org.jboss.marshalling.serial.ExternalizedObject Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.marshalling.serial;
import java.io.Externalizable;
import java.io.ObjectOutput;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.InvalidClassException;
import java.io.ObjectStreamException;
import org.jboss.marshalling.Externalizer;
/**
* An externalized object. This wrapper allows an object that was written with an {@code Externalizer} to be read by
* standard Java serialization. Note that if an externalized object's child object graph ever refers to the original
* object, there will be an error in the reconstructed object graph such that those references will refer to this
* wrapper object rather than the properly externalized object.
*/
public final class ExternalizedObject implements Externalizable {
private static final long serialVersionUID = -7764783599281227099L;
private Externalizer externalizer;
private transient Object obj;
public ExternalizedObject() {
}
public ExternalizedObject(final Externalizer externalizer, final Object obj) {
this.externalizer = externalizer;
this.obj = obj;
}
/**
* {@inheritDoc}
*/
public void writeExternal(final ObjectOutput out) throws IOException {
out.writeObject(obj.getClass());
out.writeObject(externalizer);
externalizer.writeExternal(obj, out);
}
/**
* {@inheritDoc}
*/
public void readExternal(final ObjectInput in) throws IOException, ClassNotFoundException {
Class subject = (Class) in.readObject();
externalizer = (Externalizer) in.readObject();
final Object o = externalizer.createExternal(subject, in);
obj = o;
}
/**
* Return the externalized object after {@code readExternal()} completes.
*
* @return the externalized object
*
* @throws ObjectStreamException never
*/
protected Object readResolve() {
return obj;
}
/**
* {@inheritDoc}
*/
public T create(final Class clazz) throws InvalidClassException {
try {
return clazz.newInstance();
} catch (Exception e) {
final InvalidClassException ee = new InvalidClassException(clazz.getName(), e.getMessage());
ee.initCause(e);
throw ee;
}
}
}