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  */
25 
26 package com.sun.tools.javac.comp;
27 
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;
32 
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;
43 
44     protected static final Context.Key<TypeEnvs> typeEnvsKey = new Context.Key<>();
instance(Context context)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     }
51 
52     private HashMap<TypeSymbol,Env<AttrContext>> map;
TypeEnvs(Context context)53     protected TypeEnvs(Context context) {
54         map = new HashMap<>();
55         context.put(typeEnvsKey, this);
56     }
57 
get(TypeSymbol sym)58     Env<AttrContext> get(TypeSymbol sym) { return map.get(sym); }
put(TypeSymbol sym, Env<AttrContext> env)59     Env<AttrContext> put(TypeSymbol sym, Env<AttrContext> env) { return map.put(sym, env); }
remove(TypeSymbol sym)60     Env<AttrContext> remove(TypeSymbol sym) { return map.remove(sym); }
values()61     Collection<Env<AttrContext>> values() { return map.values(); }
clear()62     void clear() { map.clear(); }
63 }
64