1 /*
   2  * Copyright (c) 2015, 2016, 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 java.net.http;
  27 
  28 import java.util.Collections;
  29 import java.util.List;
  30 import java.util.Map;
  31 import java.util.Optional;
  32 import java.util.TreeMap;
  33 import java.util.function.Predicate;
  34 
  35 /**
  36  * Immutable HttpHeaders constructed from mutable HttpHeadersImpl.
  37  */
  38 
  39 class ImmutableHeaders implements HttpHeaders {
  40 
  41     private final Map<String,List<String>> map;
  42 
  43     @SuppressWarnings("unchecked")
  44     ImmutableHeaders() {
  45         map = (Map<String,List<String>>)Collections.EMPTY_MAP;
  46     }
  47     // TODO: fix lower case issue. Must be lc for http/2 compares ignoreCase for http/1
  48     ImmutableHeaders(HttpHeadersImpl h, Predicate<String> keyAllowed) {
  49         Map<String,List<String>> src = h.directMap();
  50         Map<String,List<String>> m = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
  51 
  52         src.forEach((key, value) -> {
  53             if (keyAllowed.test(key))
  54                 m.put(key, Collections.unmodifiableList(value));
  55         });
  56         map = Collections.unmodifiableMap(m);
  57     }
  58 
  59     @Override
  60     public Optional<String> firstValue(String name) {
  61         List<String> l = map.get(name);
  62         String v = l == null ? null : l.get(0);
  63         return Optional.ofNullable(v);
  64     }
  65 
  66     @Override
  67     public Optional<Long> firstValueAsLong(String name) {
  68         return firstValue(name).map((v -> Long.parseLong(v)));
  69     }
  70 
  71     @Override
  72     public List<String> allValues(String name) {
  73         return map.get(name);
  74     }
  75 
  76     @Override
  77     public Map<String, List<String>> map() {
  78         return map;
  79     }
  80 }