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/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License.  Alternatively, the contents of this file may be used under
 * the terms of the GNU Lesser General Public License Version 2.1 or later,
 * or the Apache License Version 2.0.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 */

package javassist.compiler;

import java.util.HashMap;
import javassist.compiler.ast.Declarator;

public final class SymbolTable extends HashMap {
    private SymbolTable parent;

    public SymbolTable() { this(null); }

    public SymbolTable(SymbolTable p) {
        super();
        parent = p;
    }

    public SymbolTable getParent() { return parent; }

    public Declarator lookup(String name) {
        Declarator found = (Declarator)get(name);
        if (found == null && parent != null)
            return parent.lookup(name);
        else
            return found;
    }

    public void append(String name, Declarator value) {
        put(name, value);
    }
}