aoqi@0: /*
aoqi@0:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.tools.javac.comp;
aoqi@0: 
aoqi@0: import java.util.Collection;
aoqi@0: import java.util.HashMap;
aoqi@0: import com.sun.tools.javac.code.Symbol.TypeSymbol;
aoqi@0: import com.sun.tools.javac.util.Context;
aoqi@0: 
aoqi@0: /** This class contains the type environments used by Enter, MemberEnter,
aoqi@0:  *  Attr, DeferredAttr, and Lower.
aoqi@0:  *
aoqi@0:  *  <p><b>This is NOT part of any supported API.
aoqi@0:  *  If you write code that depends on this, you do so at your own risk.
aoqi@0:  *  This code and its internal interfaces are subject to change or
aoqi@0:  *  deletion without notice.</b>
aoqi@0:  */
aoqi@0: class TypeEnvs {
aoqi@0:     private static final long serialVersionUID = 571524752489954631L;
aoqi@0: 
aoqi@0:     protected static final Context.Key<TypeEnvs> typeEnvsKey = new Context.Key<>();
aoqi@0:     public static TypeEnvs instance(Context context) {
aoqi@0:         TypeEnvs instance = context.get(typeEnvsKey);
aoqi@0:         if (instance == null)
aoqi@0:             instance = new TypeEnvs(context);
aoqi@0:         return instance;
aoqi@0:     }
aoqi@0: 
aoqi@0:     private HashMap<TypeSymbol,Env<AttrContext>> map;
aoqi@0:     protected TypeEnvs(Context context) {
aoqi@0:         map = new HashMap<>();
aoqi@0:         context.put(typeEnvsKey, this);
aoqi@0:     }
aoqi@0: 
aoqi@0:     Env<AttrContext> get(TypeSymbol sym) { return map.get(sym); }
aoqi@0:     Env<AttrContext> put(TypeSymbol sym, Env<AttrContext> env) { return map.put(sym, env); }
aoqi@0:     Env<AttrContext> remove(TypeSymbol sym) { return map.remove(sym); }
aoqi@0:     Collection<Env<AttrContext>> values() { return map.values(); }
aoqi@0:     void clear() { map.clear(); }
aoqi@0: }