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/**
 * Copyright (C) 2006  Robin Bygrave
 * 
 * This file is part of Ebean.
 * 
 * Ebean is free software; you can redistribute it and/or modify it 
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *  
 * Ebean is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with Ebean; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA  
 */
package com.avaje.ebeaninternal.server.util;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;

import com.avaje.ebean.bean.BeanCollection;
import com.avaje.ebean.common.BeanList;
import com.avaje.ebean.common.BeanMap;
import com.avaje.ebean.common.BeanSet;
import com.avaje.ebeaninternal.api.SpiQuery;

/**
 * Creates the BeanCollections.
 * 
 * Creates the BeanSet BeanMap and BeanList objects.
 * 
 */
public class BeanCollectionFactory {

	private static class BeanCollectionFactoryHolder {
		private static BeanCollectionFactory me = new BeanCollectionFactory();
	}
	
    private static final int defaultListInitialCapacity = 20;
    private static final int defaultSetInitialCapacity = 32;
    private static final int defaultMapInitialCapacity = 32;

    private BeanCollectionFactory() {

    }

    /**
     * Create a BeanCollection for the given parameters.
     */
    public static BeanCollection create(BeanCollectionParams params) {
        return BeanCollectionFactoryHolder.me.createMany(params);
    }

    
    private BeanCollection createMany(BeanCollectionParams params) {

    	SpiQuery.Type manyType = params.getManyType();
        switch (manyType) {
		case MAP:
			return createMap(params);
		case LIST:
			return createList(params);
		case SET:
			return createSet(params);
			
		default:
			 throw new RuntimeException("Invalid Arg " + manyType);
		}
        
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
	private BeanMap createMap(BeanCollectionParams params) {
        
        return new BeanMap(new LinkedHashMap(defaultMapInitialCapacity));       
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
	private BeanSet createSet(BeanCollectionParams params) {

        return new BeanSet(new LinkedHashSet(defaultSetInitialCapacity));
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
	private BeanList createList(BeanCollectionParams params) {
        
        return new BeanList(new ArrayList(defaultListInitialCapacity));
    }
}