map.coffee

class Map
    constructor : -> 
        @entry = {}
        @count = 0
    
    size : -> 
        return @count
    
    isEmpty : -> 
        return @count == 0
    
    containsKey : (key) ->
        if @isEmpty()
            return false
        return @entry.hasOwnProperty key
    
    containsValue : (val)->
        if @isEmpty()
            return false
        for key,_val of @entry
            if _val == val
                return true
        return false
    
    get : (key)->
        if @isEmpty()
            return null
        if @containsKey key
            return @entry[key]     
        return null
    
    put : (key, val)->
        if !@entry.hasOwnProperty key
            @count += 1;  
        @entry[key] = val
        return @
    
    remove : (key)-> 
        if @isEmpty()
            return false
        if @containsKey key
            delete @entry[key]
            @count -= 1
            return true
        return false    
    
    putAll : (map)->  
        if !map instanceof Map
            return false
        entry = map.entry
        for key,val of entry
            @put(key, val)
        return true
    
    clear : ->
        @entry = {}
        @count = 0
        return @ 
    
    values : ->  
        vals = []
        for key,val of @entry
            vals.push val
        return vals
        
    keySet : ->  
        keys = []
        for key,val of @entry
            keys.push key
        return keys
    
    entrySet : ->  
        return @entry
    
    toString : ->  
        if typeof JSON == "undefined"
            throw new Error "JSON object is not supported. Please check your browser version (IE8+, Firefox11+, Chrome19+, Safari5.1+)."
        return JSON.stringify @entry
    
    valueOf : ->  
        return @toString()