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API Java para consumo do WebService de MDFe
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package br.com.swconsultoria.mdfe.util;

import br.com.swconsultoria.mdfe.dom.ConfiguracoesMDFe;
import br.com.swconsultoria.mdfe.exception.MdfeException;
import org.xml.sax.ErrorHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXParseException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.StringReader;

public class Valida implements ErrorHandler {

    protected static String xsd;
    protected static ConfiguracoesMDFe configuracoes;
    private String listaComErrosDeValidacao;

    /**
     * Construtor privado
     */
    protected Valida() {
        this.listaComErrosDeValidacao = "";
    }


    protected String validateXml(String xml, String xsd) throws MdfeException {

        DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
        docBuilderFactory.setValidating(true);
        docBuilderFactory.setNamespaceAware(true);
        docBuilderFactory.setAttribute("http://java.sun.com/xml/jaxp/properties/schemaLanguage",
                "http://www.w3.org/2001/XMLSchema");
        docBuilderFactory.setAttribute("http://java.sun.com/xml/jaxp/properties/schemaSource", xsd);
        DocumentBuilder builder;
        try {
            builder = docBuilderFactory.newDocumentBuilder();
            builder.setErrorHandler(this);
        } catch (ParserConfigurationException ex) {
            throw new MdfeException(ex.getMessage());
        }

        try {
            builder.parse(new InputSource(new StringReader(xml)));
        } catch (Exception ex) {
            throw new MdfeException(ex.toString());
        }

        return this.getListaComErrosDeValidacao();
    }

    @Override
    public void error(SAXParseException exception) {

        if (isError(exception)) {
            listaComErrosDeValidacao += tratamentoRetorno(exception.getMessage());
        }
    }

    @Override
    public void fatalError(SAXParseException exception) {

        listaComErrosDeValidacao += tratamentoRetorno(exception.getMessage());
    }

    @Override
    public void warning(SAXParseException exception) {

        listaComErrosDeValidacao += tratamentoRetorno(exception.getMessage());
    }

    private String tratamentoRetorno(String message) {

        message = message.replaceAll("cvc-type.3.1.3:", "-");
        message = message.replaceAll("cvc-attribute.3:", "-");
        message = message.replaceAll("cvc-complex-type.2.4.a:", "-");
        message = message.replaceAll("cvc-complex-type.2.4.b:", "-");
        message = message.replaceAll("The value", "O valor");
        message = message.replaceAll("of element", "do campo");
        message = message.replaceAll("is not valid", "nao é valido");
        message = message.replaceAll("Invalid content was found starting with element", "Encontrado o campo");
        message = message.replaceAll("One of", "Campo(s)");
        message = message.replaceAll("is expected", "é obrigatorio");
        message = message.replaceAll("\\{", "");
        message = message.replaceAll("\\}", "");
        message = message.replaceAll("\"", "");
        message = message.replaceAll("http://www.portalfiscal.inf.br/nfe:", "");
        return System.getProperty("line.separator") + message.trim();
    }

    public String getListaComErrosDeValidacao() {

        return listaComErrosDeValidacao;
    }

    private boolean isError(SAXParseException exception) {

        return !exception.getMessage().startsWith("cvc-enumeration-valid") && !exception.getMessage().startsWith("cvc-pattern-valid") && !exception.getMessage().startsWith("cvc-maxLength-valid") && !exception.getMessage().startsWith("cvc-datatype");
    }

}