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A 2D java physics engine, a port of the C++ Box2d engine. This is the core physics engine.

There is a newer version: 2.2.1.1

/*******************************************************************************
 * Copyright (c) 2011, Daniel Murphy
 * 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.
 * 
 * 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 HOLDER 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.jbox2d.pooling.arrays;

import java.util.HashMap;

import org.jbox2d.common.Vec2;

/**
 * not thread safe Vec2[] pool
 * @author dmurph
 *
 */
public class Vec2Array {

	private final HashMap map = new HashMap();
	
	public Vec2[] get( int argLength){
		assert(argLength > 0);
		
		if(!map.containsKey(argLength)){
			map.put(argLength, getInitializedArray(argLength));
		}
		
		assert(map.get(argLength).length == argLength) : "Array not built of correct length";
		return map.get(argLength);
	}
	
	protected Vec2[] getInitializedArray(int argLength){
		final Vec2[] ray = new Vec2[argLength];
		for (int i = 0; i < ray.length; i++) {
			ray[i] = new Vec2();
		}
		return ray;
	}
}