# MixedCollection.js

    /**
     * @class Ext.util.MixedCollection
     * @extends Ext.util.Observable
     * A Collection class that maintains both numeric indexes and keys and exposes events.
     * @constructor
     * @param {Boolean} allowFunctions True if the addAll function should add function references to the
     * collection (defaults to false)
     * @param {Function} keyFn A function that can accept an item of the type(s) stored in this MixedCollection
     * and return the key value for that item.  This is used when available to look up the key on items that
     * were passed without an explicit key parameter to a MixedCollection method.  Passing this parameter is
     * equivalent to providing an implementation for the {@link #getKey} method.
     */
    Ext.util.MixedCollection = function(allowFunctions, keyFn){
        this.items = [];
        this.map = {};
        this.keys = [];
        this.length = 0;
        this.addEvents({
            /**
             * @event clear
             * Fires when the collection is cleared.
             */
            "clear" : true,
            /**
             * @event add
             * Fires when an item is added to the collection.
             * @param {Number} index The index at which the item was added.
             * @param {Object} o The item added.
             * @param {String} key The key associated with the added item.
             */
            "add" : true,
            /**
             * @event replace
             * Fires when an item is replaced in the collection.
             * @param {String} key he key associated with the new added.
             * @param {Object} old The item being replaced.
             * @param {Object} new The new item.
             */
            "replace" : true,
            /**
             * @event remove
             * Fires when an item is removed from the collection.
             * @param {Object} o The item being removed.
             * @param {String} key (optional) The key associated with the removed item.
             */
            "remove" : true,
            "sort" : true
        });
        this.allowFunctions = allowFunctions === true;
        if(keyFn){
            this.getKey = keyFn;
        }
        Ext.util.MixedCollection.superclass.constructor.call(this);
    };

    Ext.extend(Ext.util.MixedCollection, Ext.util.Observable, {
        allowFunctions : false,

    /**
     * Adds an item to the collection.
     * @param {String} key The key to associate with the item
     * @param {Object} o The item to add.
     * @return {Object} The item added.
     */
        add : function(key, o){
            if(arguments.length == 1){
                o = arguments[0];
                key = this.getKey(o);
            }
            if(typeof key == "undefined" || key === null){
                this.length++;
                this.items.push(o);
                this.keys.push(null);
            }else{
                var old = this.map[key];
                if(old){
                    return this.replace(key, o);
                }
                this.length++;
                this.items.push(o);
                this.map[key] = o;
                this.keys.push(key);
            }
            this.fireEvent("add", this.length-1, o, key);
            return o;
        },

    /**
      * MixedCollection has a generic way to fetch keys if you implement getKey.
        <pre><code>
        // normal way
        var mc = new Ext.util.MixedCollection();
        mc.add(someEl.dom.id, someEl);
        mc.add(otherEl.dom.id, otherEl);
        //and so on

        // using getKey
        var mc = new Ext.util.MixedCollection();
        mc.getKey = function(el){
           return el.dom.id;
        }
        mc.add(someEl);
        mc.add(otherEl);
        // etc
        </code>
     * @param o {Object} The item for which to find the key.
     * @return {Object} The key for the passed item.
     */
        getKey : function(o){
             return o.id;
        },

    /**
     * Replaces an item in the collection.
     * @param {String} key The key associated with the item to replace, or the item to replace.
     * @param o {Object} o (optional) If the first parameter passed was a key, the item to associate with that key.
     * @return {Object}  The new item.
     */
        replace : function(key, o){
            if(arguments.length == 1){
                o = arguments[0];
                key = this.getKey(o);
            }
            var old = this.item(key);
            if(typeof key == "undefined" || key === null || typeof old == "undefined"){
                 return this.add(key, o);
            }
            var index = this.indexOfKey(key);
            this.items[index] = o;
            this.map[key] = o;
            this.fireEvent("replace", key, old, o);
            return o;
        },

    /**
     * Adds all elements of an Array or an Object to the collection.
     * @param {Object/Array} objs An Object containing properties which will be added to the collection, or
     * an Array of values, each of which are added to the collection.
     */
        addAll : function(objs){
            if(arguments.length > 1 || objs instanceof Array){
                var args = arguments.length > 1 ? arguments : objs;
                for(var i = 0, len = args.length; i < len; i++){
                    this.add(args[i]);
                }
            }else{
                for(var key in objs){
                    if(this.allowFunctions || typeof objs[key] != "function"){
                        this.add(objs[key], key);
                    }
                }
            }
        },

    /**
     * Executes the specified function once for every item in the collection, passing each
     * item as the first and only parameter. returning false from the function will stop the iteration.
     * @param {Function} fn The function to execute for each item.
     * @param {Object} scope (optional) The scope in which to execute the function.
     */
        each : function(fn, scope){
            var items = [].concat(this.items); // each safe for removal
            for(var i = 0, len = items.length; i < len; i++){
                if(fn.call(scope || items[i], items[i], i, len) === false){
                    break;
                }
            }
        },

