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; 27 28 import java.util.ArrayList; 29 import java.util.List; 30 import java.util.Map; 31 import java.util.TreeMap; 32 import java.util.function.Predicate; 33 import static java.util.Collections.emptyMap; 34 import static java.util.Collections.unmodifiableList; 35 import static java.util.Collections.unmodifiableMap; 36 import static java.util.Objects.requireNonNull; 37 38 final class ImmutableHeaders extends HttpHeaders { 39 40 private final Map<String, List<String>> map; 41 42 public static ImmutableHeaders empty() { 43 return of(emptyMap()); 44 } 45 46 public static ImmutableHeaders of(Map<String, List<String>> src) { 47 return of(src, x -> true); 48 } 49 50 public static ImmutableHeaders of(Map<String, List<String>> src, 51 Predicate<? super String> keyAllowed) { 52 requireNonNull(src, "src"); 53 requireNonNull(keyAllowed, "keyAllowed"); 54 return new ImmutableHeaders(src, keyAllowed); 55 } 56 57 private ImmutableHeaders(Map<String, List<String>> src, 58 Predicate<? super String> keyAllowed) { 59 Map<String, List<String>> m = new TreeMap<>(String.CASE_INSENSITIVE_ORDER); 60 src.entrySet().stream() 61 .filter(e -> keyAllowed.test(e.getKey())) 62 .forEach(e -> 63 { 64 List<String> values = new ArrayList<>(e.getValue()); 65 m.put(e.getKey(), unmodifiableList(values)); 66 } 67 ); 68 this.map = unmodifiableMap(m); 69 } 70 71 @Override 72 public Map<String, List<String>> map() { 73 return map; 74 } 75 }