/*******************************************************************************
* CogTool Copyright Notice and Distribution Terms
* CogTool 1.3, Copyright (c) 2005-2013 Carnegie Mellon University
* This software is distributed under the terms of the FSF Lesser
* Gnu Public License (see LGPL.txt).
*
* CogTool is free software; you can redistribute it and/or modify
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* the Free Software Foundation; either version 2.1 of the License, or
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*
* CogTool is distributed in the hope that it will be useful,
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* following notices:
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* Eclipse SWT version 3.448
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* CLISP version 2.38
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* Copyright (c) Sam Steingold, Bruno Haible 2001-2006
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* Mozilla XULRunner 1.9.0.5
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******************************************************************************/
package edu.cmu.cs.hcii.cogtool.model;
import java.util.EventObject;
/**
* Semantic change for methods that add or remove elements from a list.
* <p>
* Elements can be added <em>before</em> an existing member in the
* list or at the end of the list. Thus, if the change
* is an add and the specified index is not <code>AT_END</code>,
* the newly added element goes before the existing element at that
* index, which is zero-based. (Thus, it is equivalent to adding
* the new element at the end if the index is equal to the old count
* of elements held by the list.)
* <p>
* It is intended that this class not be instantiated directly.
* Instead, it should be subclassed with constructors that have
* properly typed parameters.
*
* @author mlh
*/
public abstract class ListChange extends EventObject
{
/**
* Constant flag indicating that the add happened at end of the list.
*/
public static final int AT_END = -1;
/**
* The element added or removed. Must be properly down-cast.
*/
public Object element;
/**
* The location as to where the element was added to or removed from.
*/
public int atIndex;
/**
* Whether the change was an add or remove.
*/
public boolean isAdd;
/**
* Initialize the semantic change relative to a specific index.
*
* @param srcObj the list that was modified
* @param eltChg the element added or removed
* @param index where the element was added before or removed from
* @param add a flag indicating whether the change is an add
* or a remove
* @author mlh
*/
public ListChange(Object srcObj, Object eltChg, int index, boolean add)
{
super(srcObj);
element = eltChg;
atIndex = index;
isAdd = add;
}
/**
* Initialize the semantic change representing an add at the end.
* <p>
* Note that it makes little sense to specify a delete from the end!
*
* @param srcObj the list that was modified
* @param eltChg the element added
* @author mlh
*/
public ListChange(Object srcObj, Object eltChg)
{
this(srcObj, eltChg, AT_END, true);
}
}