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package com.sun.faces.util.copier;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamClass;
import java.io.OutputStream;
import java.io.Serializable;
import java.util.LinkedList;
import java.util.Queue;
/**
* Copier that copies an object by serializing and subsequently deserializing it
* again.
*
* As per the platform serialization rules, the object and all its non transient
* dependencies have to implement the {@link Serializable} interface.
*
* @since 2.3
* @author Arjan Tijms
*
*/
public class SerializationCopier implements Copier {
private static final String SERIALIZATION_COPIER_ERROR
= "SerializationCopier cannot be used in this case. Please try other copier (e.g. MultiStrategyCopier, NewInstanceCopier, CopyCtorCopier, CloneCopier).";
@Override
public Object copy(Object object) {
if (!(object instanceof Serializable)) {
throw new IllegalStateException("Can't copy object of type " + object.getClass() + " since it doesn't implement Serializable");
}
try {
return copyOutIn(object);
} catch (IOException | ClassNotFoundException e) {
throw new IllegalArgumentException(SERIALIZATION_COPIER_ERROR);
}
}
@SuppressWarnings("unchecked")
private static T copyOutIn(T object) throws ClassNotFoundException, IOException {
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
Out out = new Out(byteArrayOutputStream);
out.writeObject(object);
byte[] bytes = byteArrayOutputStream.toByteArray();
ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes);
In in = new In(byteArrayInputStream, out);
@SuppressWarnings("unchecked")
T cloned = (T) in.readObject();
return cloned;
}
private static class In extends ObjectInputStream {
private final Out out;
In(InputStream inputStream, Out out) throws IOException {
super(inputStream);
this.out = out;
}
@Override
protected Class resolveProxyClass(String[] interfaceNames)
throws IOException, ClassNotFoundException {
return out.queue.poll();
}
@Override
protected Class resolveClass(ObjectStreamClass objectStreamClass)
throws IOException, ClassNotFoundException {
String actuallyfound = null;
Class pollclass = out.queue.poll();
if (pollclass != null) {
actuallyfound = pollclass.getName();
}
if (!objectStreamClass.getName().equals(actuallyfound)) {
throw new IllegalArgumentException(SERIALIZATION_COPIER_ERROR);
}
return pollclass;
}
}
private static class Out extends ObjectOutputStream {
Queue> queue = new LinkedList<>();
Out(OutputStream out) throws IOException {
super(out);
}
@Override
protected void annotateClass(Class c) {
queue.add(c);
}
@Override
protected void annotateProxyClass(Class c) {
queue.add(c);
}
}
}