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
26package com.sun.tools.javac.comp;
27
28import java.util.Collection;
29import java.util.HashMap;
30import com.sun.tools.javac.code.Symbol.TypeSymbol;
31import 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 */
41class TypeEnvs {
42    private static final long serialVersionUID = 571524752489954631L;
43
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    }
51
52    private HashMap<TypeSymbol,Env<AttrContext>> map;
53    protected TypeEnvs(Context context) {
54        map = new HashMap<>();
55        context.put(typeEnvsKey, this);
56    }
57
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}
64