EntityComponentSystem.m

/**
 * Based on Artemis Entity System Framework
 * 
 * Copyright 2011 GAMADU.COM. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are
 * permitted provided that the following conditions are met:
 * 
 *    1. Redistributions of source code must retain the above copyright notice, this list of
 *       conditions and the following disclaimer.
 * 
 *    2. 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.
 * 
 * THIS SOFTWARE IS PROVIDED BY GAMADU.COM ``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 GAMADU.COM 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.
 * 
 * The views and conclusions contained in the software and documentation are those of the
 * authors and should not be interpreted as representing official policies, either expressed
 * or implied, of GAMADU.COM.
 */

#import "EntityComponentSystem.h"
#import "Component.h"
#import "Entity.h"

@implementation EntityComponentSystem

-(id) initWithUsedComponentClasses:(NSArray *)usedComponentClasses
{
    if (self = [super init])
    {
        _usedComponentClasses = [usedComponentClasses retain];
    }
    return self;
}

-(id) initWithUsedComponentClass:(Class)usedComponentClass
{
	return [self initWithUsedComponentClasses:[NSArray arrayWithObject:usedComponentClass]];
}

-(id) init
{
    return [self initWithUsedComponentClasses:[NSArray array]];
}

-(void) dealloc
{
    [_usedComponentClasses release];
    
    [super dealloc];
}

-(BOOL) shouldContainEntity:(Entity *)entity
{
    if ([_usedComponentClasses count] == 0)
    {
        return FALSE;
    }
    else
    {
        BOOL hasAllUsedComponents = TRUE;
        for (Class usedComponentClass in _usedComponentClasses)
        {
            Component *component = [entity getComponent:usedComponentClass];
            if (component == nil || ![component enabled])
            {
                hasAllUsedComponents = FALSE;
                break;
            }
        }
        return hasAllUsedComponents;
    }
}

@end