mq5.0-source.main.comm-util.src.main.java.com.sun.messaging.jmq.util.lists.SubSet Maven / Gradle / Ivy
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/*
* @(#)SubSet.java 1.8 08/28/07
*/
package com.sun.messaging.jmq.util.lists;
import java.util.Set;
/**
* this class represents a view into an existing set.
* This subset is different from a copy of a set, because
* changing one affects the other. e.g.
*
* - adding an item to the original set is reflected
* in the subset if the new object should be
* part of the subset
* - adding an item to the subset is reflected
* in the original set
*
*/
public interface SubSet extends Set, EventBroadcaster
{
/**
* Method which allows an object to be added to the
* class for a specific reason.
* @see EventBroadcaster
* @param o object to add
* @param r reason the object was added
* @returns if the item was added to the list
*/
public boolean add(Object o, Reason r);
/**
* Method which allows an object to be removed to the
* class for a specific reason.
* @see EventBroadcaster
* @param o object to remove
* @param r reason the object was removed
* @returns true if the item was removed, false if
* it didnt exist
*/
public boolean remove(Object o, Reason r);
/**
* optional method which tells the
* system it can free up resources.
* If destroy is not called, the
* subset will no longer be maintained
* once the garbage collector frees
* the reference.
*/
public void destroy();
/**
* Used instead of iterator.next(),
* iterator.remove() to remove the first
* item from the list.
* Subsets do not allow iterator.remove() to
* be called because of the risk on
* incorrect state or deadlocks.
*/
public Object removeNext();
public String toDebugString();
public Object peekNext();
}