/*
* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.io;
/**
* Context during upcalls from object stream to class-defined
* readObject/writeObject methods.
* Holds object currently being deserialized and descriptor for current class.
*
* This context keeps track of the thread it was constructed on, and allows
* only a single call of defaultReadObject, readFields, defaultWriteObject
* or writeFields which must be invoked on the same thread before the class's
* readObject/writeObject method has returned.
* If not set to the current thread, the getObj method throws NotActiveException.
*/
final class SerialCallbackContext {
private final Object obj;
private final ObjectStreamClass desc;
/**
* Thread this context is in use by.
* As this only works in one thread, we do not need to worry about thread-safety.
*/
private Thread thread;
public SerialCallbackContext(Object obj, ObjectStreamClass desc) {
this.obj = obj;
this.desc = desc;
this.thread = Thread.currentThread();
}
public Object getObj() throws NotActiveException {
checkAndSetUsed();
return obj;
}
public ObjectStreamClass getDesc() {
return desc;
}
private void checkAndSetUsed() throws NotActiveException {
if (thread != Thread.currentThread()) {
throw new NotActiveException(
"not in readObject invocation or fields already read");
}
thread = null;
}
public void setUsed() {
thread = null;
}
}