    /**
     * Executes the specified function once for every key in the collection, passing each
     * key, and its associated item as the first two parameters.
     * @param {Function} fn The function to execute for each item.
     * @param {Object} scope (optional) The scope in which to execute the function.
     */
        eachKey : function(fn, scope){
            for(var i = 0, len = this.keys.length; i < len; i++){
                fn.call(scope || window, this.keys[i], this.items[i], i, len);
            }
        },

    /**
     * Returns the first item in the collection which elicits a true return value from the
     * passed selection function.
     * @param {Function} fn The selection function to execute for each item.
     * @param {Object} scope (optional) The scope in which to execute the function.
     * @return {Object} The first item in the collection which returned true from the selection function.
     */
        find : function(fn, scope){
            for(var i = 0, len = this.items.length; i < len; i++){
                if(fn.call(scope || window, this.items[i], this.keys[i])){
                    return this.items[i];
                }
            }
            return null;
        },

    /**
     * Inserts an item at the specified index in the collection.
     * @param {Number} index The index to insert the item at.
     * @param {String} key The key to associate with the new item, or the item itself.
     * @param {Object} o  (optional) If the second parameter was a key, the new item.
     * @return {Object} The item inserted.
     */
        insert : function(index, key, o){
            if(arguments.length == 2){
                o = arguments[1];
                key = this.getKey(o);
            }
            if(index >= this.length){
                return this.add(key, o);
            }
            this.length++;
            this.items.splice(index, 0, o);
            if(typeof key != "undefined" && key != null){
                this.map[key] = o;
            }
            this.keys.splice(index, 0, key);
            this.fireEvent("add", index, o, key);
            return o;
        },

    /**
     * Removed an item from the collection.
     * @param {Object} o The item to remove.
     * @return {Object} The item removed.
     */
        remove : function(o){
            return this.removeAt(this.indexOf(o));
        },

    /**
     * Remove an item from a specified index in the collection.
     * @param {Number} index The index within the collection of the item to remove.
     */
        removeAt : function(index){
            if(index < this.length && index >= 0){
                this.length--;
                var o = this.items[index];
                this.items.splice(index, 1);
                var key = this.keys[index];
                if(typeof key != "undefined"){
                    delete this.map[key];
                }
                this.keys.splice(index, 1);
                this.fireEvent("remove", o, key);
            }
        },

    /**
     * Removed an item associated with the passed key fom the collection.
     * @param {String} key The key of the item to remove.
     */
        removeKey : function(key){
            return this.removeAt(this.indexOfKey(key));
        },

    /**
     * Returns the number of items in the collection.
     * @return {Number} the number of items in the collection.
     */
        getCount : function(){
            return this.length;
        },

    /**
     * Returns index within the collection of the passed Object.
     * @param {Object} o The item to find the index of.
     * @return {Number} index of the item.
     */
        indexOf : function(o){
            if(!this.items.indexOf){
                for(var i = 0, len = this.items.length; i < len; i++){
                    if(this.items[i] == o) return i;
                }
                return -1;
            }else{
                return this.items.indexOf(o);
            }
        },

    /**
     * Returns index within the collection of the passed key.
     * @param {String} key The key to find the index of.
     * @return {Number} index of the key.
     */
        indexOfKey : function(key){
            if(!this.keys.indexOf){
                for(var i = 0, len = this.keys.length; i < len; i++){
                    if(this.keys[i] == key) return i;
                }
                return -1;
            }else{
                return this.keys.indexOf(key);
            }
        },

    /**
     * Returns the item associated with the passed key OR index. Key has priority over index.
     * @param {String/Number} key The key or index of the item.
     * @return {Object} The item associated with the passed key.
     */
        item : function(key){
            var item = typeof this.map[key] != "undefined" ? this.map[key] : this.items[key];
            return typeof item != 'function' || this.allowFunctions ? item : null; // for prototype!
        },

    /**
     * Returns the item at the specified index.
     * @param {Number} index The index of the item.
     * @return {Object}
     */
        itemAt : function(index){
            return this.items[index];
        },

    /**
     * Returns the item associated with the passed key.
     * @param {String/Number} key The key of the item.
     * @return {Object} The item associated with the passed key.
     */
        key : function(key){
            return this.map[key];
        },

    /**
     * Returns true if the collection contains the passed Object as an item.
     * @param {Object} o  The Object to look for in the collection.
     * @return {Boolean} True if the collection contains the Object as an item.
     */
        contains : function(o){
            return this.indexOf(o) != -1;
        },

