wisemapping-open-source/mindplot/src/main/javascript/commands/GenericFunctionCommand.js

/*
*    Copyright [2011] [wisemapping]
*
*   Licensed under WiseMapping Public License, Version 1.0 (the "License").
*   It is basically the Apache License, Version 2.0 (the "License") plus the
*   "powered by wisemapping" text requirement on every single page;
*   you may not use this file except in compliance with the License.
*   You may obtain a copy of the license at
*
*       http://www.wisemapping.org/license
*
*   Unless required by applicable law or agreed to in writing, software
*   distributed under the License is distributed on an "AS IS" BASIS,
*   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*   See the License for the specific language governing permissions and
*   limitations under the License.
*/

mindplot.commands.GenericFunctionCommand =new Class(
{
    Extends:mindplot.Command,
   initialize: function(commandFunc,value,topicsIds)
    {
        $assert(commandFunc, "commandFunc must be defined");
        $assert(topicsIds, "topicsIds must be defined");
        this._value = value;
        this._selectedObjectsIds = topicsIds;
        this._commandFunc = commandFunc;
        this._oldValues = [];
        this._id = mindplot.Command._nextUUID();
    },
    execute: function(commandContext)
    {
        if (!this.applied)
        {
            var topics = commandContext.findTopics(this._selectedObjectsIds);
            topics.forEach(function(topic)
            {
                var oldValue = this._commandFunc(topic, this._value);
                this._oldValues.push(oldValue);
            }.bind(this));
            this.applied = true;
        } else
        {
            throw "Command can not be applied two times in a row.";
        }

    },
    undoExecute: function(commandContext)
    {
       if (this.applied)
        {
            var topics = commandContext.findTopics(this._selectedObjectsIds);
            topics.forEach(function(topic,index)
            {
                this._commandFunc(topic, this._oldValues[index]);

            }.bind(this));

            this.applied = false;
            this._oldValues = [];
        } else
        {
            throw "undo can not be applied.";
        }
    }
});