World Recursion.java

	/**
	 * It goes to touching block. If the cond function returns true on that block, 
	 * it goes on and operates on the values of that block using the op function. 
	 * It then executes itself with that block as the base.
	 * To make a generic TreeCapitator, cond should be 
	 * <code>return wrd.getBlockId(x, y, z) == Block.wood.blockID || wrd.getBlockId(x, y, z) == Block.leaves.blockID</code>
	 * op should be
	 * <code>wrd.destroyBlock(x, y, z, true)</code>
	 * 
	 * For more information see the wikipedia page on recursion, especially Multiple Recursion
	 */	
	public void iterateTouching(int x, int y, int z, World wrd) {
		if (cond(x + 1, y, z,world)) {
			op(x + 1, y, z,world)
			iterateTouching(x + 1, y, z,world)
		}
		if (cond(x - 1, y, z,world)) {
			op(x - 1, y, z,world)
			iterateTouching(x - 1, y, z,world)
		}
		if (cond(x, y + 1, z,world)) {
			op(x, y + 1, z,world)
			iterateTouching(x, y + 1, z,world)
		}
		if (cond(x, y - 1, z,world)) {
			op(x, y - 1, z,world)
			iterateTouching(x, y - 1, z,world)
		}
		if (cond(x, y, z + 1,world)) {
			op(x, y, z + 1,world)
			iterateTouching(x, y, z + 1, world)
		}
		if (cond(x, y, z - 1,world)) {
			op(x, y, z - 1,world)
			iterateTouching(x, y, z - 1, world)
		}
	}
	
	private boolean cond(int x,int y,int z,World world){...}
	
	private void op(int x, int y, int z, World world){...}