/*******************************************************************************
* Copyright (c) 2006, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.core.dom.lrparser.symboltable;
/**
* A facade for a FunctionalMap that is used just to track typedef
* declarations.
*
* This class acts like a set. No information needs to be associated
* with a typedef declaration, all we need to know is if the identifier
* has been declared as a typedef.
*
* @author Mike Kucera
*/
public class TypedefSymbolTable {
/**
* Start with EMPTY_TABLE and build up a symbol table using add().
*/
public static final TypedefSymbolTable EMPTY_TABLE = new TypedefSymbolTable();
// the map we are providing a facade for
private final FunctionalMap<String,Object> map;
/**
* Constructors are private, start with EMPTY_TABLE
* and build it up using insert().
*/
private TypedefSymbolTable() {
map = FunctionalMap.emptyMap();
}
private TypedefSymbolTable(FunctionalMap<String,Object> newRoot) {
map = newRoot;
}
public TypedefSymbolTable add(String typedefIdent) {
return new TypedefSymbolTable(map.insert(typedefIdent, null));
}
public boolean contains(String typedef) {
return map.containsKey(typedef);
}
public int size() {
return map.size();
}
public boolean isEmpty() {
return map.size() == 0;
}
@Override public String toString() {
return map.toString();
}
}