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  */
  24 
  25 package java.net.http;
  26 
  27 import java.util.Collections;
  28 import java.util.List;
  29 import java.util.Map;
  30 import java.util.Optional;
  31 import java.util.TreeMap;
  32 import java.util.function.Predicate;
  33 
  34 /**
  35  * Immutable HttpHeaders constructed from mutable HttpHeadersImpl.
  36  */
  37 
  38 class ImmutableHeaders implements HttpHeaders {
  39 
  40     private final Map<String,List<String>> map;
  41 
  42     @SuppressWarnings("unchecked")
  43     ImmutableHeaders() {
  44         map = (Map<String,List<String>>)Collections.EMPTY_MAP;
  45     }
  46     // TODO: fix lower case issue. Must be lc for http/2 compares ignoreCase for http/1
  47     ImmutableHeaders(HttpHeadersImpl h, Predicate<String> keyAllowed) {
  48         Map<String,List<String>> src = h.directMap();
  49         Map<String,List<String>> m = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
  50 
  51         src.forEach((key, value) -> {
  52             if (keyAllowed.test(key))
  53                 m.put(key, Collections.unmodifiableList(value));
  54         });
  55         map = Collections.unmodifiableMap(m);
  56     }
  57 
  58     @Override
  59     public Optional<String> firstValue(String name) {
  60         List<String> l = map.get(name);
  61         String v = l == null ? null : l.get(0);
  62         return Optional.ofNullable(v);
  63     }
  64 
  65     @Override
  66     public Optional<Long> firstValueAsLong(String name) {
  67         return firstValue(name).map((v -> Long.parseLong(v)));
  68     }
  69 
  70     @Override
  71     public List<String> allValues(String name) {
  72         return map.get(name);
  73     }
  74 
  75     @Override
  76     public Map<String, List<String>> map() {
  77         return map;
  78     }
  79 }