17.java

package it.uniroma1.dis.wsngroup.gexf4j.core.impl.writer;

import static com.google.common.base.Preconditions.checkArgument;

import it.uniroma1.dis.wsngroup.gexf4j.core.dynamic.TimeFormat;

import java.text.SimpleDateFormat;
import java.util.Date;

import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;

public abstract class AbstractEntityWriter<T extends Object> {

    protected static String writerTimeType = TimeFormat.DOUBLE;

    protected static String toDouble(Object number) {
        String returnValue = null;
        if (number instanceof Double) {
            Double n = (Double) number;
            returnValue = String.valueOf(n);
        }
        return returnValue;
    }

    protected static String toInteger(Object number) {
        String returnValue = null;
        if (number instanceof Integer) {
            Integer n = (Integer) number;
            returnValue = String.valueOf(n);
        }
        return returnValue;
    }

    protected String toDateString(Object date) {
        String returnValue = null;
        if (date instanceof Date) {
        	SimpleDateFormat sdfDate = new SimpleDateFormat("yyyy-MM-dd");
            Date d = (Date) date;
            returnValue = sdfDate.format(d);
        }
        return returnValue;
    }

    protected String toDateTimeString(Object date) {
        String returnValue = null;
        if (date instanceof Date) {
        	SimpleDateFormat sdfDateTime = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
            Date d = (Date) date;
            returnValue = sdfDateTime.format(d);
        }
        return returnValue;
    }
    protected XMLStreamWriter writer = null;
    protected T entity = null;

    protected abstract String getElementName();

    protected abstract void writeAttributes() throws XMLStreamException;

    protected abstract void writeElements() throws XMLStreamException;

    public AbstractEntityWriter(XMLStreamWriter writer, T entity) {
        checkArgument(writer != null, "XML Writer cannot be null.");
        checkArgument(entity != null, "Entity cannot be null.");

        this.writer = writer;
        this.entity = entity;
    }

    protected void write() {
        try {
            writeStartElement();

            writeAttributes();
            writeElements();

            writer.writeEndElement();

        } catch (XMLStreamException e) {
            e.printStackTrace();
        }
    }

    protected void writeStartElement() throws XMLStreamException {
        writer.writeStartElement(getElementName());
    }
}