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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.ConstArray;
import com.scudata.array.IArray;
import com.scudata.dm.Context;
import com.scudata.dm.Param;
import com.scudata.dm.ParamList;
import com.scudata.dm.Sequence;
import com.scudata.util.Variant;

/**
 * ?????ڵ㣬ֵ???ɱ??޸?
 * @author RunQian
 *
 */
public class ArgParam extends Node {
	private Param param;

	public ArgParam(Param param) {
		this.param = param;
	}

	protected boolean containParam(String name) {
		return name.equals(param.getName());
	}

	protected void getUsedParams(Context ctx, ParamList resultList) {
		if (resultList.get(param.getName()) == null) {
			resultList.addVariable(param.getName(), param.getValue());
		}
	}
	
	/**
	 * ?Խڵ????Ż???????????ʽ????ɳ???
	 * @param ctx ??????????
	 * @param Node ?Ż???Ľڵ?
	 */
	public Node optimize(Context ctx) {
		return new Constant(calculate(ctx));
	}

	public Object calculate(Context ctx) {
		return param.getValue();
	}

	/**
	 * ??????????еĽ??
	 * @param ctx ??????????
	 * @return IArray
	 */
	public IArray calculateAll(Context ctx) {
		Sequence sequence = ctx.getComputeStack().getTopSequence();
		return new ConstArray(param.getValue(), sequence.length());
	}
	
	/**
	 * ????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) {
		Object value = param.getValue();
		BoolArray result = leftResult.isTrue();
		
		if (Variant.isFalse(value)) {
			int size = result.size();
			for (int i = 1; i <= size; ++i) {
				result.set(i, false);
			}
		}
		
		return result;
	}

	/**
	 * ???ؽڵ??Ƿ񵥵???????
	 * @return true???ǵ????????ģ?false??????
	 */
	public boolean isMonotone() {
		return true;
	}
}