StackHandler.java

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package plp.expressions2.memory;

import java.util.Map;
import java.util.Stack;

import plp.expressions2.expression.Id;

public class StackHandler {
        
        private StackHandler() {
        }
        
        
        public static Object getFromId (Stack stack, Id id) throws IdentificadorNaoDeclaradoException {
                Object result = null;
                Stack auxStack = new Stack();
                while (result == null && !stack.empty()) {
                        Map aux = (Map) stack.pop();
                        auxStack.push(aux);
                        result = aux.get(id);
                }
                while (!auxStack.empty()) {
                        stack.push(auxStack.pop());
                }
                if (result == null) {
                        throw new IdentificadorNaoDeclaradoException();
                } 
                
                return result;
        }

                        
        public static void mapIdObject (Stack stack, Id id, Object object) throws IdentificadorJaDeclaradoException {
                Map aux = (Map) stack.peek();
        if (aux.put(id, object) != null) {
                throw new IdentificadorJaDeclaradoException();
        }
        
        }

}

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