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 jdk.incubator.http; 27 28 import java.util.ArrayList; 29 import java.util.List; 30 import java.util.Map; 31 import java.util.Optional; 32 import java.util.OptionalLong; 33 import java.util.TreeMap; 34 import java.util.function.Predicate; 35 import static java.util.Collections.emptyList; 36 import static java.util.Collections.emptyMap; 37 import static java.util.Collections.unmodifiableList; 38 import static java.util.Collections.unmodifiableMap; 39 import static java.util.Objects.requireNonNull; 40 41 final class ImmutableHeaders implements HttpHeaders { 42 43 private final Map<String, List<String>> map; 44 45 public static ImmutableHeaders empty() { 46 return of(emptyMap()); 47 } 48 49 public static ImmutableHeaders of(Map<String, List<String>> src) { 50 return of(src, x -> true); 51 } 52 53 public static ImmutableHeaders of(Map<String, List<String>> src, 54 Predicate<? super String> keyAllowed) { 55 requireNonNull(src, "src"); 56 requireNonNull(keyAllowed, "keyAllowed"); 57 return new ImmutableHeaders(src, keyAllowed); 58 } 59 60 private ImmutableHeaders(Map<String, List<String>> src, 61 Predicate<? super String> keyAllowed) { 62 Map<String, List<String>> m = new TreeMap<>(String.CASE_INSENSITIVE_ORDER); 63 src.entrySet().stream() 64 .filter(e -> keyAllowed.test(e.getKey())) 65 .forEach(e -> 66 { 67 List<String> values = new ArrayList<>(e.getValue()); 68 m.put(e.getKey(), unmodifiableList(values)); 69 } 70 ); 71 this.map = unmodifiableMap(m); 72 } 73 74 @Override 75 public Optional<String> firstValue(String name) { 76 return allValues(name).stream().findFirst(); 77 } 78 79 @Override 80 public OptionalLong firstValueAsLong(String name) { 81 return allValues(name).stream().mapToLong(Long::valueOf).findFirst(); 82 } 83 84 @Override 85 public List<String> allValues(String name) { 86 requireNonNull(name); 87 List<String> values = map.get(name); 88 // Making unmodifiable list out of empty in order to make a list which 89 // throws UOE unconditionally 90 return values != null ? values : unmodifiableList(emptyList()); 91 } 92 93 @Override 94 public Map<String, List<String>> map() { 95 return map; 96 } 97 }