com.beasys.commerce.util
Class SerializableEnumeration

java.lang.Object
  |
  +--com.beasys.commerce.util.SerializableEnumeration

All Implemented Interfaces:

java.util.Enumeration, java.io.Serializable

public class SerializableEnumeration

extends java.lang.Object

implements java.util.Enumeration, java.io.Serializable

An implementation of the Enumeration interface which is Serializable.

Note: Since most Enumeration implementations aren't Serializable (including Vector.elements() and Collections.enumeration()), we need this to return Enumerations from SessionBeans and other RemoteObjects. Most collection classes are Serializable, so that's nice. However, to make life easier, this uses the underlying Collection's iterator, most of which also aren't Serializable. Therefore, if a partial enumeration has been done before this Enumeration is serialized, the enumeration will start over on the other side because this internally keeps the Collection's Iterator in a transient field (since Iterator aren't generally Serializable).

This is also intentionally not thread-safe.

Since:

2.0.1-sp1

See Also:

Serialized Form

Field Summary

protected java.util.Collection	c The Collection we're fronting for.
protected java.util.Iterator	i The current iterator.

Constructor Summary

SerializableEnumeration(java.util.Collection c)
Constructor.

Method Summary

boolean	hasMoreElements() Tell if this enumeration has more elements.
java.lang.Object	nextElement() Get the next element in the enumeration.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

c

protected java.util.Collection c

The Collection we're fronting for.

i

protected transient java.util.Iterator i

The current iterator.

Constructor Detail

SerializableEnumeration

public SerializableEnumeration(java.util.Collection c)

Constructor.

Parameters:

c - the Collection

Throws:

java.lang.IllegalArgumentException - thrown if c is not Serializable (most Collections are Serializable).

Method Detail

hasMoreElements

public boolean hasMoreElements()

Tell if this enumeration has more elements.

Specified by:

hasMoreElements in interface java.util.Enumeration

nextElement

public java.lang.Object nextElement()

Get the next element in the enumeration.

Specified by:

nextElement in interface java.util.Enumeration