package treeNAlgo;

import treeN.*;

/**
 * Splits host upwards if its state > order and passes the host to the
 * supplied param, which is an ISpliceCmd, to do some "abstract splicing".
 * @dependency treeNAlgo.ILambda uses
 */
class SplitUpAndSplice implements ITreeNAlgo {

    int order;
    /**
     * Installs no-op cmd for states <= order
     */
    public SplitUpAndSplice(int order) {
	this.order = order;
    }

    public Object caseAt(int i, final TreeN host, final Object param) {
	if(i<=order) {
	    return host;
	}
	else {
	    host.splitUpAt((i - dither()) / 2);   // push data up
	    return ((ILambda)param).apply(host); // "splice" host into something!
	}
    }

    private final int dither() {
	return (int)(2 * Math.random());
    }
}