ExpConcat.java

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package plp.expressions2.expression;

import plp.expressions1.util.Tipo;
import plp.expressions2.memory.AmbienteCompilacao;
import plp.expressions2.memory.AmbienteExecucao;
import plp.expressions2.memory.VariavelJaDeclaradaException;
import plp.expressions2.memory.VariavelNaoDeclaradaException;

public class ExpConcat extends ExpBinaria{
  

        public ExpConcat(Expressao esq, Expressao dir){
                super(esq, dir, "++");
        } 

        public Valor avaliar(AmbienteExecucao amb) throws VariavelNaoDeclaradaException, VariavelJaDeclaradaException {
                return new ValorString(
                                        ( (ValorString) getEsq().avaliar(amb)).valor() +
                                        ( (ValorString) getDir().avaliar(amb)).valor()
                );
        }

        protected boolean checaTipoElementoTerminal(AmbienteCompilacao ambiente)
                        throws VariavelNaoDeclaradaException, VariavelJaDeclaradaException {
                return (getEsq().getTipo(ambiente).eString() && getDir().getTipo(ambiente).eString());
        }

        public Tipo getTipo(AmbienteCompilacao ambiente) {
                return Tipo.TIPO_STRING;
        }

}

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