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SingletonUtil

Kind of class:	public class
Package:	org.casalib.util
Inherits from:	none
Version:	01/19/09
Author:	Aaron Clinger
Classpath:	org.casalib.util.SingletonUtil
File last modified:	Sunday, 28 March 2010, 11:55:55

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/*
    CASA Framework for ActionScript 3.0
    Copyright (c) 2010, Contributors of CASA Framework
    All rights reserved.
    
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:
    
    - Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    
    - Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    
    - Neither the name of the CASA Framework nor the names of its contributors
      may be used to endorse or promote products derived from this software
      without specific prior written permission.
    
    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.
*/
package org.casalib.util {
    import flash.utils.Dictionary;
    
    
    /**
        Provides utility functions for creating and managing singletons.
        
        @author Aaron Clinger
        @version 01/19/09
    */
    public class SingletonUtil {
        protected static var _singletonMap:Dictionary;
        
        
        /**
            Creates a singleton out of a class without adapting or extending the class itself.
            
            @param type: The class you want a to created a singleton from.
            @return The singleton instance of the class.
            @example
                <code>
                    var stopwatch:Stopwatch = SingletonUtil.singleton(Stopwatch);
                    stopwatch.start();
                </code>
        */
        public static function singleton(type:Class):* {
            if (SingletonUtil._singletonMap == null)
                SingletonUtil._singletonMap = new Dictionary();
            
            return type in SingletonUtil._singletonMap ? SingletonUtil._singletonMap[type] : SingletonUtil._singletonMap[type] = new type();
        }
    }
}

Provides utility functions for creating and managing singletons.

Summary

Class methods

singleton (type:Class) : *
- Creates a singleton out of a class without adapting or extending the class itself.

Class methods

singleton

public static function singleton (

type:Class) : *

Creates a singleton out of a class without adapting or extending the class itself.

Parameters:

type:

The class you want a to created a singleton from.

Returns:

The singleton instance of the class.

Example:

var stopwatch:Stopwatch = SingletonUtil.singleton(Stopwatch);
stopwatch.start();