davmail/src/java/davmail/exchange/XMLStreamUtil.java

package davmail.exchange;

import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.io.IOException;
import java.io.InputStream;

/**
 * XmlStreamReader utility methods
 */
public class XMLStreamUtil {
    private XMLStreamUtil() {
    }

    public static XMLInputFactory getXmlInputFactory() {
           XMLInputFactory inputFactory = XMLInputFactory.newInstance();
            inputFactory.setProperty(XMLInputFactory.IS_COALESCING, Boolean.TRUE);
            inputFactory.setProperty(XMLInputFactory.IS_REPLACING_ENTITY_REFERENCES, Boolean.TRUE);
        return inputFactory;
    }

    public static String getElementContentByLocalName(InputStream inputStream, String localName) throws IOException {
        String elementContent = null;
         XMLStreamReader reader = null;
        try {
            XMLInputFactory inputFactory = getXmlInputFactory();

            reader = inputFactory.createXMLStreamReader(inputStream);
            boolean inElement = false;
            while (reader.hasNext()) {
                int event = reader.next();
                if (event == XMLStreamConstants.START_ELEMENT && localName.equals(reader.getLocalName())) {
                    inElement = true;
                } else if (event == XMLStreamConstants.CHARACTERS && inElement) {
                    elementContent = reader.getText();
                    inElement = false;
                }
            }
        } catch (XMLStreamException e) {
            throw new IOException(e.getMessage());
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (XMLStreamException e) {
                ExchangeSession.LOGGER.error(e);
            }
        }
        return elementContent;
    }
}