
/*
 * weinre is available under *either* the terms of the modified BSD license *or* the
 * MIT License (2008). See http://opensource.org/licenses/alphabetical for full text.
 * 
 * Copyright (c) 2011 IBM Corporation
 */

//-----------------------------------------------------------------------------
class IDGenerator

//-----------------------------------------------------------------------------
init
    var nextIdValue = 1
    var idName      = "__weinre__id"

//-----------------------------------------------------------------------------
static method checkId(object)
    return object[idName]
    
//-----------------------------------------------------------------------------
static method getId(object, map)
    var id = IDGenerator.checkId(object)
    
    if (!id) {
        id = nextId()
        
        // note:
        // attempted to use Object.defineProperty() to make
        // the id property non-enumerable, etc, but doesn't 
        // work in JSC (TypeError), and still shows up in
        // Web Inspector property views anyway.
        object[idName] = id
    }
    
    if (map) {
        if (map[id] != object) {
            map[id] = object
        }
    }
    
    return id

//-----------------------------------------------------------------------------
static method next
    return nextId()

//-----------------------------------------------------------------------------
function nextId
    var result = nextIdValue
    nextIdValue += 1
    return result