    /**
     * Returns true if the collection contains the passed Object as a key.
     * @param {String} key The key to look for in the collection.
     * @return {Boolean} True if the collection contains the Object as a key.
     */
        containsKey : function(key){
            return typeof this.map[key] != "undefined";
        },

    /**
     * Removes all items from the collection.
     */
        clear : function(){
            this.length = 0;
            this.items = [];
            this.keys = [];
            this.map = {};
            this.fireEvent("clear");
        },

    /**
     * Returns the first item in the collection.
     * @return {Object} the first item in the collection..
     */
        first : function(){
            return this.items[0];
        },

    /**
     * Returns the last item in the collection.
     * @return {Object} the last item in the collection..
     */
        last : function(){
            return this.items[this.length-1];
        },

        _sort : function(property, dir, fn){
            var dsc = String(dir).toUpperCase() == "DESC" ? -1 : 1;
            fn = fn || function(a, b){
                return a-b;
            };
            var c = [], k = this.keys, items = this.items;
            for(var i = 0, len = items.length; i < len; i++){
                c[c.length] = {key: k[i], value: items[i], index: i};
            }
            c.sort(function(a, b){
                var v = fn(a[property], b[property]) * dsc;
                if(v == 0){
                    v = (a.index < b.index ? -1 : 1);
                }
                return v;
            });
            for(var i = 0, len = c.length; i < len; i++){
                items[i] = c[i].value;
                k[i] = c[i].key;
            }
            this.fireEvent("sort", this);
        },

        /**
         * Sorts this collection with the passed comparison function
         * @param {String} direction (optional) "ASC" or "DESC"
         * @param {Function} fn (optional) comparison function
         */
        sort : function(dir, fn){
            this._sort("value", dir, fn);
        },

        /**
         * Sorts this collection by keys
         * @param {String} direction (optional) "ASC" or "DESC"
         * @param {Function} fn (optional) a comparison function (defaults to case insensitive string)
         */
        keySort : function(dir, fn){
            this._sort("key", dir, fn || function(a, b){
                return String(a).toUpperCase()-String(b).toUpperCase();
            });
        },

        /**
         * Returns a range of items in this collection
         * @param {Number} startIndex (optional) defaults to 0
         * @param {Number} endIndex (optional) default to the last item
         * @return {Array} An array of items
         */
        getRange : function(start, end){
            var items = this.items;
            if(items.length < 1){
                return [];
            }
            start = start || 0;
            end = Math.min(typeof end == "undefined" ? this.length-1 : end, this.length-1);
            var r = [];
            if(start <= end){
                for(var i = start; i <= end; i++) {
            	    r[r.length] = items[i];
                }
            }else{
                for(var i = start; i >= end; i--) {
            	    r[r.length] = items[i];
                }
            }
            return r;
        },

        /**
         * Filter the <i>objects</i> in this collection by a specific property.
         * Returns a new collection that has been filtered.
         * @param {String} property A property on your objects
         * @param {String/RegExp} value Either string that the property values
         * should start with or a RegExp to test against the property
         * @return {MixedCollection} The new filtered collection
         */
        filter : function(property, value){
            if(!value.exec){ // not a regex
                value = String(value);
                if(value.length == 0){
                    return this.clone();
                }
                value = new RegExp("^" + Ext.escapeRe(value), "i");
            }
            return this.filterBy(function(o){
                return o && value.test(o[property]);
            });
    	},

        /**
         * Filter by a function. * Returns a new collection that has been filtered.
         * The passed function will be called with each
         * object in the collection. If the function returns true, the value is included
         * otherwise it is filtered.
         * @param {Function} fn The function to be called, it will receive the args o (the object), k (the key)
         * @param {Object} scope (optional) The scope of the function (defaults to this)
         * @return {MixedCollection} The new filtered collection
         */
        filterBy : function(fn, scope){
            var r = new Ext.util.MixedCollection();
            r.getKey = this.getKey;
            var k = this.keys, it = this.items;
            for(var i = 0, len = it.length; i < len; i++){
                if(fn.call(scope||this, it[i], k[i])){
    				r.add(k[i], it[i]);
    			}
            }
            return r;
        },

        /**
         * Creates a duplicate of this collection
         * @return {MixedCollection}
         */
        clone : function(){
            var r = new Ext.util.MixedCollection();
            var k = this.keys, it = this.items;
            for(var i = 0, len = it.length; i < len; i++){
                r.add(k[i], it[i]);
            }
            r.getKey = this.getKey;
            return r;
        }
    });
    /**
     * Returns the item associated with the passed key or index.
     * @method
     * @param {String/Number} key The key or index of the item.
     * @return {Object} The item associated with the passed key.
     */
    Ext.util.MixedCollection.prototype.get = Ext.util.MixedCollection.prototype.item;

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