/**
*
* 日 期：12-2-27
*/
package com.rop.marshaller;
import com.rop.RopException;
import com.rop.RopMarshaller;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import java.io.OutputStream;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* <pre>
* 将对象流化成XML，每个类型对应一个{@link JAXBContext}，{@link JAXBContext} 是线程安全的，但是
* {@link Marshaller}是非线程安全的，因此需要每次创建一个。
* </pre>
*
* @author 陈雄华
* @version 1.0
*/
public class JaxbXmlRopMarshaller implements RopMarshaller {
private static Map<Class, JAXBContext> jaxbContextHashMap = new ConcurrentHashMap<Class, JAXBContext>();
public void marshaller(Object object, OutputStream outputStream) {
try {
Marshaller m = buildMarshaller(object.getClass());
m.marshal(object, outputStream);
} catch (JAXBException e) {
throw new RopException(e);
}
}
private Marshaller buildMarshaller(Class<?> objectType) throws JAXBException {
if (!jaxbContextHashMap.containsKey(objectType)) {
JAXBContext context = JAXBContext.newInstance(objectType);
jaxbContextHashMap.put(objectType, context);
}
JAXBContext context = jaxbContextHashMap.get(objectType);
Marshaller marshaller = context.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
marshaller.setProperty(Marshaller.JAXB_ENCODING, "utf-8");
return marshaller;
}
}