TypeEnvs.java revision 2571:10fc81ac75b4 
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25266943Sbr
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