
51     }
52 
addHeader(String name, String value)53     public void addHeader(String name, String value) {
54         headersMap.computeIfAbsent(name, k -> new ArrayList<>(1))
55                   .add(value);
56     }
57 
setHeader(String name, String value)58     public void setHeader(String name, String value) {
59         // headers typically have one value
60         List<String> values = new ArrayList<>(1);
61         values.add(value);
62         headersMap.put(name, values);
63     }
64 
clear()65     public void clear() {
66         headersMap.clear();
67     }
68 
map()69     public Map<String, List<String>> map() {
70         return headersMap;
71     }
72 
build()73     public HttpHeaders build() {
74         return HttpHeaders.of(headersMap, ACCEPT_ALL);
75     }
76 
77     @Override
toString()78     public String toString() {
79         StringBuilder sb = new StringBuilder();
80         sb.append(super.toString()).append(" { ");
81         sb.append(map());
82         sb.append(" }");
83         return sb.toString();
84     }
85 }
86