Sat, 07 Nov 2020 10:30:02 +0800
Added tag mips-jdk8u275-b01 for changeset eb6ee6a5f2fe
1 /*
2 * Copyright (c) 2014, 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 */
26 package com.sun.tools.javac.comp;
28 import java.util.Collection;
29 import java.util.HashMap;
30 import com.sun.tools.javac.code.Symbol.TypeSymbol;
31 import com.sun.tools.javac.util.Context;
33 /** This class contains the type environments used by Enter, MemberEnter,
34 * Attr, DeferredAttr, and Lower.
35 *
36 * <p><b>This is NOT part of any supported API.
37 * If you write code that depends on this, you do so at your own risk.
38 * This code and its internal interfaces are subject to change or
39 * deletion without notice.</b>
40 */
41 class TypeEnvs {
42 private static final long serialVersionUID = 571524752489954631L;
44 protected static final Context.Key<TypeEnvs> typeEnvsKey = new Context.Key<>();
45 public static TypeEnvs instance(Context context) {
46 TypeEnvs instance = context.get(typeEnvsKey);
47 if (instance == null)
48 instance = new TypeEnvs(context);
49 return instance;
50 }
52 private HashMap<TypeSymbol,Env<AttrContext>> map;
53 protected TypeEnvs(Context context) {
54 map = new HashMap<>();
55 context.put(typeEnvsKey, this);
56 }
58 Env<AttrContext> get(TypeSymbol sym) { return map.get(sym); }
59 Env<AttrContext> put(TypeSymbol sym, Env<AttrContext> env) { return map.put(sym, env); }
60 Env<AttrContext> remove(TypeSymbol sym) { return map.remove(sym); }
61 Collection<Env<AttrContext>> values() { return map.values(); }
62 void clear() { map.clear(); }
63 }