XmlReadDBItemConvertion.java

package br.com.citframework.util;

import java.io.File;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collection;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

public class XmlReadDBItemConvertion {

    private static final Logger LOGGER = Logger.getLogger(XmlReadDBItemConvertion.class);

    private static final String ERROR_BUILDER_PARSE = "Erro ao construir documento XML a partir do arquivo de CONVERSOES DE BANCO DE DADOS!";
    private static XmlReadDBItemConvertion xmlReaderItemConvertion = null;
    private Document doc = null;
    private static Collection<DBItemConvertion> colItens = null;

    public static XmlReadDBItemConvertion getInstance(final String dbName) {
        if (xmlReaderItemConvertion == null) {
            final String strNameDb = dbName.toLowerCase();
            xmlReaderItemConvertion = new XmlReadDBItemConvertion(XmlReadDBItemConvertion.class.getResourceAsStream("/" + strNameDb + "-convert.xml"));
        }
        return xmlReaderItemConvertion;
    }

    public XmlReadDBItemConvertion(final InputStream ioos) {
        if (ioos == null) {
            LOGGER.info("XmlReadDBItemConvertion :: InputStream ioos IS NULL!!!");
            return;
        }
        final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        try {
            final DocumentBuilder builder = factory.newDocumentBuilder();
            doc = builder.parse(ioos);
        } catch (final Exception e) {
            LOGGER.error(ERROR_BUILDER_PARSE, e);
        }
    }

    public XmlReadDBItemConvertion(final String file) {
        final DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        try {
            final DocumentBuilder builder = factory.newDocumentBuilder();
            doc = builder.parse(new File(file));
        } catch (final Exception e) {
            LOGGER.error(ERROR_BUILDER_PARSE, e);
        }
    }

    public Collection<DBItemConvertion> getItens() {
        if (colItens != null) {
            return colItens;
        }
        colItens = new ArrayList<DBItemConvertion>();

        if (doc == null) {
            return null;
        }

        final Node noRoot = doc.getChildNodes().item(0);
        String nameToBeConverted = StringUtils.EMPTY;
        String nameAfterConversion = StringUtils.EMPTY;
        for (int j = 0; j < noRoot.getChildNodes().getLength(); j++) {
            final Node noLookup = noRoot.getChildNodes().item(j);
            if (noLookup.getNodeName().equals("#text") || noLookup.getNodeName().equals("#comment")) {
                continue;
            }
            final NamedNodeMap map = noLookup.getAttributes();
            nameToBeConverted = map.getNamedItem("nameToBeConverted").getNodeValue();
            nameAfterConversion = map.getNamedItem("nameAfterConversion").getNodeValue();

            final DBItemConvertion dbItemConvertion = new DBItemConvertion();
            dbItemConvertion.setNameToBeConverted(nameToBeConverted);
            dbItemConvertion.setNameAfterConversion(nameAfterConversion);

            if (nameAfterConversion != null && !nameAfterConversion.equalsIgnoreCase("")) {
                colItens.add(dbItemConvertion);
            }
        }
        return colItens;
    }

}