1 /*
   2  * Copyright (c) 2015, 2017, 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.incubator.http.internal.common;
  27 
  28 import jdk.incubator.http.HttpHeaders;
  29 import java.util.ArrayList;
  30 import java.util.Collections;
  31 import java.util.List;
  32 import java.util.Map;
  33 import java.util.Set;
  34 import java.util.TreeMap;
  35 
  36 /**
  37  * Implementation of HttpHeaders.
  38  */
  39 public class HttpHeadersImpl extends HttpHeaders {
  40 
  41     private final TreeMap<String,List<String>> headers;
  42 
  43     public HttpHeadersImpl() {
  44         headers = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
  45     }
  46 
  47     @Override
  48     public Map<String, List<String>> map() {
  49         return Collections.unmodifiableMap(headers);
  50     }
  51 
  52     // package private mutators
  53 
  54     public HttpHeadersImpl deepCopy() {
  55         HttpHeadersImpl h1 = new HttpHeadersImpl();
  56         Set<String> keys = headers.keySet();
  57         for (String key : keys) {
  58             List<String> vals = headers.get(key);
  59             List<String> vals1 = new ArrayList<>(vals);
  60             h1.headers.put(key, vals1);
  61         }
  62         return h1;
  63     }
  64 
  65     public void addHeader(String name, String value) {
  66         headers.computeIfAbsent(name, k -> new ArrayList<>(1))
  67                .add(value);
  68     }
  69 
  70     public void setHeader(String name, String value) {
  71         List<String> values = new ArrayList<>(1); // most headers has one value
  72         values.add(value);
  73         headers.put(name, values);
  74     }
  75 }