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SPL(Structured Process Language) A programming language specially for structured data computing.

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package com.scudata.expression;

import com.scudata.array.BoolArray;
import com.scudata.array.IArray;
import com.scudata.array.IntArray;
import com.scudata.dm.ComputeStack;
import com.scudata.dm.Context;
import com.scudata.dm.Sequence;

/**
 * ??ǰ??ѭ?????
 * #@
 * @author RunQian
 *
 */
public class CurrentCellSeq extends Node {
	private int seq = 0;
	
	public Object calculate(Context ctx) {
		return ++seq;
	}
	
	/**
	 * ????signArray??ȡֵΪsign????
	 * @param ctx
	 * @param signArray ?б?ʶ????
	 * @param sign ??ʶ
	 * @return IArray
	 */
	public IArray calculateAll(Context ctx, IArray signArray, boolean sign) {
		return calculateAll(ctx);
	}
	
	/**
	 * ?????߼????????&&???Ҳ????ʽ
	 * @param ctx ??????????
	 * @param leftResult &&??????ʽ?ļ?????
	 * @return BoolArray
	 */
	public BoolArray calculateAnd(Context ctx, IArray leftResult) {
		return leftResult.isTrue();
	}

	/**
	 * ??????????еĽ??
	 * @param ctx ??????????
	 * @return IArray
	 */
	public IArray calculateAll(Context ctx) {
		ComputeStack stack = ctx.getComputeStack();
		Sequence topSequence = stack.getTopSequence();
		int start = seq + 1;
		seq += topSequence.length();
		IntArray array = new IntArray(start, seq);
		array.setTemporary(true);
		return array;
	}
	
	/**
	 * ???ؽڵ??Ƿ񵥵???????
	 * @return true???ǵ????????ģ?false??????
	 */
	public boolean isMonotone() {
		return true;
	}
}